Understanding the Implications
The stressful life events led to onset of new depression among people with one
or two copies of the short gene variant who didn't have depression before the
events happened. The events failed to predict a diagnosis of new depression among
those with two copies of the long variant. Among those who had experienced
multiple stressful events, 11 percent with the short variant thought about or
attempted suicide, compared to 4 percent with two copies of the long variant.
These self-reports were corroborated by reports from participants' loved ones.
The researchers suggest that effects of genes in complex disorders like
psychiatric illnesses are most likely to be uncovered when such life stresses are
measured, since a gene's effects may only be expressed, or turned on, in people
exposed to the requisite environmental risks.
Also participating in the study were: Karen Sugden, Alan Taylor, Dr. Ian Craig,
Joseph McClay, Jonathan Mill, King's College London; Dr. Honalee Harrington,
University of Wisconsin; Judy Martin, Dr. Richie Poulton, Dunedin School of
Medicine; Dr. Antony Braithwaite, University of Otago.
Among people who had inherited two copies of the stress-sensitive short version
of the serotonin transporter gene (s/s), 43 percent developed depression following
four stressful life events in their early twenties, compared to 17 percent among
people with two copies of the stress-protective long version (l/l). About 17
percent of the 847 subjects carried two copies of the short version, 31 percent
two copies of the long version, and 51 percent one copy of each version.
Previous: How the Gene was Found
Adapted from: Gene More Than Doubles Risk Of Depression Following Life Stresses
(http://www.nimh.nih.gov/press/prgenestress.cfm)
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