Neuronal PAS domain protein 4 (NPAS4)

Neuronal PAS domain protein 4 (NPAS4) is an activity-dependent transcription factor belonging to the basic helix-loop-helix-PER-ARNT-SIM (bHLH-PAS) family, encoded by the NPAS4 gene. It is rapidly induced in neurons following synaptic activity and plays a key role in regulating the transcription of genes that control inhibitory synapse development, synaptic plasticity, and the excitatory–inhibitory (E/I) balance critical for neural circuit function. NPAS4 acts mainly in the brain and forms heterodimers with ARNT and ARNT2, enabling it to bind DNA and modulate the expression of target genes such as BDNF. Dysregulation or loss of NPAS4 function is implicated in various central nervous system illnesses, including epilepsy, neuropsychiatric, and metabolic diseases. Structural analyses reveal its PAS domains possess ligand-accessible pockets, presenting potential opportunities for therapeutic targeting, although no approved drugs directly target this molecule at present.

Other names

Neuronal PAS domain-containing protein 4NPAS4BHLHE79NXFPASD10Le-PASbHLHe79Class E basic helix-loop-helix protein 79HLH-PAS transcription factor NXFPAS domain-containing protein 10neuronal PAS4

Not established in the clinic; potential mechanisms would involve small molecules modulating NPAS4 dimerization, transcriptional activity, or activity-dependent gene regulation