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NPAS3 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Aliases | NPAS3 , neuronal PAS domain protein 3, MOP6, PASD6, bHLHe12 | ||||||||||||||||||||||||||||||||||||||||||||||||||
External IDs | OMIM: 609430; MGI: 1351610; HomoloGene: 8461; GeneCards: NPAS3; OMA:NPAS3 - orthologs | ||||||||||||||||||||||||||||||||||||||||||||||||||
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NPAS3 or Neuronal PAS domain protein 3 is a brain-enriched transcription factor belonging to the bHLH-PAS superfamily of transcription factors, the members of which carry out diverse functions, including circadian oscillations, neurogenesis, toxin metabolism, hypoxia, and tracheal development. NPAS3 contains a basic helix-loop-helix structural motif and two PAS domain, like the other proteins in the superfamily.
It functions as an heterodimer by binding ARNT2, another memeber of the bHLH-PAS superfamily [5] .
NPAS3 harbors the largest cluster of human accelerated regions, suggesting it may have played a key role in human evolution [6] . Among this accelerated elements, HAR202 is particularly fascinating due to its differential activity between modern humans and archaic species, even though it has only been reported in animal reporter assays [7] .
From the first set of human accelerated regions described in 2006, NPAS3locus overlaps one of the most accelerated sequences, HAR21 . [8]
NPAS1 and NPAS3-deficient mice display behavioral abnormalities typical to the animal models of schizophrenia. [9] Targeting the gene in astrocytes leads to autistic-like behaviours such as reduced vocalization and socialization [10] .
According to the same study, NPAS1 and NPAS3 disruption leads to reduced expression of reelin, which is also consistently found to be reduced in the brains of human patients with schizophrenia and psychotic bipolar disorder.
Recent advances in mouse models have further characterized NPAS3 function and identified key roles in astrogenesis, adult neurogenesis and in inhibitory interneurons differentiation [10] [11] [12] .
Disruption of NPAS3 was found in one family affected by schizophrenia [13] and NPAS3 gene is thought to be associated with psychiatric illness and learning disability. [14] [15] In a genetic study of several hundred subjects conducted in 2008, interacting haplotypes at the NPAS3 locus were found to affect the risk of schizophrenia and bipolar disorder. [16]
In a pharmacogenetical study, polymorphisms in NPAS3 gene were highly associated with response to iloperidone, a proposed atypical antipsychotic. [17]