which chromosome is the gene for FAP found on
Three variants are known to exist, FAP and attenuated FAP (originally called âhereditary flat adenoma syndrome) are caused by APC gene defects and autosomal recessive FAP (or MYH-associated polyposis) is caused by MUTYH gene defects.nternational polyposis registries exists that track known cases of FAP or APC gene defects, for research and clinical purposes. Mutation of APC also occurs commonly in incident cases of colorectal carcinoma, emphasizing its importance in this form of cancer.