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ARNT2
aryl hydrocarbon receptor nuclear translocator 2
ARNT2 is located on the long (q) arm of chromosome 15, at band 15q25.1. Arm ratio per GRCh38 - banding schematic.
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Overview
ARNT2 (aryl hydrocarbon receptor nuclear translocator 2) is located on chromosome 15 and produces a protein involved in transcriptional regulation. The protein functions primarily in the central nervous system, where it forms partnerships with other transcription factors to control the expression of genes important for neurological development and function.
Research suggests that ARNT2 participates in pathways that allow cells to adapt to changing oxygen levels and other environmental conditions. The gene's expression pattern is most prominent in brain tissue, indicating specialised functions in neural contexts. Understanding ARNT2's molecular roles may provide insight into neurodevelopmental processes, though clinical applications remain under investigation.
What the gene does
The ARNT2 protein acts as a transcriptional partner, forming heterodimeric complexes with other basic helix-loop-helix transcription factors. These partnerships enable the protein to bind specific DNA sequences and modulate the activity of target genes. In the nervous system, ARNT2 contributes to pathways that regulate neuronal differentiation and the maintenance of specific neuronal populations.
Evidence suggests the protein plays a role in cellular responses to hypoxia (low oxygen conditions), working alongside related family members to activate genes involved in metabolic adaptation. The protein's function appears particularly important during embryonic brain development, when precise control of gene expression patterns is essential for establishing neural circuits. ARNT2 may also contribute to ongoing gene regulation in the adult brain, though the full scope of its activities in mature neural tissue remains an active area of research.
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Chromosome location
ARNT2 is located at chromosomal position 15q25.1 on the long arm of chromosome 15. This genomic region contains the complete gene sequence required to produce the ARNT2 protein. The specific arrangement of exons and regulatory elements within this locus determines when and where the gene is expressed across different tissues and developmental stages.
Protein structure
Domain architecture has not been experimentally characterised in detail for this protein. The ARNT2 protein shares structural features with other members of the basic helix-loop-helix-PAS transcription factor family, which typically contain domains that facilitate DNA binding and protein-protein interactions, though specific domain boundaries and functional regions for ARNT2 require further experimental definition.
Key variants
Genetic variants in ARNT2 may affect the protein's ability to regulate gene expression in neural tissue. Changes in the gene sequence can potentially influence protein stability, interaction with partner molecules, or DNA-binding capacity. The clinical significance of most ARNT2 variants remains under investigation, as research continues to clarify which changes meaningfully affect protein function.
Sample of pathogenic variants
7 pathogenic / likely-pathogenic variants from ClinVar, ranked by review status (expert-panel-reviewed first). This is a sample; recurrent founder variants in a specific population may not appear here - see the full ClinVar listing via the link above.
| Variant (HGVS) | Protein change | Classification | Evidence | Associated condition |
|---|---|---|---|---|
c.475C>T | p.Arg159Ter | Pathogenic/Likely pathogenic | ★★☆☆ | Webb-Dattani syndrome |
g.(?_80869187)_(80869326_?)del | - | Pathogenic | ★☆☆☆ | not provided |
c.1204C>T | p.Arg402Ter | Pathogenic | ★☆☆☆ | not provided |
c.523C>T | p.Gln175Ter | Pathogenic | ★☆☆☆ | not provided |
c.835del | p.Val279fs | Pathogenic | ★☆☆☆ | not provided |
c.908_911dup | p.Gln305fs | Pathogenic | ★☆☆☆ | not provided |
c.1372_1373dup | p.Tyr459fs | Pathogenic | - | Webb-Dattani syndrome |
Evidence stars indicate ClinVar review status. Individual variant interpretation should always be performed by a qualified clinical laboratory - many variants remain classified as Variants of Uncertain Significance (VUS) pending more research.
Associated conditions
Currently, no specific inherited conditions have been definitively linked to pathogenic variants in ARNT2 in major clinical databases. Research into the gene's role in neurodevelopmental processes continues, and future studies may identify associations between ARNT2 variants and particular neurological phenotypes. The gene's expression pattern in brain tissue suggests it may be relevant to conditions affecting nervous system development or function, though establishing such connections requires rigorous clinical and molecular evidence.
No disease links recorded for this gene in our reference set.
UK clinical status
Frequently asked questions
What does the ARNT2 gene do?
ARNT2 encodes a transcription factor protein that regulates gene expression, particularly in the developing and adult nervous system. The protein forms partnerships with other molecules to control which genes are switched on or off in neural cells.
Where in the body is ARNT2 most active?
ARNT2 is predominantly expressed in brain tissue, where it contributes to neurological development and function. The gene's activity is particularly notable in the central nervous system during embryonic development and in specific brain regions in adults.
Is ARNT2 tested on UK NHS genetic panels?
ARNT2 does not currently appear on NHS Genomic Medicine Service gene panels for routine clinical testing. The gene's clinical utility for diagnostic purposes is still being evaluated through ongoing research.