INTS2

INTS2 is a subunit of the Integrator complex implicated in the transcriptional control of neural lineage progression, as established through its Drosophila ortholog intS2 (PMID:31018143). INP-specific knockdown of intS2 causes intermediate neural progenitors to dedifferentiate back into type II neuroblasts, producing ectopic neural stem cells and identifying INTS2 as required to maintain intermediate progenitor identity during neural development (PMID:31018143). Beyond this ortholog-based role in safeguarding progenitor identity through Integrator function, no further mechanistic detail—biochemical activity, direct partners, or human-specific function—has been characterized in the available corpus.

1. 2019 Medium

   Established that an Integrator subunit is required not just for general transcription but specifically to lock in intermediate progenitor identity and prevent reversion to a stem-cell state.

   Evidence INP-specific RNAi knockdown of the Drosophila ortholog intS2 with quantification of ectopic type II neuroblast formation, alongside genetic interaction and DamID analysis of Integrator subunits

   PMID:31018143

   Open questions at the time

   • The direct transcriptional targets through which INTS2 maintains INP identity were not defined
   • Evidence rests on the Drosophila ortholog; the human INTS2 function was not directly tested
   • The biochemical activity of INTS2 within the Integrator complex was not resolved

• How INTS2 contributes biochemically to Integrator function and whether its progenitor-maintenance role is conserved in mammalian neurogenesis remain unresolved.
• No human or mammalian functional data in the corpus
• No molecular activity, substrate, or structural assignment for INTS2
• Direct physical partners within the Integrator complex not mapped in these findings