Journal Article

<i>NOTCH1</i> mutations in individuals with left ventricular outflow tract malformations reduce ligand-induced signaling

Kim L. McBride, Maurisa F. Riley, Gloria A. Zender, Sara M. Fitzgerald-Butt, Jeffrey A. Towbin, John W. Belmont and Susan E. Cole

in Human Molecular Genetics

Volume 17, issue 18, pages 2886-2893
Published in print September 2008 | ISSN: 0964-6906
Published online June 2008 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddn187
NOTCH1 mutations in individuals with left ventricular outflow tract malformations reduce ligand-induced signaling

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Congenital aortic valve stenosis (AVS), coarctation of the aorta (COA) and hypoplastic left heart syndrome (HLHS) are congenital cardiovascular malformations that all involve the left ventricular outflow tract (LVOT). They are presumably caused by a similar developmental mechanism involving the developing endothelium. The exact etiology for most LVOT malformations is unknown, but a strong genetic component has been established. We demonstrate here that mutations in the gene NOTCH1, coding for a receptor in a developmentally important signaling pathway, are found across the spectrum of LVOT defects. We identify two specific mutations that reduce ligand (JAGGED1) induced NOTCH1 signaling. One of these mutations perturbs the S1 cleavage of the receptor in the Golgi. These findings suggest that the levels of NOTCH1 signaling are tightly regulated during cardiovascular development, and that relatively minor alterations may promote LVOT defects. These results also establish for the first time that AVS, COA and HLHS can share a common pathogenetic mechanism at the molecular level, explaining observations of these defects co-occurring within families.

Journal Article.  5011 words.  Illustrated.

Subjects: Genetics and Genomics

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