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A rare missense mutation in CHRNA4 associates with smoking behavior and its consequences
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2016 (English)In: Molecular Psychiatry, ISSN 1359-4184, E-ISSN 1476-5578, Vol. 21, no 5, 594-600 p.Article in journal (Refereed) PublishedText
Abstract [en]

Using Icelandic whole-genome sequence data and an imputation approach we searched for rare sequence variants in CHRNA4 and tested them for association with nicotine dependence. We show that carriers of a rare missense variant (allele frequency = 0.24%) within CHRNA4, encoding an R336C substitution, have greater risk of nicotine addiction than non-carriers as assessed by the Fagerstrom Test for Nicotine Dependence (P = 1.2 x 10(-4)). The variant also confers risk of several serious smoking-related diseases previously shown to be associated with the D398N substitution in CHRNA5. We observed odds ratios (ORs) of 1.7-2.3 for lung cancer (LC; P = 4.0 x 10(-4)), chronic obstructive pulmonary disease (COPD; P = 9.3 x 10(-4)), peripheral artery disease (PAD; P = 0.090) and abdominal aortic aneurysms (AAAs; P = 0.12), and the variant associates strongly with the early-onset forms of LC (OR = 4.49, P = 2.2 x 10(-4)), COPD (OR = 3.22, P = 2.9 x 10(-4)), PAD (OR = 3.47, P = 9.2 x 10(-3)) and AAA (OR = 6.44, P = 6.3 x 10(-3)). Joint analysis of the four smoking-related diseases reveals significant association (P = 6.8 x 10(-5)), particularly for early-onset cases (P = 2.1 x 10(-7)). Our results are in agreement with functional studies showing that the human alpha 4 beta 2 isoform of the channel containing R336C has less sensitivity for its agonists than the wild-type form following nicotine incubation.

Place, publisher, year, edition, pages
2016. Vol. 21, no 5, 594-600 p.
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Medical Genetics
URN: urn:nbn:se:umu:diva-120800DOI: 10.1038/mp.2016.13ISI: 000374324000004PubMedID: 26952864OAI: diva2:930973
Available from: 2016-05-26 Created: 2016-05-23 Last updated: 2016-06-07Bibliographically approved

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