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- W4362014811 abstract "<div>Abstract<p>Germline loss-of-function mutations in BRCA1 interacting protein C-terminal helicase 1 (BRIP1) are associated with ovarian carcinoma and may also contribute to breast cancer risk, particularly among patients who develop disease at an early age. Normal BRIP1 activity is required for DNA interstrand cross-link (ICL) repair and is thus central to the maintenance of genome stability. Although pathogenic mutations have been identified in <i>BRIP1</i>, genetic testing more often reveals missense variants, for which the impact on molecular function and subsequent roles in cancer risk are uncertain. Next-generation sequencing of germline DNA in 2,160 early-onset breast cancer and 1,199 patients with ovarian cancer revealed nearly 2% of patients carry a very rare missense variant (minor allele frequency < 0.0001) in <i>BRIP1</i>. This is 3-fold higher than the frequency of all rare BRIP1 missense alleles reported in more than 60,000 individuals of the general population (<i>P</i> < 0.0001, <i>χ</i><sup>2</sup> test). Using CRISPR-Cas9 gene editing technology and rescue assays, we functionally characterized 20 of these missense variants, focusing on the altered protein's ability to repair ICL damage. A total of 75% of the characterized variants rendered the protein hypomorph or null. In a clinical cohort of >117,000 patients with breast and ovarian cancer who underwent panel testing, the combined OR associated with BRIP1 hypomorph or null missense carriers compared with the general population was 2.30 (95% confidence interval, 1.60–3.30; <i>P</i> < 0.0001). These findings suggest that novel missense variants within the helicase domain of BRIP1 may confer risk for both breast and ovarian cancer and highlight the importance of functional testing for additional variants.</p>Significance:<p>Functional characterization of rare variants of uncertain significance in <i>BRIP1</i> revealed that 75% demonstrate loss-of-function activity, suggesting rare missense alleles in <i>BRIP1</i> confer risk for both breast and ovarian cancer.</p></div>" @default.
- W4362014811 created "2023-04-05" @default.
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- W4362014811 date "2023-03-31" @default.
- W4362014811 modified "2023-09-23" @default.
- W4362014811 title "Data from Rare <i>BRIP1</i> Missense Alleles Confer Risk for Ovarian and Breast Cancer" @default.
- W4362014811 doi "https://doi.org/10.1158/0008-5472.c.6511902" @default.
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