Possible transcriptional regulator (Probable). Involved in promoting segregation of chromosomes during meiosis, perhaps acting downstream of the let-60 RAS / mpk-1 MAPK signaling pathway (PubMed:17096596). Expressed in proximal gonad. Superficially wild-type, with a normal brood size, but drastic reduction in brood size when grown at a permissive temperature of 20 degrees Celsius in an mpk-1 mutant background. Double mutant mpk-1;pzf-1 shows meiotic chromosome non-disjunction, increased embryonic lethality and also an abnormal male:hermaphrodite ratio, at 23 degrees Celsius.