8r2g

Structural highlights

Disease

BRCA2_HUMAN Defects in BRCA2 are a cause of susceptibility to breast cancer (BC) [MIM:114480. A common malignancy originating from breast epithelial tissue. Breast neoplasms can be distinguished by their histologic pattern. Invasive ductal carcinoma is by far the most common type. Breast cancer is etiologically and genetically heterogeneous. Important genetic factors have been indicated by familial occurrence and bilateral involvement. Mutations at more than one locus can be involved in different families or even in the same case.^{[1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20]} Defects in BRCA2 are the cause of pancreatic cancer type 2 (PNCA2) [MIM:613347. It is a malignant neoplasm of the pancreas. Tumors can arise from both the exocrine and endocrine portions of the pancreas, but 95% of them develop from the exocrine portion, including the ductal epithelium, acinar cells, connective tissue, and lymphatic tissue.^[21] Defects in BRCA2 are a cause of susceptibility to familial breast-ovarian cancer type 2 (BROVCA2) [MIM:612555. A condition associated with familial predisposition to cancer of the breast and ovaries. Characteristic features in affected families are an early age of onset of breast cancer (often before age 50), increased chance of bilateral cancers (cancer that develop in both breasts, or both ovaries, independently), frequent occurrence of breast cancer among men, increased incidence of tumors of other specific organs, such as the prostate. Defects in BRCA2 are the cause of Fanconi anemia complementation group D type 1 (FANCD1) [MIM:605724. It is a disorder affecting all bone marrow elements and resulting in anemia, leukopenia and thrombopenia. It is associated with cardiac, renal and limb malformations, dermal pigmentary changes, and a predisposition to the development of malignancies. At the cellular level it is associated with hypersensitivity to DNA-damaging agents, chromosomal instability (increased chromosome breakage) and defective DNA repair.^{[22] [23] [24]} Defects in BRCA2 are a cause of glioma type 3 (GLM3) [MIM:613029. Gliomas are benign or malignant central nervous system neoplasms derived from glial cells. They comprise astrocytomas and glioblastoma multiforme that are derived from astrocytes, oligodendrogliomas derived from oligodendrocytes and ependymomas derived from ependymocytes.^[25]

Function

BRCA2_HUMAN Involved in double-strand break repair and/or homologous recombination. Binds RAD51 and potentiates recombinational DNA repair by promoting assembly of RAD51 onto single-stranded DNA (ssDNA). Acts by targeting RAD51 to ssDNA over double-stranded DNA, enabling RAD51 to displace replication protein-A (RPA) from ssDNA and stabilizing RAD51-ssDNA filaments by blocking ATP hydrolysis. May participate in S phase checkpoint activation. Binds selectively to ssDNA, and to ssDNA in tailed duplexes and replication fork structures. In concert with NPM1, regulates centrosome duplication.^{[26] [27] [28] [29] [30] [31] [32] [33]}

References

1. ↑ Xia B, Sheng Q, Nakanishi K, Ohashi A, Wu J, Christ N, Liu X, Jasin M, Couch FJ, Livingston DM. Control of BRCA2 cellular and clinical functions by a nuclear partner, PALB2. Mol Cell. 2006 Jun 23;22(6):719-29. PMID:16793542 doi:10.1016/j.molcel.2006.05.022
2. ↑ Miki Y, Katagiri T, Kasumi F, Yoshimoto T, Nakamura Y. Mutation analysis in the BRCA2 gene in primary breast cancers. Nat Genet. 1996 Jun;13(2):245-7. PMID:8640237 doi:10.1038/ng0696-245
3. ↑ Vehmanen P, Friedman LS, Eerola H, Sarantaus L, Pyrhonen S, Ponder BA, Muhonen T, Nevanlinna H. A low proportion of BRCA2 mutations in Finnish breast cancer families. Am J Hum Genet. 1997 May;60(5):1050-8. PMID:9150152
4. ↑ Ganguly T, Dhulipala R, Godmilow L, Ganguly A. High throughput fluorescence-based conformation-sensitive gel electrophoresis (F-CSGE) identifies six unique BRCA2 mutations and an overall low incidence of BRCA2 mutations in high-risk BRCA1-negative breast cancer families. Hum Genet. 1998 May;102(5):549-56. PMID:9654203
5. ↑ Katagiri T, Kasumi F, Yoshimoto M, Nomizu T, Asaishi K, Abe R, Tsuchiya A, Sugano M, Takai S, Yoneda M, Fukutomi T, Nanba K, Makita M, Okazaki H, Hirata K, Okazaki M, Furutsuma Y, Morishita Y, Iino Y, Karino T, Ayabe H, Hara S, Kajiwara T, Houga S, Miki Y, et al.. High proportion of missense mutations of the BRCA1 and BRCA2 genes in Japanese breast cancer families. J Hum Genet. 1998;43(1):42-8. PMID:9609997 doi:10.1007/s100380050035
6. ↑ Wagner TM, Hirtenlehner K, Shen P, Moeslinger R, Muhr D, Fleischmann E, Concin H, Doeller W, Haid A, Lang AH, Mayer P, Petru E, Ropp E, Langbauer G, Kubista E, Scheiner O, Underhill P, Mountain J, Stierer M, Zielinski C, Oefner P. Global sequence diversity of BRCA2: analysis of 71 breast cancer families and 95 control individuals of worldwide populations. Hum Mol Genet. 1999 Mar;8(3):413-23. PMID:9971877
7. ↑ Sinilnikova OM, Egan KM, Quinn JL, Boutrand L, Lenoir GM, Stoppa-Lyonnet D, Desjardins L, Levy C, Goldgar D, Gragoudas ES. Germline brca2 sequence variants in patients with ocular melanoma. Int J Cancer. 1999 Jul 30;82(3):325-8. PMID:10399947
8. ↑ Plaschke J, Commer T, Jacobi C, Schackert HK, Chang-Claude J. BRCA2 germline mutations among early onset breast cancer patients unselected for family history of the disease. J Med Genet. 2000 Sep;37(9):E17. PMID:10978364
9. ↑ Kwiatkowska E, Teresiak M, Lamperska KM, Karczewska A, Breborowicz D, Stawicka M, Godlewski D, Krzyzosiak WJ, Mackiewicz A. BRCA2 germline mutations in male breast cancer patients in the Polish population. Hum Mutat. 2001;17(1):73. PMID:11139248 doi:<73::AID-HUMU12>3.0.CO;2-O 10.1002/1098-1004(2001)17:1<73::AID-HUMU12>3.0.CO;2-O
10. ↑ Edwards SM, Kote-Jarai Z, Hamoudi R, Eeles RA. An improved high throughput heteroduplex mutation detection system for screening BRCA2 mutations-fluorescent mutation detection (F-MD). Hum Mutat. 2001 Mar;17(3):220-32. PMID:11241844 doi:10.1002/humu.7
11. ↑ Fackenthal JD, Cartegni L, Krainer AR, Olopade OI. BRCA2 T2722R is a deleterious allele that causes exon skipping. Am J Hum Genet. 2002 Sep;71(3):625-31. Epub 2002 Jul 19. PMID:12145750 doi:S0002-9297(07)60342-5
12. ↑ Jakubowska A, Nej K, Huzarski T, Scott RJ, Lubinski J. BRCA2 gene mutations in families with aggregations of breast and stomach cancers. Br J Cancer. 2002 Oct 7;87(8):888-91. PMID:12373604 doi:10.1038/sj.bjc.6600562
13. ↑ Zhi X, Szabo C, Chopin S, Suter N, Wang QS, Ostrander EA, Sinilnikova OM, Lenoir GM, Goldgar D, Shi YR. BRCA1 and BRCA2 sequence variants in Chinese breast cancer families. Hum Mutat. 2002 Dec;20(6):474. PMID:12442274 doi:10.1002/humu.9083
14. ↑ Ruiz-Flores P, Sinilnikova OM, Badzioch M, Calderon-Garciduenas AL, Chopin S, Fabrice O, Gonzalez-Guerrero JF, Szabo C, Lenoir G, Goldgar DE, Barrera-Saldana HA. BRCA1 and BRCA2 mutation analysis of early-onset and familial breast cancer cases in Mexico. Hum Mutat. 2002 Dec;20(6):474-5. PMID:12442275 doi:10.1002/humu.9084
15. ↑ Kwiatkowska E, Teresiak M, Breborowicz D, Mackiewicz A. Somatic mutations in the BRCA2 gene and high frequency of allelic loss of BRCA2 in sporadic male breast cancer. Int J Cancer. 2002 Apr 20;98(6):943-5. PMID:11948477
16. ↑ Meyer P, Voigtlaender T, Bartram CR, Klaes R. Twenty-three novel BRCA1 and BRCA2 sequence alterations in breast and/or ovarian cancer families in Southern Germany. Hum Mutat. 2003 Sep;22(3):259. PMID:12938098 doi:http://dx.doi.org/10.1002/humu.9174
17. ↑ Claes K, Poppe B, Coene I, Paepe AD, Messiaen L. BRCA1 and BRCA2 germline mutation spectrum and frequencies in Belgian breast/ovarian cancer families. Br J Cancer. 2004 Mar 22;90(6):1244-51. PMID:15026808 doi:10.1038/sj.bjc.6601656
18. ↑ Hadjisavvas A, Charalambous E, Adamou A, Neuhausen SL, Christodoulou CG, Kyriacou K. Hereditary breast and ovarian cancer in Cyprus: identification of a founder BRCA2 mutation. Cancer Genet Cytogenet. 2004 Jun;151(2):152-6. PMID:15172753 doi:10.1016/j.cancergencyto.2003.09.020
19. ↑ Valarmathi MT, Sawhney M, Deo SS, Shukla NK, Das SN. Novel germline mutations in the BRCA1 and BRCA2 genes in Indian breast and breast-ovarian cancer families. Hum Mutat. 2004 Feb;23(2):205. PMID:14722926 doi:10.1002/humu.9213
20. ↑ Seo JH, Cho DY, Ahn SH, Yoon KS, Kang CS, Cho HM, Lee HS, Choe JJ, Choi CW, Kim BS, Shin SW, Kim YH, Kim JS, Son GS, Lee JB, Koo BH. BRCA1 and BRCA2 germline mutations in Korean patients with sporadic breast cancer. Hum Mutat. 2004 Oct;24(4):350. PMID:15365993 doi:10.1002/humu.9275
21. ↑ Ozcelik H, Schmocker B, Di Nicola N, Shi XH, Langer B, Moore M, Taylor BR, Narod SA, Darlington G, Andrulis IL, Gallinger S, Redston M. Germline BRCA2 6174delT mutations in Ashkenazi Jewish pancreatic cancer patients. Nat Genet. 1997 May;16(1):17-8. PMID:9140390 doi:10.1038/ng0597-17
22. ↑ Howlett NG, Taniguchi T, Olson S, Cox B, Waisfisz Q, De Die-Smulders C, Persky N, Grompe M, Joenje H, Pals G, Ikeda H, Fox EA, D'Andrea AD. Biallelic inactivation of BRCA2 in Fanconi anemia. Science. 2002 Jul 26;297(5581):606-9. Epub 2002 Jun 13. PMID:12065746 doi:10.1126/science.1073834
23. ↑ Hirsch B, Shimamura A, Moreau L, Baldinger S, Hag-alshiekh M, Bostrom B, Sencer S, D'Andrea AD. Association of biallelic BRCA2/FANCD1 mutations with spontaneous chromosomal instability and solid tumors of childhood. Blood. 2004 Apr 1;103(7):2554-9. Epub 2003 Dec 11. PMID:14670928 doi:10.1182/blood-2003-06-1970
24. ↑ Alter BP, Rosenberg PS, Brody LC. Clinical and molecular features associated with biallelic mutations in FANCD1/BRCA2. J Med Genet. 2007 Jan;44(1):1-9. Epub 2006 Jul 6. PMID:16825431 doi:jmg.2006.043257
25. ↑ Reid S, Renwick A, Seal S, Baskcomb L, Barfoot R, Jayatilake H, Pritchard-Jones K, Stratton MR, Ridolfi-Luthy A, Rahman N. Biallelic BRCA2 mutations are associated with multiple malignancies in childhood including familial Wilms tumour. J Med Genet. 2005 Feb;42(2):147-51. PMID:15689453 doi:10.1136/jmg.2004.022673
26. ↑ Hussain S, Wilson JB, Medhurst AL, Hejna J, Witt E, Ananth S, Davies A, Masson JY, Moses R, West SC, de Winter JP, Ashworth A, Jones NJ, Mathew CG. Direct interaction of FANCD2 with BRCA2 in DNA damage response pathways. Hum Mol Genet. 2004 Jun 15;13(12):1241-8. Epub 2004 Apr 28. PMID:15115758 doi:10.1093/hmg/ddh135
27. ↑ Wang X, Andreassen PR, D'Andrea AD. Functional interaction of monoubiquitinated FANCD2 and BRCA2/FANCD1 in chromatin. Mol Cell Biol. 2004 Jul;24(13):5850-62. PMID:15199141 doi:10.1128/MCB.24.13.5850-5862.2004
28. ↑ Ohashi A, Zdzienicka MZ, Chen J, Couch FJ. Fanconi anemia complementation group D2 (FANCD2) functions independently of BRCA2- and RAD51-associated homologous recombination in response to DNA damage. J Biol Chem. 2005 Apr 15;280(15):14877-83. Epub 2005 Jan 25. PMID:15671039 doi:M414669200
29. ↑ Bahassi EM, Ovesen JL, Riesenberg AL, Bernstein WZ, Hasty PE, Stambrook PJ. The checkpoint kinases Chk1 and Chk2 regulate the functional associations between hBRCA2 and Rad51 in response to DNA damage. Oncogene. 2008 Jun 26;27(28):3977-85. doi: 10.1038/onc.2008.17. Epub 2008 Mar 3. PMID:18317453 doi:10.1038/onc.2008.17
30. ↑ Liu J, Doty T, Gibson B, Heyer WD. Human BRCA2 protein promotes RAD51 filament formation on RPA-covered single-stranded DNA. Nat Struct Mol Biol. 2010 Oct;17(10):1260-2. doi: 10.1038/nsmb.1904. Epub 2010, Aug 22. PMID:20729859 doi:10.1038/nsmb.1904
31. ↑ Thorslund T, McIlwraith MJ, Compton SA, Lekomtsev S, Petronczki M, Griffith JD, West SC. The breast cancer tumor suppressor BRCA2 promotes the specific targeting of RAD51 to single-stranded DNA. Nat Struct Mol Biol. 2010 Oct;17(10):1263-5. doi: 10.1038/nsmb.1905. Epub 2010, Aug 22. PMID:20729858 doi:10.1038/nsmb.1905
32. ↑ Jensen RB, Carreira A, Kowalczykowski SC. Purified human BRCA2 stimulates RAD51-mediated recombination. Nature. 2010 Oct 7;467(7316):678-83. doi: 10.1038/nature09399. PMID:20729832 doi:10.1038/nature09399
33. ↑ Wang HF, Takenaka K, Nakanishi A, Miki Y. BRCA2 and nucleophosmin coregulate centrosome amplification and form a complex with the Rho effector kinase ROCK2. Cancer Res. 2011 Jan 1;71(1):68-77. doi: 10.1158/0008-5472.CAN-10-0030. Epub 2010, Nov 16. PMID:21084279 doi:10.1158/0008-5472.CAN-10-0030