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Neuronal PAS domain-containing protein 1 (NPAS1)
- Target
- NPAS1
- Molecular classification
- Transcription factor, Basic helix-loop-helix-PAS (bHLH-PAS) family protein
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Overview
Neuronal PAS domain-containing protein 1 (NPAS1) is a transcription factor of the basic helix-loop-helix-PAS (bHLH-PAS) family, expressed mainly in inhibitory interneurons within the central nervous system. It forms functional transcriptional complexes by heterodimerizing with the aryl hydrocarbon receptor nuclear translocator (ARNT), allowing binding to specific DNA response elements to regulate gene expression. NPAS1 lacks a canonical transcription activation domain and primarily acts as a transcriptional repressor, notably suppressing tyrosine hydroxylase expression. Genetic disruption or deficiency of NPAS1 is linked to behavioral and regulatory abnormalities in animal models and has been implicated in several human neuropsychiatric disorders including schizophrenia, autism spectrum disorders, and bipolar disorder. Recent structural analyses revealed multiple putative ligand-binding cavities in NPAS1, suggesting feasibility for small-molecule modulation, though no approved therapeutic agents currently target this protein directly.
- Other names
- Neuronal PAS domain protein 1BHLHE11MOP5PASD5neuronal PAS1bHLHe11Basic-helix-loop-helix-PAS protein MOP5Class E basic helix-loop-helix protein 11Member of PAS protein 5PAS domain-containing protein 5member of PAS superfamily 5
02
Biological functions
Regulation of gene transcriptionTranscriptional repression (notably, represses tyrosine hydroxylase expression)Potential signal integration via ligand-binding PAS domainsHeterodimerizes with ARNT to regulate gene expression
03
Disease associations
Neuropsychiatric disorders (including schizophrenia, autism spectrum disorders, bipolar disorder)Other nervous system diseases (implicated through mouse knockout models)
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Safety considerations
Potential risk of neuropsychiatric effects due to central nervous system (CNS) roleLikely effects on inhibitory interneuron function, particularly in brain circuits relevant to cognition and mood
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