Sequence-specific DNA-binding transcription factor (By similarity). Plays a role in oocyte development, acting cell-autonomously in the somatic gonad (PubMed:20736289). Involved in negative regulation of oocyte MAPK activation and inhibits oocyte maturation and ovulation (PubMed:20736289). Perinuclear localization only observed in sperm. Expressed in sheath cells and distal tip cells of the somatic gonad, as well as in the intestine and sperm (at protein level) (PubMed:20736289). Expression not observed in oocytes (at protein level) (PubMed:20736289). RNAi-mediated knockdown causes abnormalities in oocyte development, including degrading oocytes in the proximal gonadal arm and ectopic developing oocytes in the distal arm (PubMed:20736289). RNAi-mediated knockdown targeted to the soma, on an rrf-1 mutant background, exhibits only a slight increase in the frequency of oocyte defects (PubMed:20736289). Belongs to the EGR C2H2-type zinc-finger protein family.