A Loss-of-Function Splice Acceptor Variant in IGF2 Is Protective for Type 2 Diabetes

0301 basic medicine Genotype European Continental Ancestry Group LOCI 610 SUSCEPTIBILITY TRIGLYCERIDE LEVELS DISEASE White People GENETIC ARCHITECTURE Cell Line Endocrinology & Metabolism 03 medical and health sciences QUALITY-CONTROL Insulin-Like Growth Factor II Mexican Americans Diabetes Mellitus Humans Protein Isoforms RNA-SEQ GENOME-WIDE ASSOCIATION Mexico 11 Medical and Health Sciences Broad Genomics Platform 0303 health sciences Science & Technology Stem Cells Genetic Variation Genetics/Genomes/Proteomics/Metabolomics GROWTH-FACTOR-II T2D-GENES Consortium 3. Good health Diabetes Prevention Program Research Group SIGMA T2D Genetics Consortium Adipose Tissue Diabetes Mellitus, Type 2 Gene Expression Regulation Liver RNA Splice Sites Life Sciences & Biomedicine Type 2 MEXICAN-AMERICANS
DOI: 10.2337/db17-0187 Publication Date: 2017-08-25T00:20:21Z
ABSTRACT
Type 2 diabetes (T2D) affects more than 415 million people worldwide, and its costs to the health care system continue to rise. To identify common or rare genetic variation with potential therapeutic implications for T2D, we analyzed and replicated genome-wide protein coding variation in a total of 8,227 individuals with T2D and 12,966 individuals without T2D of Latino descent. We identified a novel genetic variant in the IGF2 gene associated with ∼20% reduced risk for T2D. This variant, which has an allele frequency of 17% in the Mexican population but is rare in Europe, prevents splicing between IGF2 exons 1 and 2. We show in vitro and in human liver and adipose tissue that the variant is associated with a specific, allele-dosage–dependent reduction in the expression of IGF2 isoform 2. In individuals who do not carry the protective allele, expression of IGF2 isoform 2 in adipose is positively correlated with both incidence of T2D and increased plasma glycated hemoglobin in individuals without T2D, providing support that the protective effects are mediated by reductions in IGF2 isoform 2. Broad phenotypic examination of carriers of the protective variant revealed no association with other disease states or impaired reproductive health. These findings suggest that reducing IGF2 isoform 2 expression in relevant tissues has potential as a new therapeutic strategy for T2D, even beyond the Latin American population, with no major adverse effects on health or reproduction.
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