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BRCA2 minor transcript lacking exons 4-7 supports viability in mice and may account for survival of humans with a pathogenic biallelic mutation.

Abstract：

:The breast cancer gene, BRCA2, is essential for viability, yet patients with Fanconi anemia-D1 subtype are born alive with biallelic mutations in this gene. The hypomorphic nature of the mutations is believed to support viability, but this is not always apparent. One such mutation is IVS7+2T>G, which causes premature protein truncation due to skipping of exon 7. We previously identified a transcript lacking exons 4-7, which restores the open-reading frame, encodes a DNA repair proficient protein and is expressed in IVS7+2T>G carriers. However, because the exons 4-7 encoded region contains several residues required for normal cell-cycle regulation and cytokinesis, this transcript's ability to support viability can be argued. To address this, we generated a Brca2 knock-in mouse model lacking exons 4-7 and demonstrated that these exons are dispensable for viability as well as tumor-free survival. This study provides the first in vivo evidence of the functional significance of a minor transcript of BRCA2 that can play a major role in the survival of humans who are homozygous for a clearly pathogenic mutation. Our results highlight the importance of assessing protein function restoration by premature truncating codon bypass by alternative splicing when evaluating the functional significance of variants such as nonsense and frame-shift mutations that are assumed to be clearly pathogenic. Our findings will impact not only the assessment of variants that map to this region, but also influence counseling paradigms and treatment options for such mutation carriers.

journal_name

Hum Mol Genet

journal_title

Human molecular genetics

authors

Thirthagiri E,Klarmann KD,Shukla AK,Southon E,Biswas K,Martin BK,North SL,Magidson V,Burkett S,Haines DC,Noer K,Matthai R,Tessarollo L,Loncarek J,Keller JR,Sharan SK

doi

10.1093/hmg/ddw066

subject

Has Abstract

pub_date

2016-05-15 00:00:00

pages

1934-1945

issue

10

eissn

0964-6906

issn

1460-2083

pii

ddw066

journal_volume

25

pub_type

杂志文章

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