Conditional deletion of the colony stimulating factor-1 receptor (c-fms proto-oncogene) in mice

Genesis. 2006 Jul;44(7):328-35. doi: 10.1002/dvg.20219.


Colony stimulating factor-1 (CSF-1) is the primary regulator of the mononuclear phagocytic lineage acting through its transmembrane tyrosine kinase receptor, CSF-1R, that is the product of the c-fms proto-oncogene. Null mutations in either the ligand or the receptor genes result in a severe osteopetrosis as well as a number of other phenotypes, including reproductive defects and perturbations in organ development. The CSF-1R is also expressed in oocytes, myoblast progenitors, decidual, and trophoblastic cells. To distinguish cell type specific phenotypes, we have created a conditional allele of the Csf1r by placing LoxP sites around Exon 5 of the Csf1r gene in mice. Excision of this floxed sequence results in a null allele that in the homozygous state gives a phenotype indistinguishable of the complete Csf1r null mutant mouse. This conditional allele will prove extremely valuable to study the spatial and temporal roles of CSF-1R.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Female
  • Gene Targeting
  • Genes, fms / genetics*
  • Macrophage Colony-Stimulating Factor / metabolism
  • Male
  • Mice
  • Mice, Knockout
  • Mice, Transgenic
  • Phenotype
  • Receptors, Colony-Stimulating Factor / genetics*
  • Sequence Deletion*


  • Receptors, Colony-Stimulating Factor
  • Macrophage Colony-Stimulating Factor