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Hum Mol Genet. 2017 Jun 15;26(12):2364-2376. doi: 10.1093/hmg/ddx123.

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

Author information

1
deCODE Genetics/Amgen, Inc., Reykjavik, Iceland.
2
Faculty of Medicine.
3
School of Engineering and Natural Sciences, University of Iceland, Reykjavik, Iceland.
4
Radboud University Medical Center, Radboud Institute for Molecular Life Sciences, Department of Laboratory Medicine, Nijmegen, The Netherlands.
5
Radboud University Medical Center, Radboud Institute for Health Sciences, Nijmegen, The Netherlands.
6
The Laboratory in Mjodd, Reykjavik, Iceland.
7
Department of Clinical Biochemistry, Akureyri Hospital, Akureyri, Iceland.
8
Department of Clinical Biochemistry.
9
Division of Cardiology, Department of Internal Medicine, Landspitali, National University Hospital of Iceland, Reykjavik, Iceland.

Abstract

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.

PMID:
28398513
DOI:
10.1093/hmg/ddx123
[Indexed for MEDLINE]

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