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Detection of genetic loci associated with plasma fetuin-A: a meta-analysis of genome-wide association studies from the CHARGE Consortium. | LitMetric

AI Article Synopsis

  • Plasma fetuin-A is linked to type 2 diabetes, with the AHSG gene identified as a key genetic factor for diabetes and metabolic syndrome.
  • A genome-wide association study analyzed approximately 2.5 million SNPs among over 11,000 participants, finding the strongest SNP associations near the AHSG locus, with SNP rs4917 significantly lowering fetuin-A levels.
  • The results suggest AHSG is a promising candidate for further research to better understand its role in plasma fetuin-A levels and its potential as a target for diabetes treatment.

Article Abstract

Plasma fetuin-A is associated with type 2 diabetes, and AHSG, the gene encoding fetuin-A, has been identified as a susceptibility locus for diabetes and metabolic syndrome. Thus far, unbiased investigations of the genetic determinants of plasma fetuin-A concentrations have not been conducted. We searched for single nucleotide polymorphisms (SNPs) related to fetuin-A concentrations by a genome-wide association study in six population-based studies. We examined the association of fetuin-A levels with ∼ 2.5 million genotyped and imputed SNPs in 9,055 participants of European descent and 2,119 African Americans. In both ethnicities, the strongest associations were centered in a region with a high degree of LD near the AHSG locus. Among 136 genome-wide significant (P < 0.05 × 10-8) SNPs near the AHSG locus, the top SNP was rs4917 (P =1.27 × 10-303), a known coding SNP in exon 6 that is associated with a 0.06 g/l (∼13%) lower fetuin-A level. This variant alone explained 14% of the variation in fetuin-A levels. Analyses conditioned on rs4917 indicated that the strong association with the AHSG locus stems from additional independent associations of multiple variants among European Americans. In conclusion, levels of fetuin-A in plasma are strongly associated with SNPs in its encoding gene, AHSG, but not elsewhere in the genome. Given the strength of the associations observed for multiple independent SNPs, the AHSG gene is an example of a candidate locus suitable for additional investigations including fine mapping to elucidate the biological basis of the findings and further functional experiments to clarify AHSG as a potential therapeutic target.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6075215PMC
http://dx.doi.org/10.1093/hmg/ddx091DOI Listing

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