Is CDKL5 p.Asp135Val (c.404A>T) pathogenic?

CDKL5 p.Asp135Val (c.404A>T) is classified Uncertain significance in CDKL5 (ClinVar, Multiple submitters, 3 submitters; last evaluated 2023-05-23). AlphaMissense: likely pathogenic (1); Absent from gnomAD v4.1; Associated with Angelman syndrome-like.

What condition is associated with CDKL5 p.Asp135Val (c.404A>T)?

CDKL5 p.Asp135Val (c.404A>T) is associated with Angelman syndrome-like, developmental and epileptic encephalopathy, 2 (ClinVar).

How common is CDKL5 p.Asp135Val (c.404A>T) in the general population?

CDKL5 p.Asp135Val (c.404A>T) is absent from gnomAD v4.1 (gnomAD).

What do computational predictors say about CDKL5 p.Asp135Val (c.404A>T)?

AlphaMissense predicts likely pathogenic (score 1) — an in-silico prediction, not a clinical call.

CDKL5 p.Asp135Val

c.404A>T · rs1569214316 · VCV593574

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 3 submitters

AlphaMissense

likely pathogenic

1 · ACMG-weighted

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,181,231)

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Angelman syndrome-like

Computational evidence

Protein change
AlphaMissense	1	likely pathogenic · top 4% in CDKL5
REVEL	0.831	moderately pathogenic-leaning
SaProt	LLR -17.12	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Pangolin	Δ0.29	loss · gain 0.01 · not in the SpliceAI release · independent
Constraint at this position
Conservation	phyloP 11	GERP 2.5, phastCons 1
Regional constraint	o/e 0.35	constrained · MANE · 91 kb · p 1.2e-21 · regional, not allelic
Overall
CADD	29.7	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean damaging — a triage signal, not a reclassification

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

No allele count reported in gnomAD v4.1 (AN 1,181,231). This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: CDKL5
Protein: p.Asp135Val
Coding: c.404A>T
MANE Select: NM_001323289
dbSNP: rs1569214316
Type: single nucleotide variant
Location: chrX:18581891 (GRCh38)
Structure: AlphaFold pLDDT 53.76 · 3 PDB
Residue 135: the protein kinase domain; an active site

Full CDKL5 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Angelman syndrome-like — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: developmental and epileptic encephalopathy, 2

Similar variants

CDKL5 p.Asp135His Likely pathogenic ★ same residue
RS1 p.Gly135Glu Pathogenic ★ same residue
CDKL5 p.Asp135Glu Uncertain significance ★ same residue
CDKL5 p.Asp135Gly Uncertain significance ★ ⚠ same residue
RS1 p.Gly135Ala Conflicting classifications of pathogenicity ★ ⚠ same residue
RS1 p.Gly135Arg Uncertain significance ★ ⚠ same residue
CDKL5 p.Asp135= Likely benign ★ same residue
CDKL5 c.146-1G>A 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-asp135val (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown