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Oocyte-specific gene mutations cause premature ovarian failure
Date:5/22/2008

Mutations in a gene called FIGLA cause premature ovarian failure in at least a percentage of women who suffer from the disorder, said researchers from Baylor College of Medicine in Houston and Shandong University in China in a report that appears online today in the American Journal of Human Genetics.

We hope to use the information from this study and others that identify genes associated with this problem to find biomarkers in blood that can help us determine a womans risk of early infertility, said Dr. Aleksandar Rajkovic, associate professor of obstetrics and gynecology at BCM and senior author of the paper. Premature ovarian failure, which means that the ovaries lose function before age 40, not only causes infertility but also bone and heart problems, he said.

It affects 1 percent of women, he said. While most people associate it with infertility, women with premature ovarian failure face an increased risk of cardiovascular disease, osteoporosis and premature death. Ovarian reserves are important for womens health.

In looking for genes that cause the disorder, Rajkovic and his colleagues here and in China concentrated on those that are most likely to function in the ovary. A gene mutation does not totally halt gene activity, but Rajkovic believes it can accelerate the loss of eggs (or germ cells). When all the eggs are lost, the ovaries stop producing estrogen, leading to menopause symptoms.

In this study, Rajkovic and his collaborators screened 100 Chinese women with premature ovarian failure for mutations in FIGLA and found three different kinds of mutations in the FIGLA genes of four.

FIGLA is one of four transcription factors found to control the differentiation of egg cells early in development. Transcription factors govern the activity of genes, turning them off and on and modulating the extent to which they are active.

The other genes involved include NOBOX, GDF9 and BMP 15, said Rajkovic. Mut
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Contact: Glenna Picton
picton@bcm.edu
713-798-4710
Baylor College of Medicine
Source:Eurekalert

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