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Genealogy and biogeography meet personalized medicine
Date:4/29/2014

Biogeographical data is useful in screening for disease risk and drug sensitivity associated with certain ethnic groups. A team of researchers, including an investigator from Children's Hospital Los Angeles, has developed a tool to accurately identify the biogeography of worldwide individuals. Previous tools were accurate in identifying place of origin within homogeneous European populations but highly inaccurate for places with significant immigration, such as the U.S.

Tatiana Tatarinova, PhD, of The Saban Research Institute of Children's Hospital Los Angeles, Eran Elhaik, PhD, of the University of Sheffield and colleagues developed an admixture-based Geographic Population Structure (GPS) tool that uses genetic distribution and geographical distance to determine place of origin, specifically the country, or in some cases, the village of origin. Their study will be published in the journal Nature Communications on April 29, 2014.

"We were surprised by the simplicity and precision of this method," said Tatarinova, who is also an associate professor of Research Pediatrics at the Keck School of Medicine of the University of Southern California. "People in a given geographical area are more likely to have similar genetics. When they also have genetic traits typically found in other, distant regions, the geographical origin of those traits is generally the closest location where those traits can be found."

Using a database of worldwide populations, the investigators developed a dataset of reference populations that are genetically diverse and have been geographically localized for centuries. With the GPS tool, the investigators were able to take unknown samples, identify the proportions of admixture--meaning, genetic characteristics specific to certain ethnic groups that were combined because of events like migration or invasion--and then calculate the distance to the nearest known population that shares the same admixtu
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Contact: Ellin Kavanagh
ekavanagh@chla.usc.edu
323-361-8505
Children's Hospital Los Angeles
Source:Eurekalert  

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