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Protein-Coding Variants Implicate Novel Genes Related to Lipid Homeostasis Contributing to Body Fat Distribution

Accepted version
Peer-reviewed

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Article

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Authors

Justice, Anne 
Thompson, Deborah 

Abstract

Body fat distribution is a heritable risk factor for a range of adverse health consequences, including hyperlipidemia and type 2 diabetes. To identify protein-coding variants associated with body fat distribution, assessed by waist-to-hip ratio adjusted for body mass index, we analyzed 246,328 431 predicted coding and splice site variants available on exome arrays in up to 344,369 individuals from five major ancestries for discovery and 132,177 independent European-ancestry individuals for validation. We identified 15 common (minor allele frequency, MAF ≥ 5%) and 9 low frequency or rare (MAF < 5%) coding variants that have not been reported previously. Pathway/gene set enrichment analyses of all associated variants highlight lipid particle, adiponectin level, abnormal white adipose tissue physiology, and bone development and morphology as processes affecting fat distribution and body shape. Furthermore, the cross-trait associations and the analyses of variant and gene function highlight a strong connection to lipids, cardiovascular traits, and type 2 diabetes. In functional follow-up analyses, specifically in Drosophila RNAi-knockdown crosses, we observed a significant increase in the total body triglyceride levels for two genes (DNAH10 and PLXND1). By examining variants often poorly tagged or entirely missed by genome-wide association studies, we implicate novel genes in fat distribution, stressing the importance of interrogating low-frequency and protein-coding variants.

Description

Keywords

31 Biological Sciences, 3105 Genetics, Obesity, Clinical Research, Nutrition, Genetics, Biotechnology, Prevention, Human Genome, 2.1 Biological and endogenous factors, 2 Aetiology, Cardiovascular, Metabolic and endocrine, Animals, Body Fat Distribution, Body Mass Index, Case-Control Studies, Drosophila, Exome, Female, Gene Frequency, Genetic Predisposition to Disease, Genetic Variation, Genome-Wide Association Study, Homeostasis, Humans, Lipids, Male, Proteins, Risk Factors, Waist-Hip Ratio

Journal Title

Nature Genetics

Conference Name

Journal ISSN

1061-4036

Volume Title

Publisher

Springer Nature
Sponsorship
British Heart Foundation (None)
British Heart Foundation (None)
Cambridge University Hospitals NHS Foundation Trust (CUH) (unknown)
MRC (MC_PC_13046)
Department of Health (via National Institute for Health Research (NIHR)) (NF-SI-0617-10149)
Department of Health (via National Institute for Health Research (NIHR)) (NF-SI-0512-10135)
Medical Research Council (MC_UU_12015/1)
MRC (MC_PC_13048)
European Commission (602068)
Medical Research Council (MR/S003746/1)
Medical Research Council (MC_PC_14089)
British Heart Foundation (RG/18/13/33946)
Cancer Research Uk (None)
Cancer Research UK (16565)
Medical Research Council (MC_UU_12015/2)