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Familial Cancer 24, 13 (2025), Dec 19, 2024
PMID: 39702679
Lynch syndrome (LS) is an autosomal dominant hereditary cancer predisposition syndrome whereby the lifetime risk of developing gastrointestinal and genitourinary cancers rises by to over 50%. It is caused by heterozygous variants in the DNA mismatch repair genes- MLH1, MSH2, MSH6 and PMS2, with the majority detected in MLH1 and MSH2. Recurrently observed LS-associated variants in apparently unrelated individuals have either arisen de novo in different families due to mutation hotspots or are inherited from a common ancestor (founder) that lived several generations back. Testing for founder variants can facilitate molecular diagnosis of LS more efficiently and cost effectively than screening for all possible variants in the MMR genes.
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