title: Cyclin D involvement demarcates a late transition in C. elegans embryogenesis.
abstract: During development, progression through the cell cycle must be coordinately regulated with cellular differentiation. Despite significant progress in identifying genes required independently for each of these processes, the molecules which facilitate this cross talk have for the most part been elusive. Using the six macrophage-like coelomocytes of the nematode Caenorhabditis elegans as a model system to gain insight into the mesodermal differentiation pathway, we have isolated a set of mutants that alter coelomocyte numbers. One of these mutations, cc600, apparently results from a partial loss-of-function in the C. elegans cyclin D gene, cyd-1. The mutant has coelomocyte-specific defects without changes in other lineages. The mutants show that cell growth, terminal differentiation and cellular function proceed in the absence of cyd-1 activity and cell division. The results suggest that certain mesodermal lineages may be uniquely affected by changes in cyd-1 activity.
authors.affiliation: Carnegie Institution of Washington, Department of Embryology, 115 West University Parkway, Baltimore, MD 21218, USA. jly@alum.mit.edu
authors.forename: Judith
authors.initials: J
authors.lastname: Yanowitz
authors.forename: Andrew
authors.initials: A
authors.lastname: Fire
mesh_terms: D000818:Animals; D001483:Base Sequence; D019521:Body Patterning; D017173:Caenorhabditis elegans / Q000196:embryology*; D029742:Caenorhabditis elegans Proteins / Q000502:physiology; D002453:Cell Cycle; D002454:Cell Differentiation; D003001:Cloning, Molecular; D056741:Cyclin D; D016213:Cyclins / Q000235:genetics / Q000502:physiology*; D017931:DNA Primers; D004625:Embryo, Nonmammalian / Q000502:physiology*; D008648:Mesoderm / Q000502:physiology; D009024:Morphogenesis
chemical_list: D029742:Caenorhabditis elegans Proteins; D056741:Cyclin D; D016213:Cyclins; D017931:DNA Primers