4.5 Article

Comprehensive fine mapping of chr12q12-14 and follow-up replication identify activin receptor 1B (ACVR1B) as a muscle strength gene

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EUROPEAN JOURNAL OF HUMAN GENETICS
卷 19, 期 2, 页码 208-215

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NATURE PUBLISHING GROUP
DOI: 10.1038/ejhg.2010.173

关键词

complex trait; combined linkage and association analyses; family-based association; genotype/phenotype association

资金

  1. KU Leuven [OT/04/44, OT/98/39]
  2. Research Foundation Flanders (FWO) [G.0496.05]
  3. FWO [G.0496.05]
  4. National Institute on Aging, National Institutes of Health [AG022791]
  5. Flemish Government

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Muscle strength is important in functional activities of daily living and the prevention of common pathologies. We describe the two-staged fine mapping of a previously identified linkage peak for knee strength on chr12q12-14. First, 209 tagSNPs in/around 74 prioritized genes were genotyped in 500 Caucasian brothers from the Leuven Genes for Muscular Strength study (LGfMS). Combined linkage and family-based association analyses identified activin receptor 1B (ACVR1B) and inhibin beta C (INHBC), part of the transforming growth factor beta pathway regulating myostatin - a negative regulator of muscle mass - signaling, for follow-up. Second, 33 SNPs, selected in these genes based on their likelihood to functionally affect gene expression/function, were genotyped in an extended sample of 536 LGfMS siblings. Strong associations between ACVR1B genotypes and knee muscle strength (P-values up to 0.00002) were present. Of particular interest was the association with rs2854464, located in a putative miR-24-binding site, as miR-24 was implicated in the inhibition of skeletal muscle differentiation. Rs2854464 AA individuals were similar to 2% stronger than G-allele carriers. The strength increasing effect of the A-allele was also observed in an independent replication sample (n=266) selected from the Baltimore Longitudinal Study of Aging and a Flemish Policy Research Centre Sport, Physical Activity and Health study. However, no genotype-related difference in ACVR1B mRNA expression in quadriceps muscle was observed. In conclusion, we applied a two-stage fine mapping approach, and are the first to identify and partially replicate genetic variants in the ACVR1B gene that account for genetic variation in human muscle strength. European Journal of Human Genetics (2011) 19, 208-215; doi:10.1038/ejhg.2010.173; published online 10 November 2010

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