The Tex penetrance produced in wild-type animals by RNAi clones
against cell cycle genes that might be involved in cell extrusion (based on
the corresponding Tex penetrance in ced-3(lf) animals) is
provided. Bona fide candidates for cell extrusion
regulation should not produce a Tex phenotype in wild-type animals, as cell
extrusion does not occur in wild-type embryos. A Tex phenotype in wild-type
animals could occur from other effects of RNAi against cell cycle genes,
such as excessive proliferation leading to multiple excretory cells. Such
proliferation is likely the case for lin-23, as RNAi
against lin-23 has been previously described to cause
excessive proliferation51.
The 13 other genes are good candidates to be regulators of cell extrusion by
the criterion of dependence of the Tex phenotype on the loss of function of
ced-3.