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Hereditary nonpolyposis colorectal cancer (HNPCC) is a hereditary predisposition to colon cancer.. HNPCC includes (and was once synonymous with) [1] Lynch syndrome, an autosomal dominant genetic condition that is associated with a high risk of colon cancer, endometrial cancer (second most common), ovary, stomach, small intestine, hepatobiliary tract, upper urinary tract, brain, and skin. [2]
Under the name constitutional mismatch repair-deficiency (CMMR-D), it has been mapped to MLH1, MSH2, MSH6 or PMS2. [2] Monoallelic mutations of these genes are observed in the condition known as Lynch syndrome or hereditary nonpolyposis colorectal cancer, while biallelic mutations are observed in CMMR-D. [3] People expressing the HNPCC (which itself is considered autosomal dominant) trait are ...
Variants in this gene can cause hereditary nonpolyposis colon cancer (Lynch syndrome). It is a human homolog of the E. coli DNA mismatch repair gene, mutL, which mediates protein-protein interactions during mismatch recognition, strand discrimination, and strand removal.
Muir–Torre syndrome is a rare hereditary, autosomal dominant cancer syndrome [1]: 663 that is thought to be a subtype of HNPCC (Lynch syndrome). Individuals are prone to develop cancers of the colon, genitourinary tract, and skin lesions, such as keratoacanthomas and sebaceous tumors .
In 1997, the National Cancer Institute published a set of recommendations called the Bethesda guidelines for the identification of individuals who should receive genetic testing for Lynch syndrome related tumors. [6] The NCI revisited and revised these criteria in 2004. [7] The Revised Bethesda Guidelines are as follows:
A genetic blood test of the APC gene exists that can determine whether it is present, and therefore can predict the possibility of FAP. Individuals at risk (due to family links or genetic testing) are usually offered routine monitoring of the intestinal tract every 1–3 years for life, from puberty for FAP and early adulthood for attenuated forms.
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MUTYH-associated polyposis (also known as MYH-associated polyposis) is an autosomal recessive polyposis syndrome. [1] The disorder is caused by mutations in both alleles (genetic copies) of the DNA repair gene, MUTYH. The MUTYH gene encodes a base excision repair protein, which corrects oxidative damage to DNA.