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Originally published as Genetics Published Articles Ahead of Print on October 22, 2006.

Genetics, Vol. 175, 107-123, January 2007, Copyright © 2007
doi:10.1534/genetics.106.059105

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Components of the Spindle Assembly Checkpoint Regulate the Anaphase-Promoting Complex During Meiosis in Caenorhabditis elegans

Kathryn K. Stein1, Edward S. Davis1,2, Thomas Hays and Andy Golden3

Laboratory of Biochemistry and Genetics, NIDDK, National Institutes of Health, Bethesda, Maryland 20892

3 Corresponding author: Laboratory of Biochemistry and Genetics, NIDDK/NIH, 8 Center Dr., MSC 0840, Bldg. 8, Room 323, Bethesda, MD 20892-0840.
E-mail: andyg{at}mail.nih.gov

Temperature-sensitive mutations in subunits of the Caenorhabditis elegans anaphase-promoting complex (APC) arrest at metaphase of meiosis I at the restrictive temperature. Embryos depleted of the APC co-activator FZY-1 by RNAi also arrest at this stage. To identify regulators and potential substrates of the APC, we performed a genetic suppressor screen with a weak allele of the APC subunit MAT-3/CDC23/APC8, whose defects are specific to meiosis. Twenty-seven suppressors that resulted in embryonic viability and larval development at the restrictive temperature were isolated. We have identified the molecular lesions in 18 of these suppressors, which correspond to five genes. In addition to a single intragenic suppressor, we found mutations in the APC co-activator fzy-1 and in three spindle assembly checkpoint genes, mdf-1, mdf-2, and mdf-3/san-1, orthologs of Mad1, Mad2, and Mad3, respectively. Reduction-of-function alleles of mdf-2 and mdf-3 suppress APC mutants and exhibit pleiotropic phenotypes in an otherwise wild-type background. Analysis of a single separation-of-function allele of mdf-1 suggests that MDF-1 has a dual role during development. These studies provide evidence that components of the spindle assembly checkpoint may regulate the metaphase-to-anaphase transition in the absence of spindle damage during C. elegans meiosis.


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Genetics 2007 175: NP. [Full Text]  



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