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Prdm12 is a key transcription factor in nociceptor neurogenesis. Mutations of Prdm12 cause congenital insensitivity to pain (CIP) from failure of nociceptor development. However, precisely how deletion of Prdm12 during development or adulthood affects nociception is unknown. Here, we employ tissue- and temporal-specific knockout mouse models to test the function of Prdm12 during development and in adulthood. We find that constitutive loss of Prdm12 causes deficiencies in proliferation during sensory neurogenesis. We also demonstrate that conditional knockout from dorsal root ganglia (DRGs) during embryogenesis causes defects in nociception. In contrast, we find that, in adult DRGs, Prdm12 is dispensable for most pain-sensation and injury-induced hypersensitivity. Using transcriptomic analysis, we find mostly unique changes in adult Prdm12 knockout DRGs compared with embryonic knockout and that PRDM12 is likely a transcriptional activator in the adult. Overall, we find that the function of PRDM12 changes over developmental time.
In humans, many cases of congenital insensitivity to pain (CIP) are caused by mutations of components of the NGF/TrkA signaling pathway, which is required for survival and specification of nociceptors and plays a major role in pain processing. Mutations in PRDM12 have been identified in CIP patients that indicate a putative role for this transcriptional regulator in pain sensing. Here, we show that Prdm12 expression is restricted to developing and adult nociceptors and that its genetic ablation compromises their viability and maturation. Mechanistically, we find that Prdm12 is required for the initiation and maintenance of the expression of TrkA by acting as a modulator of Neurogenin1/2 transcription factor activity, in frogs, mice, and humans. Altogether, our results identify Prdm12 as an evolutionarily conserved key regulator of nociceptor specification and as an actionable target for new pain therapeutics.
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