CDKL5 p.Ser426=
c.1278A>C · rs267608620 · VCV143773
Benign/Likely benign
Multiple submitters
Classification
Benign/Likely benign
ClinVar
Review
Multiple submitters ★★☆☆
ClinVar · 4 submitters
gnomAD v4.1
Rare
very rare (popmax 0.00615%, nfe)
Conditions
2
CDKL5 disorder
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| Splicing | ||
| SpliceAI | — | not assessed · no allele here is in the release |
|---|---|---|
| Constraint at this position | ||
| Conservation | phyloP -4.3 | GERP -4.8 |
| Overall | ||
| CADD | 0.368 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.00615%
European (non-Finnish) · 55/894,806 alleles
Filtering AF
0.00483%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.00434%
Overall
0.00463%
56/1,209,696 alleles · very rare
| Ancestry group | Frequency | 1 in |
|---|---|---|
| European (non-Finnish)grpmax | 0.00615% | 16,269 |
| Remaining individualsnot grpmax-eligible | 0.0021% | 47,586 |
Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.
Variant & gene context
- Gene
- CDKL5
- Protein
- p.Ser426=
- Coding
- c.1278A>C
- MANE Select
- NM_001323289
- dbSNP
- rs267608620
- Type
- single nucleotide variant
- Location
- chrX:18604202 (GRCh38)
- Structure
- AlphaFold pLDDT 53.76 · 3 PDB
- Residue 426
- the 'disordered' region
Similar variants
- CDKL5 c.146-1G>A Pathogenic ★★★ same condition
- CDKL5 p.Ala157Pro Likely pathogenic ★★★ same condition
- CDKL5 p.Ala157Val Likely pathogenic ★★★ same condition
- CDKL5 p.Ala40Val Pathogenic ★★★ same condition
- CDKL5 p.Arg178Gln Pathogenic ★★★ same condition
- CDKL5 p.Arg717= Likely pathogenic ★★★ same condition
- CDKL5 p.Arg948Ter Pathogenic ★★★ same condition
- CDKL5 p.Asn71Asp Likely pathogenic ★★★ ⚠ same condition
Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →
Cite Sugi Variant
Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/cdkl5-p-ser426 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown