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Genetic link to rapid weight gain from antipsychotics discovered
Date:7/17/2012

July 17, 2012 Toronto Scientists have discovered two genetic variants associated with the substantial, rapid weight gain occurring in nearly half the patients treated with antipsychotic medications, according to two studies involving the Centre for Addiction and Mental Health (CAMH).

These results could eventually be used to identify which patients have the variations, enabling clinicians to choose strategies to prevent this serious side-effect and offer more personalized treatment.

"Weight gain occurs in up to 40 per cent of patients taking medications called second-generation or atypical antipsychotics, which are used because they're effective in controlling the major symptoms of schizophrenia," says CAMH Scientist Dr. James Kennedy, senior author on the most recent study published online in the Archives of General Psychiatry.

This weight gain can lead to obesity, type 2 diabetes, heart problems and a shortened life span.

"Identifying genetic risks leading to these side-effects will help us prescribe more effectively," says Dr. Kennedy, head of the new Tanenbaum Centre for Pharmacogenetics, which is part of CAMH's Campbell Family Mental Health Research Institute. Currently, CAMH screens for two other genetic variations that affect patients' responses to psychiatric medications.

Each study identified a different variation near the melanocortin-4 receptor (MC4R) gene, which is known to be linked to obesity.

In the Archives of General Psychiatry study, people carrying two copies of a variant gained about three times as much weight as those with one or no copies, after six to 12 weeks of treatment with atypical antipsychotics. (The difference was approximately 6 kg versus 2 kg.) The study had four patient groups: two from the U.S., one in Germany and one from a larger European study.

"The weight gain was associated with this genetic variation in all these groups, which included pediatr
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Contact: Michael Torres
media@camh.ca
416-595-6015
Centre for Addiction and Mental Health
Source:Eurekalert

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