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- W2115087429 abstract "<h3>Background</h3> Bundle branch block (BBB) has been regarded as a disease of the conduction system, but occurs in mice lacking connexin 40 (expressed in atria, proximal conduction system) or connexin 43 (expressed in Purkinje cells, cardiomyocytes). <h3>Objective</h3> The aim of this paper is to explore whether BBB is heritable, and whether polymorphisms at connexin 40 and connexin 43 loci are associated with BBB. <h3>Methods</h3> To assess BBB heritability, we screened descendants of men with BBB in the population cohort ‘The Study of Men Born 1913’. DNA samples from 80-year-old men with extreme QRS-duration phenotypes were used to search for polymorphisms at connexin 40 and 43 loci. Associations between identified polymorphisms and BBB were evaluated in an independent cohort (INTERGENE). <h3>Results</h3> Seventy-seven men from ‘The Study of Men Born 1913’ with BBB had 116 descendants. Among the 76 participating descendants, 2 sons (6.4%) had BBB at 54 years of age. At the same age, 0.9% of men born in 1913 had BBB. We identified 6 single nucleotide polymorphisms (SNPs) in connexin 40 and 1 polymorphism in connexin 43. In the INTERGENE cohort, the connexin 43 polymorphism was associated with left BBB (LBBB) (4 of 35 LBBB vs 16 of 232 without BBB, χ<sup>2</sup>=7.4, p=0.03), but not with right BBB (RBBB) or overall BBB. None of the connexin 40 SNPs or haplotypes were associated with LBBB or RBBB. <h3>Conclusions</h3> These findings indicate that conduction by connexin 43 within the ventricular muscle distal to the specialised conduction system may be important for LBBB development." @default.
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- W2115087429 date "2015-04-01" @default.
- W2115087429 modified "2023-09-25" @default.
- W2115087429 title "Genetic variation at the human connexin 43 locus but not at the connexin 40 locus is associated with left bundle branch block" @default.
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- W2115087429 doi "https://doi.org/10.1136/openhrt-2014-000187" @default.
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