PMID: 7537375Apr 25, 1995Paper

The Wsh and Ph mutations affect the c-kit expression profile: c-kit misexpression in embryogenesis impairs melanogenesis in Wsh and Ph mutant mice

Proceedings of the National Academy of Sciences of the United States of America
R DuttlingerP Besmer

Abstract

The receptor tyrosine kinases (RTKs) c-kit and platelet-derived growth factor receptor alpha chain (PDG-FRa) are encoded at the white spotting (W) and patch (Ph) loci on mouse chromosome 5. While W mutations affect melanogenesis, gametogenesis, and hematopoiesis, the Ph mutation affects melanogenesis and causes early lethality in homozygotes. W-sash (Wsh) is an expression mutation and blocks c-kit expression in certain cell types and enhances c-kit expression in others, including at sites important for early melanogenesis. We have determined the effect of Ph on c-kit expression during embryogenesis in Ph heterozygotes. Immunohistochemical analysis revealed enhanced c-kit expression in several cell types, including sites important for early melanogenesis. We propose that in both Wsh and Ph mutant mice c-kit misexpression affects early melanogenesis and is responsible for the pigment deficiency. Moreover, we have defined the organization of the RTKs in the W/Ph region on chromosome 5 and characterized the Wsh mutation by using pulsed-field gel electrophoresis. Whereas the order of the RTK genes was determined as Pdgfra-c-kit-flk1, analysis of the Wsh mutation revealed that the c-kit and Pdgfra genes are unlinked in Wsh, presumabl...Continue Reading

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