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Scrutinizing the FTO locus: compelling evidence for a complex, long-range regulatory context
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Functional Pharmacology. Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Immunology, Genetics and Pathology, Medicinsk genetik och genomik.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Biochemistry and Microbiology.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Functional Pharmacology.
2015 (English)In: Human Genetics, ISSN 0340-6717, E-ISSN 1432-1203, Vol. 134, no 11-12, 1183-1193 p.Article in journal (Refereed) Published
Abstract [en]

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 can be used to gain an overview of genetic regions of interest and to generate testable hypotheses for future studies. We use the BMI- and obesity-associated FTO locus as a subject as it poses an illustrative example on the value of these resources. We find that public databases strongly support long-range interactions between regulatory elements in the FTO locus with the IRXB cluster genes IRX3 and IRX5. Chromatin configuration capture data also support interactions across a large region stretching across from the RPGRIP1L gene, FTO and the IRXB gene cluster.

Place, publisher, year, edition, pages
2015. Vol. 134, no 11-12, 1183-1193 p.
National Category
Medical Genetics
Identifiers
URN: urn:nbn:se:uu:diva-268414DOI: 10.1007/s00439-015-1599-5ISI: 000363973000003PubMedID: 26340902OAI: oai:DiVA.org:uu-268414DiVA: diva2:877270
Funder
The Swedish Brain FoundationSwedish Research Council
Available from: 2015-12-06 Created: 2015-12-04 Last updated: 2017-12-01Bibliographically approved

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Rask-Andersen, MathiasAlmén, Markus SallmanSchiöth, Helgi B.

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Functional PharmacologyMedicinsk genetik och genomikDepartment of Medical Biochemistry and Microbiology
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