Affinage

ANKRD33

Photoreceptor ankyrin repeat protein · UniProt Q7Z3H0

Length
452 aa
Mass
49.4 kDa
Annotated
2026-06-09
9 papers in source corpus 2 papers cited in narrative 2 extracted findings
Cross-family judge vs UniProt: Affinage preferred faithfulness: 3/3 claims corpus-supported (100%)

Mechanistic narrative

Synthesis pass · prose summary of the discoveries below

ANKRD33 (PANKY) is a photoreceptor-specific ankyrin repeat protein that acts as a transcriptional cofactor in the retinal gene regulatory network (PMID:20026326). Its expression is directly induced by the CRX homeodomain transcription factor, and ANKRD33 in turn suppresses CRX-activated photoreceptor genes by inhibiting CRX DNA-binding activity, as demonstrated by electrophoretic mobility shift assay, thereby forming a negative-feedback loop on CRX-driven transcription (PMID:20026326). The PANKY-A isoform localizes to both the nucleus and the cytoplasm, consistent with a role bridging transcriptional regulation and a cytoplasmic function (PMID:20026326). Beyond this CRX feedback role, the mechanistic detail of ANKRD33 has not been characterized in the available corpus.

Mechanistic history

Synthesis pass · year-by-year structured walk · 2 steps
  1. 2009 Medium

    Established that ANKRD33/PANKY is not merely a photoreceptor marker but an active transcriptional regulator embedded in the CRX network, answering whether it has a function in photoreceptor gene control.

    Evidence Subcellular localization microscopy, transactivation reporter assays, and EMSA in a photoreceptor expression context

    PMID:20026326

    Open questions at the time
    • Mechanism by which ANKRD33 inhibits CRX DNA-binding (direct interaction vs. competition) not resolved
    • Functional significance of dual nuclear/cytoplasmic localization not defined
    • No in vivo loss-of-function phenotype reported
  2. 2012 Low

    Placed Ankrd33 downstream of the bHLH factor NeuroD1, linking its expression to a second photoreceptor transcriptional input and localizing the protein to outer segments.

    Evidence Microarray of NeuroD1 conditional (Cre/loxP) knockout retinas plus protein localization by expression pattern

    PMID:22784109

    Open questions at the time
    • Single-lab microarray correlation without direct functional follow-up of ANKRD33
    • Whether NeuroD1 regulation is direct or indirect not established
    • Functional role of outer-segment localization not addressed

Open questions

Synthesis pass · forward-looking unresolved questions
  • How ANKRD33 mechanistically suppresses CRX activity and what role it plays in photoreceptor physiology in vivo remain unresolved.
  • No structural basis for CRX inhibition
  • No knockout phenotype for ANKRD33 itself
  • Cytoplasmic/outer-segment function uncharacterized

Mechanism profile

Synthesis pass · controlled-vocabulary classification · explore literature graph →
Molecular activity
GO:0140110 transcription regulator activity 1
Localization
GO:0005634 nucleus 1 GO:0005829 cytosol 1
Partners
CRX

Evidence

Reading pass · 2 per-paper findings extracted from the source corpus
Year Finding Method Journal Conf PMIDs
2009 PANKY/ANKRD33 is a photoreceptor-specific ankyrin repeat protein that acts as a transcriptional cofactor suppressing CRX-activated photoreceptor genes; PANKY-A localizes to both nucleus and cytoplasm, its expression is directly upregulated by the CRX transcription factor, and it inhibits the DNA-binding activity of CRX as shown by electrophoretic mobility shift assay. Subcellular localization (microscopy), transactivation reporter assay, electrophoretic mobility shift assay (EMSA), expression/promoter analysis FEBS letters Medium 20026326
2012 Ankrd33 expression in retinal photoreceptors is downstream of NeuroD1 transcription factor; Ankrd33 mRNA is significantly down-regulated in NeuroD1 conditional knockout retinas, and the ANKRD33 protein product is selectively expressed in photoreceptor outer segments. Microarray analysis of NeuroD1 conditional knockout retinas (Cre/loxP); protein localization by selective expression pattern Journal of neurochemistry Low 22784109

Source papers

Stage 0 corpus · 9 papers · ranked by NIH iCite citations
Year Title Journal Citations PMID
2012 NeuroD1 is required for survival of photoreceptors but not pinealocytes: results from targeted gene deletion studies. Journal of neurochemistry 30 22784109
2021 Multi-ancestry genome-wide gene-sleep interactions identify novel loci for blood pressure. Molecular psychiatry 21 33859359
2018 A genome-wide association study of energy intake and expenditure. PloS one 19 30071075
2009 Panky, a novel photoreceptor-specific ankyrin repeat protein, is a transcriptional cofactor that suppresses CRX-regulated photoreceptor genes. FEBS letters 16 20026326
2019 Novel eye genes systematically discovered through an integrated analysis of mouse transcriptomes and phenome. Computational and structural biotechnology journal 14 31934309
2024 Genome-wide DNA methylation analysis related to ALS patient progression and survival. Journal of neurology 12 38372747
2008 Characterization of five novel large deletions causing hereditary haemorrhagic telangiectasia. Clinical genetics 8 18312453
2023 Excessive Gestational Weight Gain Alters DNA Methylation and Influences Foetal and Neonatal Body Composition. Epigenomes 4 37606455
2023 The Underlying Mechanism Involved in Gefitinib Resistance and Corresponding Experiment Validation in Lung Cancer. Mediators of inflammation 3 37205010

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