Massively parallel functional testing of MSH2 missense variants conferring Lynch syndrome risk

The lack of functional evidence for the majority of missense variants limits their clinical interpretability and poses a key barrier to the broad utility of carrier screening. In Lynch syndrome (LS), one of the most highly prevalent cancer syndromes, nearly 90% of clinically observed missense varian...

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Veröffentlicht in:American journal of human genetics 2021-01, Vol.108 (1), p.163-175
Hauptverfasser: Jia, Xiaoyan, Burugula, Bala Bharathi, Chen, Victor, Lemons, Rosemary M., Jayakody, Sajini, Maksutova, Mariam, Kitzman, Jacob O.
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container_issue 1
container_start_page 163
container_title American journal of human genetics
container_volume 108
creator Jia, Xiaoyan
Burugula, Bala Bharathi
Chen, Victor
Lemons, Rosemary M.
Jayakody, Sajini
Maksutova, Mariam
Kitzman, Jacob O.
description The lack of functional evidence for the majority of missense variants limits their clinical interpretability and poses a key barrier to the broad utility of carrier screening. In Lynch syndrome (LS), one of the most highly prevalent cancer syndromes, nearly 90% of clinically observed missense variants are deemed “variants of uncertain significance” (VUS). To systematically resolve their functional status, we performed a massively parallel screen in human cells to identify loss-of-function missense variants in the key DNA mismatch repair factor MSH2. The resulting functional effect map is substantially complete, covering 94% of the 17,746 possible variants, and is highly concordant (96%) with existing functional data and expert clinicians’ interpretations. The large majority (89%) of missense variants were functionally neutral, perhaps unexpectedly in light of its evolutionary conservation. These data provide ready-to-use functional evidence to resolve the ∼1,300 extant missense VUSs in MSH2 and may facilitate the prospective classification of newly discovered variants in the clinic.
doi_str_mv 10.1016/j.ajhg.2020.12.003
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subjects cancer
Colorectal Neoplasms, Hereditary Nonpolyposis - genetics
deep mutational scanning
DNA mismatch repair
DNA Mismatch Repair - genetics
Genetic Predisposition to Disease - genetics
genotype-phenotype
HEK293 Cells
Humans
Lynch syndrome
MSH2
Mutation, Missense - genetics
MutS Homolog 2 Protein - genetics
variants of uncertain significance
title Massively parallel functional testing of MSH2 missense variants conferring Lynch syndrome risk
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