Obesity gene NEGR1 associated with white matter integrity in healthy young adults

Dennis, E. L., Jahanshad, N., Braskie, M. N., Warstadt, N. M., Hibar, D. P., Kohannim, O., Nir, T. M., McMahon, K. L., de Zubicaray, G. I., Montgomery, G. W., Martin, N. G., Toga, A. W., Wright, M. J., & Thompson, P. M. (2014) Obesity gene NEGR1 associated with white matter integrity in healthy young adults. NeuroImage, 102(P2), pp. 548-557.

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Abstract

Obesity is a crucial public health issue in developed countries, with implications for cardiovascular and brain health as we age. A number of commonly-carried genetic variants are associated with obesity. Here we aim to see whether variants in obesity-associated genes - NEGR1, FTO, MTCH2, MC4R, LRRN6C, MAP2K5, FAIM2, SEC16B, ETV5, BDNF- AS, ATXN2L, ATP2A1, KCTD15, and TNN13K - are associated with white matter microstructural properties, assessed by high angular resolution diffusion imaging (HARDI) in young healthy adults between 20 and 30. years of age from the Queensland Twin Imaging study (QTIM). We began with a multi-locus approach testing how a number of common genetic risk factors for obesity at the single nucleotide polymorphism (SNP) level may jointly influence white matter integrity throughout the brain and found a wide spread genetic effect. Risk allele rs2815752 in NEGR1 was most associated with lower white matter integrity across a substantial portion of the brain. Across the area of significance in the bilateral posterior corona radiata, each additional copy of the risk allele was associated with a 2.2% lower average FA. This is the first study to find an association between an obesity risk gene and differences in white matter integrity. As our subjects were young and healthy, our results suggest that NEGR1 has effects on brain structure independent of its effect on obesity.

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ID Code: 85755
Item Type: Journal Article
Refereed: Yes
Keywords: Diffusion tensor imaging, Genetics, HARDI, Multi-locus, Obesity, SNP
DOI: 10.1016/j.neuroimage.2014.07.041
ISSN: 1095-9572
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2014 Elsevier.
Deposited On: 28 Sep 2015 03:07
Last Modified: 29 Sep 2015 04:54

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