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New genes discovered for adult BMI levels
Date:10/25/2012

A large international study has identified three new gene variants associated with body mass index (BMI) levels in adults. The scientific consortium, numbering approximately 200 researchers, performed a meta-analysis of 46 studies, covering gene data from nearly 109,000 adults, spanning four ethnic groups.

In discovering intriguing links to lipid-related diseases, type 2 diabetes and other disorders, the IBC 50K SNP Array BMI Consortium's study may provide fundamental insights into the biology of adult obesity. Scientists from the Center for Applied Genomics at The Children's Hospital of Philadelphia led the study, using the CardioChip, a gene array containing probes for some 50,000 genetic variants across 2,100 genes relevant to cardiovascular and metabolic functions.

The study appeared online Sept. 21 in Human Molecular Genetics.

"BMI is a widely used measure of obesity, which affects one third of U.S. adults, and approximately half a billion people worldwide," said first author Yiran Guo, Ph.D., of Children's Hospital, who led the meta-analysis. "Previous studies have shown that genetics plays an important role in obesity, and this study expands our knowledge of BMI genetics."

The researchers first analyzed a dataset of approximately 51,000 individuals of European ancestry (EA) to discover initial gene signals, and then performed replication studies in another 27,000 EA subjects, as well as 14,500 additional EA individuals. Further analyses of data from approximately 12,300 African Americans, 2,600 Hispanics and 1,100 East Asians strengthened the team's findings.

The researchers uncovered three novel signals, from the genes TOMM40-APOE-APOC1, SREBF2 and NTRK2) that were significantly associated with BMI in adults. All had previously been linked to other important disorders. The APOE locus is well known to be involved in blood lipid regulation and circulation, and plays an important role in Alzheimer's disea
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Contact: Dana Mortensen
Mortensen@email.chop.edu
267-426-6092
Children's Hospital of Philadelphia
Source:Eurekalert

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