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Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells
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Published on: March 9, 2012

lin-35 and lin-53, two genes that antagonize a C. elegans Ras pathway, encode proteins similar to Rb and its binding

X Lu1, H R Horvitz

  • 1Howard Hughes Medical Institute, Department of Biology, Massachusetts Institute of Technology, Cambridge 02139, USA.

Cell
|January 6, 1999
PubMed

Insights

Synthetic multivulva (synMuv) genes antagonize Ras signaling in C. elegans vulval induction. LIN-35 (Rb-like) and LIN-53 (RbAp48-like) repress transcription, preventing vulval cell fate gene expression.

Area of Science:

  • Developmental biology
  • Molecular genetics
  • Cell signaling

Background:

  • The Ras signaling pathway is crucial for vulval induction in *Caenorhabditis elegans*.
  • Synthetic multivulva (synMuv) genes antagonize this pathway through two redundant genetic pathways.

Purpose of the Study:

  • To characterize two genes, lin-35 and lin-53, involved in one of the synMuv pathways.
  • To elucidate the molecular mechanism by which these genes antagonize Ras signaling.

Main Methods:

  • Genetic characterization of lin-35 and lin-53 in *C. elegans*.
  • Comparative analysis of LIN-35 and LIN-53 protein sequences with mammalian homologs (Rb, p107, p130, RbAp48).

Main Results:

  • LIN-35 protein is similar to the tumor suppressor Rb and related proteins.
  • LIN-53 protein is similar to RbAp48, a mammalian Rb-binding protein.
  • LIN-35 and LIN-53 likely function as transcriptional corepressors, analogous to mammalian Rb/E2F interactions.

Conclusions:

  • LIN-35 and LIN-53 antagonize Ras signaling in *C. elegans* vulval development.
  • They function by repressing the transcription of genes essential for vulval cell fate specification.
  • This study reveals a conserved mechanism of transcriptional repression in development.

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