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Genome

In the fields of molecular biology and genetics, a genome is all the genetic information of an organism.[1] It consists of nucleotide sequences of DNA (or RNA in RNA viruses). The nuclear genome includes protein-coding genes and non-coding genes, other functional regions of the genome such as regulatory sequences (see non-coding DNA), and often a substantial fraction of 'junk' DNA with no evident function.[2][3] Almost all eukaryotes have mitochondria and a small mitochondrial genome.[2] Algae and plants also contain chloroplasts with a chloroplast genome.

A label diagram explaining the different parts of a prokaryotic genome

An image of the 46 chromosomes making up the diploid genome of a human male. (The mitochondrial chromosome is not shown.)

The study of the genome is called genomics. The genomes of many organisms have been sequenced and various regions have been annotated. The International Human Genome Project reported the sequence of the genome for Homo sapiens in 2004 The Human Genome Project, although the initial "finished" sequence was missing 8% of the genome consisting mostly of repetitive sequences.

With advancements in technology that could handle sequencing of the many repetitive sequences found in human DNA that were not fully uncovered by the original Human Genome Project study, scientists reported the first end-to-end human genome sequence in March, 2022.[4]

Origin of term

The term genome was created in 1920 by Hans Winkler,[5] professor of botany at the University of Hamburg, Germany. The website Oxford Dictionaries and the Online Etymology Dictionary suggest the name is a blend of the words gene and chromosome.[6][7][8][9] However, see omics for a more thorough discussion. A few related -ome words already existed, such as biome and rhizome, forming a vocabulary into which genome fits systematically.[10]


Definition

It's very difficult to come up with a precise definition of "genome." It usually refers to the DNA (or sometimes RNA) molecules that carry the genetic information in an organism but sometimes it is difficult to decide which molecules to include in the definition; for example, bacteria usually have one or two large DNA molecules (chromosomes) that contain all of the essential genetic material but they also contain smaller extrachromosomal plasmid molecules that carry important genetic information. The definition of 'genome' that's commonly used in the scientific literature is usually restricted to the large chromosomal DNA molecules in bacteria.[11]

Eukaryotic genomes are even more difficult to define because almost all eukaryotic species contain nuclear chromosomes plus extra DNA molecules in the mitochondria. In addition, algae and plants have chloroplast DNA. Most textbooks make a distinction between the nuclear genome and the organelle (mitochondria and chloroplast) genomes so when they speak of, say, the human genome, they are only referring to the genetic material in the nucleus.[2][12] This is the most common use of 'genome' in the scientific literature.

Most eukaryotes are diploid, meaning that there are two copies of each chromosome in the nucleus but the 'genome' refers to only one copy of each chromosome. Some eukaryotes have distinctive sex chromosomes such as the X and Y chromosomes of mammals so the technical definition of the genome must include both copies of the sex chromosomes. When referring to the standard reference genome of humans, for example, it consists of one copy of each of the 22 autosomes plus one X chromosome and one Y chromosome.[13]

Sequencing and mapping

A genome sequence is the complete list of the nucleotides (A, C, G, and T for DNA genomes) that make up all the chromosomes of an individual or a species. Within a species, the vast majority of nucleotides are identical between individuals, but sequencing multiple individuals is necessary to understand the genetic diversity.

 
Part of DNA sequence – prototypification of complete genome of virus

In 1976, Walter Fiers at the University of Ghent (Belgium) was the first to establish the complete nucleotide sequence of a viral RNA-genome (Bacteriophage MS2). The next year, Fred Sanger completed the first DNA-genome sequence: Phage Φ-X174, of 5386 base pairs.[14] The first bacterial genome to be sequenced was that of Haemophilus influenzae, completed by a team at The Institute for Genomic Research in 1995. A few months later, the first eukaryotic genome was completed, with sequences of the 16 chromosomes of budding yeast Saccharomyces cerevisiae published as the result of a European-led effort begun in the mid-1980s. The first genome sequence for an archaeon, Methanococcus jannaschii, was completed in 1996, again by The Institute for Genomic Research.[citation needed]

The development of new technologies has made genome sequencing dramatically cheaper and easier, and the number of complete genome sequences is growing rapidly. The US National Institutes of Health maintains one of several comprehensive databases of genomic information.[15] Among the thousands of completed genome sequencing projects include those for rice, a mouse, the plant Arabidopsis thaliana, the puffer fish, and the bacteria E. coli. In December 2013, scientists first sequenced the entire genome of a Neanderthal, an extinct species of humans. The genome was extracted from the toe bone of a 130,000-year-old Neanderthal found in a Siberian cave.[16][17]

New sequencing technologies, such as massive parallel sequencing have also opened up the prospect of personal genome sequencing as a diagnostic tool, as pioneered by Manteia Predictive Medicine. A major step toward that goal was the completion in 2007 of the full genome of James D. Watson, one of the co-discoverers of the structure of DNA.[18]

Whereas a genome sequence lists the order of every DNA base in a genome, a genome map identifies the landmarks. A genome map is less detailed than a genome sequence and aids in navigating around the genome. The Human Genome Project was organized to map and to sequence the human genome. A fundamental step in the project was the release of a detailed genomic map by Jean Weissenbach and his team at the Genoscope in Paris.[19][20]

Reference genome sequences and maps continue to be updated, removing errors and clarifying regions of high allelic complexity.[21] The decreasing cost of genomic mapping has permitted genealogical sites to offer it as a service,[22] to the extent that one may submit one's genome to crowdsourced scientific endeavours such as DNA.LAND at the New York Genome Center,[23] an example both of the economies of scale and of citizen science.[24]

Viral genomes

Viral genomes can be composed of either RNA or DNA. The genomes of RNA viruses can be either single-stranded RNA or double-stranded RNA, and may contain one or more separate RNA molecules (segments: monopartit or multipartit genome). DNA viruses can have either single-stranded or double-stranded genomes. Most DNA virus genomes are composed of a single, linear molecule of DNA, but some are made up of a circular DNA molecule.[25]

Prokaryotic genomes

Prokaryotes and eukaryotes have DNA genomes. Archaea and most bacteria have a single circular chromosome,[26] however, some bacterial species have linear or multiple chromosomes.[27][28] If the DNA is replicated faster than the bacterial cells divide, multiple copies of the chromosome can be present in a single cell, and if the cells divide faster than the DNA can be replicated, multiple replication of the chromosome is initiated before the division occurs, allowing daughter cells to inherit complete genomes and already partially replicated chromosomes. Most prokaryotes have very little repetitive DNA in their genomes.[29] However, some symbiotic bacteria (e.g. Serratia symbiotica) have reduced genomes and a high fraction of pseudogenes: only ~40% of their DNA encodes proteins.[30][31]

Some bacteria have auxiliary genetic material, also part of their genome, which is carried in plasmids. For this, the word genome should not be used as a synonym of chromosome.

Eukaryotic genomes

 
In a typical human cell, the genome is contained in 22 pairs of autosomes, two sex chromosomes (the female and male variants shown at bottom right), as well as the mitochondrial genome (shown to scale as "MT" at bottom left).

Eukaryotic genomes are composed of one or more linear DNA chromosomes. The number of chromosomes varies widely from Jack jumper ants and an asexual nemotode,[32] which each have only one pair, to a fern species that has 720 pairs.[33] It is surprising the amount of DNA that eukaryotic genomes contain compared to other genomes. The amount is even more than what is necessary for DNA protein-coding and noncoding genes due to the fact that eukaryotic genomes show as much as 64,000-fold variation in their sizes.[34] However, this special characteristic is caused by the presence of repetitive DNA, and transposable elements (TEs).

A typical human cell has two copies of each of 22 autosomes, one inherited from each parent, plus two sex chromosomes, making it diploid. Gametes, such as ova, sperm, spores, and pollen, are haploid, meaning they carry only one copy of each chromosome. In addition to the chromosomes in the nucleus, organelles such as the chloroplasts and mitochondria have their own DNA. Mitochondria are sometimes said to have their own genome often referred to as the "mitochondrial genome". The DNA found within the chloroplast may be referred to as the "plastome". Like the bacteria they originated from, mitochondria and chloroplasts have a circular chromosome.

Unlike prokaryotes where exon-intron organization of protein coding genes exists but is rather exceptional, eukaryotes generally have these features in their genes and their genomes contain variable amounts of repetitive DNA. In mammals and plants, the majority of the genome is composed of repetitive DNA.[35] Genes in eukaryotic genomes can be annotated using FINDER.[36][37]

DNA sequencing

High-throughput technology makes sequencing to assemble new genomes accessible to everyone. Sequence polymorphisms are typically discovered by comparing resequenced isolates to a reference, whereas analyses of coverage depth and mapping topology can provide details regarding structural variations such as chromosomal translocations and segmental duplications.

Coding sequences

DNA sequences that carry the instructions to make proteins are referred to as coding sequences. The proportion of the genome occupied by coding sequences varies widely. A larger genome does not necessarily contain more genes, and the proportion of non-repetitive DNA decreases along with increasing genome size in complex eukaryotes.[35]

 
Composition of the human genome

Noncoding sequences

Noncoding sequences include introns, sequences for non-coding RNAs, regulatory regions, and repetitive DNA. Noncoding sequences make up 98% of the human genome. There are two categories of repetitive DNA in the genome: tandem repeats and interspersed repeats.[38]

Tandem repeats

Short, non-coding sequences that are repeated head-to-tail are called tandem repeats. Microsatellites consisting of 2-5 basepair repeats, while minisatellite repeats are 30-35 bp. Tandem repeats make up about 4% of the human genome and 9% of the fruit fly genome.[39] Tandem repeats can be functional. For example, telomeres are composed of the tandem repeat TTAGGG in mammals, and they play an important role in protecting the ends of the chromosome.

In other cases, expansions in the number of tandem repeats in exons or introns can cause disease.[40] For example, the human gene huntingtin (Htt) typically contains 6–29 tandem repeats of the nucleotides CAG (encoding a polyglutamine tract). An expansion to over 36 repeats results in Huntington's disease, a neurodegenerative disease. Twenty human disorders are known to result from similar tandem repeat expansions in various genes. The mechanism by which proteins with expanded polygulatamine tracts cause death of neurons is not fully understood. One possibility is that the proteins fail to fold properly and avoid degradation, instead accumulating in aggregates that also sequester important transcription factors, thereby altering gene expression.[40]

Tandem repeats are usually caused by slippage during replication, unequal crossing-over and gene conversion.[41]

Transposable elements

Transposable elements (TEs) are sequences of DNA with a defined structure that are able to change their location in the genome.[39][29][42] TEs are categorized as either as a mechanism that replicates by copy-and-paste or as a mechanism that can be excised from the genome and inserted at a new location. In the human genome, there are three important classes of TEs that make up more than 45% of the human DNA; these classes are The long interspersed nuclear elements (LINEs), The interspersed nuclear elements (SINEs), and endogenous retroviruses. These elements have a big potential to modify the genetic control in a host organism.[34]

The movement of TEs is a driving force of genome evolution in eukaryotes because their insertion can disrupt gene functions, homologous recombination between TEs can produce duplications, and TE can shuffle exons and regulatory sequences to new locations.[43]

Retrotransposons

Retrotransposons[44] are found mostly in eukaryotes but not found in prokaryotes and retrotransposons form a large portion of genomes of many eukaryotes. Retrotransposon is a transposable element that transpose through an RNA intermediate. Retrotransposons[45] are composed of DNA, but are transcribed into RNA for transposition, then the RNA transcript is copied back to DNA formation with the help of a specific enzyme called reverse transcriptase. Retrotransposons that carry reverse transcriptase in their gene can trigger its own transposition but the genes that lack the reverse transcriptase must use reverse transcriptase synthesized by another retrotransposon. Retrotransposons can be transcribed into RNA, which are then duplicated at another site into the genome.[46] Retrotransposons can be divided into long terminal repeats (LTRs) and non-long terminal repeats (Non-LTRs).[43]

Long terminal repeats (LTRs) are derived from ancient retroviral infections, so they encode proteins related to retroviral proteins including gag (structural proteins of the virus), pol (reverse transcriptase and integrase), pro (protease), and in some cases env (envelope) genes.[42] These genes are flanked by long repeats at both 5' and 3' ends. It has been reported that LTRs consist of the largest fraction in most plant genome and might account for the huge variation in genome size.[47]

Non-long terminal repeats (Non-LTRs) are classified as long interspersed nuclear elements (LINEs), short interspersed nuclear elements (SINEs), and Penelope-like elements (PLEs). In Dictyostelium discoideum, there is another DIRS-like elements belong to Non-LTRs. Non-LTRs are widely spread in eukaryotic genomes.[48]

Long interspersed elements (LINEs) encode genes for reverse transcriptase and endonuclease, making them autonomous transposable elements. The human genome has around 500,000 LINEs, taking around 17% of the genome.[49]

Short interspersed elements (SINEs) are usually less than 500 base pairs and are non-autonomous, so they rely on the proteins encoded by LINEs for transposition.[50] The Alu element is the most common SINE found in primates. It is about 350 base pairs and occupies about 11% of the human genome with around 1,500,000 copies.[43]

DNA transposons

DNA transposons encode a transposase enzyme between inverted terminal repeats. When expressed, the transposase recognizes the terminal inverted repeats that flank the transposon and catalyzes its excision and reinsertion in a new site.[39] This cut-and-paste mechanism typically reinserts transposons near their original location (within 100kb).[43] DNA transposons are found in bacteria and make up 3% of the human genome and 12% of the genome of the roundworm C. elegans.[43]

Genome size

 
Log–log plot of the total number of annotated proteins in genomes submitted to GenBank as a function of genome size

Genome size is the total number of the DNA base pairs in one copy of a haploid genome. Genome size varies widely across species. Invertebrates have small genomes, this is also correlated to a small number of transposable elements. Fish and Amphibians have intermediate-size genomes, and birds have relatively small genomes but it has been suggested that birds lost a substantial portion of their genomes during the phase of transition to flight.  Before this loss, DNA methylation allows the adequate expansion of the genome.[34]

In humans, the nuclear genome comprises approximately 3.1 billion nucleotides of DNA, divided into 24 linear molecules, the shortest 45 000 000 nucleotides in length and the longest 248 000 000 nucleotides, each contained in a different chromosome.[51] There is no clear and consistent correlation between morphological complexity and genome size in either prokaryotes or lower eukaryotes.[35][52] Genome size is largely a function of the expansion and contraction of repetitive DNA elements.

Since genomes are very complex, one research strategy is to reduce the number of genes in a genome to the bare minimum and still have the organism in question survive. There is experimental work being done on minimal genomes for single cell organisms as well as minimal genomes for multi-cellular organisms (see developmental biology). The work is both in vivo and in silico.[53][54]

Genome size differences due to transposable elements

 
Comparison among genome sizes

There are many enormous differences in size in genomes, specially mentioned before in the multicellular eukaryotic genomes. Much of this is due to the differing abundances of transposable elements, which evolve by creating new copies of themselves in the chromosomes.[34] Eukaryote genomes often contain many thousands of copies of these elements, most of which have acquired mutations that make them defective. Here is a table of some significant or representative genomes. See #See also for lists of sequenced genomes.

Organism type Organism Genome size
(base pairs)
Approx. no. of genes Note
Virus Porcine circovirus type 1 1,759 1.8 kB Smallest viruses replicating autonomously in eukaryotic cells[55]
Virus Bacteriophage MS2 3,569 3.6 kB First sequenced RNA-genome[56]
Virus SV40 5,224 5.2 kB [57]
Virus Phage Φ-X174 5,386 5.4 kB First sequenced DNA-genome[58]
Virus HIV 9,749 9.7 kB [59]
Virus Phage λ 48,502 48.5 kB Often used as a vector for the cloning of recombinant DNA

[60][61][62]

Virus Megavirus 1,259,197 1.3 MB Until 2013 the largest known viral genome[63]
Virus Pandoravirus salinus 2,470,000 2.47 MB Largest known viral genome.[64]
Eukaryotic organelle Human mitochondrion 16,569 16.6 kB [65]
Bacterium Nasuia deltocephalinicola (strain NAS-ALF) 112,091 112 kB 137 Smallest known non-viral genome. Symbiont of leafhoppers.[66]
Bacterium Carsonella ruddii 159,662 160 kB An endosymbiont of psyllid insects
Bacterium Buchnera aphidicola 600,000 600 kB An endosymbiont of aphids[67]
Bacterium Wigglesworthia glossinidia 700,000 700 kB A symbiont in the gut of the tsetse fly
Bacteriumcyanobacterium Prochlorococcus spp. (1.7 Mb) 1,700,000 1.7 MB 1,884 Smallest known cyanobacterium genome. One of the primary photosynthesizers on Earth.[68][69]
Bacterium Haemophilus influenzae 1,830,000 1.8 MB First genome of a living organism sequenced, July 1995[70]
Bacterium Escherichia coli 4,600,000 4.6 MB 4,288 [71]
Bacterium – cyanobacterium Nostoc punctiforme 9,000,000 9 MB 7,432 7432 open reading frames[72]
Bacterium Solibacter usitatus (strain Ellin 6076) 9,970,000 10 MB [73]
Amoeboid Polychaos dubium ("Amoeba" dubia) 670,000,000,000 670 GB Largest known genome.[74] (Disputed)[75]
Plant Genlisea tuberosa 61,000,000 61 MB Smallest recorded flowering plant genome, 2014[76]
Plant Arabidopsis thaliana 135,000,000[77] 135 MB 27,655[78] First plant genome sequenced, December 2000[79]
Plant Populus trichocarpa 480,000,000 480 MB 73,013 First tree genome sequenced, September 2006[80]
Plant Pinus taeda (Loblolly pine) 22,180,000,000 22.18 GB 50,172 Gymnosperms generally have much larger genomes than angiosperms[81][82]
Plant Fritillaria assyriaca 130,000,000,000 130 GB
Plant Paris japonica (Japanese-native, order Liliales) 150,000,000,000 150 GB Largest plant genome known[83]
Plantmoss Physcomitrella patens 480,000,000 480 MB First genome of a bryophyte sequenced, January 2008[84]
Fungusyeast Saccharomyces cerevisiae 12,100,000 12.1 MB 6,294 First eukaryotic genome sequenced, 1996[85]
Fungus Aspergillus nidulans 30,000,000 30 MB 9,541 [86]
Nematode Pratylenchus coffeae 20,000,000 20 MB [87] Smallest animal genome known[88]
Nematode Caenorhabditis elegans 100,300,000 100 MB 19,000 First multicellular animal genome sequenced, December 1998[89]
Insect Belgica antarctica (Antarctic midge) 99,000,000 99 MB Smallest insect genome sequenced thus far, likely an adaptation to an extreme environment[90]
Insect Drosophila melanogaster (fruit fly) 175,000,000 175 MB 13,600 Size variation based on strain (175–180 Mb; standard y w strain is 175 Mb)[91]
Insect Apis mellifera (honey bee) 236,000,000 236 MB 10,157 [92]
Insect Bombyx mori (silk moth) 432,000,000 432 MB 14,623 14,623 predicted genes[93]
Insect Solenopsis invicta (fire ant) 480,000,000 480 MB 16,569 [94]
Crustacean Antarctic krill 48,010,000,000 48 GB 23,000 70-92% repetitive DNA[95]
Amphibian Neuse River waterdog 118,000,000,000 118 GB Largest tetrapod genome sequenced as of 2022[96]
Amphibian Ornate burrowing frog 1,060,000,000 1.06 GB Smallest known frog genome[97]
Mammal Mus musculus 2,700,000,000 2.7 GB 20,210 [98]
Mammal Pan paniscus 3,286,640,000 3.3 GB 20,000 Bonobo – estimated genome size 3.29 billion bp[99]
Mammal Homo sapiens 3,117,000,000 3.1 GB 20,000 Homo sapiens genome size estimated at 3.12 Gbp in 2022[51]

Initial sequencing and analysis of the human genome[100]

Bird Gallus gallus 1,043,000,000 1.0 GB 20,000 [101]
Fish Tetraodon nigroviridis (type of puffer fish) 385,000,000 390 MB Smallest vertebrate genome known, estimated to be 340 Mb[102][103] – 385 Mb[104]
Fish Protopterus aethiopicus (marbled lungfish) 130,000,000,000 130 GB Largest vertebrate genome known

Genomic alterations

All the cells of an organism originate from a single cell, so they are expected to have identical genomes; however, in some cases, differences arise. Both the process of copying DNA during cell division and exposure to environmental mutagens can result in mutations in somatic cells. In some cases, such mutations lead to cancer because they cause cells to divide more quickly and invade surrounding tissues.[105] In certain lymphocytes in the human immune system, V(D)J recombination generates different genomic sequences such that each cell produces a unique antibody or T cell receptors.

During meiosis, diploid cells divide twice to produce haploid germ cells. During this process, recombination results in a reshuffling of the genetic material from homologous chromosomes so each gamete has a unique genome.

Genome-wide reprogramming

Genome-wide reprogramming in mouse primordial germ cells involves epigenetic imprint erasure leading to totipotency. Reprogramming is facilitated by active DNA demethylation, a process that entails the DNA base excision repair pathway.[106] This pathway is employed in the erasure of CpG methylation (5mC) in primordial germ cells. The erasure of 5mC occurs via its conversion to 5-hydroxymethylcytosine (5hmC) driven by high levels of the ten-eleven dioxygenase enzymes TET1 and TET2.[107]

Genome evolution

Genomes are more than the sum of an organism's genes and have traits that may be measured and studied without reference to the details of any particular genes and their products. Researchers compare traits such as karyotype (chromosome number), genome size, gene order, codon usage bias, and GC-content to determine what mechanisms could have produced the great variety of genomes that exist today (for recent overviews, see Brown 2002; Saccone and Pesole 2003; Benfey and Protopapas 2004; Gibson and Muse 2004; Reese 2004; Gregory 2005).

Duplications play a major role in shaping the genome. Duplication may range from extension of short tandem repeats, to duplication of a cluster of genes, and all the way to duplication of entire chromosomes or even entire genomes. Such duplications are probably fundamental to the creation of genetic novelty.

Horizontal gene transfer is invoked to explain how there is often an extreme similarity between small portions of the genomes of two organisms that are otherwise very distantly related. Horizontal gene transfer seems to be common among many microbes. Also, eukaryotic cells seem to have experienced a transfer of some genetic material from their chloroplast and mitochondrial genomes to their nuclear chromosomes. Recent empirical data suggest an important role of viruses and sub-viral RNA-networks to represent a main driving role to generate genetic novelty and natural genome editing.

In fiction

Works of science fiction illustrate concerns about the availability of genome sequences.

Michael Crichton's 1990 novel Jurassic Park and the subsequent film tell the story of a billionaire who creates a theme park of cloned dinosaurs on a remote island, with disastrous outcomes. A geneticist extracts dinosaur DNA from the blood of ancient mosquitoes and fills in the gaps with DNA from modern species to create several species of dinosaurs. A chaos theorist is asked to give his expert opinion on the safety of engineering an ecosystem with the dinosaurs, and he repeatedly warns that the outcomes of the project will be unpredictable and ultimately uncontrollable. These warnings about the perils of using genomic information are a major theme of the book.

The 1997 film Gattaca is set in a futurist society where genomes of children are engineered to contain the most ideal combination of their parents' traits, and metrics such as risk of heart disease and predicted life expectancy are documented for each person based on their genome. People conceived outside of the eugenics program, known as "In-Valids" suffer discrimination and are relegated to menial occupations. The protagonist of the film is an In-Valid who works to defy the supposed genetic odds and achieve his dream of working as a space navigator. The film warns against a future where genomic information fuels prejudice and extreme class differences between those who can and can't afford genetically engineered children.[108]

See also

References

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Further reading

  • Benfey P, Protopapas AD (2004). Essentials of Genomics. Prentice Hall.
  • Brown TA (2002). Genomes 2. Oxford: Bios Scientific Publishers. ISBN 978-1-85996-029-5.
  • Gibson G, Muse SV (2004). A Primer of Genome Science (Second ed.). Sunderland, Mass: Sinauer Assoc. ISBN 978-0-87893-234-4.
  • Gregory TR (2005). The Evolution of the Genome. Elsevier. ISBN 978-0-12-301463-4.
  • Reece RJ (2004). Analysis of Genes and Genomes. Chichester: John Wiley & Sons. ISBN 978-0-470-84379-6.
  • Saccone C, Pesole G (2003). Handbook of Comparative Genomics. Chichester: John Wiley & Sons. ISBN 978-0-471-39128-9.
  • Werner E (December 2003). "In silico multicellular systems biology and minimal genomes". Drug Discovery Today. 8 (24): 1121–27. doi:10.1016/S1359-6446(03)02918-0. PMID 14678738.

External links

  • UCSC Genome Browser – view the genome and annotations for more than 80 organisms.
  • (archived 9 August 2013)
  • (archived 9 June 2010)
  • Some comparative genome sizes
  • DNA Interactive: The History of DNA Science
  • DNA From The Beginning
  • All About The Human Genome Project—from Genome.gov
  • Animal genome size database
  • (archived 1 September 2005)
  • GOLD:Genomes OnLine Database
  • The Genome News Network
  • NCBI Entrez Genome Project database
  • NCBI Genome Primer
  • GeneCards—an integrated database of human genes
  • BBC News – Final genome 'chapter' published
  • IMG (The Integrated Microbial Genomes system)—for genome analysis by the DOE-JGI
  • —next-generation sequencing data analysis for Illumina and 454 Service from GeKnome Technologies (archived 3 March 2012)

genome, technical, introduction, topic, introduction, genetics, other, uses, disambiguation, fields, molecular, biology, genetics, genome, genetic, information, organism, consists, nucleotide, sequences, viruses, nuclear, genome, includes, protein, coding, gen. For a non technical introduction to the topic see Introduction to genetics For other uses see Genome disambiguation In the fields of molecular biology and genetics a genome is all the genetic information of an organism 1 It consists of nucleotide sequences of DNA or RNA in RNA viruses The nuclear genome includes protein coding genes and non coding genes other functional regions of the genome such as regulatory sequences see non coding DNA and often a substantial fraction of junk DNA with no evident function 2 3 Almost all eukaryotes have mitochondria and a small mitochondrial genome 2 Algae and plants also contain chloroplasts with a chloroplast genome A label diagram explaining the different parts of a prokaryotic genome An image of the 46 chromosomes making up the diploid genome of a human male The mitochondrial chromosome is not shown The study of the genome is called genomics The genomes of many organisms have been sequenced and various regions have been annotated The International Human Genome Project reported the sequence of the genome for Homo sapiens in 2004 The Human Genome Project although the initial finished sequence was missing 8 of the genome consisting mostly of repetitive sequences With advancements in technology that could handle sequencing of the many repetitive sequences found in human DNA that were not fully uncovered by the original Human Genome Project study scientists reported the first end to end human genome sequence in March 2022 4 Contents 1 Origin of term 2 Definition 3 Sequencing and mapping 4 Viral genomes 5 Prokaryotic genomes 6 Eukaryotic genomes 6 1 DNA sequencing 6 2 Coding sequences 6 3 Noncoding sequences 6 3 1 Tandem repeats 6 3 2 Transposable elements 6 3 2 1 Retrotransposons 6 3 2 2 DNA transposons 7 Genome size 7 1 Genome size differences due to transposable elements 8 Genomic alterations 8 1 Genome wide reprogramming 9 Genome evolution 10 In fiction 11 See also 12 References 13 Further reading 14 External linksOrigin of term Edit Look up genome in Wiktionary the free dictionary The term genome was created in 1920 by Hans Winkler 5 professor of botany at the University of Hamburg Germany The website Oxford Dictionaries and the Online Etymology Dictionary suggest the name is a blend of the words gene and chromosome 6 7 8 9 However see omics for a more thorough discussion A few related ome words already existed such as biome and rhizome forming a vocabulary into which genome fits systematically 10 Definition EditIt s very difficult to come up with a precise definition of genome It usually refers to the DNA or sometimes RNA molecules that carry the genetic information in an organism but sometimes it is difficult to decide which molecules to include in the definition for example bacteria usually have one or two large DNA molecules chromosomes that contain all of the essential genetic material but they also contain smaller extrachromosomal plasmid molecules that carry important genetic information The definition of genome that s commonly used in the scientific literature is usually restricted to the large chromosomal DNA molecules in bacteria 11 Eukaryotic genomes are even more difficult to define because almost all eukaryotic species contain nuclear chromosomes plus extra DNA molecules in the mitochondria In addition algae and plants have chloroplast DNA Most textbooks make a distinction between the nuclear genome and the organelle mitochondria and chloroplast genomes so when they speak of say the human genome they are only referring to the genetic material in the nucleus 2 12 This is the most common use of genome in the scientific literature Most eukaryotes are diploid meaning that there are two copies of each chromosome in the nucleus but the genome refers to only one copy of each chromosome Some eukaryotes have distinctive sex chromosomes such as the X and Y chromosomes of mammals so the technical definition of the genome must include both copies of the sex chromosomes When referring to the standard reference genome of humans for example it consists of one copy of each of the 22 autosomes plus one X chromosome and one Y chromosome 13 Sequencing and mapping EditFurther information Genome projectA genome sequence is the complete list of the nucleotides A C G and T for DNA genomes that make up all the chromosomes of an individual or a species Within a species the vast majority of nucleotides are identical between individuals but sequencing multiple individuals is necessary to understand the genetic diversity Part of DNA sequence prototypification of complete genome of virus In 1976 Walter Fiers at the University of Ghent Belgium was the first to establish the complete nucleotide sequence of a viral RNA genome Bacteriophage MS2 The next year Fred Sanger completed the first DNA genome sequence Phage F X174 of 5386 base pairs 14 The first bacterial genome to be sequenced was that of Haemophilus influenzae completed by a team at The Institute for Genomic Research in 1995 A few months later the first eukaryotic genome was completed with sequences of the 16 chromosomes of budding yeast Saccharomyces cerevisiae published as the result of a European led effort begun in the mid 1980s The first genome sequence for an archaeon Methanococcus jannaschii was completed in 1996 again by The Institute for Genomic Research citation needed The development of new technologies has made genome sequencing dramatically cheaper and easier and the number of complete genome sequences is growing rapidly The US National Institutes of Health maintains one of several comprehensive databases of genomic information 15 Among the thousands of completed genome sequencing projects include those for rice a mouse the plant Arabidopsis thaliana the puffer fish and the bacteria E coli In December 2013 scientists first sequenced the entire genome of a Neanderthal an extinct species of humans The genome was extracted from the toe bone of a 130 000 year old Neanderthal found in a Siberian cave 16 17 New sequencing technologies such as massive parallel sequencing have also opened up the prospect of personal genome sequencing as a diagnostic tool as pioneered by Manteia Predictive Medicine A major step toward that goal was the completion in 2007 of the full genome of James D Watson one of the co discoverers of the structure of DNA 18 Whereas a genome sequence lists the order of every DNA base in a genome a genome map identifies the landmarks A genome map is less detailed than a genome sequence and aids in navigating around the genome The Human Genome Project was organized to map and to sequence the human genome A fundamental step in the project was the release of a detailed genomic map by Jean Weissenbach and his team at the Genoscope in Paris 19 20 Reference genome sequences and maps continue to be updated removing errors and clarifying regions of high allelic complexity 21 The decreasing cost of genomic mapping has permitted genealogical sites to offer it as a service 22 to the extent that one may submit one s genome to crowdsourced scientific endeavours such as DNA LAND at the New York Genome Center 23 an example both of the economies of scale and of citizen science 24 Viral genomes EditViral genomes can be composed of either RNA or DNA The genomes of RNA viruses can be either single stranded RNA or double stranded RNA and may contain one or more separate RNA molecules segments monopartit or multipartit genome DNA viruses can have either single stranded or double stranded genomes Most DNA virus genomes are composed of a single linear molecule of DNA but some are made up of a circular DNA molecule 25 Prokaryotic genomes EditProkaryotes and eukaryotes have DNA genomes Archaea and most bacteria have a single circular chromosome 26 however some bacterial species have linear or multiple chromosomes 27 28 If the DNA is replicated faster than the bacterial cells divide multiple copies of the chromosome can be present in a single cell and if the cells divide faster than the DNA can be replicated multiple replication of the chromosome is initiated before the division occurs allowing daughter cells to inherit complete genomes and already partially replicated chromosomes Most prokaryotes have very little repetitive DNA in their genomes 29 However some symbiotic bacteria e g Serratia symbiotica have reduced genomes and a high fraction of pseudogenes only 40 of their DNA encodes proteins 30 31 Some bacteria have auxiliary genetic material also part of their genome which is carried in plasmids For this the word genome should not be used as a synonym of chromosome Eukaryotic genomes EditSee also Eukaryotic chromosome fine structure In a typical human cell the genome is contained in 22 pairs of autosomes two sex chromosomes the female and male variants shown at bottom right as well as the mitochondrial genome shown to scale as MT at bottom left Further information Karyotype Eukaryotic genomes are composed of one or more linear DNA chromosomes The number of chromosomes varies widely from Jack jumper ants and an asexual nemotode 32 which each have only one pair to a fern species that has 720 pairs 33 It is surprising the amount of DNA that eukaryotic genomes contain compared to other genomes The amount is even more than what is necessary for DNA protein coding and noncoding genes due to the fact that eukaryotic genomes show as much as 64 000 fold variation in their sizes 34 However this special characteristic is caused by the presence of repetitive DNA and transposable elements TEs A typical human cell has two copies of each of 22 autosomes one inherited from each parent plus two sex chromosomes making it diploid Gametes such as ova sperm spores and pollen are haploid meaning they carry only one copy of each chromosome In addition to the chromosomes in the nucleus organelles such as the chloroplasts and mitochondria have their own DNA Mitochondria are sometimes said to have their own genome often referred to as the mitochondrial genome The DNA found within the chloroplast may be referred to as the plastome Like the bacteria they originated from mitochondria and chloroplasts have a circular chromosome Unlike prokaryotes where exon intron organization of protein coding genes exists but is rather exceptional eukaryotes generally have these features in their genes and their genomes contain variable amounts of repetitive DNA In mammals and plants the majority of the genome is composed of repetitive DNA 35 Genes in eukaryotic genomes can be annotated using FINDER 36 37 DNA sequencing Edit High throughput technology makes sequencing to assemble new genomes accessible to everyone Sequence polymorphisms are typically discovered by comparing resequenced isolates to a reference whereas analyses of coverage depth and mapping topology can provide details regarding structural variations such as chromosomal translocations and segmental duplications Coding sequences EditDNA sequences that carry the instructions to make proteins are referred to as coding sequences The proportion of the genome occupied by coding sequences varies widely A larger genome does not necessarily contain more genes and the proportion of non repetitive DNA decreases along with increasing genome size in complex eukaryotes 35 Composition of the human genome Noncoding sequences Edit Main article Non coding DNA See also Intergenic region Noncoding sequences include introns sequences for non coding RNAs regulatory regions and repetitive DNA Noncoding sequences make up 98 of the human genome There are two categories of repetitive DNA in the genome tandem repeats and interspersed repeats 38 Tandem repeats Edit Short non coding sequences that are repeated head to tail are called tandem repeats Microsatellites consisting of 2 5 basepair repeats while minisatellite repeats are 30 35 bp Tandem repeats make up about 4 of the human genome and 9 of the fruit fly genome 39 Tandem repeats can be functional For example telomeres are composed of the tandem repeat TTAGGG in mammals and they play an important role in protecting the ends of the chromosome In other cases expansions in the number of tandem repeats in exons or introns can cause disease 40 For example the human gene huntingtin Htt typically contains 6 29 tandem repeats of the nucleotides CAG encoding a polyglutamine tract An expansion to over 36 repeats results in Huntington s disease a neurodegenerative disease Twenty human disorders are known to result from similar tandem repeat expansions in various genes The mechanism by which proteins with expanded polygulatamine tracts cause death of neurons is not fully understood One possibility is that the proteins fail to fold properly and avoid degradation instead accumulating in aggregates that also sequester important transcription factors thereby altering gene expression 40 Tandem repeats are usually caused by slippage during replication unequal crossing over and gene conversion 41 Transposable elements Edit Transposable elements TEs are sequences of DNA with a defined structure that are able to change their location in the genome 39 29 42 TEs are categorized as either as a mechanism that replicates by copy and paste or as a mechanism that can be excised from the genome and inserted at a new location In the human genome there are three important classes of TEs that make up more than 45 of the human DNA these classes are The long interspersed nuclear elements LINEs The interspersed nuclear elements SINEs and endogenous retroviruses These elements have a big potential to modify the genetic control in a host organism 34 The movement of TEs is a driving force of genome evolution in eukaryotes because their insertion can disrupt gene functions homologous recombination between TEs can produce duplications and TE can shuffle exons and regulatory sequences to new locations 43 Retrotransposons Edit Retrotransposons 44 are found mostly in eukaryotes but not found in prokaryotes and retrotransposons form a large portion of genomes of many eukaryotes Retrotransposon is a transposable element that transpose through an RNA intermediate Retrotransposons 45 are composed of DNA but are transcribed into RNA for transposition then the RNA transcript is copied back to DNA formation with the help of a specific enzyme called reverse transcriptase Retrotransposons that carry reverse transcriptase in their gene can trigger its own transposition but the genes that lack the reverse transcriptase must use reverse transcriptase synthesized by another retrotransposon Retrotransposons can be transcribed into RNA which are then duplicated at another site into the genome 46 Retrotransposons can be divided into long terminal repeats LTRs and non long terminal repeats Non LTRs 43 Long terminal repeats LTRs are derived from ancient retroviral infections so they encode proteins related to retroviral proteins including gag structural proteins of the virus pol reverse transcriptase and integrase pro protease and in some cases env envelope genes 42 These genes are flanked by long repeats at both 5 and 3 ends It has been reported that LTRs consist of the largest fraction in most plant genome and might account for the huge variation in genome size 47 Non long terminal repeats Non LTRs are classified as long interspersed nuclear elements LINEs short interspersed nuclear elements SINEs and Penelope like elements PLEs In Dictyostelium discoideum there is another DIRS like elements belong to Non LTRs Non LTRs are widely spread in eukaryotic genomes 48 Long interspersed elements LINEs encode genes for reverse transcriptase and endonuclease making them autonomous transposable elements The human genome has around 500 000 LINEs taking around 17 of the genome 49 Short interspersed elements SINEs are usually less than 500 base pairs and are non autonomous so they rely on the proteins encoded by LINEs for transposition 50 The Alu element is the most common SINE found in primates It is about 350 base pairs and occupies about 11 of the human genome with around 1 500 000 copies 43 DNA transposons Edit DNA transposons encode a transposase enzyme between inverted terminal repeats When expressed the transposase recognizes the terminal inverted repeats that flank the transposon and catalyzes its excision and reinsertion in a new site 39 This cut and paste mechanism typically reinserts transposons near their original location within 100kb 43 DNA transposons are found in bacteria and make up 3 of the human genome and 12 of the genome of the roundworm C elegans 43 Genome size Edit Log log plot of the total number of annotated proteins in genomes submitted to GenBank as a function of genome size Genome size is the total number of the DNA base pairs in one copy of a haploid genome Genome size varies widely across species Invertebrates have small genomes this is also correlated to a small number of transposable elements Fish and Amphibians have intermediate size genomes and birds have relatively small genomes but it has been suggested that birds lost a substantial portion of their genomes during the phase of transition to flight Before this loss DNA methylation allows the adequate expansion of the genome 34 In humans the nuclear genome comprises approximately 3 1 billion nucleotides of DNA divided into 24 linear molecules the shortest 45 000 000 nucleotides in length and the longest 248 000 000 nucleotides each contained in a different chromosome 51 There is no clear and consistent correlation between morphological complexity and genome size in either prokaryotes or lower eukaryotes 35 52 Genome size is largely a function of the expansion and contraction of repetitive DNA elements Since genomes are very complex one research strategy is to reduce the number of genes in a genome to the bare minimum and still have the organism in question survive There is experimental work being done on minimal genomes for single cell organisms as well as minimal genomes for multi cellular organisms see developmental biology The work is both in vivo and in silico 53 54 Genome size differences due to transposable elements Edit Comparison among genome sizes There are many enormous differences in size in genomes specially mentioned before in the multicellular eukaryotic genomes Much of this is due to the differing abundances of transposable elements which evolve by creating new copies of themselves in the chromosomes 34 Eukaryote genomes often contain many thousands of copies of these elements most of which have acquired mutations that make them defective Here is a table of some significant or representative genomes See See also for lists of sequenced genomes Organism type Organism Genome size base pairs Approx no of genes NoteVirus Porcine circovirus type 1 1 759 1 8 kB Smallest viruses replicating autonomously in eukaryotic cells 55 Virus Bacteriophage MS2 3 569 3 6 kB First sequenced RNA genome 56 Virus SV40 5 224 5 2 kB 57 Virus Phage F X174 5 386 5 4 kB First sequenced DNA genome 58 Virus HIV 9 749 9 7 kB 59 Virus Phage l 48 502 48 5 kB Often used as a vector for the cloning of recombinant DNA 60 61 62 Virus Megavirus 1 259 197 1 3 MB Until 2013 the largest known viral genome 63 Virus Pandoravirus salinus 2 470 000 2 47 MB Largest known viral genome 64 Eukaryotic organelle Human mitochondrion 16 569 16 6 kB 65 Bacterium Nasuia deltocephalinicola strain NAS ALF 112 091 112 kB 137 Smallest known non viral genome Symbiont of leafhoppers 66 Bacterium Carsonella ruddii 159 662 160 kB An endosymbiont of psyllid insectsBacterium Buchnera aphidicola 600 000 600 kB An endosymbiont of aphids 67 Bacterium Wigglesworthia glossinidia 700 000 700 kB A symbiont in the gut of the tsetse flyBacterium cyanobacterium Prochlorococcus spp 1 7 Mb 1 700 000 1 7 MB 1 884 Smallest known cyanobacterium genome One of the primary photosynthesizers on Earth 68 69 Bacterium Haemophilus influenzae 1 830 000 1 8 MB First genome of a living organism sequenced July 1995 70 Bacterium Escherichia coli 4 600 000 4 6 MB 4 288 71 Bacterium cyanobacterium Nostoc punctiforme 9 000 000 9 MB 7 432 7432 open reading frames 72 Bacterium Solibacter usitatus strain Ellin 6076 9 970 000 10 MB 73 Amoeboid Polychaos dubium Amoeba dubia 670 000 000 000 670 GB Largest known genome 74 Disputed 75 Plant Genlisea tuberosa 61 000 000 61 MB Smallest recorded flowering plant genome 2014 76 Plant Arabidopsis thaliana 135 000 000 77 135 MB 27 655 78 First plant genome sequenced December 2000 79 Plant Populus trichocarpa 480 000 000 480 MB 73 013 First tree genome sequenced September 2006 80 Plant Pinus taeda Loblolly pine 22 180 000 000 22 18 GB 50 172 Gymnosperms generally have much larger genomes than angiosperms 81 82 Plant Fritillaria assyriaca 130 000 000 000 130 GBPlant Paris japonica Japanese native order Liliales 150 000 000 000 150 GB Largest plant genome known 83 Plant moss Physcomitrella patens 480 000 000 480 MB First genome of a bryophyte sequenced January 2008 84 Fungus yeast Saccharomyces cerevisiae 12 100 000 12 1 MB 6 294 First eukaryotic genome sequenced 1996 85 Fungus Aspergillus nidulans 30 000 000 30 MB 9 541 86 Nematode Pratylenchus coffeae 20 000 000 20 MB 87 Smallest animal genome known 88 Nematode Caenorhabditis elegans 100 300 000 100 MB 19 000 First multicellular animal genome sequenced December 1998 89 Insect Belgica antarctica Antarctic midge 99 000 000 99 MB Smallest insect genome sequenced thus far likely an adaptation to an extreme environment 90 Insect Drosophila melanogaster fruit fly 175 000 000 175 MB 13 600 Size variation based on strain 175 180 Mb standard y w strain is 175 Mb 91 Insect Apis mellifera honey bee 236 000 000 236 MB 10 157 92 Insect Bombyx mori silk moth 432 000 000 432 MB 14 623 14 623 predicted genes 93 Insect Solenopsis invicta fire ant 480 000 000 480 MB 16 569 94 Crustacean Antarctic krill 48 010 000 000 48 GB 23 000 70 92 repetitive DNA 95 Amphibian Neuse River waterdog 118 000 000 000 118 GB Largest tetrapod genome sequenced as of 2022 96 Amphibian Ornate burrowing frog 1 060 000 000 1 06 GB Smallest known frog genome 97 Mammal Mus musculus 2 700 000 000 2 7 GB 20 210 98 Mammal Pan paniscus 3 286 640 000 3 3 GB 20 000 Bonobo estimated genome size 3 29 billion bp 99 Mammal Homo sapiens 3 117 000 000 3 1 GB 20 000 Homo sapiens genome size estimated at 3 12 Gbp in 2022 51 Initial sequencing and analysis of the human genome 100 Bird Gallus gallus 1 043 000 000 1 0 GB 20 000 101 Fish Tetraodon nigroviridis type of puffer fish 385 000 000 390 MB Smallest vertebrate genome known estimated to be 340 Mb 102 103 385 Mb 104 Fish Protopterus aethiopicus marbled lungfish 130 000 000 000 130 GB Largest vertebrate genome knownGenomic alterations EditAll the cells of an organism originate from a single cell so they are expected to have identical genomes however in some cases differences arise Both the process of copying DNA during cell division and exposure to environmental mutagens can result in mutations in somatic cells In some cases such mutations lead to cancer because they cause cells to divide more quickly and invade surrounding tissues 105 In certain lymphocytes in the human immune system V D J recombination generates different genomic sequences such that each cell produces a unique antibody or T cell receptors During meiosis diploid cells divide twice to produce haploid germ cells During this process recombination results in a reshuffling of the genetic material from homologous chromosomes so each gamete has a unique genome Genome wide reprogramming Edit Genome wide reprogramming in mouse primordial germ cells involves epigenetic imprint erasure leading to totipotency Reprogramming is facilitated by active DNA demethylation a process that entails the DNA base excision repair pathway 106 This pathway is employed in the erasure of CpG methylation 5mC in primordial germ cells The erasure of 5mC occurs via its conversion to 5 hydroxymethylcytosine 5hmC driven by high levels of the ten eleven dioxygenase enzymes TET1 and TET2 107 Genome evolution EditGenomes are more than the sum of an organism s genes and have traits that may be measured and studied without reference to the details of any particular genes and their products Researchers compare traits such as karyotype chromosome number genome size gene order codon usage bias and GC content to determine what mechanisms could have produced the great variety of genomes that exist today for recent overviews see Brown 2002 Saccone and Pesole 2003 Benfey and Protopapas 2004 Gibson and Muse 2004 Reese 2004 Gregory 2005 Duplications play a major role in shaping the genome Duplication may range from extension of short tandem repeats to duplication of a cluster of genes and all the way to duplication of entire chromosomes or even entire genomes Such duplications are probably fundamental to the creation of genetic novelty Horizontal gene transfer is invoked to explain how there is often an extreme similarity between small portions of the genomes of two organisms that are otherwise very distantly related Horizontal gene transfer seems to be common among many microbes Also eukaryotic cells seem to have experienced a transfer of some genetic material from their chloroplast and mitochondrial genomes to their nuclear chromosomes Recent empirical data suggest an important role of viruses and sub viral RNA networks to represent a main driving role to generate genetic novelty and natural genome editing In fiction EditWorks of science fiction illustrate concerns about the availability of genome sequences Michael Crichton s 1990 novel Jurassic Park and the subsequent film tell the story of a billionaire who creates a theme park of cloned dinosaurs on a remote island with disastrous outcomes A geneticist extracts dinosaur DNA from the blood of ancient mosquitoes and fills in the gaps with DNA from modern species to create several species of dinosaurs A chaos theorist is asked to give his expert opinion on the safety of engineering an ecosystem with the dinosaurs and he repeatedly warns that the outcomes of the project will be unpredictable and ultimately uncontrollable These warnings about the perils of using genomic information are a major theme of the book The 1997 film Gattaca is set in a futurist society where genomes of children are engineered to contain the most ideal combination of their parents traits and metrics such as risk of heart disease and predicted life expectancy are documented for each person based on their genome People conceived outside of the eugenics program known as In Valids suffer discrimination and are relegated to menial occupations The protagonist of the film is an In Valid who works to defy the supposed genetic odds and achieve his dream of working as a space navigator The film warns against a future where genomic information fuels prejudice and extreme class differences between those who can and can t afford genetically engineered children 108 See also EditBacterial genome size Cryoconservation of animal genetic resources Genome Browser Genome Compiler Genome topology Genome wide association study List of sequenced animal genomes List of sequenced archaeal genomes List of sequenced bacterial genomes List of sequenced eukaryotic genomes List of sequenced fungi genomes List of sequenced plant genomes List of sequenced plastomes List of sequenced protist genomes Metagenomics Microbiome Molecular epidemiology Molecular pathological epidemiology Molecular pathology Nucleic acid sequence Pan genome Precision medicine Regulator gene Whole genome sequencingReferences Edit Roth Stephanie Clare 1 July 2019 What is genomic medicine Journal of the Medical Library Association University Library System University of Pittsburgh 107 3 442 448 doi 10 5195 jmla 2019 604 ISSN 1558 9439 PMC 6579593 PMID 31258451 a b c Graur D 2016 Molecular Genome Evolution Sunderland MA USA Sinauer Associates Inc Brosius J 2009 The Fragmented Gene Annals of 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PMID 15592404 Roest Crollius H Jaillon O Dasilva C Ozouf Costaz C Fizames C Fischer C Bouneau L Billault A Quetier F Saurin W Bernot A Weissenbach J July 2000 Characterization and repeat analysis of the compact genome of the freshwater pufferfish Tetraodon nigroviridis Genome Research 10 7 939 49 doi 10 1101 gr 10 7 939 PMC 310905 PMID 10899143 Jaillon O Aury JM Brunet F Petit JL Stange Thomann N Mauceli E et al October 2004 Genome duplication in the teleost fish Tetraodon nigroviridis reveals the early vertebrate proto karyotype Nature 431 7011 946 57 Bibcode 2004Natur 431 946J doi 10 1038 nature03025 PMID 15496914 Tetraodon Project Information Archived from the original on 26 September 2012 Retrieved 17 October 2012 Martincorena I Campbell PJ September 2015 Somatic mutation in cancer and normal cells Science 349 6255 1483 89 Bibcode 2015Sci 349 1483M doi 10 1126 science aab4082 PMID 26404825 S2CID 13945473 Hajkova P Jeffries SJ Lee C Miller N Jackson SP Surani MA July 2010 Genome wide reprogramming in the mouse germ line entails the base excision repair pathway Science 329 5987 78 82 Bibcode 2010Sci 329 78H doi 10 1126 science 1187945 PMC 3863715 PMID 20595612 Hackett JA Sengupta R Zylicz JJ Murakami K Lee C Down TA Surani MA January 2013 Germline DNA demethylation dynamics and imprint erasure through 5 hydroxymethylcytosine Science 339 6118 448 52 Bibcode 2013Sci 339 448H doi 10 1126 science 1229277 PMC 3847602 PMID 23223451 Gattaca movie Rotten Tomatoes Further reading EditBenfey P Protopapas AD 2004 Essentials of Genomics Prentice Hall Brown TA 2002 Genomes 2 Oxford Bios Scientific Publishers ISBN 978 1 85996 029 5 Gibson G Muse SV 2004 A Primer of Genome Science Second ed Sunderland Mass Sinauer Assoc ISBN 978 0 87893 234 4 Gregory TR 2005 The Evolution of the Genome Elsevier ISBN 978 0 12 301463 4 Reece RJ 2004 Analysis of Genes and Genomes Chichester John Wiley amp Sons ISBN 978 0 470 84379 6 Saccone C Pesole G 2003 Handbook of Comparative Genomics Chichester John Wiley amp Sons ISBN 978 0 471 39128 9 Werner E December 2003 In silico multicellular systems biology and minimal genomes Drug Discovery Today 8 24 1121 27 doi 10 1016 S1359 6446 03 02918 0 PMID 14678738 External links Edit Wikiquote has quotations related to Genome UCSC Genome Browser view the genome and annotations for more than 80 organisms genomecenter howard edu archived 9 August 2013 Build a DNA Molecule archived 9 June 2010 Some comparative genome sizes DNA Interactive The History of DNA Science DNA From The Beginning All About The Human Genome Project from Genome gov Animal genome size database Plant genome size database archived 1 September 2005 GOLD Genomes OnLine Database The Genome News Network NCBI Entrez Genome Project database NCBI Genome Primer GeneCards an integrated database of human genes BBC News Final genome chapter published IMG The Integrated Microbial Genomes system for genome analysis by the DOE JGI GeKnome Technologies Next Gen Sequencing Data Analysis next generation sequencing data analysis for Illumina and 454 Service from GeKnome Technologies archived 3 March 2012 Portals Astronomy Biology Evolutionary biology Paleontology Science Retrieved from https en wikipedia org w index php title Genome amp oldid 1152265636, wikipedia, wiki, book, books, library,

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