Genetic determinants of glycated hemoglobin levels in the Greenlandic Inuit population.

Eur J Hum Genet 2018 06 26;26(6):868-875. Epub 2018 Feb 26.

The Novo Nordisk Foundation Center for Basic Metabolic Research, Section for Metabolic Genetics, Faculty of Health and Medical Sciences, University of Copenhagen, 2200, Copenhagen, Denmark.

We previously showed that a common genetic variant leads to a remarkably increased risk of type 2 diabetes (T2D) in the small and historically isolated Greenlandic population. Motivated by this, we aimed at discovering novel genetic determinants for glycated hemoglobin (HbA) and at estimating the effect of known HbA-associated loci in the Greenlandic population. We analyzed genotype data from 4049 Greenlanders generated using the Illumina Cardio-Metabochip. We performed the discovery association analysis by an additive linear mixed model. To estimate the effect of known HbA-associated loci, we modeled the effect in the European and Inuit ancestry proportions of the Greenlandic genome (EAPGG and IAPGG, respectively). After correcting for multiple testing, we found no novel significant associations. When we investigated loci known to associate with HbA levels, we found that the lead variant in the GCK locus associated significantly with HbA levels in the IAPGG ([Formula: see text]). Furthermore, for 10 of 15 known HbA loci, the effects in IAPGG were similar to the previously reported effects. Interestingly, the ANK1 locus showed a statistically significant ancestral population differential effect, with opposing directions of effect in the two ancestral populations. In conclusion, we found only 1 of the 15 known HbA loci to be significantly associated with HbA levels in the IAPGG and that two-thirds of the loci showed similar effects in Inuit as previously found in European and East Asian populations. Our results shed light on the genetic effects across ethnicities.

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http://dx.doi.org/10.1038/s41431-018-0109-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5974304PMC
June 2018
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