We screened for germ-line MYH mutations in 152 patients with multiple (3 to 100) colorectal adenomas and 107 APC-mutation-negative probands with classic familial adenomatous polyposis (>100 adenomas).
Recessively inherited mutations in the base excision repair gene MYH have recently been associated with predisposition to colorectal adenomas and cancer in materials selected for occurrence of multiple adenomas.
Very recently, germline mutations in the base-excision repair gene MYH have been associated with recessive inheritance of multiple colorectal adenomas in a subset of patients.
Inherited mutations in MYH predispose to colorectal adenomas and carcinomas that show a characteristic pattern of somatic G:C-->T:A mutations in the APC gene.
The MYH gene encodes a DNA glycosylase involved in the excision repair of adenines paired with 8-hydroxyguanines, a major component of oxidative DNA damage, and bi-allelic germline MYH mutations have been reported to predispose individuals to multiple colorectal adenomas and carcinoma.
Biallelic germ-line variants of the 8-hydroxyguanine repair gene MYH have been associated with multiple colorectal adenomas that display somatic G:C-->T:A transversions in APC.
Polyposis associated with mutations in the gene MUTYH is an autosomal recessive syndrome characterised by the development of multiple colorectal adenomas and cancer.
Prevalence of the Y165C, G382D and 1395delGGA germline mutations of the MYH gene in Italian patients with adenomatous polyposis coli and colorectal adenomas.
In this study, screening for germinal mutations in the MYH gene was performed in 53 Portuguese individuals with multiple colorectal adenomas or classic adenomatous polyposis, in whom no mutation had been identified in the APC gene.
Biallelic germline mutations in the base excision repair gene MYH have been shown to predispose to a proportion of multiple colorectal adenomas and cancer.
MAP (MutYH-associated polyposis) is a recently described colorectal adenoma and carcinoma predisposition syndrome that is associated with biallelic-inherited mutations of the human MutY homologue gene, MutYH.MutYH is often also termed MYH.
The expression of MYH, MSH2, MLH1, and MSH6 proteins was studied by immunohistochemistry in 20 samples (colorectal adenomas or cancer) from 18 patients with biallelic MYH mutation, in 11 samples from patients with germline adenomatous polyposis coli (APC) mutations, in 20 samples from patients with sporadic colorectal cancers, and in 10 samples from patients with normal colonic mucosa without malignancies.
We describe a simple tetra-primer amplification refractory mutation system PCR (T-ARMS-PCR) for detecting MUTYH mutations, which are associated with colorectal adenomas and colorectal cancer.
Mutation in MYH may be rarely involved in the pathogenesis of multiple sporadic colorectal adenomas in Korean population, although a large-scale analysis will be required to clarify the presence of specific MYH variants in a subset of patients and their role in the predisposition of multiple colorectal adenomas in Korean population.
Conclusively, two novel mutations of MYH and a novel OGG1 polymorphism seemed to be associated with multiple colorectal adenomas in Korean families, differing from those in other ethnic groups.
We conclude that MUTYH suppresses spontaneous tumorigenesis in mammals, thus providing experimental evidence for the association between biallelic germ-line MUTYH mutations and a recessive form of human hereditary colorectal adenoma and carcinoma.