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Mannose-Binding Lectin Deficiency Is Associated with Myocardial Infarction: The HUNT2 Study in Norway

Vengen, Inga Thorsen; Madsen, Hans O; Garred, Peter; Platou, Carl Geoffrey Parrinder; Vatten, Lars Johan; Videm, Vibeke
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/2365823
Date
2012
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  • Institutt for klinisk og molekylær medisin [2008]
  • Institutt for samfunnsmedisin og sykepleie [1716]
  • Publikasjoner fra CRIStin - NTNU [19849]
Original version
PLoS ONE 2012, 7(7)   10.1371/journal.pone.0042113
Abstract
Objectives:

Mannose-binding lectin (MBL) and ficolins activate the complement cascade, which is involved in atherogenesis. Based on a pilot study, we hypothesized that functional polymorphisms in the MBL gene (MBL2) leading to dysfunctional protein are related to development of myocardial infarction (MI). The aim of the present study was to study polymorphisms in MBL2 and ficolin genes in relation to the risk of MI.

Methods and Results:

Using the population-based HUNT Study in Norway, 57133 persons were followed up for a first-time MI from 1995–1997 until the end of 2008. The 370 youngest MI patients were matched by age (range 29–62 years) and gender to 370 controls. A younger population was selected because disease in this group might be less dependent on non-genetic risk factors. The study size was based on power calculation. Polymorphisms in MBL2 and in the genes of ficolin-1, ficolin-2 and ficolin-3 were genotyped by pyrosequencing and related to the risk of MI, estimated as odds ratios (OR). Functional haplotypes were analyzed and stringent alpha levels of significance were set by permutation testing. Variant MBL2 haplotypes causing MBL deficiency were associated with a two-fold higher risk of MI (OR 2.04, 95%CI 1.29–3.24). Adjustments for conventional cardiovascular risk factors did not substantially influence the association. The ficolins were not associated with MI risk.

Conclusion:

In a young to middle aged and relatively healthy Caucasian population, MBL2 variants related to functional MBL deficiency were associated with a doubling of the risk for MI, independent of conventional risk factors. This supports that MBL deficiency may lead to increased atherosclerosis or development of vulnerable plaques.
Publisher
Public Library of Science
Journal
PLoS ONE

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