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lin-35/Rb cooperates with the SWI/SNF complex to control Caenorhabditis elegans larval development.

Cui M., Fay D.S., Han M.

Null mutations in lin-35, the Caenorhabditis elegans ortholog of the mammalian Rb protein, cause no obvious morphological defects. Using a genetic approach to identify genes that may function redundantly with lin-35, we have isolated a mutation in the C. elegans psa-1 gene. lin-35; psa-1 double mutants display severe developmental defects leading to early larval arrest and adult sterility. The psa-1 gene has previously been shown to encode a C. elegans homolog of yeast SWI3, a critical component of the SWI/SNF complex, and has been shown to regulate asymmetric cell divisions during C. elegans development. We observed strong genetic interactions between psa-1 and lin-35 as well as a subset of the class B synMuv genes that include lin-37 and lin-9. Loss-of-function mutations in lin-35, lin-37, and lin-9 strongly enhanced the defects of asymmetric T cell division associated with a psa-1 mutation. Our results suggest that LIN-35/Rb and a certain class B synMuv proteins collaborate with the SWI/SNF protein complex to regulate the T cell division as well as other events essential for larval growth.

Genetics 167:1177-1185(2004) [PubMed] [Europe PMC]

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