Metaphase to anaphase (mat) transition-defective mutants in Caenorhabditis elegans.
The metaphase to anaphase transition is a critical stage of the eukaryotic cell cycle, and, thus, it is highly regulated. Errors during this transition can lead to chromosome segregation defects and death of the organism. In genetic screens for temperature-sensitive maternal effect embryonic lethal (Mel) mutants, we have identified 32 mutants in the nematode Caenorhabditis elegans in which fertilized embryos arrest as one-cell embryos. In these mutant embryos, the oocyte chromosomes arrest in metaphase of meiosis I without transitioning to anaphase or producing polar bodies. An additional block in M phase exit is evidenced by the failure to form pronuclei and the persistence of phosphohistone H3 and MPM-2 antibody staining. Spermatocyte meiosis is also perturbed; primary spermatocytes arrest in metaphase of meiosis I and fail to produce secondary spermatocytes. Analogous mitotic defects cause M phase delays in mitotic germline proliferation. We have named this class of mutants "mat" for metaphase to anaphase transition defective. These mutants, representing six different complementation groups, all map near genes that encode subunits of the anaphase promoting complex or cyclosome, and, here, we show that one of the genes, emb-27, encodes the C. elegans CDC16 ortholog.
Golden
A
A
Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892, USA.
Sadler
P L
PL
Wallenfang
M R
MR
Schumacher
J M
JM
Hamill
D R
DR
Bates
G
G
Bowerman
B
B
Seydoux
G
G
Shakes
D C
DC
D000483:Alleles; D000705:Anaphase / Q000235:genetics*; D064173:Anaphase-Promoting Complex-Cyclosome; D000818:Animals; D017173:Caenorhabditis elegans / Q000166:cytology* / Q000196:embryology / Q000235:genetics* / Q000378:metabolism; D018797:Cell Cycle Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D004625:Embryo, Nonmammalian / Q000166:cytology / Q000378:metabolism; D005260:Female; D017238:Genes, Helminth / Q000235:genetics; D005804:Genes, Lethal / Q000235:genetics; D005816:Genetic Complementation Test; D006657:Histones / Q000378:metabolism; D008025:Ligases / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D008297:Male; D008540:Meiosis / Q000235:genetics*; D008677:Metaphase / Q000235:genetics*; D009035:Mothers; D009154:Mutation / Q000235:genetics*; D010641:Phenotype; D010750:Phosphoproteins / Q000378:metabolism; D021122:Protein Subunits; D013090:Spermatocytes / Q000166:cytology / Q000378:metabolism; D014404:Tubulin / Q000378:metabolism; D043743:Ubiquitin-Protein Ligase Complexes; D044767:Ubiquitin-Protein Ligases
D018797:Cell Cycle Proteins; D006657:Histones; D010750:Phosphoproteins; D021122:Protein Subunits; D014404:Tubulin; D043743:Ubiquitin-Protein Ligase Complexes; D064173:Anaphase-Promoting Complex-Cyclosome; D044767:Ubiquitin-Protein Ligases; D008025:Ligases