The production of the second messenger molecules diacylglycerol (DAG) and inositol 1,4,5-trisphosphate (IP3) is mediated by activated phosphatidylinositol-specific phospholipase C enzymes (PubMed:9497345). plc-1 is a bifunctional enzyme which also regulates small GTPases of the Ras superfamily through its Ras guanine-exchange factor (RasGEF) activity (By similarity). By activating IP3 receptor itr-1-mediated intracellular Ca(2+) release via the production of IP3, regulates ovulation by controlling contraction and/or dilation of the distal spermatheca valve during oocyte entry and the timing of the dilation of the spermatheca-uterine valve during oocyte exit (PubMed:23671426, PubMed:15355798, PubMed:18369461, PubMed:15194811). In a similar manner, plays an essential role in epidermal morphogenesis by regulating migration of epidermal cells during ventral closure and to a lesser extent by regulating epidermal cell dorsal intercalation (PubMed:18369461). Involved in the immune response to S.aureus bacterium by activating kinase dkf-1 via the production of DAG which in turn activates transcription factor hlh-30 (PubMed:27184844). In ASER neurons, required for adjusting the orientation behavior in salt gradients based on the memory of previous salt concentration encountered (PubMed:23887678). a 1,2-diacyl-sn-glycero-3-phospho-(1D-myo-inositol-4,5-bisphosphate) + H2O = 1D-myo-inositol 1,4,5-trisphosphate + a 1,2-diacyl-sn-glycerol + H(+) Interacts (via Ras-associating domain 1) with let-60 (in GTP-bound form). Expressed in the spermatheca, vulva, intestine and excretory cells (PubMed:15355798). Expressed in sensory neurons AWC, AFD, ASE, ASG and BAG, interneurons, ventral nerve cord neurons and tail neurons (PubMed:15355798, PubMed:23887678). Expressed in body muscles (PubMed:23887678). Only Ras-associating 1 domain is involved in the binding to let-60. RNAi-mediated knockdown results in 52 percent of animals arrested at the embryonic stage (PubMed:18369461). RNAi-mediated knockdown in larvae causes a severe decrease in brood size (PubMed:15194811). In 20 percent of animals, spermatheca dilatation is impaired causing oocyte retention in the gonad and persistent triggering of ovulatory contractions (PubMed:15194811). In L4 larvae, results in a shortened lifespan (PubMed:27184844). Prevents transcription factor hlh-30 nuclear translocation and increases lifespan in response to S.aureus infection (PubMed:27184844).