CGC Bibliography Paper 5504

Dominant mutations in the Caenorhabditis elegans Myt1 ortholog wee-1.3 reveal a novel domain that controls M-phase entry during spermatogenesis.

Lamitina ST, L'Hernault SW

Medline:

12397109

Citation:

Development 129: 5009-5018 2002

Type:

ARTICLE

Genes:

let-241 smg-6 spe-37 wee-1.3 eDf21 mnDf12 mnDf28 mnDf29 mnDf30 mnDf57 mnDf58 mnDf60 mnDf63 mnDf71 mnDf88

Abstract:

Regulatory phosphorylation of the Cdc2p kinase by Wee1p-type kinases prevents eukaryotic cells from entering mitosis or meiosis at an inappropriate time. The canonical Wee1p kinase is a soluble protein that functions in the eukaryotic nucleus. All metazoa also have a membrane-associated Wee1p-like kinase named Myt1, and we describe the first genetic characterization of this less well-studied kinase. The Caenorhabditis elegans Myt1 ortholog is encoded by the wee-1.3 gene, and six dominant missense mutants prevent primary spermatocytes from entering M phase but do not affect either oocyte meiosis or any mitotic division. These six dominant wee-1.3(gf) mutations are located in a four amino acid region near the C terminus and they cause self-sterility of hermaphrodites. Second-site intragenic suppressor mutations in wee-1.3(gf) restore self-fertility to these dominant sterile hermaphrodites, permitting genetic dissection of this kinase. Ten intragenic wee-1.3 suppressor mutations were recovered and they form an allelic series that includes semi-dominant, hypomorphic and null mutations. These mutants reveal that WEE-1.3 protein is required for embryonic development, germline proliferation and initiation of meiosis during spermatogenesis. This suggests that a novel, sperm-specific pathway negatively regulates WEE-1.3 to allow the G2/M transition of male meiosis I, and