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A new light shed on genetic regulation's role in the predisposition to common diseases
Date:9/2/2012

Genetic disease risk differences between one individual and another are based on complex aetiology. Indeed, they may reflect differences in the genes themselves, or else differences at the heart of the regions involved in the regulation of these same genes.

By gene regulation we mean the decision that the cell makes as to when, where and at what level to activate or suppress the expression of a gene. In theory, two people could thus share a gene that is perfectly identical and yet show differences in their predisposition to a disease due to genetic differences concerning the regulation (overexpression or underexpression) of this same gene.

Numerous teams are currently trying to draw up a map of regions involved in gene regulation. Not an easy task, but invaluable since it allows us to understand all the genetic causes that can explain the predisposition to certain diseases.

Working with twins

Emmanouil Dermitzakis, Louis-Jeantet Professor at the Faculty of Medicine and member of the NCCR Frontiers in Genetics and the Institute of Genetics and Genomics of Geneva (IGE3), is a specialist in what is called the genetics of complex traits. With an international team co-led by Professor Tim Spector (Kings College), Professor Mark McCarthy (Oxford University) and Dr. Panos Deloukas (Wellcome Trust Sanger Institute), he publishes a study highlighting thousands of these genetic variants that seem to explain individual differences in gene expression.

For this work, the researchers used samples of three different tissue types (adipose tissue, skin and blood cells) collected from more than 800 homozygotic (identical) and dizygotic twins.

"Identifying variants which control the activity of many genes is a greater challenge than we anticipated but we are developing appropriate tools to uncover them and understand their contribution to disease," comments Panos Deloukas. "Modern human genetics combined with samples donated by the participants in s
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Contact: Emmanouil Dermitzakis
emmanouil.dermitzakis@unige.ch
41-223-795-483
Universit de Genve
Source:Eurekalert

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