Transcriptional repressor which promotes neuronal differentiation during embryonic and postembryonic neurogenesis (PubMed:31386623). Together with components of the MuvB corepressor complex, negatively regulates the expression of non-neuronal genes during neurogenesis (PubMed:31386623). Required for the generation of postembryonic neurons from epidermal cells (PubMed:31386623). Interacts with MuvB corepressor complex components lin-9, lin-52 and rba-1; the interaction is required to suppress the activation of non-neuronal genes in neurons (PubMed:31386623). Interacts with sin-3; the interaction is weak (PubMed:31386623). Expressed throughout embryonic development, but rarely expressed in lineages that do not produce neurons (PubMed:31386623). First expressed in neural precursors at the mid-gastrula stage of embryogenesis (PubMed:31386623). Highly expressed during the late gastrula to lima-bean embryonic stages, but weakly expressed in subsequent embryonic stages (PubMed:31386623). Post hatching, expressed in few neuronal nuclei and transiently expressed in postembryonic neuroectoblasts (PubMed:31386623). Not expressed in postmitotic neurons (PubMed:31386623). In L1 larvae, expressed in neurons and glia, but not in non-neuronal precursors (PubMed:31386623). In L2 stage larvae, expressed in the rectal epithelial Y cell (PubMed:31386623). Knockout in the rectal epithelial Y cell results in impaired formation of the PDA motor neuron (PubMed:31386623). Knockout in Pn lineages (the precursor cells of the ventral epidermis of newly hatched animals) results in the defective formation of ventral cord motor neurons (PubMed:31386623). Belongs to the MYT1 family.