Scrutinizing the FTO locus: compelling evidence for a complex, long-range regulatory context

Human Genetics
M Rask-AndersenHelgi B Schioth

Abstract

Single nucleotide polymorphisms (SNPs) within a genetic region including the first two introns of the gene encoding FTO have consistently been shown to be the strongest genetic factors influencing body mass index (BMI). However, this same also contains several regulatory DNA elements that affect the expression of IRX3 and IRX5, which respectively, are located approximately 500 kb and 1.2 Mbp downstream from the BMI-associated FTO locus. Through these affected regulatory elements, genetic variation at the FTO locus influences adipocyte development leading to decreased thermogenesis and increased lipid storage. These findings provide a genomic model for the functional implications of genetic variations at this locus, and also demonstrate the importance of accounting for chromatin-chromatin interactions when constructing hypotheses for the mechanisms of trait and disease-associated common genetic variants. Several consortia have generated genome-wide datasets describing different aspects of chromatin biology which can be utilized to predict functionality and propose biologically relevant descriptions of specific DNA regions. Here, we review some of the publically available data resources on genome function and organization that ca...Continue Reading

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Mar 26, 2016·Pharmacology & Therapeutics·Yingmei Zhang, Jun Ren
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