Affinage

CNGA3

Cyclic nucleotide-gated channel alpha-3 · UniProt Q16281

Length
694 aa
Mass
78.8 kDa
Annotated
2026-06-09
75 papers in source corpus 26 papers cited in narrative 27 extracted findings
Cross-family judge vs UniProt: Affinage preferred faithfulness: 7/7 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

CNGA3 encodes the pore-forming A-subunit of the cone photoreceptor cyclic nucleotide-gated channel, which is selectively required for cone phototransduction: its genetic deletion abolishes cone-mediated photoresponses while leaving the rod pathway intact and drives progressive cone degeneration (PMID:10377453). The native cone channel is a heterotetramer in which CNGA3 directly associates with CNGB3, with CNGB3 in turn required for normal CNGA3 biosynthesis (PMID:18665891, PMID:19767295). CNGA3 opens upon binding cGMP through its cyclic nucleotide-binding domain, and a ligand-dependent conformational change in the C-terminus together with N–C intersubunit coupling and a stabilizing C-terminal leucine-zipper coiled-coil controls channel gating and assembly (PMID:20088482, PMID:23552282, PMID:26407004). Functionally, the channel sets cone cGMP homeostasis—AAV-mediated CNGA3 re-expression normalizes cGMP levels and rescues cone function—and its loss raises cGMP, triggering Prkg2-dependent ER stress, the unfolded-protein response, and apoptotic cone death (PMID:20628362, PMID:33374621). CNGA3 loss also impairs cone opsin trafficking to outer segments and delays cone somatic migration and synaptic pedicle formation (PMID:15790924), with secondary degradation of rod synaptic integrity and provocation of ectopic cone-bipolar/rod synapses (PMID:22247469, PMID:16687517). The large allelic series of achromatopsia and cone-dystrophy mutations resolves into two dominant pathogenic mechanisms: altered gating/ligand affinity and, more commonly, protein misfolding with ER retention or cytosolic aggregation and reduced surface expression, the latter partially correctable by chemical chaperones or reduced temperature (PMID:15743887, PMID:15980212, PMID:17693388, PMID:18521937, PMID:20238023); CNGA3 gene dosage further modulates disease severity in a digenic interaction with hypomorphic CNGB3 (PMID:30418171). Beyond the retina, CNGA3 acts in spinal inhibitory interneurons as a negative modulator of NO/cGMP-dependent inflammatory pain sensitization (PMID:21813679) and contributes to coolness-evoked responses of Grueneberg ganglion neurons (PMID:20165899).

Mechanistic history

Synthesis pass · year-by-year structured walk · 19 steps
  1. 1999 High

    Established that CNGA3 is specifically and non-redundantly required for cone, but not rod, phototransduction, defining its core retinal role.

    Evidence Cnga3 knockout mouse with ERG and histology

    PMID:10377453

    Open questions at the time
    • Did not define molecular composition of the channel
    • Mechanism of progressive cone degeneration unresolved
  2. 2005 High

    Showed CNGA3 loss disrupts post-transcriptional cone biology—opsin trafficking, somatic migration, and synaptic pedicle formation—beyond simple loss of channel current.

    Evidence IHC, EM, and RT-PCR in Cnga3-/- mice

    PMID:15790924

    Open questions at the time
    • Did not establish whether trafficking defects are direct or secondary to absent phototransduction
    • No molecular link to a degeneration effector
  3. 2005 High

    Began parsing disease mutations into gating-altering versus surface-expression-reducing classes, founding the genotype-mechanism framework.

    Evidence Patch-clamp and confocal surface expression of mutant subunits in oocytes/HEK cells

    PMID:15743887 PMID:15980212

    Open questions at the time
    • Limited number of mutations examined
    • S1-domain mutants not rescued by CNGB3 co-expression—folding pathway unresolved
  4. 2007 High

    Demonstrated systematically that most rod-monochromacy mutations cause complete loss of cGMP-activated current, while CNBD mutations bidirectionally shift cGMP affinity.

    Evidence Patch-clamp of 39 missense mutants in HEK293

    PMID:17693388

    Open questions at the time
    • Did not distinguish gating defects from trafficking defects for all mutants
    • No structural model for affinity shifts
  5. 2008 High

    Identified protein folding/trafficking failure—correctable by chemical chaperones or reduced temperature—as a dominant pathogenic mechanism, suggesting therapeutic tractability.

    Evidence Patch-clamp, Ca2+ imaging and immunocytochemistry of mutants in HEK293

    PMID:18445228 PMID:18521937

    Open questions at the time
    • Chaperone rescue not validated in cones in vivo
    • Which folding/quality-control machinery handles CNGA3 is unknown
  6. 2008 High

    Defined the native channel as a CNGA3/CNGB3 heterotetramer through direct interaction, establishing subunit stoichiometry in tissue.

    Evidence Co-IP and chemical cross-linking in Nrl-/- mouse retina

    PMID:18665891

    Open questions at the time
    • Exact A:B subunit ratio not fixed
    • No association with NCKX2 detected—Ca2+ extrusion coupling unresolved
  7. 2009 High

    Showed CNGB3 regulates CNGA3 protein and mRNA levels, explaining how CNGB3 deficiency produces cone dysfunction partly via CNGA3 downregulation.

    Evidence ERG, western blot, RT-PCR, IHC in Cngb3-/- mice

    PMID:19767295

    Open questions at the time
    • Mechanism of CNGB3-dependent CNGA3 stabilization unknown
    • Transcriptional vs post-transcriptional contribution not separated
  8. 2010 High

    Linked C-terminal disease mutations to a ligand-induced conformational change, providing a biophysical basis for gating beyond ligand binding.

    Evidence Cell-based functional assays plus circular dichroism of purified C-terminal domains

    PMID:20088482

    Open questions at the time
    • CD performed on isolated domains, not full-length channel
    • Conformational change not visualized in intact channel
  9. 2010 High

    Demonstrated that CNGA3 controls cone cGMP homeostasis and that gene replacement rescues function, providing proof-of-concept for therapy and direct evidence of the channel's cGMP-regulatory role.

    Evidence AAV gene delivery with ERG, IHC, and cGMP measurement in Cnga3-/- mice

    PMID:20628362

    Open questions at the time
    • Did not define the downstream death pathway driven by elevated cGMP
    • Durability of rescue not addressed here
  10. 2010 Medium

    Extended CNGA3 function beyond photoreceptors to Grueneberg ganglion coolness sensing, indicating a broader cGMP-transduction role.

    Evidence In situ hybridization and Ca2+ imaging of GG neurons in Cnga3-/- mice

    PMID:20165899

    Open questions at the time
    • Upstream coolness-sensing receptor coupling to CNGA3 unknown
    • Channel composition in GG neurons not defined
  11. 2011 High

    Placed CNGA3 in spinal inhibitory interneurons as a negative modulator of NO/cGMP inflammatory pain sensitization, defining a non-retinal physiological role.

    Evidence In situ hybridization, behavioral pain assays, and intrathecal pharmacology in Cnga3-/- mice

    PMID:21813679

    Open questions at the time
    • Channel partners and stoichiometry in spinal neurons not defined
    • Cellular mechanism of inhibitory modulation unresolved
  12. 2012 High

    Showed cone CNG channel function is required to maintain rod synaptic structure and viability, revealing non-cell-autonomous retinal consequences of CNGA3 loss.

    Evidence ERG, IHC, EM, and western blot time course in Cnga3-/- mice

    PMID:22247469

    Open questions at the time
    • Signal mediating cone-to-rod damage unidentified
    • Ectopic synapse remodeling mechanism only partly defined
  13. 2012 Medium

    Reported CNGA3 expression in cochlear/vestibular hair cells with Ca2+-dependent C-terminal binding to EMILIN1, hinting at a structural/mechanosensory context.

    Evidence Yeast two-hybrid, SPR, pulldown, and immunolocalization

    PMID:22248097

    Open questions at the time
    • Functional consequence of CNGA3-EMILIN1 binding not established
    • Hair-cell channel role not demonstrated physiologically
  14. 2013 High

    Resolved that intersubunit N–C coupling controls phosphoinositide regulation of the channel, with the leucine-zipper mutation L633P altering this allosteric communication.

    Evidence Excised-patch electrophysiology, co-IP, and thermodynamic linkage with tandem-dimer constructs

    PMID:23552282

    Open questions at the time
    • Endogenous PIP2/PIP3 regulation of cone channels in vivo not quantified
    • Structural geometry of N-C intersubunit contact unknown
  15. 2013 Medium

    Mapped a Ca2+-dependent N-terminal interaction with the tip-link protein CDH23+68, competed by Myosin VIIa, extending CNGA3 interactions in hair-cell stereocilia.

    Evidence Yeast two-hybrid, pulldown, and SPR

    PMID:23329832

    Open questions at the time
    • Functional consequence in hair cells not established
    • In vivo relevance of the competition with Myosin VIIa untested
  16. 2015 High

    Established a specific R424–E306 salt bridge as essential for gating via charge-reversal rescue, and showed leucine-zipper deletion blocks trimeric subunit assembly.

    Evidence In vitro electrophysiology with charge-reversal mutagenesis, MD simulation, and canine ERG

    PMID:26407004

    Open questions at the time
    • Salt-bridge model from simulation, not experimental structure
    • Assembly intermediate states not characterized
  17. 2018 High

    Revealed allele-level phenomena: an alternative downstream translation start produces a functional but non-compensating short isoform, and CNGA3 dosage modulates digenic disease severity with hypomorphic CNGB3.

    Evidence Western blot/Ca2+ influx for isoform; triallelic Cnga3+/- Cngb3R403Q mouse with ERG and human cohort

    PMID:29499183 PMID:30418171

    Open questions at the time
    • Why the short isoform fails to rescue cones unknown
    • Molecular basis of CNGA3 dosage sensitivity not defined
  18. 2020 High

    Identified Prkg2 (cGMP-dependent protein kinase 2) as the downstream effector translating elevated cGMP into ER stress and cone death in CNGA3 deficiency, naming a degeneration pathway.

    Evidence AAV knockdown and genetic double-KO with cone counts and ER-stress markers in Cnga3-/- mice

    PMID:33374621

    Open questions at the time
    • Prkg2 substrates driving apoptosis not identified
    • Connection to opsin trafficking defects unresolved
  19. 2023 High

    Systematically defined the splicing impact of CNGA3 variants, enabling reclassification of variants of uncertain significance.

    Evidence pSPL3 exon-trapping minigene splice assays for 20 variants

    PMID:36801918

    Open questions at the time
    • Minigene splicing may not fully recapitulate cone-specific splicing
    • Predicted PTCs not confirmed at protein level

Open questions

Synthesis pass · forward-looking unresolved questions
  • It remains unresolved how the cone channel's atomic structure, its full quality-control/folding pathway, and the molecular substrates of Prkg2-driven death connect to produce CNGA3-dependent cone survival.
  • No experimental high-resolution structure of the human channel in the corpus
  • Mechanism linking elevated cGMP/Prkg2 to specific apoptotic substrates undefined
  • Non-retinal channel composition and partners (spinal, GG, hair cells, bRG) largely uncharacterized

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0005215 transporter activity 4 GO:0060089 molecular transducer activity 3
Localization
GO:0005886 plasma membrane 4 GO:0005783 endoplasmic reticulum 2
Pathway
R-HSA-162582 Signal Transduction 2 R-HSA-9709957 Sensory Perception 2 R-HSA-5357801 Programmed Cell Death 1
Partners
CDH23CNGB3EMILIN1
Complex memberships
cone cyclic nucleotide-gated channel (CNGA3/CNGB3 heterotetramer)

Evidence

Reading pass · 27 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
1999 Genetic deletion of CNG3 (CNGA3) in mice selectively abolishes cone-mediated photoresponses while leaving the rod pathway completely intact, demonstrating that CNGA3 is specifically required for cone photoreceptor function. Loss of CNGA3 also leads to progressive degeneration of cone photoreceptors but not other retinal cell types. Knockout mouse model; electroretinography; histology Proceedings of the National Academy of Sciences of the United States of America High 10377453
2005 Loss of CNGA3 in mice impairs targeting of cone opsins to outer segments and downregulates phototransduction cascade proteins without affecting transcription of cone-specific genes, indicating CNGA3 is required for post-transcriptional/trafficking processes in cones. Additionally, CNGA3 knockout cones exhibit profoundly delayed postnatal somatic migration and lack normal synaptic pedicles, ultimately inducing apoptotic cell death. Immunohistochemistry; electron microscopy; molecular biology in CNGA3-/- mice Investigative ophthalmology & visual science High 15790924
2005 Progressive cone dystrophy-associated mutations in CNGA3 (N471S and R563H) increase apparent cGMP affinity and relative cAMP efficacy in patch-clamp recordings, while R277C subunits fail to form functional homomeric or heteromeric channels. Cell surface expression is significantly reduced for R563H and R277C but not N471S, indicating that these mutations alter both gating properties and plasma membrane localization of cone CNG channels. Patch-clamp electrophysiology; confocal microscopy of GFP-tagged subunits expressed in Xenopus oocytes and HEK cells American journal of physiology. Cell physiology High 15743887
2005 Transmembrane S1 domain mutations in CNGA3 (Y181C, N182Y, L186F, C191Y) cause loss of channel function and retention of the full-length protein in the endoplasmic reticulum, as shown by patch-clamp recording and immunocytochemistry. Glycerol treatment and co-expression with CNGB3 did not rescue function for these mutants. A control mutant C191S retained cGMP activation but with reduced cooperativity, indicating that S1 is important for inter/intrasubunit communication. Patch-clamp electrophysiology; immunoblot; immunocytochemistry; GFP-tagged CNGA3 in HEK293 cells Investigative ophthalmology & visual science High 15980212
2006 Cone bipolar cells in CNGA3-/- mice form ectopic synapses with rods in the outer plexiform layer in response to lack of cone input. This ectopic synapse formation requires a functional presynaptic photoreceptor, as it does not occur in CNGA3-/-Rho-/- double knockouts where both photoreceptor types are nonfunctional. Intracellular dye injection; specific cell markers; immunohistochemistry in CNGA3-/-, Rho-/-, and double knockout mice The Journal of neuroscience : the official journal of the Society for Neuroscience High 16687517
2007 Patch-clamp analysis of 39 CNGA3 missense mutations associated with rod monochromacy showed 32 of 39 mutants completely lost cGMP-activated current (loss of function). T565M mutation shifted K1/2 for cGMP from 9 µM to 160 µM (reduced affinity), while E593K shifted K1/2 to 3 µM (increased affinity), both in homomeric CNGA3 channels, indicating these mutations in the cyclic nucleotide-binding domain alter apparent cGMP affinity. Patch-clamp electrophysiology in HEK293 cells transfected with mutant CNGA3 Biochemical and biophysical research communications High 17693388
2008 Functional analysis of CNGA3 mutations R427C and R563C in HEK293 cells using patch-clamp showed profoundly reduced cGMP maximum currents in both homo- and heteromers with CNGB3. Treatment with the chemical chaperone glycerol increased macroscopic currents and surface expression as confirmed by immunocytochemistry, indicating impaired folding/trafficking as the primary pathogenic mechanism. R427C homomers also showed increased cGMP and cAMP sensitivities, partially compensated by CNGB3 co-expression. Patch-clamp electrophysiology; calcium imaging; immunocytochemistry in HEK293 cells The European journal of neuroscience High 18445228
2008 Functional characterization of CNGA3 mutations in HEK293 cells showed that several mutations (R283Q, T291R, F547L, G557R, E590K, E228K, R439W, A469T) alter apparent cGMP sensitivity of mutant channels. Some mutations' functional defects were compensated by co-expression with wild-type CNGB3. Multiple mutant channels exhibited severely impaired membrane targeting (trafficking defects) rather than intrinsic gating defects. Reduced cell culture temperature improved surface expression of folding/trafficking-defective mutants. Calcium imaging; patch-clamp electrophysiology; immunostaining/colocalization in HEK293 cells Human mutation High 18521937
2008 Native cone CNG channel in the cone-dominant Nrl-/- mouse retina is a heterotetrameric complex composed of both CNGA3 and CNGB3 subunits. Co-immunoprecipitation demonstrated direct interaction between CNGA3 and CNGB3. Chemical cross-linking generated products consistent with dimeric to tetrameric channel complexes. No association between CNGA3 and the cone Na+/Ca2+-K+ exchanger NCKX2 was detected by co-immunoprecipitation. Co-immunoprecipitation; chemical cross-linking; western blotting; immunolabeling in Nrl-/- mouse retina Journal of neurochemistry High 18665891
2009 Loss of CNGB3 in mice leads to significant downregulation of CNGA3 protein and mRNA, identifying CNGB3 as a regulator of CNGA3 biosynthesis. This downregulation of CNGA3 is proposed as a pathogenic mechanism underlying cone dysfunction in CNGB3-deficient mice, with reduced cone ERG responses (~75% reduction) and cone density (~40% reduction). Photopic/scotopic ERG; western blotting; RT-PCR; immunohistochemistry in CNGB3-/- mice Human molecular genetics High 19767295
2010 Disease-causing C-terminal mutations R377W and F488L in CNGA3 cause loss of functional channel activity and apparent cytosolic aggregation of the protein. Circular dichroism analysis of the purified C-terminal domain showed that while the mutant proteins retain folded structures, their secondary structure differs from wild-type and, critically, the wild-type C-terminus undergoes a significant decrease in alpha-helical content in response to channel ligands (conformational change) that is abolished in both mutants. This indicates the mutations impair the active conformational change of the channel. Calcium imaging; patch-clamp electrophysiology; immunofluorescence; circular dichroism spectroscopy of purified GST-fusion proteins from E. coli Biochemistry High 20088482
2010 CNGA3 expression is restored by AAV-mediated gene delivery in CNGA3-/- mice, rescuing cone photoreceptor function as measured by ERG and normalizing cGMP levels in cones. Expression of CNGA3 also delayed cone cell death and reduced inflammatory response of Müller glia cells, demonstrating that the channel directly controls cGMP homeostasis in cones. AAV gene delivery; ERG; immunohistochemistry; cGMP measurement in CNGA3-/- mice Molecular therapy : the journal of the American Society of Gene Therapy High 20628362
2011 CNGA3 is expressed in inhibitory neurons of the dorsal horn of the spinal cord and is upregulated following hindpaw inflammation. CNGA3-/- mice exhibit increased nociceptive behavior specifically in inflammatory pain models, while acute and neuropathic pain behavior is normal. Furthermore, CNGA3-/- mice show exaggerated pain hypersensitivity after intrathecal cGMP analogs or NO donors, demonstrating that CNGA3 acts as an inhibitory modulator of spinal pain sensitization in the NO/cGMP signaling pathway. In situ hybridization; behavioral pain assays; intrathecal pharmacology in CNGA3-/- mice The Journal of neuroscience : the official journal of the Society for Neuroscience High 21813679
2012 CNGA3 deficiency leads to progressive loss of cone synaptic terminal neurochemical and ultrastructural integrity beginning at 1 month, followed by secondary rod impairment and degeneration (reduced scotopic ERG b-wave by 15% at 1 month, 40% by 9 months; reduced rod-specific proteins rhodopsin, rod transducin α, and GARP by 30-40%). This demonstrates that cone CNG channel function is required for maintenance of rod synaptic structure and viability. ERG; immunohistochemistry; electron microscopy; western blotting in CNGA3-/- mice Investigative ophthalmology & visual science High 22247469
2012 CNGA3 protein is expressed in stereocilia and subcuticular plate region of saccular hair cells. The cytoplasmic C-terminus of CNGA3 binds the C-terminus of EMILIN1 (elastin microfibril interface-located protein 1) in both vestibular hair cell model and rat organ of Corti, with Ca2+-dependent binding confirmed by surface plasmon resonance (Kd = 1.6×10-6 M for trout proteins, Kd = 2.7×10-7 M for organ of Corti proteins at 68 µM Ca2+). Pulldown assays indicated binding is attributable to EMILIN1's intracellular C-terminal sequence. Yeast two-hybrid; surface plasmon resonance; pulldown assays; immunolocalization The Biochemical journal Medium 22248097
2013 The achromatopsia-associated CNGA3 mutation L633P (in the C-terminal leucine zipper domain) dramatically potentiates phosphoinositide (PIP2/PIP3) inhibition of apparent cGMP affinity. This effect depends on an intact N-terminal PIPn regulation module. Co-immunoprecipitation of channel fragments and thermodynamic linkage analysis provided evidence that the L633P mutation alters intersubunit (not intrasubunit) coupling between N- and C-terminal regions, revealing that intersubunit interactions control cone CNG channel sensitivity to phosphoinositide regulation. Patch-clamp electrophysiology of excised patches; co-immunoprecipitation; thermodynamic linkage analysis; tandem dimer constructs in heterologous expression American journal of physiology. Cell physiology High 23552282
2013 The N-terminus of CNGA3 binds specifically to the C-terminus of stereocilia tip-link protein CDH23+68 (cadherin 23 with exon 68) in a Ca2+-dependent manner, as shown by yeast two-hybrid, pulldown assays, and surface plasmon resonance. Myosin VIIa competed with CDH23+68 for binding to the CNGA3 N-terminus. Yeast two-hybrid mating and co-transformation; pulldown assays; surface plasmon resonance The Journal of biological chemistry Medium 23329832
2014 The p.Cys319Arg variant in CNGA3 completely abolishes calcium influx when expressed alone or with wild-type CNGB3 in HEK293 cells. Western blotting and immunolocalization showed decreased channel density at the cell membrane, indicating that impaired folding and/or trafficking of the CNGA3 protein is the main pathogenic mechanism for this variant. Calcium influx assay; western blotting; immunolocalization in HEK293 cells European journal of human genetics : EJHG Medium 25052312
2015 In a canine CNGA3 model, R424W mutation causes complete loss of cone function and channel activity. Structural modeling and molecular dynamics simulations revealed that R424 forms a salt bridge with E306, and disruption of this interaction with R424W abolishes channel gating. A double mutant R424E-E306R that reverses the charges rescued cGMP-activated currents, confirming the functional importance of this salt bridge. The V644del mutation affects the C-terminal leucine zipper (CLZ) domain, destabilizing intersubunit coiled-coil interactions and preventing normal trimeric CNGA3 subunit assembly. In vitro electrophysiology; molecular dynamics simulations; structural modeling; in vivo ERG in dogs PloS one High 26407004
2018 An early nonsense mutation in CNGA3 induces use of a downstream alternative translation initiation site, producing a short CNGA3 isoform. This short isoform is functional (confirmed by calcium influx assay) but does not compensate for loss of the full-length isoform in achromatopsia patients. Western blot; DAB staining; calcium influx assay in HEK293 and 661W cells expressing CNGA3-GST fusion constructs Experimental eye research Medium 29499183
2018 Heterozygous loss of one CNGA3 allele (Cnga3+/-) exacerbates cone dystrophy in Cngb3R403Q/R403Q mice, demonstrating a digenic triallelic inheritance pattern. This genotype-phenotype correlation was validated in mouse models generated by crossbreeding Cnga3-/- with Cngb3R403Q/R403Q mice, establishing that CNGA3 dosage modulates disease severity when CNGB3 is partially dysfunctional. Generation of Cnga3+/- Cngb3R403Q/R403Q triallelic mouse model; ERG and phenotypic analysis; genetic analysis of human patient cohort The Journal of clinical investigation High 30418171
2020 The cGMP-dependent protein kinase 2 (Prkg2) is a key mediator of cone photoreceptor degeneration downstream of elevated cGMP accumulation in CNGA3-deficient cones. Virus-mediated knockdown or genetic ablation of Prkg2 in Cnga3 KO mice counteracted cone degeneration and preserved cone number. ER stress and unfolded protein response induction in Cnga3 KO cones also depends on Prkg2. AAV-mediated knockdown; genetic double-KO; cone counting; ER stress marker analysis in Cnga3-/- mice International journal of molecular sciences High 33374621
2010 CNGA3 is expressed in Grueneberg ganglion (GG) neurons that respond to cool ambient temperatures, and is restricted to the coolness-responsive cells. CNGA3-deficient mice show significantly reduced responses of GG neurons to cool temperatures, demonstrating that CNGA3 contributes to coolness-evoked responses likely via a cGMP transduction cascade. In situ hybridization; functional calcium imaging of GG neurons in CNGA3-/- mice Cellular and molecular life sciences : CMLS Medium 20165899
2004 Human CNGA3 produces tissue-specific alternatively spliced variants. Variant 1 (containing exon 5) is the predominant form exclusively in the retina. Variants 2 and 3 (lacking exon 5) are expressed in all other 23 human tissues tested, with Variant 2 being predominant outside the retina. This indicates retina-specific inclusion of exon 5 for the cone photoreceptor-specific isoform. RT-PCR; DNA sequencing across 23 human tissues Molecular vision Medium 15534583
2023 Systematic functional analysis of 20 CNGA3 splice site variants using pSPL3 exon-trapping minigene assays demonstrated that 10 variants at canonical and non-canonical splice sites induced aberrant splicing (intronic retention, exonic deletion, exon skipping), producing 21 different aberrant transcripts, 11 predicted to introduce premature termination codons. This enabled reclassification of variants previously classified as uncertain significance. pSPL3 exon-trapping minigene splice assays Scientific reports High 36801918
2010 R277C and R283W CNGA3 mutations in HEK293 cells cause loss of channel function and apparent cytosolic aggregation of the protein by immunofluorescence, indicating impaired cellular trafficking and plasma membrane targeting. Co-expression of mutant channels with wild-type CNGA3 did not affect wild-type channel activity, suggesting no dominant-negative effect. Calcium imaging; patch-clamp electrophysiology; immunofluorescence in HEK293 cells Advances in experimental medicine and biology Medium 20238023
2025 CNGA3 is required for the morphological complexity of human basal radial glia (bRG) in the developing neocortex. Functional analysis in human cerebral organoids showed that CNGA3 is necessary for bRG morphology, implicating it in a morphoregulatory role outside of photoreceptors. Functional analysis in human cerebral organoids; comparative chromatin/transcriptional profiling across primate organoids bioRxivpreprint Low

Source papers

Stage 0 corpus · 75 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2001 CNGA3 mutations in hereditary cone photoreceptor disorders. American journal of human genetics 254 11536077
1999 Selective loss of cone function in mice lacking the cyclic nucleotide-gated channel CNG3. Proceedings of the National Academy of Sciences of the United States of America 239 10377453
2010 Restoration of cone vision in the CNGA3-/- mouse model of congenital complete lack of cone photoreceptor function. Molecular therapy : the journal of the American Society of Gene Therapy 162 20628362
2005 Impaired opsin targeting and cone photoreceptor migration in the retina of mice lacking the cyclic nucleotide-gated channel CNGA3. Investigative ophthalmology & visual science 112 15790924
2012 AAV-mediated cone rescue in a naturally occurring mouse model of CNGA3-achromatopsia. PloS one 103 22509403
2015 Gene Augmentation Therapy Restores Retinal Function and Visual Behavior in a Sheep Model of CNGA3 Achromatopsia. Molecular therapy : the journal of the American Society of Gene Therapy 99 26087757
2006 Synaptic plasticity in CNGA3(-/-) mice: cone bipolar cells react on the missing cone input and form ectopic synapses with rods. The Journal of neuroscience : the official journal of the Society for Neuroscience 99 16687517
2004 Morphological characterization of the retina of the CNGA3(-/-)Rho(-/-) mutant mouse lacking functional cones and rods. Investigative ophthalmology & visual science 73 15161873
2009 Impaired cone function and cone degeneration resulting from CNGB3 deficiency: down-regulation of CNGA3 biosynthesis as a potential mechanism. Human molecular genetics 65 19767295
2015 Genetics and Disease Expression in the CNGA3 Form of Achromatopsia: Steps on the Path to Gene Therapy. Ophthalmology 63 25616768
2010 Comprehensive analysis of the achromatopsia genes CNGA3 and CNGB3 in progressive cone dystrophy. Ophthalmology 59 20079539
2008 Mutations in CNGA3 impair trafficking or function of cone cyclic nucleotide-gated channels, resulting in achromatopsia. Human mutation 55 18521937
2011 Whole-exome sequencing identifies ALMS1, IQCB1, CNGA3, and MYO7A mutations in patients with Leber congenital amaurosis. Human mutation 53 21901789
2021 Three-year results of phase I retinal gene therapy trial for CNGA3-mutated achromatopsia: results of a non randomised controlled trial. The British journal of ophthalmology 52 34006508
2005 Functional consequences of progressive cone dystrophy-associated mutations in the human cone photoreceptor cyclic nucleotide-gated channel CNGA3 subunit. American journal of physiology. Cell physiology 47 15743887
2017 The Clinical Phenotype of CNGA3-Related Achromatopsia: Pretreatment Characterization in Preparation of a Gene Replacement Therapy Trial. Investigative ophthalmology & visual science 44 28159970
2009 A mutation in gene CNGA3 is associated with day blindness in sheep. Genomics 40 19874885
2011 CNGA3: a target of spinal nitric oxide/cGMP signaling and modulator of inflammatory pain hypersensitivity. The Journal of neuroscience : the official journal of the Society for Neuroscience 37 21813679
2008 Native cone photoreceptor cyclic nucleotide-gated channel is a heterotetrameric complex comprising both CNGA3 and CNGB3: a study using the cone-dominant retina of Nrl-/- mice. Journal of neurochemistry 34 18665891
2004 A new putative cyclic nucleotide-gated channel gene, cng-3, is critical for thermotolerance in Caenorhabditis elegans. Biochemical and biophysical research communications 33 15530424
2018 Accessory heterozygous mutations in cone photoreceptor CNGA3 exacerbate CNG channel-associated retinopathy. The Journal of clinical investigation 32 30418171
2005 Transmembrane S1 mutations in CNGA3 from achromatopsia 2 patients cause loss of function and impaired cellular trafficking of the cone CNG channel. Investigative ophthalmology & visual science 32 15980212
2017 Safety and Efficacy Evaluation of rAAV2tYF-PR1.7-hCNGA3 Vector Delivered by Subretinal Injection in CNGA3 Mutant Achromatopsia Sheep. Human gene therapy. Clinical development 31 28478700
2014 Identification of CNGA3 mutations in 46 families: common cause of achromatopsia and cone-rod dystrophies in Chinese patients. JAMA ophthalmology 31 24903488
2008 Functional analysis of human CNGA3 mutations associated with colour blindness suggests impaired surface expression of channel mutants A3(R427C) and A3(R563C). The European journal of neuroscience 31 18445228
2017 Development of a Chromatic Pupillography Protocol for the First Gene Therapy Trial in Patients With CNGA3-Linked Achromatopsia. Investigative ophthalmology & visual science 29 28241315
2007 Functional analysis of rod monochromacy-associated missense mutations in the CNGA3 subunit of the cone photoreceptor cGMP-gated channel. Biochemical and biophysical research communications 28 17693388
2014 Homozygous missense variant in the human CNGA3 channel causes cone-rod dystrophy. European journal of human genetics : EJHG 27 25052312
2006 Compound heterozygous CNGA3 mutations (R436W, L633P) in a Japanese patient with congenital achromatopsia. Visual neuroscience 26 16961972
2018 Six Years and Counting: Restoration of Photopic Retinal Function and Visual Behavior Following Gene Augmentation Therapy in a Sheep Model of CNGA3 Achromatopsia. Human gene therapy 25 29926749
2017 Gene Augmentation Therapy for a Missense Substitution in the cGMP-Binding Domain of Ovine CNGA3 Gene Restores Vision in Day-Blind Sheep. Investigative ophthalmology & visual science 25 28282490
2012 CNGA3 deficiency affects cone synaptic terminal structure and function and leads to secondary rod dysfunction and degeneration. Investigative ophthalmology & visual science 25 22247469
2010 The cyclic nucleotide-gated ion channel CNGA3 contributes to coolness-induced responses of Grueneberg ganglion neurons. Cellular and molecular life sciences : CMLS 25 20165899
2015 Vitreal delivery of AAV vectored Cnga3 restores cone function in CNGA3-/-/Nrl-/- mice, an all-cone model of CNGA3 achromatopsia. Human molecular genetics 24 25855802
2015 Canine CNGA3 Gene Mutations Provide Novel Insights into Human Achromatopsia-Associated Channelopathies and Treatment. PloS one 22 26407004
2018 Development of Methodology and Study Protocol: Safety and Efficacy of a Single Subretinal Injection of rAAV.hCNGA3 in Patients with CNGA3-Linked Achromatopsia Investigated in an Exploratory Dose-Escalation Trial. Human gene therapy. Clinical development 20 30187779
2014 Flicker cone function in normal and day blind sheep: a large animal model for human achromatopsia caused by CNGA3 mutation. Documenta ophthalmologica. Advances in ophthalmology 20 25204753
2015 Novel CNGA3 mutations in Chinese patients with achromatopsia. The British journal of ophthalmology 19 25637600
2012 CNGA3 is expressed in inner ear hair cells and binds to an intracellular C-terminus domain of EMILIN1. The Biochemical journal 19 22248097
2010 Novel CNGA3 and CNGB3 mutations in two Pakistani families with achromatopsia. Molecular vision 18 20454696
2008 CNGA3 mutations in two United Arab Emirates families with achromatopsia. Molecular vision 18 18636117
2017 Contribution of the cyclic nucleotide gated channel subunit, CNG-3, to olfactory plasticity in Caenorhabditis elegans. Scientific reports 17 28279024
2017 Long-term retinal cone rescue using a capsid mutant AAV8 vector in a mouse model of CNGA3-achromatopsia. PloS one 17 29131863
2013 CNGA3 achromatopsia-associated mutation potentiates the phosphoinositide sensitivity of cone photoreceptor CNG channels by altering intersubunit interactions. American journal of physiology. Cell physiology 17 23552282
2022 Comprehensive variant spectrum of the CNGA3 gene in patients affected by achromatopsia. Human mutation 16 35332618
2013 Cyclic nucleotide-gated channel α-3 (CNGA3) interacts with stereocilia tip-link cadherin 23 + exon 68 or alternatively with myosin VIIa, two proteins required for hair cell mechanotransduction. The Journal of biological chemistry 16 23329832
2011 Genetic analysis of four Pakistani families with achromatopsia and a novel S4 motif mutation of CNGA3. Japanese journal of ophthalmology 16 21912902
2010 The disease-causing mutations in the carboxyl terminus of the cone cyclic nucleotide-gated channel CNGA3 subunit alter the local secondary structure and interfere with the channel active conformational change. Biochemistry 16 20088482
2011 Oligocone trichromacy is part of the spectrum of CNGA3-related cone system disorders. Ophthalmic genetics 15 21268679
2011 Identification of variants in CNGA3 as cause for achromatopsia by exome sequencing of a single patient. Archives of ophthalmology (Chicago, Ill. : 1960) 15 21911670
2018 Diseases associated with mutations in CNGA3: Genotype-phenotype correlation and diagnostic guideline. Progress in molecular biology and translational science 14 30711023
2021 Outer retinal transduction by AAV2-7m8 following intravitreal injection in a sheep model of CNGA3 achromatopsia. Gene therapy 13 34853444
2020 The cGMP-Dependent Protein Kinase 2 Contributes to Cone Photoreceptor Degeneration in the Cnga3-Deficient Mouse Model of Achromatopsia. International journal of molecular sciences 11 33374621
2004 [Molecular genetic findings in patients with congenital cone dysfunction. Mutations in the CNGA3, CNGB3, or GNAT2 genes]. Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft 11 15459792
2021 Disease Progression in CNGA3 and CNGB3 Retinopathy; Characteristics of Slovenian Cohort and Proposed OCT Staging Based on Pooled Data from 126 Patients from 7 Studies. Current issues in molecular biology 10 34449556
2020 Intraobserver Repeatability and Interobserver Reproducibility of Foveal Cone Density Measurements in CNGA3- and CNGB3-Associated Achromatopsia. Translational vision science & technology 9 32832242
2018 An early nonsense mutation facilitates the expression of a short isoform of CNGA3 by alternative translation initiation. Experimental eye research 8 29499183
2010 Molecular pathogenesis of achromatopsia associated with mutations in the cone cyclic nucleotide-gated channel CNGA3 subunit. Advances in experimental medicine and biology 8 20238023
2004 Tissue specific expression of alternative splice forms of human cyclic nucleotide gated channel subunit CNGA3. Molecular vision 8 15534583
2023 Systematic analysis of CNGA3 splice variants identifies different mechanisms of aberrant splicing. Scientific reports 7 36801918
2019 Identification of Novel Mutation in CNGA3 gene by Whole-Exome Sequencing and In-Silico Analyses for Genotype-Phenotype Assessment with Autosomal Recessive Achromatopsia in Pakistani families. JPMA. The Journal of the Pakistan Medical Association 6 30804581
2015 Achromatopsia caused by novel missense mutations in the CNGA3 gene. International journal of ophthalmology 6 26558200
2021 Paternal Uniparental Isodisomy of Chromosome 2 in a Patient with CNGA3-Associated Autosomal Recessive Achromatopsia. International journal of molecular sciences 5 34360608
2012 [A novel mutation in the CNGA3 gene responsible for incomplete achromatopsia]. Archivos de la Sociedad Espanola de Oftalmologia 5 24269407
2023 Molecular and Clinical Characterization of CNGA3 and CNGB3 Genes in Brazilian Patients Affected with Achromatopsia. Genes 4 37372476
2024 Longitudinal Imaging of the Foveal Cone Mosaic in CNGA3-Associated Achromatopsia. Investigative ophthalmology & visual science 3 39365261
2023 Functional evaluation allows ACMG/AMP-based re-classification of CNGA3 variants associated with achromatopsia. Genetics in medicine : official journal of the American College of Medical Genetics 3 37689994
2004 Modulation of renal CNG-A3 sodium channel in rats subjected to low- and high-sodium diets. Biochimica et biophysica acta 2 15471576
2025 Clinical and genetic features of CNGA3 achromatopsia in preschool children: novel insights into retinal architecture and therapeutic window for clinical trials. Frontiers in medicine 1 40241905
2020 Molecular and clinical characterization of Thai patients with achromatopsia: identification of three novel disease-associated variants in the CNGA3 and CNGB3 genes. International ophthalmology 1 32869108
2025 Structure-function analysis of CNGA3-associated achromatopsia patient variants complements clinical genomics in pathogenicity determination. Orphanet journal of rare diseases 0 40448196
2025 Novel compound heterozygous CNGA3 mutation associated with retinal cone dystrophy. Experimental and therapeutic medicine 0 40529388
2025 Whole exome sequencing reveals pathogenic variants in CNGA3, CACNA1F, and RPGRIP1 in consanguineous Pakistani families with diverse retinal phenotypes. PloS one 0 40737315
2024 [Genetic analysis of a Chinese pedigree affected with Achromatopsia due to variants of CNGA3 gene and a literature review]. Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics 0 39217486
2024 Case Report: Novel CNGA3 compound heterozygous variants cause achromatopsia in three patients from a family. Frontiers in genetics 0 39678380

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