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Gene variation predicts rate of age-related decline in mental performance, Stanford study
Date:10/25/2011

STANFORD, Calif. - A tiny difference in the coding pattern of a single gene significantly affects the rate at which men's intellectual function drops with advancing age, investigators at the Stanford University School of Medicine and the Veterans Affairs Palo Alto Health Care System have learned.

In a study to be published online Oct. 25 in Translational Psychiatry, the researchers tested the skills of experienced airplane pilots and found that having one version of the gene versus the other version doubled the rate at which the participants' performance declined over time.

The particular genetic variation, or polymorphism, implicated in the study has been linked in previous studies to several psychiatric disorders. But this is the first demonstration of its impact on skilled task performance in the healthy, aging brain, said the study's senior author, Ahmad Salehi, MD, PhD, clinical associate professor of psychiatry and behavioral sciences at Stanford.

The study also showed a significant age-related decline in the size of a key brain region called the hippocampus, which is crucial to memory and spatial reasoning, in pilots carrying this polymorphism.

"This gene-associated difference may apply not only to pilots but also to the general public, for example in the ability to operate complex machinery," said Salehi, who is also a health-science specialist at the VA-Palo Alto.

The gene in question codes for a well-studied protein called brain-derived neurotropic factor, or BDNF, which is critical to the development and maintenance of the central nervous system. BDNF levels decline gradually with age even in healthy individuals; researchers such as Salehi have suspected that this decline may be linked with age-related losses of mental function.

Genes, which are blueprints for proteins, are linear sequences of DNA composed of four different chemical units all connected like beads on a string. The most commo
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Contact: Bruce Goldman
goldmanb@stanford.edu
650-725-2106
Stanford University Medical Center
Source:Eurekalert

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