The mouse W/c-kit locus - PubMed (original) (raw)
Review
. 1990:148:158-66; discussion 166-72.
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- PMID: 1690623
Review
The mouse W/c-kit locus
A Bernstein et al. Ciba Found Symp. 1990.
Abstract
The mature cells in the haemopoietic system arise as the result of the extensive developmental and proliferative capacity of pluripotential stem cells. In order to understand the molecular basis for these developmental processes, it will be necessary to identify and characterize the cellular genes that control early steps in haemopoiesis. Mutations at the mouse W locus on chromosome 5 lead to pleiotropic developmental defects, including sterility, coat colour abnormalities, severe macrocytic anaemia and mast cell deficiency. The defects in all these lineages are cell autonomous and intrinsic, suggesting that the W locus encodes a gene product required directly for cellular differentiation. In an attempt to understand this classical mouse developmental mutation, we have demonstrated that the c-kit proto-oncogene, which encodes a transmembrane receptor tyrosine kinase, is very closely linked to W. Several further observations are consistent with the idea that W and c-kit are allelic: first, c-kit is expressed in those cell populations affected by W mutations; second, the expression of c-kit transcripts can be affected by mutations at the W locus; third, the tyrosine kinase activity associated with the protein encoded by c-kit is functionally impaired in mast cells derived from mutant W/Wv mice; and fourth, rearrangements within the c-kit gene have been reported in two W mutant alleles. These observations suggest that the dominant phenotype associated with W mutations results from loss-of-function alterations that affect the receptor tyrosine kinase encoded by c-kit. The demonstration that the W locus encodes a transmembrane growth factor receptor provides a molecular basis for understanding the intrinsic haemopoietic defect in W mutant mice and the role that this cellular proto-oncogene plays in haemopoiesis and other developmental processes.
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