par-4 mutant embryos had an increased number of cytoplasmic ANI-2 puncta and displayed cortical accumulations of ANI-2, mainly at the membrane between the two blastomeres. Cortical ANI-2 was detectable in less than 10% of wild-type embryos but in 85% of
par-4 mutant embryos. We also observed that ANI-2 accumulated in the midbodies formed following abnormal cytokinetic furrows in
par-4 mutants). These results indicate that ANI-2 localizes to the cortex when PAR-4 activity is compromised and suggest that PAR-4 acts upstream of ANI-2, regulating acto- myosin contractility by preventing ectopic accumulation of ANI-2 at the cortex.