Steel-Dickie mutation encodes a c-Kit ligand lacking transmembrane and cytoplasmic domains

Camilynn I. Brannan, Stewart D. Lyman, Douglas E. Williams, June Eisenman, Dirk M. Anderson, David Cosman, Mary A. Bedell, Nancy A. Jenkins, Neal G. Copeland

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284 Scopus citations


Mice homozygous for the viable Sl allele steel-Dickie (Sld) are sterile, severely anemic, and black-eyed white. The nature of the Sld mutation was investigated at the molecular level and was found to be due to a 4.0-kilobase intragenic deletion in mast cell growth factor (MGF) genomic sequences, providing conclusive evidence that Sl encodes MGF. As a consequence of this deletion, Sld is only capable of encoding a soluble truncated growth factor that lacks both transmembrane and cytoplasmic domains. Northern analysis indicates that Sld mRNA is expressed at approximately wild-type levels in adult tissues, and yeast expression studies suggest that the Sld protein is as biologically active as wild-type soluble MGF. These studies provide a molecular basis for explaining the Sld phenotype, a description of a germ-line mutation in the transmembrane and cytoplasmic domains of a membrane-bound growth factor, and in vivo evidence for the importance of membrane-bound forms of growth factors in mammalian development.

Original languageEnglish (US)
Pages (from-to)4671-4674
Number of pages4
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number11
StatePublished - Jun 1 1991

ASJC Scopus subject areas

  • General


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