August 17, 2005
Gene is found affecting the aging processTopics: Medicine
[Right image: 8-month-old normal(top) and p63 deficient mice. (Alea Mills, Cold Spring Harbor Laboratory)]
Researchers report the loss of a gene called p63 accelerates aging in mice, with similar genes present in many organisms, including humans.
The scientists say mice born without the p63 gene do not survive. In previous studies, Alea Mills of Cold Spring Harbor Laboratory, found mice born with only one copy of the gene die at a young age.
To study p63 function in adult mice, Mills and colleagues devised a sophisticated molecular genetic technique enabling them to eliminate both copies of the gene from particular tissues after the animals reached maturity.
The effects of premature aging observed in the p63 deficient mice included hair loss, reduced fitness and shortened lifespan.
"Aging and cancer are two sides of the same coin," said Mills. "In one case, cells stop dividing and in the other, they can't stop dividing. We suspect having the right amount of the p63 protein in the right cells at the right time creates a balance that enables organisms to live relatively cancer-free for a reasonably long time." The study appears in the journal Genes & Development.
A note on perspective is in order here. A lack of p63 accelerates aging in tissue - but so does a a great many other things. Although there's no such thing as useless information in the biochemistry and genetics of aging, it remains to be seen how important this new discovery actually turns out to be in the overall scheme of genetics, biochemistry, molecular biology, and the biological environment. As important as genetics are, biological systems and genetic expressions don't function in a controlled environment, and often, synergistic interaction of multiple factors can be more important than genetic predisposition.
Posted by Richard at August 17, 2005 9:36 PM
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