Genome-wide association studies in Samoans give insight into the genetic architecture of fasting serum lipid levels.

Abstract:

:The current understanding of the genetic architecture of lipids has largely come from genome-wide association studies (GWAS). To date, few GWAS have examined the genetic architecture of lipids in Polynesians, and none have in Samoans, whose unique population history, including many population bottlenecks, may provide insight into the biological foundations of variation in lipid levels. Here we performed a GWAS of four fasting serum lipid levels: total cholesterol (TC), high-density lipoprotein (HDL), low-density lipoprotein (LDL), and triglycerides (TG) in a sample of 2849 Samoans, with validation genotyping for associations in a replication cohort comprising 1798 Samoans and American Samoans. We identified multiple genome-wide significant associations (P < 5 × 10-8) previously seen in other populations-APOA1 with TG, CETP with HDL, and APOE with TC and LDL-and several suggestive associations (P < 1 × 10-5), including an association of variants downstream of MGAT1 and RAB21 with HDL. However, we observed different association signals for variants near APOE than what has been previously reported in non-Polynesian populations. The association with several known lipid loci combined with the newly identified associations with variants near MGAT1 and RAB21 suggest that while some of the genetic architecture of lipids is shared between Samoans and other populations, part of the genetic architecture may be Polynesian-specific.

journal_name

J Hum Genet

authors

Carlson JC,Weeks DE,Hawley NL,Sun G,Cheng H,Naseri T,Reupena MS,Tuitele J,Deka R,McGarvey ST,Minster RL

doi

10.1038/s10038-020-0816-9

subject

Has Abstract

pub_date

2021-02-01 00:00:00

pages

111-121

issue

2

eissn

1434-5161

issn

1435-232X

pii

10.1038/s10038-020-0816-9

journal_volume

66

pub_type

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