MLH1, a Longevity Gene
The gene MLH1 "provides instructions for making a protein that plays an essential role in DNA repair. This protein fixes mistakes that are made when DNA is copied (DNA replication) in preparation for cell division." From the abstract: "MLH1 is a mismatch repair enzyme that acts to maintain genomic stability, and a loss of MLH1 increases cancer incidence and apoptosis resistance, which suggests a link between MLH1 and longevity. We found here that MLH1 is associated with longevity by comparing a centenarian group with a control group. Our data indicate a critical role for MLH1 in longevity." DNA damage (or mutation) is one of the underlying causes of age-related degeneration, so it would be expected that absent MLH1 reduces longevity. This paper demonstrates that more is better, however, and thus many people could have a more efficient biochemistry in this regard.