A rare splice donor mutation in the haptoglobin gene associates with blood lipid levels and coronary artery disease

Common sequence variants at the haptoglobin gene (HP) have been associated with blood lipid levels. Through whole-genome sequencing of 8,453 Icelanders, we discovered a splice donor founder mutation in HP (NM_001126102.1:c.190 + 1G > C, minor allele frequency = 0.56%). This mutation occurs on the...

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Bibliographic Details
Published in:Human molecular genetics 2017-06, Vol.26 (12), p.2364-2376
Main Authors: Bjornsson, Eythor, Helgason, Hannes, Halldorsson, Gisli, Helgadottir, Anna, Gylfason, Arnaldur, Kehr, Birte, Jonasdottir, Adalbjorg, Jonasdottir, Aslaug, Sigurdsson, Asgeir, Oddsson, Asmundur, Thorleifsson, Gudmar, Magnusson, Olafur Th, Gretarsdottir, Solveig, Zink, Florian, Kristjansson, Ragnar P, Asgeirsdottir, Margret, Swinkels, Dorine W, Kiemeney, Lambertus A, Eyjolfsson, Gudmundur I, Sigurdardottir, Olof, Masson, Gisli, Olafsson, Isleifur, Thorgeirsson, Gudmundur, Holm, Hilma, Thorsteinsdottir, Unnur, Gudbjartsson, Daniel F, Sulem, Patrick, Stefansson, Kari
Format: Article
Language:English
Subjects:
Adult
Alleles
Base Sequence
Coronary Artery Disease - genetics
Coronary Artery Disease - metabolism
DNA Copy Number Variations - genetics
Female
Gene Frequency - genetics
Genetic Association Studies - methods
Genetic Variation
Haptoglobins - genetics
Haptoglobins - metabolism
Humans
Iceland
Lipids - blood
Lipids - genetics
Lipoproteins - genetics
Male
Mutation
Odds Ratio
Risk Factors
RNA Splice Sites - genetics
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Summary:Common sequence variants at the haptoglobin gene (HP) have been associated with blood lipid levels. Through whole-genome sequencing of 8,453 Icelanders, we discovered a splice donor founder mutation in HP (NM_001126102.1:c.190 + 1G > C, minor allele frequency = 0.56%). This mutation occurs on the HP1 allele of the common copy number variant in HP and leads to a loss of function of HP1. It associates with lower levels of haptoglobin (P = 2.1 × 10-54), higher levels of non-high density lipoprotein cholesterol (β = 0.26 mmol/l, P = 2.6 × 10-9) and greater risk of coronary artery disease (odds ratio = 1.30, 95% confidence interval: 1.10-1.54, P = 0.0024). Through haplotype analysis and with RNA sequencing, we provide evidence of a causal relationship between one of the two haptoglobin isoforms, namely Hp1, and lower levels of non-HDL cholesterol. Furthermore, we show that the HP1 allele associates with various other quantitative biological traits.
ISSN:0964-6906
1460-2083
DOI:10.1093/hmg/ddx123