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CDK7 in C. elegans

CDK7 is a kinase that is thought to play dual roles in transcription and cell-cycle regulation by phosphorylating the carboxy-terminal domain of RNA polymerase II and also phosphorylating other cyclin-dependent kinases (CDKs). In the April 16 Proceedings of the National Academy of Sciences, Wallenfang and Seydoux at the Johns Hopkins University School of Medicine describe a study of the C. elegans cdk-7 gene (Proc Natl Acad Sci USA 2002, 99:315-320). They conducted a genome-wide screen for temperature-sensitive (ts) embryonic lethal mutants affecting transcription and came up with a ts allele of cdk-7. The cdk-7 ts mutants displayed defects in mRNA synthesis and RNA polymerase phosphorylation, as well as independently regulating cell-cycle progression. They also found that cdk-7 is essential in the worm for meiosis and for maintaining normal cell ploidy.

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    Cyclin-dependent kinase 7: at the cross-roads of transcription, DNA repair and cell cycle control?

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    Proceedings of the National Academy of Sciences, [http://www.pnas.org]

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    Johns Hopkins Medical Institutions , [http://www.jhmi.edu]

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Weitzman, J.B. CDK7 in C. elegans. Genome Biol 3, spotlight-20020418-01 (2002). https://doi.org/10.1186/gb-spotlight-20020418-01

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Keywords

  • Normal Cell
  • Dual Role
  • mRNA Synthesis
  • Lethal Mutant
  • Cell Ploidy