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Genes May Boost Woman's Risk of Postpartum Depression
Date:5/21/2013

By Amy Norton
HealthDay Reporter

TUESDAY, May 21 (HealthDay News) -- Pregnant women with specific alterations in two genes may be at increased risk of suffering depression after giving birth, a small new study suggests.

The researchers hope they can use the findings to develop a blood test that could help spot pregnant women who are vulnerable to postpartum depression, which affects around 15 percent of new mothers.

Their study, reported in the May 21 issue of the journal Molecular Psychiatry, uncovered specific chemical changes in two genes that predicted which women would develop postpartum depression with 85 percent accuracy.

Little is known about the genes, called TTC9B and HP1BP3, but they are somehow involved in activity in the brain's hippocampus, which regulates mood. Based on animal research, both genes seem to be "reactive to estrogen," said Zachary Kaminsky, a researcher at Johns Hopkins University School of Medicine in Baltimore who worked on the study.

The findings offer clues as to what makes some women susceptible to postpartum depression. But there is still a lot of work to be done before a screening test becomes available, according to an expert not involved in the research.

"This is a first step, but I think we're pretty far off from having a blood test," said Dr. Kimberly Yonkers, a professor of psychiatry and obstetrics and gynecology at Yale School of Medicine in New Haven, Conn.

She said the study was small -- involving only 51 women, about a dozen of whom developed depression within a month of giving birth -- so the results need to be validated in larger studies.

But beyond that, Yonkers said, there's the larger, "dicey" issue of how much benefit there would be from telling pregnant women their genes put them at heightened risk of postpartum depression.

"You may unnecessarily worry some women," Yonkers said.

"Information is power," Kaminsky said,
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