Journal Article

NOTCH, a new signaling pathway implicated in holoprosencephaly

Valérie Dupé, Lucie Rochard, Sandra Mercier, Yann Le Pétillon, Isabelle Gicquel, Claude Bendavid, Georges Bourrouillou, Usha Kini, Christel Thauvin-Robinet, Timothy P. Bohan, Sylvie Odent, Christèle Dubourg and Véronique David

in Human Molecular Genetics

Volume 20, issue 6, pages 1122-1131
Published in print March 2011 | ISSN: 0964-6906
Published online December 2010 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/ddq556
NOTCH, a new signaling pathway implicated in holoprosencephaly

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Genetics of Holoprosencephaly (HPE), a congenital malformation of the developing human forebrain, is due to multiple genetic defects. Most genes that have been implicated in HPE belong to the sonic hedgehog signaling pathway. Here we describe a new candidate gene isolated from array comparative genomic hybridization redundant 6qter deletions, DELTA Like 1 (DLL1), which is a ligand of NOTCH. We show that DLL1 is co-expressed in the developing chick forebrain with Fgf8. By treating chick embryos with a pharmacological inhibitor, we demonstrate that DLL1 interacts with FGF signaling pathway. Moreover, a mutation analysis of DLL1 in HPE patients revealed a three-nucleotide deletion. These various findings implicate DLL1 in early patterning of the forebrain and identify NOTCH as a new signaling pathway involved in HPE.

Journal Article.  6099 words.  Illustrated.

Subjects: Genetics and Genomics

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