Required for morphological differentiation of postmitotic neurons during postembryonic brain development (PubMed:17055440). Ensures production of appropriate neuron subtypes within a lineage by preventing precocious generation of late neuronal types of that lineage (PubMed:17055440). Acts as a downstream mediator of the transcriptional activator Stat92e and is required for the development of the eye-antennal disk which gives rise to the adult eye, antenna and head capsule, for transcriptional repression of the Notch receptor ligand Ser and for the self-renewal of cyst stem cells in the testis (PubMed:20412771). In the adult testis, maintains the male identify of adult somatic cyst stem cells (PubMed:25453558, PubMed:29389999). Represses expression and alternative splicing of transformer pre-mRNA, resulting in the production of the male-specific isoform of transcription factor dsx which ensures male-specific transcription of target genes (PubMed:25453558, PubMed:29389999). Plays a role in actin nuclear localization through its involvement in repressing the expression of the kinase Cdi (PubMed:26021350). This maintains the cofilin/actin-depolymerizing factor homolog tsr in its unphosphorylated state which is required for actin nuclear import (PubMed:26021350). Broadly expressed in the developing larval central nervous system (at protein level) (PubMed:17055440). Expressed in the larval lymph gland and circulating hemocytes (at protein level) (PubMed:20412771). Expressed in all cell types of the adult testis stem cell niche but not detected in somatic cells of the adult ovary (at protein level) (PubMed:29389999). In the testis, expressed at high levels in cyst stem cells and early cyst cells and, at lower levels, in germline stem cells (at protein level) (PubMed:20412771). In the mushroom body, abundant at early larval stages, becomes much reduced in wandering larvae and is undetectable in young pupae. Expressed at higher levels in postmitotic neurons born at early postembryonic developmental stages than in later-born neurons of the same lineage. Inappropriate morphogenesis of larval mushroom body neurons with early-born neurons adopting the fate of late-born neurons from the same lineage (PubMed:17055440). Malformed eyes and head capsules due to defects in eye progenitor cells (PubMed:20412771). RNAi-mediated knockdown in adult cyst stem cells and early cyst cells results in the appearance of cells resembling ovarian follicle cells throughout the testis (PubMed:25453558). RNAi-mediated knockdown in adult cyst stem cells results in loss of expression of the male-specific isoform of transcription factor dsx and leads to male sterility (PubMed:29389999). RNAi-mediated knockdown in imaginal wing disks results in decreased levels of nuclear actin (PubMed:26021350). RNAi-mediated knockdown in adult ovary somatic stem cells results in ovaries which are morphologically indistinguishable from the wild-type while ectopic expression in the adult ovary is sufficient to induce male fate in somatic cells (PubMed:26811385).