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NR2E3
nuclear receptor subfamily 2 group E member 3
NR2E3 is located on the long (q) arm of chromosome 15, at band 15q23. Arm ratio per GRCh38 - banding schematic.
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Overview
NR2E3 is located on chromosome 15 and encodes a member of the nuclear receptor superfamily of transcription factors. The protein plays a critical role in retinal development, specifically in determining photoreceptor cell fate and maintaining the distinction between rod and cone photoreceptors. During retinal development, NR2E3 acts as both a transcriptional repressor and activator, suppressing cone-specific genes whilst promoting rod photoreceptor gene expression. Pathogenic variants in this gene can disrupt normal photoreceptor development, leading to a spectrum of inherited retinal conditions characterised by progressive vision loss, night blindness, or altered colour perception.
What the gene does
The NR2E3 protein functions as a ligand-dependent transcription factor that regulates gene expression in photoreceptor cells of the retina. It binds to specific DNA sequences in the regulatory regions of target genes, modulating their transcription. NR2E3 plays a dual regulatory role: it acts as a repressor of genes normally expressed in cone photoreceptors whilst simultaneously activating genes required for rod photoreceptor function and survival. This regulatory activity is essential for establishing and maintaining the correct ratio of rod to cone photoreceptors during retinal development. The protein achieves its regulatory effects by recruiting co-repressor and co-activator complexes to chromatin, thereby influencing the accessibility of DNA to the transcriptional machinery. Through these mechanisms, NR2E3 helps ensure proper visual function across different light conditions, with rods specialised for low-light vision and cones mediating colour perception and high-acuity vision.
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Chromosome location
NR2E3 is located on the long arm of chromosome 15 at position 15q23. The gene spans a region of genomic DNA that encodes a protein of 410 amino acids. Chromosome 15 contains numerous genes involved in various cellular processes, and the 15q23 region specifically harbours several genes associated with sensory function and development.
Protein structure
The NR2E3 protein comprises 410 amino acids organised into functional domains characteristic of nuclear receptor family members. The N-terminal region contains a Nuclear receptor DNA-binding domain spanning amino acids 44 to 120, which includes two NR C4-type zinc finger motifs located at positions 47-67 and 83-108. These zinc finger structures enable the protein to recognise and bind specific DNA sequences in target gene promoters. A disordered region extends from amino acids 118 to 162, providing flexibility between structured domains. The C-terminal portion of the protein contains an NR LBD (ligand-binding domain) from amino acids 169 to 410, which mediates interactions with regulatory molecules and co-factor proteins. An additional disordered region at positions 193-215 lies within the ligand-binding domain. This modular architecture allows NR2E3 to integrate multiple regulatory signals and coordinate transcriptional responses in developing photoreceptor cells.
Key variants
Variants in NR2E3 include missense changes, nonsense mutations, small insertions and deletions, and splice-site alterations. Pathogenic variants may disrupt DNA binding, impair ligand recognition, or destabilise the protein structure. The functional consequences of NR2E3 variants depend on their location within the gene and the specific domain affected, with variants in the DNA-binding domain and ligand-binding domain often associated with more severe phenotypes.
Sample of pathogenic variants
10 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.1095C>G | p.Pro365= | Pathogenic/Likely pathogenic | ★★☆☆ | Retinal dystrophy |
c.1127del | p.Pro376fs | Pathogenic/Likely pathogenic | ★★☆☆ | Enhanced S-cone syndrome |
c.119-2A>T | - | Pathogenic/Likely pathogenic | ★★☆☆ | Enhanced S-cone syndrome |
c.1220T>A | p.Met407Lys | Pathogenic/Likely pathogenic | ★★☆☆ | Enhanced S-cone syndrome |
c.225_245+6del | - | Pathogenic/Likely pathogenic | ★★☆☆ | Enhanced S-cone syndrome |
c.228del | p.Arg77fs | Pathogenic | ★★☆☆ | not provided |
c.259dup | p.Ala87fs | Pathogenic | ★★☆☆ | NR2E3-related disorder |
c.302_325del | p.Gln101_Cys108del | Pathogenic/Likely pathogenic | ★★☆☆ | Enhanced S-cone syndrome |
c.336del | p.Gly112_Met113insTer | Pathogenic/Likely pathogenic | ★★☆☆ | Enhanced S-cone syndrome |
c.583del | p.Ile195fs | Pathogenic | ★★☆☆ | Enhanced S-cone 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
Pathogenic variants in NR2E3 are associated with a spectrum of inherited retinal disorders affecting photoreceptor development and function. These conditions typically present with progressive vision impairment, night blindness, or altered visual field perception. The severity and specific features depend on the nature of the genetic variant and may range from early-onset severe vision loss to milder, later-onset presentations. Inheritance patterns associated with NR2E3-related conditions can vary, reflecting the diverse molecular consequences of different pathogenic variants.
No disease links recorded for this gene in our reference set.
UK clinical status
NR2E3 is included on the NHS Genomic Medicine Service Retinal Disorders panel with green (high evidence) classification under code R32. This green designation indicates strong evidence supporting the gene's role in inherited retinal conditions, meaning that analysis of NR2E3 may be offered through NHS genomic testing for individuals with relevant clinical features. Healthcare professionals use this panel to guide genetic testing decisions for patients presenting with retinal disorders, helping to establish molecular diagnoses and inform clinical management.
Sources: NHS GMS PanelApp · Genomics England PanelApp · NHS National Genomic Test Directory
Frequently asked questions
What does the NR2E3 protein do in the eye?
The NR2E3 protein acts as a transcription factor in photoreceptor cells of the retina, controlling which genes are switched on or off. It helps ensure that rod photoreceptors (which detect light in dim conditions) develop properly whilst suppressing cone photoreceptor genes, thereby maintaining the correct balance of different photoreceptor types required for normal vision.
How are conditions related to NR2E3 inherited?
Inheritance patterns for NR2E3-related retinal conditions can vary depending on the specific variant and its functional effect. Some pathogenic variants are inherited in an autosomal recessive manner, whilst others may show autosomal dominant inheritance, meaning the pattern of inheritance within families can differ.
Is genetic testing for NR2E3 available through the NHS?
Yes, NR2E3 analysis is available through the NHS Genomic Medicine Service as part of the Retinal Disorders panel for individuals meeting clinical criteria. A healthcare professional with genetics expertise can assess eligibility and arrange testing where appropriate.