title: cec-1, a soma-specific chromobox-containing gene in C. elegans.
abstract: The chromo domain is a phylogenetically conserved sequence motif which was identified as a region of homology between the repressor protein Pc and the heterochromatin constitutive protein HP1 of Drosophila. The specific function of the chromo domain is not yet understood, but it seems to be required for protein-protein interactions in chromatin-associated complexes. Here, we present a new chromobox-containing gene from Caenorhabditis elegans (cec-1). It encodes a nuclear protein that is present in all somatic cells from the 50- to 80-cell stage on throughout development and in adult animals. No cec-1 protein was detected in the cells of early embryos, in germ cells, and in their precursor cells Z2 and Z3. cec-1 mRNA, however, is already present in all the blastomeres of early embryos. Immunolocalization experiments revealed a homogeneous distribution of CEC-1 within interphase nuclei, while during mitosis CEC-1 seems to dissociate from the condensing chromosomes. The expression pattern of the cec-1 gene suggests that it may represent a new regulatory gene in C. elegans.
authors.affiliation: Institute of Zoology, University of Fribourg, Switzerland.
authors.forename: E
authors.initials: E
authors.lastname: Agostoni
authors.forename: D
authors.initials: D
authors.lastname: Albertson
authors.forename: C
authors.initials: C
authors.lastname: Wittmann
authors.forename: F
authors.initials: F
authors.lastname: Hill
authors.forename: H
authors.initials: H
authors.lastname: Tobler
authors.forename: F
authors.initials: F
authors.lastname: Müller
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D017173:Caenorhabditis elegans / Q000196:embryology / Q000235:genetics*; D029742:Caenorhabditis elegans Proteins; D002868:Chromosomal Proteins, Non-Histone / Q000235:genetics*; D003001:Cloning, Molecular; D017124:Conserved Sequence; D004330:Drosophila; D018507:Gene Expression Regulation, Developmental; D015801:Helminth Proteins / Q000235:genetics*; D008969:Molecular Sequence Data; D016415:Sequence Alignment
chemical_list: C102032:CEC-1 protein, C elegans; D029742:Caenorhabditis elegans Proteins; D002868:Chromosomal Proteins, Non-Histone; D015801:Helminth Proteins