MUTYH and attenuated familial adenomatous polyposis: Monoallelic pathogenic variants in genes associated with autosomal recessive conditions, including MUTYH-associated polyposis (familial adenomatous polyposis-2, FAP2; MIM: 608456) and Fanconi anaemia, complementation group I (FA; MIM: 609053), accounted for the remaining 10.0%.