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BRCA2

BRCA2 and BRCA2 (/ˌbrækəˈt/[5]) are a human gene and its protein product, respectively. The official symbol (BRCA2, italic for the gene, nonitalic for the protein) and the official name (originally breast cancer 2; currently BRCA2, DNA repair associated) are maintained by the HUGO Gene Nomenclature Committee. One alternative symbol, FANCD1, recognizes its association with the FANC protein complex. Orthologs, styled Brca2 and Brca2, are common in other vertebrate species.[6][7] BRCA2 is a human tumor suppressor gene[8][9] (specifically, a caretaker gene), found in all humans; its protein, also called by the synonym breast cancer type 2 susceptibility protein, is responsible for repairing DNA.[10]

BRCA2
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesBRCA2, BRCC2, BROVCA2, FACD, FAD, FAD1, FANCD, FANCD1, GLM3, PNCA2, XRCC11, breast cancer 2, DNA repair associated, breast cancer 2, early onset, BRCA2 DNA repair associated, Genes
External IDsOMIM: 600185 MGI: 109337 HomoloGene: 41 GeneCards: BRCA2
Orthologs
SpeciesHumanMouse
Entrez
Ensembl
UniProt
RefSeq (mRNA)

NM_000059

NM_001081001
NM_009765

RefSeq (protein)

NP_000050

NP_001074470
NP_033895

Location (UCSC)Chr 13: 32.32 – 32.4 MbChr 5: 150.45 – 150.49 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

BRCA2 and BRCA1 are normally expressed in the cells of breast and other tissue, where they help repair damaged DNA or destroy cells if DNA cannot be repaired. They are involved in the repair of chromosomal damage with an important role in the error-free repair of DNA double strand breaks.[11][12] If BRCA1 or BRCA2 itself is damaged by a BRCA mutation, damaged DNA is not repaired properly, and this increases the risk for breast cancer.[13][14] BRCA1 and BRCA2 have been described as "breast cancer susceptibility genes" and "breast cancer susceptibility proteins". The predominant allele has a normal tumor suppressive function whereas high penetrance mutations in these genes cause a loss of tumor suppressive function, which correlates with an increased risk of breast cancer.[15]

The BRCA2 gene is located on the long (q) arm of chromosome 13 at position 12.3 (13q12.3).[16] The human reference BRCA2 gene contains 27 exons, and the cDNA has 10,254 base pairs[17] coding for a protein of 3418 amino acids.[18][19]

Function Edit

 
Recombinational repair of DNA double-strand damage - some key steps. ATM (ATM) is a protein kinase that is recruited and activated by DNA double-strand breaks. DNA double-strand damages also activate the Fanconi anemia core complex (FANCA/B/C/E/F/G/L/M).[20] The FA core complex monoubiquitinates the downstream targets FANCD2 and FANCI.[21] ATM activates (phosphorylates) CHEK2 and FANCD2[22] CHEK2 phosphorylates BRCA1.[23] Ubiquinated FANCD2 complexes with BRCA1 and RAD51.[24] The PALB2 protein acts as a hub,[25] bringing together BRCA1, BRCA2 and RAD51 at the site of a DNA double-strand break, and also binds to RAD51C, a member of the RAD51 paralog complex RAD51B-RAD51C-RAD51D-XRCC2 (BCDX2). The BCDX2 complex is responsible for RAD51 recruitment or stabilization at damage sites.[26] RAD51 plays a major role in homologous recombinational repair of DNA during double strand break repair. In this process, an ATP dependent DNA strand exchange takes place in which a single strand invades base-paired strands of homologous DNA molecules. RAD51 is involved in the search for homology and strand pairing stages of the process.

Although the structures of the BRCA1 and BRCA2 genes are very different, at least some functions are interrelated. The proteins made by both genes are essential for repairing damaged DNA (see Figure of recombinational repair steps). BRCA2 binds the single strand DNA and directly interacts with the recombinase RAD51 to stimulate[27] and maintain [28] strand invasion, a vital step of homologous recombination. The localization of RAD51 to the DNA double-strand break requires the formation of the BRCA1-PALB2-BRCA2 complex. PALB2 (Partner and localizer of BRCA2)[29] can function synergistically with a BRCA2 chimera (termed piccolo, or piBRCA2) to further promote strand invasion.[30] These breaks can be caused by natural and medical radiation or other environmental exposures, but also occur when chromosomes exchange genetic material during a special type of cell division that creates sperm and eggs (meiosis). Double strand breaks are also generated during repair of DNA cross links. By repairing DNA, these proteins play a role in maintaining the stability of the human genome and prevent dangerous gene rearrangements that can lead to hematologic and other cancers.

BRCA2 has been shown to possess a crucial role in protection from the MRE11-dependent nucleolytic degradation of the reversed forks that are forming during DNA replication fork stalling (caused by obstacles such as mutations, intercalating agents etc.).[31]

Like BRCA1, BRCA2 probably regulates the activity of other genes and plays a critical role in embryo development.

Clinical significance Edit

 
Absolute risk of cancers in BRCA1 or BRCA2 mutation.[32]

Certain variations of the BRCA2 gene increase risks for breast cancer as part of a hereditary breast–ovarian cancer syndrome. Researchers have identified hundreds of mutations in the BRCA2 gene, many of which cause an increased risk of cancer. BRCA2 mutations are usually insertions or deletions of a small number of DNA base pairs in the gene. As a result of these mutations, the protein product of the BRCA2 gene is abnormal, and does not function properly. Researchers believe that the defective BRCA2 protein is unable to fix DNA damage that occurs throughout the genome. As a result, there is an increase in mutations due to error-prone translesion synthesis past un-repaired DNA damage, and some of these mutations can cause cells to divide in an uncontrolled way and form a tumor.

People who have two mutated copies of the BRCA2 gene have one type of Fanconi anemia. This condition is caused by extremely reduced levels of the BRCA2 protein in cells, which allows the accumulation of damaged DNA. Patients with Fanconi anemia are prone to several types of leukemia (a type of blood cell cancer); solid tumors, particularly of the head, neck, skin, and reproductive organs; and bone marrow suppression (reduced blood cell production that leads to anemia). Women having inherited a defective BRCA1 or BRCA2 gene have risks for breast and ovarian cancer that are so high and seem so selective that many mutation carriers choose to have prophylactic surgery. There has been much conjecture to explain such apparently striking tissue specificity. Major determinants of where BRCA1- and BRCA2-associated hereditary cancers occur are related to tissue specificity of the cancer pathogen, the agent that causes chronic inflammation, or the carcinogen. The target tissue may have receptors for the pathogen, become selectively exposed to carcinogens and an infectious process. An innate genomic deficit impairs normal responses and exacerbates the susceptibility to disease in organ targets. This theory also fits data for several tumor suppressors beyond BRCA1 or BRCA2. A major advantage of this model is that it suggests there are some options in addition to prophylactic surgery.[33]

In addition to breast cancer in men and women, mutations in BRCA2 also lead to an increased risk of ovarian, uterine tube, prostate and pancreatic cancer. In some studies, mutations in the central part of the gene have been associated with a higher risk of ovarian cancer and a lower risk of prostate cancer than mutations in other parts of the gene. Several other types of cancer have also been seen in certain families with BRCA2 mutations.

In general, strongly inherited gene mutations (including mutations in BRCA2) account for only 5-10% of breast cancer cases; the specific risk of getting breast or other cancer for anyone carrying a BRCA2 mutation depends on many factors.[34]

History Edit

The BRCA2 gene was discovered in 1994.[35][16][36] In 1996, Kenneth Offit and his research group at Memorial Sloan Kettering Cancer Center successfully identified the most common mutation on the gene associated with breast and ovarian cancer among individuals of Ashkenazi Jewish ancestry.[37][38][39][40]

The gene was first cloned by scientists at Myriad Genetics, Endo Recherche, Inc., HSC Research & Development Limited Partnership, and the University of Pennsylvania.[41]

Methods to diagnose the likelihood of a patient with mutations in BRCA1 and BRCA2 getting cancer were covered by patents owned or controlled by Myriad Genetics.[42][43] Myriad's business model of exclusively offering the diagnostic test led from Myriad's beginnings as a startup in 1994 to its being a publicly traded company with 1200 employees and about $500M in annual revenue in 2012;[44] it also led to controversy over high test prices and the unavailability of second opinions from other diagnostic labs, which in turn led to the landmark Association for Molecular Pathology v. Myriad Genetics lawsuit.[45]

Germline mutations and founder effect Edit

All germline BRCA2 mutations identified to date have been inherited, suggesting the possibility of a large "founder" effect in which a certain mutation is common to a well-defined population group and can theoretically be traced back to a common ancestor. Given the complexity of mutation screening for BRCA2, these common mutations may simplify the methods required for mutation screening in certain populations. Analysis of mutations that occur with high frequency also permits the study of their clinical expression.[46] A striking example of a founder mutation is found in Iceland, where a single BRCA2 (999del5) mutation accounts for virtually all breast/ovarian cancer families.[47][48] This frame-shift mutation leads to a highly truncated protein product. In a large study examining hundreds of cancer and control individuals, this 999del5 mutation was found in 0.6% of the general population. Of note, while 72% of patients who were found to be carriers had a moderate or strong family history of breast cancer, 28% had little or no family history of the disease. This strongly suggests the presence of modifying genes that affect the phenotypic expression of this mutation, or possibly the interaction of the BRCA2 mutation with environmental factors. Additional examples of founder mutations in BRCA2 are given in the table below.

Population or subgroup BRCA2 mutation(s)[46][49] Reference(s)
Ashkenazi Jewish 6174delT [50]
Dutch 5579insA [51]
Finns 8555T>G, 999del5, IVS23-2A>G [52][53]
French Canadians 8765delAG, 3398delAAAAG [54][55][56]
Hungarians 9326insA [57]
Icelanders 999del5 [47][48]
Italians 8765delAG [58]
Northern Irish 6503delTT [59]
Pakistanis 3337C>T [60]
Scottish 6503delTT [59]
Slovenians IVS16-2A>G [61]
Spanish 3034delAAAC(codon936), 9254del5 [62]
Swedish 4486delG [63]

Meiosis Edit

In the plant Arabidopsis thaliana, loss of the BRCA2 homolog AtBRCA2 causes severe defects in both male meiosis and in the development of the female gametocyte.[64] AtBRCA2 protein is required for proper localization of the synaptonemal complex protein AtZYP1 and the recombinases AtRAD51 and AtDMC1. Furthermore, AtBRCA2 is required for proper meiotic synapsis. Thus AtBRCA2 is likely important for meiotic recombination. It appears that AtBRCA2 acts during meiosis to control the single-strand invasion steps mediated by AtRAD51 and AtDMC1 occurring during meiotic homologous recombinational repair of DNA damages.[64]

Homologs of BRCA2 are also essential for meiosis in the fungus Ustilago maydis,[65] the worm Caenorhabditis elegans,[66][67] and the fruitfly Drosophila melanogaster.[68]

Mice that produce truncated versions of BRCA2 are viable but sterile.[69] BRCA2 mutant rats have a phenotype of growth inhibition and sterility in both sexes.[70] Aspermatogenesis in these mutant rats is due to a failure of homologous chromosome synapsis during meiosis.

BRC repeat sequences Edit

DMC1 (DNA meiotic recombinase 1) is a meiosis specific homolog of RAD51 that mediates strand exchange during homologous recombinational repair. DMC1 promotes the formation of DNA strand invasion products (joint molecules) between homologous DNA molecules. Human DMC1 interacts directly with each of a series of repeat sequences in the BRCA2 protein (called BRC repeats) that stimulate joint molecule formation by DMC1.[71] BRC repeats conform to a motif consisting of a sequence of about 35 highly conserved amino acids that are present at least once in all BRCA2-like proteins. The BRCA2 BRC repeats stimulate joint molecule formation by promoting the interaction of single-stranded DNA (ssDNA) with DMC1.[71] The ssDNA complexed with DMC1 can pair with homologous ssDNA from another chromosome during the synopsis stage of meiosis to form a joint molecule, a central step in homologous recombination. Thus the BRC repeat sequences of BRCA2 appear to play a key role in recombinational repair of DNA damages during meiotic recombination.

Overall, it appears that homologous recombination during meiosis functions to repair DNA damages,[citation needed] and that BRCA2 plays a key role in performing this function.

Neurogenesis Edit

BRCA2 is required in the mouse for neurogenesis and suppression of medulloblastoma.[72] ‘’BRCA2’’ loss profoundly affects neurogenesis, particularly during embryonic and postnatal neural development. These neurological defects arise from DNA damage.[72]

Epigenetic control Edit

Epigenetic alterations in expression of BRCA2 (causing over-expression or under-expression) are very frequent in sporadic cancers (see Table below) while mutations in BRCA2 are rarely found.[73][74][75]

In non-small cell lung cancer, BRCA2 is epigenetically repressed by hypermethylation of the promoter.[76] In this case, promoter hypermethylation is significantly associated with low mRNA expression and low protein expression but not with loss of heterozygosity of the gene.

In sporadic ovarian cancer, an opposite effect is found. BRCA2 promoter and 5'-UTR regions have relatively few or no methylated CpG dinucleotides in the tumor DNA compared with that of non-tumor DNA, and a significant correlation is found between hypomethylation and a >3-fold over-expression of BRCA2.[77] This indicates that hypomethylation of the BRCA2 promoter and 5'-UTR regions leads to over-expression of BRCA2 mRNA.

One report indicated some epigenetic control of BRCA2 expression by the microRNAs miR-146a and miR-148a.[78]

BRCA2 expression in cancer Edit

In eukaryotes, BRCA2 protein has an important role in homologous recombinational repair. In mice and humans, BRCA2 primarily mediates orderly assembly of RAD51 on single-stranded (ss) DNA, the form that is active for homologous pairing and strand invasion.[79] BRCA2 also redirects RAD51 from double-stranded DNA and prevents dissociation from ssDNA.[79] In addition, the four paralogs of RAD51, consisting of RAD51B (RAD51L1), RAD51C (RAD51L2), RAD51D (RAD51L3), XRCC2 form a complex called the BCDX2 complex (see Figure: Recombinational repair of DNA). This complex participates in RAD51 recruitment or stabilization at damage sites.[26] The BCDX2 complex appears to act by facilitating the assembly or stability of the RAD51 nucleoprotein filament. RAD51 catalyses strand transfer between a broken sequence and its undamaged homologue to allow re-synthesis of the damaged region (see homologous recombination models).

Some studies of cancers report over-expressed BRCA2 whereas other studies report under-expression of BRCA2. At least two reports found over-expression in some sporadic breast tumors and under-expression in other sporadic breast tumors.[80][81] (see Table).

Many cancers have epigenetic deficiencies in various DNA repair genes (see Frequencies of epimutations in DNA repair genes in cancers). These repair deficiencies likely cause increased unrepaired DNA damages. The over-expression of BRCA2 seen in many cancers may reflect compensatory BRCA2 over-expression and increased homologous recombinational repair to at least partially deal with such excess DNA damages. Egawa et al.[82] suggest that increased expression of BRCA2 can be explained by the genomic instability frequently seen in cancers, which induces BRCA2 mRNA expression due to an increased need for BRCA2 for DNA repair.

Under-expression of BRCA2 would itself lead to increased unrepaired DNA damages. Replication errors past these damages (see translesion synthesis) would lead to increased mutations and cancer.

BRCA2 expression in sporadic cancers
Cancer Over or Under expression Frequency of altered expression Evaluation method Ref.
Sporadic ovarian cancer Over-expression 80% messenger RNA [77]
Sporadic ovarian cancer Under-expression 42% immunohistochemistry [83]
(recurrent cancer in study above) Increased-expression 71% immunohistochemistry [83]
Non-small cell lung cancer Under-expression 34% immunohistochemistry [76]
Breast cancer Over-expression 66% messenger RNA [82]
Breast cancer Over-expression 20% messenger RNA [80]
(same study as above) Under-expression 11% messenger RNA [80]
Breast cancer Over-expression 30% immunohistochemistry [81]
(same study as above) Under-expression 30% immunohistochemistry [81]
Triple negative breast cancer Under-expression 90% immunohistochemistry [84]

Interactions Edit

BRCA2 has been shown to interact with

Domain architecture Edit

BRCA2 repeat
 
crystal structure of a rad51-brca2 brc repeat complex
Identifiers
SymbolBRCA2
PfamPF00634
InterProIPR002093
SCOP21n0w / SCOPe / SUPFAM
Available protein structures:
Pfam  structures / ECOD  
PDBRCSB PDB; PDBe; PDBj
PDBsumstructure summary

BRCA2 contains a number of 39 amino acid repeats that are critical for binding to RAD51 (a key protein in DNA recombinational repair) and resistance to methyl methanesulphonate treatment.[101][108][109][117]

The BRCA2 helical domain adopts a helical structure, consisting of a four-helix cluster core (alpha 1, alpha 8, alpha 9, alpha 10) and two successive beta-hairpins (beta 1 to beta 4). An approximately 50-amino acid segment that contains four short helices (alpha 2 to alpha 4), meanders around the surface of the core structure. In BRCA2, the alpha 9 and alpha 10 helices pack with the BRCA2 OB1 domain through van der Waals contacts involving hydrophobic and aromatic residues, and also through side-chain and backbone hydrogen bonds. This domain binds the 70-amino acid DSS1 (deleted in split-hand/split foot syndrome) protein, which was originally identified as one of three genes that map to a 1.5-Mb locus deleted in an inherited developmental malformation syndrome.[115]

The BRCA OB1 domain assumes an OB fold, which consists of a highly curved five-stranded beta-sheet that closes on itself to form a beta-barrel. OB1 has a shallow groove formed by one face of the curved sheet and is demarcated by two loops, one between beta 1 and beta 2 and another between beta 4 and beta 5, which allows for weak single strand DNA binding. The domain also binds the 70-amino acid DSS1 (deleted in split-hand/split foot syndrome) protein.[115]

The BRCA OB3 domain assumes an OB fold, which consists of a highly curved five-stranded beta-sheet that closes on itself to form a beta-barrel. OB3 has a pronounced groove formed by one face of the curved sheet and is demarcated by two loops, one between beta 1 and beta 2 and another between beta 4 and beta 5, which allows for strong ssDNA binding.[115]

The Tower domain adopts a secondary structure consisting of a pair of long, antiparallel alpha-helices (the stem) that support a three-helix bundle (3HB) at their end. The 3HB contains a helix-turn-helix motif and is similar to the DNA binding domains of the bacterial site-specific recombinases, and of eukaryotic Myb and homeodomain transcription factors. The Tower domain has an important role in the tumour suppressor function of BRCA2, and is essential for appropriate binding of BRCA2 to DNA.[115] Studies shown that conformation of this tower domain is allosterically controlled by a small protein "DSS1", which interacts with helical, OB1 and OB2 domains of BRCA2.[118]

Patents, enforcement, litigation, and controversy Edit

A patent application for the isolated BRCA1 gene and cancer-cancer promoting mutations, as well as methods to diagnose the likelihood of getting breast cancer, was filed by the University of Utah, National Institute of Environmental Health Sciences (NIEHS) and Myriad Genetics in 1994;[42] over the next year, Myriad, in collaboration with other investigators, isolated and sequenced the BRCA2 gene and identified relevant mutations, and the first BRCA2 patent was filed in the U.S. by Myriad and the other institutions in 1995.[41] Myriad is the exclusive licensee of these patents and has enforced them in the US against clinical diagnostic labs.[45] This business model led from Myriad being a startup in 1994 to being a publicly traded company with 1200 employees and about $500M in annual revenue in 2012;[44] it also led to controversy over high prices and the inability to get second opinions from other diagnostic labs, which in turn led to the landmark Association for Molecular Pathology v. Myriad Genetics lawsuit.[45][119] The patents begin to expire in 2014.

Peter Meldrum, CEO of Myriad Genetics, has acknowledged that Myriad has "other competitive advantages that may make such [patent] enforcement unnecessary" in Europe.[120]

Legal decisions surrounding the BRCA1 and BRCA2 patents will affect the field of genetic testing in general.[121] In June 2013, in Association for Molecular Pathology v. Myriad Genetics (No. 12-398), the US Supreme Court unanimously ruled that, "A naturally occurring DNA segment is a product of nature and not patent eligible merely because it has been isolated," invalidating Myriad's patents on the BRCA1 and BRCA2 genes. However, the Court also held that manipulation of a gene to create something not found in nature could still be eligible for patent protection.[122] The Federal Court of Australia came to the opposite conclusion, upholding the validity of an Australian Myriad Genetics patent over the BRCA1 gene in February 2013,[123] but this decision is being appealed and the appeal will include consideration of the US Supreme Court ruling.[124]

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Further reading Edit

  • Zou JP, Hirose Y, Siddique H, Rao VN, Reddy ES (1999). "Structure and expression of variant BRCA2a lacking the transactivation domain". Oncology Reports. 6 (2): 437–40. doi:10.3892/or.6.2.437. PMID 10023017.
  • Venkitaraman AR (2001). "Chromosome stability, DNA recombination and the BRCA2 tumour suppressor". Current Opinion in Cell Biology. 13 (3): 338–43. doi:10.1016/S0955-0674(00)00217-9. PMID 11343905.
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External links Edit

This article incorporates text from the public domain Pfam and InterPro: IPR002093
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brca2, human, gene, protein, product, respectively, official, symbol, italic, gene, nonitalic, protein, official, name, originally, breast, cancer, currently, repair, associated, maintained, hugo, gene, nomenclature, committee, alternative, symbol, fancd1, rec. BRCA2 and BRCA2 ˌ b r ae k e ˈ t uː 5 are a human gene and its protein product respectively The official symbol BRCA2 italic for the gene nonitalic for the protein and the official name originally breast cancer 2 currently BRCA2 DNA repair associated are maintained by the HUGO Gene Nomenclature Committee One alternative symbol FANCD1 recognizes its association with the FANC protein complex Orthologs styled Brca2 and Brca2 are common in other vertebrate species 6 7 BRCA2 is a human tumor suppressor gene 8 9 specifically a caretaker gene found in all humans its protein also called by the synonym breast cancer type 2 susceptibility protein is responsible for repairing DNA 10 BRCA2Available structuresPDBOrtholog search PDBe RCSBList of PDB id codes1N0W 3EU7IdentifiersAliasesBRCA2 BRCC2 BROVCA2 FACD FAD FAD1 FANCD FANCD1 GLM3 PNCA2 XRCC11 breast cancer 2 DNA repair associated breast cancer 2 early onset BRCA2 DNA repair associated GenesExternal IDsOMIM 600185 MGI 109337 HomoloGene 41 GeneCards BRCA2Gene location Human Chr Chromosome 13 human 1 Band13q13 1Start32 315 086 bp 1 End32 400 268 bp 1 Gene location Mouse Chr Chromosome 5 mouse 2 Band5 G3 5 89 52 cMStart150 446 095 bp 2 End150 493 794 bp 2 RNA expression patternBgeeHumanMouse ortholog Top expressed insecondary oocyteganglionic eminencebone marrow cellscancellous bonestromal cell of endometriumAchilles tendontesticlemonocyterectumlymph nodeTop expressed insecondary oocyteseminiferous tubulemaxillary prominenceankle jointprimitive streakspermatocytemorulablastocystcondylespermatidMore reference expression dataBioGPSMore reference expression dataGene ontologyMolecular functionDNA binding H4 histone acetyltransferase activity H3 histone acetyltransferase activity protease binding histone acetyltransferase activity protein binding gamma tubulin binding single stranded DNA binding protein C terminus binding identical protein bindingCellular componentcentrosome BRCA2 MAGE D1 complex secretory granule nucleoplasm microtubule organizing center nucleus cytoskeleton lateral element cytoplasm cytosol protein containing complexBiological processchordate embryonic development nucleotide excision repair intrinsic apoptotic signaling pathway in response to DNA damage by p53 class mediator DNA recombination regulation of cytokinesis replication fork protection centrosome duplication male meiosis I negative regulation of mammary gland epithelial cell proliferation positive regulation of mitotic cell cycle chromosome organization female gonad development inner cell mass cell proliferation positive regulation of transcription DNA templated telomere maintenance via recombination brain development oocyte maturation histone H3 acetylation spermatogenesis intrinsic apoptotic signaling pathway in response to DNA damage establishment of protein localization to telomere histone H4 acetylation cellular response to DNA damage stimulus cell cycle cell population proliferation response to gamma radiation response to UV C response to X ray DNA damage response signal transduction by p53 class mediator resulting in transcription of p21 class mediator mitotic recombination dependent replication fork processing double strand break repair via homologous recombination DNA repair double strand break repair mitotic cytokinesis hemopoiesis response to nutrient meiotic DNA repair synthesis involved in reciprocal meiotic recombination mammary gland development homologous chromosome orientation involved in meiotic metaphase I plate congression response to estradiol multicellular organism growth DNA synthesis involved in double strand break repair via homologous recombination meiotic recombination checkpoint signalingSources Amigo QuickGOOrthologsSpeciesHumanMouseEntrez67512190EnsemblENSG00000139618ENSMUSG00000041147UniProtP51587P97929RefSeq mRNA NM 000059NM 001081001NM 009765RefSeq protein NP 000050NP 001074470NP 033895Location UCSC Chr 13 32 32 32 4 MbChr 5 150 45 150 49 MbPubMed search 3 4 WikidataView Edit HumanView Edit MouseBRCA2 and BRCA1 are normally expressed in the cells of breast and other tissue where they help repair damaged DNA or destroy cells if DNA cannot be repaired They are involved in the repair of chromosomal damage with an important role in the error free repair of DNA double strand breaks 11 12 If BRCA1 or BRCA2 itself is damaged by a BRCA mutation damaged DNA is not repaired properly and this increases the risk for breast cancer 13 14 BRCA1 and BRCA2 have been described as breast cancer susceptibility genes and breast cancer susceptibility proteins The predominant allele has a normal tumor suppressive function whereas high penetrance mutations in these genes cause a loss of tumor suppressive function which correlates with an increased risk of breast cancer 15 The BRCA2 gene is located on the long q arm of chromosome 13 at position 12 3 13q12 3 16 The human reference BRCA2 gene contains 27 exons and the cDNA has 10 254 base pairs 17 coding for a protein of 3418 amino acids 18 19 Contents 1 Function 2 Clinical significance 3 History 4 Germline mutations and founder effect 5 Meiosis 5 1 BRC repeat sequences 6 Neurogenesis 7 Epigenetic control 8 BRCA2 expression in cancer 9 Interactions 10 Domain architecture 11 Patents enforcement litigation and controversy 12 References 13 Further reading 14 External linksFunction Edit nbsp Recombinational repair of DNA double strand damage some key steps ATM ATM is a protein kinase that is recruited and activated by DNA double strand breaks DNA double strand damages also activate the Fanconi anemia core complex FANCA B C E F G L M 20 The FA core complex monoubiquitinates the downstream targets FANCD2 and FANCI 21 ATM activates phosphorylates CHEK2 and FANCD2 22 CHEK2 phosphorylates BRCA1 23 Ubiquinated FANCD2 complexes with BRCA1 and RAD51 24 The PALB2 protein acts as a hub 25 bringing together BRCA1 BRCA2 and RAD51 at the site of a DNA double strand break and also binds to RAD51C a member of the RAD51 paralog complex RAD51B RAD51C RAD51D XRCC2 BCDX2 The BCDX2 complex is responsible for RAD51 recruitment or stabilization at damage sites 26 RAD51 plays a major role in homologous recombinational repair of DNA during double strand break repair In this process an ATP dependent DNA strand exchange takes place in which a single strand invades base paired strands of homologous DNA molecules RAD51 is involved in the search for homology and strand pairing stages of the process Although the structures of the BRCA1 and BRCA2 genes are very different at least some functions are interrelated The proteins made by both genes are essential for repairing damaged DNA see Figure of recombinational repair steps BRCA2 binds the single strand DNA and directly interacts with the recombinase RAD51 to stimulate 27 and maintain 28 strand invasion a vital step of homologous recombination The localization of RAD51 to the DNA double strand break requires the formation of the BRCA1 PALB2 BRCA2 complex PALB2 Partner and localizer of BRCA2 29 can function synergistically with a BRCA2 chimera termed piccolo or piBRCA2 to further promote strand invasion 30 These breaks can be caused by natural and medical radiation or other environmental exposures but also occur when chromosomes exchange genetic material during a special type of cell division that creates sperm and eggs meiosis Double strand breaks are also generated during repair of DNA cross links By repairing DNA these proteins play a role in maintaining the stability of the human genome and prevent dangerous gene rearrangements that can lead to hematologic and other cancers BRCA2 has been shown to possess a crucial role in protection from the MRE11 dependent nucleolytic degradation of the reversed forks that are forming during DNA replication fork stalling caused by obstacles such as mutations intercalating agents etc 31 Like BRCA1 BRCA2 probably regulates the activity of other genes and plays a critical role in embryo development Clinical significance Edit nbsp Absolute risk of cancers in BRCA1 or BRCA2 mutation 32 Further information BRCA mutation Certain variations of the BRCA2 gene increase risks for breast cancer as part of a hereditary breast ovarian cancer syndrome Researchers have identified hundreds of mutations in the BRCA2 gene many of which cause an increased risk of cancer BRCA2 mutations are usually insertions or deletions of a small number of DNA base pairs in the gene As a result of these mutations the protein product of the BRCA2 gene is abnormal and does not function properly Researchers believe that the defective BRCA2 protein is unable to fix DNA damage that occurs throughout the genome As a result there is an increase in mutations due to error prone translesion synthesis past un repaired DNA damage and some of these mutations can cause cells to divide in an uncontrolled way and form a tumor People who have two mutated copies of the BRCA2 gene have one type of Fanconi anemia This condition is caused by extremely reduced levels of the BRCA2 protein in cells which allows the accumulation of damaged DNA Patients with Fanconi anemia are prone to several types of leukemia a type of blood cell cancer solid tumors particularly of the head neck skin and reproductive organs and bone marrow suppression reduced blood cell production that leads to anemia Women having inherited a defective BRCA1 or BRCA2 gene have risks for breast and ovarian cancer that are so high and seem so selective that many mutation carriers choose to have prophylactic surgery There has been much conjecture to explain such apparently striking tissue specificity Major determinants of where BRCA1 and BRCA2 associated hereditary cancers occur are related to tissue specificity of the cancer pathogen the agent that causes chronic inflammation or the carcinogen The target tissue may have receptors for the pathogen become selectively exposed to carcinogens and an infectious process An innate genomic deficit impairs normal responses and exacerbates the susceptibility to disease in organ targets This theory also fits data for several tumor suppressors beyond BRCA1 or BRCA2 A major advantage of this model is that it suggests there are some options in addition to prophylactic surgery 33 In addition to breast cancer in men and women mutations in BRCA2 also lead to an increased risk of ovarian uterine tube prostate and pancreatic cancer In some studies mutations in the central part of the gene have been associated with a higher risk of ovarian cancer and a lower risk of prostate cancer than mutations in other parts of the gene Several other types of cancer have also been seen in certain families with BRCA2 mutations In general strongly inherited gene mutations including mutations in BRCA2 account for only 5 10 of breast cancer cases the specific risk of getting breast or other cancer for anyone carrying a BRCA2 mutation depends on many factors 34 History EditThe BRCA2 gene was discovered in 1994 35 16 36 In 1996 Kenneth Offit and his research group at Memorial Sloan Kettering Cancer Center successfully identified the most common mutation on the gene associated with breast and ovarian cancer among individuals of Ashkenazi Jewish ancestry 37 38 39 40 The gene was first cloned by scientists at Myriad Genetics Endo Recherche Inc HSC Research amp Development Limited Partnership and the University of Pennsylvania 41 Methods to diagnose the likelihood of a patient with mutations in BRCA1 and BRCA2 getting cancer were covered by patents owned or controlled by Myriad Genetics 42 43 Myriad s business model of exclusively offering the diagnostic test led from Myriad s beginnings as a startup in 1994 to its being a publicly traded company with 1200 employees and about 500M in annual revenue in 2012 44 it also led to controversy over high test prices and the unavailability of second opinions from other diagnostic labs which in turn led to the landmark Association for Molecular Pathology v Myriad Genetics lawsuit 45 Germline mutations and founder effect Edit All germline BRCA2 mutations identified to date have been inherited suggesting the possibility of a large founder effect in which a certain mutation is common to a well defined population group and can theoretically be traced back to a common ancestor Given the complexity of mutation screening for BRCA2 these common mutations may simplify the methods required for mutation screening in certain populations Analysis of mutations that occur with high frequency also permits the study of their clinical expression 46 A striking example of a founder mutation is found in Iceland where a single BRCA2 999del5 mutation accounts for virtually all breast ovarian cancer families 47 48 This frame shift mutation leads to a highly truncated protein product In a large study examining hundreds of cancer and control individuals this 999del5 mutation was found in 0 6 of the general population Of note while 72 of patients who were found to be carriers had a moderate or strong family history of breast cancer 28 had little or no family history of the disease This strongly suggests the presence of modifying genes that affect the phenotypic expression of this mutation or possibly the interaction of the BRCA2 mutation with environmental factors Additional examples of founder mutations in BRCA2 are given in the table below This is a dynamic list and may never be able to satisfy particular standards for completeness You can help by adding missing items with reliable sources Population or subgroup BRCA2 mutation s 46 49 Reference s Ashkenazi Jewish 6174delT 50 Dutch 5579insA 51 Finns 8555T gt G 999del5 IVS23 2A gt G 52 53 French Canadians 8765delAG 3398delAAAAG 54 55 56 Hungarians 9326insA 57 Icelanders 999del5 47 48 Italians 8765delAG 58 Northern Irish 6503delTT 59 Pakistanis 3337C gt T 60 Scottish 6503delTT 59 Slovenians IVS16 2A gt G 61 Spanish 3034delAAAC codon936 9254del5 62 Swedish 4486delG 63 Meiosis Edit In the plant Arabidopsis thaliana loss of the BRCA2 homolog AtBRCA2 causes severe defects in both male meiosis and in the development of the female gametocyte 64 AtBRCA2 protein is required for proper localization of the synaptonemal complex protein AtZYP1 and the recombinases AtRAD51 and AtDMC1 Furthermore AtBRCA2 is required for proper meiotic synapsis Thus AtBRCA2 is likely important for meiotic recombination It appears that AtBRCA2 acts during meiosis to control the single strand invasion steps mediated by AtRAD51 and AtDMC1 occurring during meiotic homologous recombinational repair of DNA damages 64 Homologs of BRCA2 are also essential for meiosis in the fungus Ustilago maydis 65 the worm Caenorhabditis elegans 66 67 and the fruitfly Drosophila melanogaster 68 Mice that produce truncated versions of BRCA2 are viable but sterile 69 BRCA2 mutant rats have a phenotype of growth inhibition and sterility in both sexes 70 Aspermatogenesis in these mutant rats is due to a failure of homologous chromosome synapsis during meiosis BRC repeat sequences Edit DMC1 DNA meiotic recombinase 1 is a meiosis specific homolog of RAD51 that mediates strand exchange during homologous recombinational repair DMC1 promotes the formation of DNA strand invasion products joint molecules between homologous DNA molecules Human DMC1 interacts directly with each of a series of repeat sequences in the BRCA2 protein called BRC repeats that stimulate joint molecule formation by DMC1 71 BRC repeats conform to a motif consisting of a sequence of about 35 highly conserved amino acids that are present at least once in all BRCA2 like proteins The BRCA2 BRC repeats stimulate joint molecule formation by promoting the interaction of single stranded DNA ssDNA with DMC1 71 The ssDNA complexed with DMC1 can pair with homologous ssDNA from another chromosome during the synopsis stage of meiosis to form a joint molecule a central step in homologous recombination Thus the BRC repeat sequences of BRCA2 appear to play a key role in recombinational repair of DNA damages during meiotic recombination Overall it appears that homologous recombination during meiosis functions to repair DNA damages citation needed and that BRCA2 plays a key role in performing this function Neurogenesis Edit BRCA2 is required in the mouse for neurogenesis and suppression of medulloblastoma 72 BRCA2 loss profoundly affects neurogenesis particularly during embryonic and postnatal neural development These neurological defects arise from DNA damage 72 Epigenetic control Edit Epigenetic alterations in expression of BRCA2 causing over expression or under expression are very frequent in sporadic cancers see Table below while mutations in BRCA2 are rarely found 73 74 75 In non small cell lung cancer BRCA2 is epigenetically repressed by hypermethylation of the promoter 76 In this case promoter hypermethylation is significantly associated with low mRNA expression and low protein expression but not with loss of heterozygosity of the gene In sporadic ovarian cancer an opposite effect is found BRCA2 promoter and 5 UTR regions have relatively few or no methylated CpG dinucleotides in the tumor DNA compared with that of non tumor DNA and a significant correlation is found between hypomethylation and a gt 3 fold over expression of BRCA2 77 This indicates that hypomethylation of the BRCA2 promoter and 5 UTR regions leads to over expression of BRCA2 mRNA One report indicated some epigenetic control of BRCA2 expression by the microRNAs miR 146a and miR 148a 78 BRCA2 expression in cancer Edit In eukaryotes BRCA2 protein has an important role in homologous recombinational repair In mice and humans BRCA2 primarily mediates orderly assembly of RAD51 on single stranded ss DNA the form that is active for homologous pairing and strand invasion 79 BRCA2 also redirects RAD51 from double stranded DNA and prevents dissociation from ssDNA 79 In addition the four paralogs of RAD51 consisting of RAD51B RAD51L1 RAD51C RAD51L2 RAD51D RAD51L3 XRCC2 form a complex called the BCDX2 complex see Figure Recombinational repair of DNA This complex participates in RAD51 recruitment or stabilization at damage sites 26 The BCDX2 complex appears to act by facilitating the assembly or stability of the RAD51 nucleoprotein filament RAD51 catalyses strand transfer between a broken sequence and its undamaged homologue to allow re synthesis of the damaged region see homologous recombination models Some studies of cancers report over expressed BRCA2 whereas other studies report under expression of BRCA2 At least two reports found over expression in some sporadic breast tumors and under expression in other sporadic breast tumors 80 81 see Table Many cancers have epigenetic deficiencies in various DNA repair genes see Frequencies of epimutations in DNA repair genes in cancers These repair deficiencies likely cause increased unrepaired DNA damages The over expression of BRCA2 seen in many cancers may reflect compensatory BRCA2 over expression and increased homologous recombinational repair to at least partially deal with such excess DNA damages Egawa et al 82 suggest that increased expression of BRCA2 can be explained by the genomic instability frequently seen in cancers which induces BRCA2 mRNA expression due to an increased need for BRCA2 for DNA repair Under expression of BRCA2 would itself lead to increased unrepaired DNA damages Replication errors past these damages see translesion synthesis would lead to increased mutations and cancer BRCA2 expression in sporadic cancers Cancer Over or Under expression Frequency of altered expression Evaluation method Ref Sporadic ovarian cancer Over expression 80 messenger RNA 77 Sporadic ovarian cancer Under expression 42 immunohistochemistry 83 recurrent cancer in study above Increased expression 71 immunohistochemistry 83 Non small cell lung cancer Under expression 34 immunohistochemistry 76 Breast cancer Over expression 66 messenger RNA 82 Breast cancer Over expression 20 messenger RNA 80 same study as above Under expression 11 messenger RNA 80 Breast cancer Over expression 30 immunohistochemistry 81 same study as above Under expression 30 immunohistochemistry 81 Triple negative breast cancer Under expression 90 immunohistochemistry 84 Interactions Edit BRCA2 has been shown to interact with BRE 85 BARD1 85 86 BCCIP 87 BRCA1 85 88 89 90 BRCC3 85 BUB1B 91 CREBBP 92 C11orf30 93 FANCD2 94 95 96 FANCG 97 FLNA 98 HMG20B 99 100 P53 85 101 PALB2 29 102 PCAF 103 104 PLK1 103 105 RAD51 85 88 103 106 107 108 109 110 111 112 87 89 101 RPA1 113 SHFM1 114 115 and SMAD3 116 Domain architecture Edit BRCA2 repeat nbsp crystal structure of a rad51 brca2 brc repeat complexIdentifiersSymbolBRCA2PfamPF00634InterProIPR002093SCOP21n0w SCOPe SUPFAMAvailable protein structures Pfam structures ECOD PDBRCSB PDB PDBe PDBjPDBsumstructure summaryBRCA2 contains a number of 39 amino acid repeats that are critical for binding to RAD51 a key protein in DNA recombinational repair and resistance to methyl methanesulphonate treatment 101 108 109 117 The BRCA2 helical domain adopts a helical structure consisting of a four helix cluster core alpha 1 alpha 8 alpha 9 alpha 10 and two successive beta hairpins beta 1 to beta 4 An approximately 50 amino acid segment that contains four short helices alpha 2 to alpha 4 meanders around the surface of the core structure In BRCA2 the alpha 9 and alpha 10 helices pack with the BRCA2 OB1 domain through van der Waals contacts involving hydrophobic and aromatic residues and also through side chain and backbone hydrogen bonds This domain binds the 70 amino acid DSS1 deleted in split hand split foot syndrome protein which was originally identified as one of three genes that map to a 1 5 Mb locus deleted in an inherited developmental malformation syndrome 115 The BRCA OB1 domain assumes an OB fold which consists of a highly curved five stranded beta sheet that closes on itself to form a beta barrel OB1 has a shallow groove formed by one face of the curved sheet and is demarcated by two loops one between beta 1 and beta 2 and another between beta 4 and beta 5 which allows for weak single strand DNA binding The domain also binds the 70 amino acid DSS1 deleted in split hand split foot syndrome protein 115 The BRCA OB3 domain assumes an OB fold which consists of a highly curved five stranded beta sheet that closes on itself to form a beta barrel OB3 has a pronounced groove formed by one face of the curved sheet and is demarcated by two loops one between beta 1 and beta 2 and another between beta 4 and beta 5 which allows for strong ssDNA binding 115 The Tower domain adopts a secondary structure consisting of a pair of long antiparallel alpha helices the stem that support a three helix bundle 3HB at their end The 3HB contains a helix turn helix motif and is similar to the DNA binding domains of the bacterial site specific recombinases and of eukaryotic Myb and homeodomain transcription factors The Tower domain has an important role in the tumour suppressor function of BRCA2 and is essential for appropriate binding of BRCA2 to DNA 115 Studies shown that conformation of this tower domain is allosterically controlled by a small protein DSS1 which interacts with helical OB1 and OB2 domains of BRCA2 118 Patents enforcement litigation and controversy Edit Main article Association for Molecular Pathology v Myriad Genetics A patent application for the isolated BRCA1 gene and cancer cancer promoting mutations as well as methods to diagnose the likelihood of getting breast cancer was filed by the University of Utah National Institute of Environmental Health Sciences NIEHS and Myriad Genetics in 1994 42 over the next year Myriad in collaboration with other investigators isolated and sequenced the BRCA2 gene and identified relevant mutations and the first BRCA2 patent was filed in the U S by Myriad and the other institutions in 1995 41 Myriad is the exclusive licensee of these patents and has enforced them in the US against clinical diagnostic labs 45 This business model led from Myriad being a startup in 1994 to being a publicly traded company with 1200 employees and about 500M in annual revenue in 2012 44 it also led to controversy over high prices and the inability to get second opinions from other diagnostic labs which in turn led to the landmark Association for Molecular Pathology v Myriad Genetics lawsuit 45 119 The patents begin to expire in 2014 Peter Meldrum CEO of Myriad Genetics has acknowledged that Myriad has other competitive advantages that may make such patent enforcement unnecessary in Europe 120 Legal decisions surrounding the BRCA1 and BRCA2 patents will affect the field of genetic testing in general 121 In June 2013 in Association for Molecular Pathology v Myriad Genetics No 12 398 the US Supreme Court unanimously ruled that A naturally occurring DNA segment is a product of nature and not patent eligible merely because it has been isolated invalidating Myriad s patents on the BRCA1 and BRCA2 genes However the Court also held that manipulation of a gene to create something not found in nature could still be eligible for patent protection 122 The Federal Court of Australia came to the opposite conclusion upholding the validity of an Australian Myriad Genetics patent over the BRCA1 gene in February 2013 123 but this decision is being appealed and the appeal will include consideration of the US Supreme Court ruling 124 References Edit a b c GRCh38 Ensembl release 89 ENSG00000139618 Ensembl May 2017 a b c GRCm38 Ensembl release 89 ENSMUSG00000041147 Ensembl May 2017 Human PubMed Reference National Center for Biotechnology Information U S National Library of Medicine Mouse PubMed Reference National Center for Biotechnology Information U S National Library of Medicine Hamel PJ 2007 05 29 BRCA1 and BRCA2 No Longer the Only Troublesome Genes Out There HealthCentral Retrieved 2010 07 02 OrthoMaM phylogenetic marker BRCA2 coding sequence Archived from the original on 2016 03 03 Retrieved 2010 02 19 BRCA2 gene tree Ensembl May 2021 Duncan JA Reeves JR Cooke TG October 1998 BRCA1 and BRCA2 proteins roles in health and disease Molecular Pathology 51 5 237 47 doi 10 1136 mp 51 5 237 PMC 395646 PMID 10193517 Yoshida K Miki Y November 2004 Role of BRCA1 and BRCA2 as regulators of DNA repair transcription and cell cycle in response to DNA damage Cancer Science 95 11 866 71 doi 10 1111 j 1349 7006 2004 tb02195 x PMID 15546503 S2CID 24297965 Check W 2006 09 01 BRCA What we know now College of American Pathologists Retrieved 2010 08 23 Friedenson B August 2007 The BRCA1 2 pathway prevents hematologic cancers in addition to breast and ovarian cancers BMC Cancer 7 1 152 162 doi 10 1186 1471 2407 7 152 PMC 1959234 PMID 17683622 Friedenson B 2008 06 08 Breast cancer genes protect against some leukemias and lymphomas video SciVee Breast and Ovarian Cancer Genetic Screening Palo Alto Medical Foundation Archived from the original on 4 October 2008 Retrieved 2008 10 11 Friedenson B 2007 The BRCA1 2 pathway prevents hematologic cancers in addition to breast and ovarian cancers BMC Cancer 7 1 152 doi 10 1186 1471 2407 7 152 PMC 1959234 PMID 17683622 O Donovan PJ Livingston DM April 2010 BRCA1 and BRCA2 breast ovarian cancer susceptibility gene products and participants in DNA double strand break repair Carcinogenesis 31 6 961 7 doi 10 1093 carcin bgq069 PMID 20400477 a b Wooster R Neuhausen SL Mangion J Quirk Y Ford D Collins N Nguyen K Seal S Tran T Averill D September 1994 Localization of a breast cancer susceptibility gene BRCA2 to chromosome 13q12 13 Science 265 5181 2088 90 Bibcode 1994Sci 265 2088W doi 10 1126 science 8091231 PMID 8091231 BRCA2 breast cancer 2 early onset Homo sapiens EntrezGene National Center for Biotechnology Information U S National Library of Medicine Breast cancer type 2 susceptibility protein Homo sapiens Human P51587 UniProt Williams Jones B 2002 Genetic testing for sale Implications of commercial brca testing in Canada Ph D The University of British Columbia D Andrea AD 2010 Susceptibility pathways in Fanconi s anemia and breast cancer N Engl J Med 362 20 1909 19 doi 10 1056 NEJMra0809889 PMC 3069698 PMID 20484397 Sobeck A Stone S Landais I de Graaf B Hoatlin ME 2009 The Fanconi anemia protein FANCM is controlled by FANCD2 and the ATR ATM pathways J Biol Chem 284 38 25560 8 doi 10 1074 jbc M109 007690 PMC 2757957 PMID 19633289 Castillo P Bogliolo M Surralles J 2011 Coordinated action of the Fanconi anemia and ataxia telangiectasia pathways in response to oxidative damage DNA Repair Amst 10 5 518 25 doi 10 1016 j dnarep 2011 02 007 PMID 21466974 Stolz A Ertych N Bastians H 2011 Tumor suppressor CHK2 regulator of DNA damage response and mediator of chromosomal stability Clin Cancer Res 17 3 401 5 doi 10 1158 1078 0432 CCR 10 1215 PMID 21088254 Taniguchi T Garcia Higuera I Andreassen PR Gregory RC Grompe M D Andrea AD 2002 S phase specific interaction of the Fanconi anemia protein 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Mirzaa G Amemiya A eds GeneReviews University of Washington Seattle PMID 20301425 Levin B Lech D Friedenson B 2012 Evidence that BRCA1 or BRCA2 associated cancers are not inevitable Molecular Medicine 18 9 1327 37 doi 10 2119 molmed 2012 00280 PMC 3521784 PMID 22972572 High Penetrance Breast and or Ovarian Cancer Susceptibility Genes National Cancer Institute Retrieved 7 December 2012 Wooster R Bignell G Lancaster J Swift S Seal S Mangion J et al 1995 Identification of the breast cancer susceptibility gene BRCA2 Nature 378 6559 789 792 Bibcode 1995Natur 378 789W doi 10 1038 378789a0 PMID 8524414 S2CID 4346791 High Impact Science Tracking down the BRCA genes Part 2 Cancer Research UK science blog 2012 Kenneth Offit Breast Cancer Research Foundation BCRF Bcrfcure org 23 June 2014 Retrieved 2015 07 16 A revolution at 50 kenneth offit The New York Times 2003 02 25 ISSN 0362 4331 Retrieved 2015 07 02 20 Years of Progress in Understanding Breast Cancer JPG Mskcc org Retrieved 2015 07 17 Kolata G 1996 10 02 2d Breast Cancer Gene Found in Jewish Women The New York Times ISSN 0362 4331 Retrieved 2015 07 07 a b US patent 5837492 Tavtigian SV Kamb A Simard J Couch F Rommens JM Weber BL Chromosome 13 linked breast cancer susceptibility gene issued 1998 11 17 assigned to Myriad Genetics Inc Endo Recherche Inc HSC Research amp Development Limited Partnership Trustees of the University of Pennsylvania a b US patent 5747282 Skolnick HS Goldgar DE Miki Y Swenson J Kamb A Harshman KD Shattuck Eidens DM Tavtigian SV Wiseman RW Futreal PA 7Q linked breast and ovarian cancer susceptibility gene issued 1998 05 05 assigned to Myriad Genetics Inc The United States of America as represented by the Secretary of Health and Human Services and University of Utah Research Foundation US patent 5837492 Tavtigian SV Kamb A Simard J Couch F Rommens JM Weber BL Chromosome 13 linked breast cancer susceptibility gene issued 1998 11 17 assigned to Myriad Genetics Inc Endo Recherche Inc HSC Research 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48 Bibcode 2002Sci 297 1837Y doi 10 1126 science 297 5588 1837 PMID 12228710 Preobrazhenska O Yakymovych M Kanamoto T Yakymovych I Stoika R Heldin CH Souchelnytskyi S August 2002 BRCA2 and Smad3 synergize in regulation of gene transcription Oncogene 21 36 5660 4 doi 10 1038 sj onc 1205732 PMID 12165866 Bork P Blomberg N Nilges M May 1996 Internal repeats in the BRCA2 protein sequence Nat Genet 13 1 22 3 doi 10 1038 ng0596 22 PMID 8673099 S2CID 2312211 Alagar S Bahadur R P 2020 DSS1 allosterically regulates the conformation of the tower domain of BRCA2 that has dsDNA binding specificity for homologous recombination International Journal of Biological Macromolecules 165 Pt A 918 929 doi 10 1016 j ijbiomac 2020 09 230 PMID 33011260 S2CID 222165754 ACLU sues over patents on breast cancer genes CNN Archived from the original on 15 May 2009 Retrieved 2009 05 14 Conley J Vorhous D Cook Deegan J 2011 03 01 How Will Myriad Respond to the Next Generation of BRCA Testing Robinson Bradshaw and Hinson Retrieved 2012 12 09 Genetics and Patenting Human Genome Project Information U S Department of Energy Genome Programs 2010 07 07 Liptak A 13 June 2013 Supreme Court Rules Human Genes May Not Be Patented New York Times Retrieved 13 June 2013 Corderoy A February 15 2013 Landmark patent ruling over breast cancer gene BRCA1 Sydney Morning Herald Retrieved June 14 2013 Corderoy A June 14 2013 Companies can t patent genes US court rules Sydney Morning Herald Retrieved June 14 2013 Further reading Edit Zou JP Hirose Y Siddique H Rao VN Reddy ES 1999 Structure and expression of variant BRCA2a lacking the transactivation domain Oncology Reports 6 2 437 40 doi 10 3892 or 6 2 437 PMID 10023017 Venkitaraman AR 2001 Chromosome stability DNA recombination and the BRCA2 tumour suppressor Current Opinion in Cell Biology 13 3 338 43 doi 10 1016 S0955 0674 00 00217 9 PMID 11343905 Orelli BJ Bishop DK 2001 BRCA2 and homologous recombination Breast Cancer Research 3 5 294 8 doi 10 1186 bcr310 PMC 138691 PMID 11597317 Daniel DC 2002 Highlight BRCA1 and BRCA2 proteins in breast cancer Microscopy Research and Technique 59 1 68 83 doi 10 1002 jemt 10178 PMID 12242698 S2CID 30091586 Tutt A Ashworth A 2003 The relationship between the roles of BRCA genes in DNA repair and cancer predisposition Trends in Molecular Medicine 8 12 571 6 doi 10 1016 S1471 4914 02 02434 6 PMID 12470990 Goncalves A Viens P Sobol H Maraninchi D Bertucci F 2005 Molecular alterations in breast cancer clinical implications and new analytical tools Revue de Medecine Interne 26 6 470 8 doi 10 1016 j revmed 2004 11 012 PMID 15936476 Hay T Clarke AR 2005 DNA damage hypersensitivity in cells lacking BRCA2 a review of in vitro and in vivo data Biochemical Society Transactions 33 Pt 4 715 7 doi 10 1042 BST0330715 PMID 16042582 Domchek SM Weber BL 2006 Clinical management of BRCA1 and BRCA2 mutation carriers Oncogene 25 43 5825 31 doi 10 1038 sj onc 1209881 PMID 16998496 Honrado E Osorio A Palacios J Benitez J 2006 Pathology and gene expression of hereditary breast tumors associated with BRCA1 BRCA2 and CHEK2 gene mutations Oncogene 25 43 5837 45 doi 10 1038 sj onc 1209875 PMID 16998498 S2CID 20960561 External links Edit BRCA2 Protein at the U S National Library of Medicine Medical Subject Headings MeSH This article incorporates text from the public domain Pfam and InterPro IPR002093 This article incorporates text from the public domain Pfam and InterPro IPR015252 This article incorporates text from the public domain Pfam and InterPro IPR015187 This article incorporates text from the public domain Pfam and InterPro IPR015205 Retrieved from https en wikipedia org w index php title BRCA2 amp oldid 1174808501, wikipedia, wiki, book, books, library,

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