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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Complete genomic sequence and analysis of 117 kb of human DNA containing the gene BRCA1.

Over 100 distinct disease-associated mutations have been identified in the breast-ovarian cancer susceptibility gene BRCA1. Loss of the wild-type allele in > 90% of tumors from patients with inherited BRCA1 mutations indicates tumor suppressive function. The low incidence of somatic mutations suggests that BRCA1 inactivation in sporadic tumors occurs by alternative mechanisms, such as interstitial chromosomal deletion or reduced transcription. To identify possible features of the BRCA1 genomic region that may contribute to chromosomal instability as well as potential transcriptional regulatory elements, a 117,143-bp DNA sequence encompassing BRCA1 was obtained by random sequencing of four cosmids identified from a human chromosome 17 specific library. The 24 exons of BRCA1 span an 81-kb region that has an unusually high density of Alu repetitive DNA (41.5%), but relatively low density (4.8%) of other repetitive sequences. BRCA1 intron lengths range in size from 403 bp to 9.2 kb and contain the intragenic microsatellite markers D17S1323, D17S1322, and D17S855, which localize to introns 12, 19, and 20, respectively. In addition to BRCA1, the contig contains two complete genes: Rho7, a member of the rho family of GTP binding proteins, and VAT1, an abundant membrane protein of cholinergic synaptic vesicles. Partial sequences of the 1A1-3B B-box protein pseudogene and IFP 35, an interferon induced leucine zipper protein, reside within the contig. An L21 ribosomal protein pseudogene is embedded in BRCA1 intron 13. The order of genes on the chromosome is: centromere-1FP 35-VAT1-Rho7-BRCA1-1A1-3B-telomere.[1]

References

  1. Complete genomic sequence and analysis of 117 kb of human DNA containing the gene BRCA1. Smith, T.M., Lee, M.K., Szabo, C.I., Jerome, N., McEuen, M., Taylor, M., Hood, L., King, M.C. Genome Res. (1996) [Pubmed]
 
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