Essential for both cleavage and polyadenylation of pre-mRNA 3' ends (By similarity). Involved in neuron development, probably by regulating pre-mRNA 3'-end processing (PubMed:20530551). Also localizes to a small subnuclear ring in neurons. In neurons, partially co-localizes with sydn-1 in the nucleus. Expressed in neurons and in some non-neuronal cells. The C-terminus is required for the regulation of synapse and axon development. RNAi-mediated knockdown in a sydn-1, eri-1 and syd-2 mutant background suppresses ectopic axon branches and synapse defects and causes sterility. (Probable). Belongs to the WD repeat WDR33 family.