Digenic inheritance of MSH6 and MUTYH variants in familial colorectal cancer

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Abstract

We describe a family severely affected by colorectal cancer (CRC) where whole-exome sequencing identified the coinheritance of the germline variants encoding MSH6 p.Thr1100Met and MUTYH p.Tyr179Cys in, at least, three CRC patients diagnosed before 60 years of age. Digenic inheritance of monoallelic MSH6 variants of uncertain significance and MUTYH variants has been suggested to predispose to Lynch syndrome-associated cancers; however, cosegregation with disease in the familial setting has not yet been established. The identification of individuals carrying multiple potential cancer risk variants is expected to rise with the increased application of whole-genome sequencing and large multigene panel testing in clinical genetic counseling of familial cancer patients. Here we demonstrate the coinheritance of monoallelic variants in MSH6 and MUTYH consistent with cosegregation with CRC, further supporting a role for digenic inheritance in cancer predisposition.

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APA

Schubert, S. A., Ruano, D., Tiersma, Y., Drost, M., de Wind, N., Nielsen, M., … van Wezel, T. (2020). Digenic inheritance of MSH6 and MUTYH variants in familial colorectal cancer. Genes Chromosomes and Cancer, 59(12), 697–701. https://doi.org/10.1002/gcc.22883

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