Mice mutant for Egfr and Shp2 have defective cardiac semilunar valvulogenesis.

Published

Journal Article

Atrioventricular and semilunar valve abnormalities are common birth defects, but how cardiac valvulogenesis is directed remains largely unknown. During studies of genetic interaction between Egfr, encoding the epidermal growth factor receptor, and Ptpn11, encoding the protein-tyrosine-phosphatase Shp2, we discovered that Egfr is required for semilunar, but not atrioventricular, valve development. Although unnoticed in earlier studies, mice homozygous for the hypomorphic Egfr allele waved-2 (Egfrwa2/wa2) exhibit semilunar valve enlargement resulting from over-abundant mesenchymal cells. Egfr-/- mice (CD1 background) have similar defects. The penetrance and severity of the defects in Egfrwa2/wa2 mice are enhanced by heterozygosity for a targeted mutation of exon 2 of Ptpn11 (ref. 3). Compound (Egfrwa2/wa2:Ptpn11+/-) mutant mice also show premature lethality. Electrocardiography, echocardiography and haemodynamic analyses showed that affected mice develop aortic stenosis and regurgitation. Our results identify the Egfr and Shp2 as components of a growth-factor signalling pathway required specifically for semilunar valvulogenesis, support the hypothesis that Shp2 is required for Egfr signalling in vivo, and provide an animal model for aortic valve disease.

Full Text

Duke Authors

Cited Authors

  • Chen, B; Bronson, RT; Klaman, LD; Hampton, TG; Wang, JF; Green, PJ; Magnuson, T; Douglas, PS; Morgan, JP; Neel, BG

Published Date

  • March 2000

Published In

Volume / Issue

  • 24 / 3

Start / End Page

  • 296 - 299

PubMed ID

  • 10700187

Pubmed Central ID

  • 10700187

International Standard Serial Number (ISSN)

  • 1061-4036

Digital Object Identifier (DOI)

  • 10.1038/73528

Language

  • eng

Conference Location

  • United States