Loop-region mutations in CSNK2A1 are associated with higher symptom burden in OCNDS
In 48 individuals with OCNDS, variants in loop regions of CK2α were associated with significantly younger age at diagnosis and higher frequency of hypotonia. Mutations in the glycine-rich loop were linked to significantly higher symptom burden and more non-seizure neurological symptoms.
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Loop-region mutations in CSNK2A1 are associated with higher symptom burden in OCNDS The current body of evidence comprises 1 study. EvidenceHub rates the overall confidence at 32/100 (low).
The Claim
Loop-region mutations in CSNK2A1 are associated with higher symptom burden in OCNDS
This conclusion is most relevant to: 48 individuals with pathogenic or likely pathogenic CSNK2A1 missense variants enrolled in Simons Searchlight.
What the Research Shows
The conclusion draws on 1 linked study. Highlights from the cited literature:
- ▸OCNDS core features are conserved across variants, with loop-region mutations driving greater symptom burden. (Frontiers in human neuroscience, 2026) —
How It Works
The proposed biological pathway:
- ▸Mutations in loop regions (e.g., glycine-rich loop) disrupt ATP binding and regulatory CK2β subunit interaction
- ▸Disrupted CK2α function alters downstream signaling pathways
- ▸Increased functional impairment leads to greater symptom burden
- ▸Result: Higher symptom burden and earlier diagnosis in loop-region variants
Who Might Benefit
Evidence fit by population:
- ▸48 individuals with pathogenic or likely pathogenic CSNK2A1 missense variants enrolled in Simons Searchlight
Recommended Dose
N/A
Limitations & Caveats
Important context when interpreting this evidence:
- ▸Small sample size (n=48) limits generalizability
- ▸Reliance on caregiver-reported surveys may introduce bias
- ▸No functional assays performed to confirm mechanistic links
Frequently Asked Questions
What is OCNDS?▼
Okur-Chung Neurodevelopmental Syndrome is an ultra-rare genetic disorder caused by mutations in the CSNK2A1 gene, characterized by developmental delay, intellectual disability, and speech deficits.
Which mutations cause more severe symptoms?▼
Mutations in loop regions, particularly the glycine-rich loop, are associated with higher symptom burden and earlier diagnosis.
Are sleep issues affected by mutation location?▼
No significant differences were observed between variant locations for sleep issues, intellectual disability, or speech delay.
How many patients were studied?▼
The study analyzed natural history data from 48 individuals with pathogenic CSNK2A1 missense variants.
References
- 1.Bagatelas ED, Khan MM, Rushing GV. “OCNDS core features are conserved across variants, with loop-region mutations driving greater symptom burden..” Frontiers in human neuroscience, 2026. PMID: 40677894 DOI: 10.3389/fnhum.2025.1589897