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Dominant-negative ALK2 allele associates with congenital heart defects.

Smith, K. and Joziasse, I.C. and Chocron, S. and Dinther van, M. and Guryev, V. and Verhoeven, M.C. and Rehmann, H. and Smagt van der, J.J. and Doevendans, P.A. and Cuppen, E.P.J.G. and Mulder, B.J.M. and Dijke ten, P. and Bakkers, J.P.W.M. (2009) Dominant-negative ALK2 allele associates with congenital heart defects. Circulation, 119, 3062-9. ISSN 1524-4539.

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BACKGROUND: Serious congenital heart defects occur as a result of improper atrioventricular septum (AVS) development during embryogenesis. Despite extensive knowledge of the genetic control of AVS development, few genetic lesions have been identified that are responsible for AVS-associated congenital heart defects. METHODS AND RESULTS: We sequenced 32 genes known to be important in AVS development in patients with AVS defects and identified 11 novel coding single-nucleotide polymorphisms that are predicted to impair protein function. We focused on variants identified in the bone morphogenetic protein receptor, ALK2, and subjected 2 identified variants to functional analysis. The coding single-nucleotide polymorphisms R307L and L343P are heterozygous missense substitutions and were each identified in single individuals. The L343P allele had impaired functional activity as measured by in vitro kinase and bone morphogenetic protein-specific transcriptional response assays and dominant-interfering activity in vivo. In vivo analysis of zebrafish embryos injected with ALK2 L343P RNA revealed improper atrioventricular canal formation. CONCLUSIONS: These data identify the dominant-negative allele ALK2 L343P in a patient with AVS defects.

Item Type:Article
Institutes:Hubrecht Instituut
ID Code:6923
Deposited On:14 Dec 2009 01:00
Last Modified:13 Oct 2010 12:51

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