Is CHD2 p.Pro1288Ser (c.3862C>T) pathogenic?

CHD2 p.Pro1288Ser (c.3862C>T) is classified Uncertain significance in CHD2 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-05-13). AlphaMissense: likely benign (0.1656); Absent from gnomAD v4.1; Associated with developmental and epileptic encephalopathy 94.

What condition is associated with CHD2 p.Pro1288Ser (c.3862C>T)?

CHD2 p.Pro1288Ser (c.3862C>T) is associated with developmental and epileptic encephalopathy 94 (ClinVar).

How common is CHD2 p.Pro1288Ser (c.3862C>T) in the general population?

CHD2 p.Pro1288Ser (c.3862C>T) is absent from gnomAD v4.1 (gnomAD).

How is Lennox-Gastaut syndrome inherited?

Typically Autosomal dominant, Multigenic/multifactorial (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about CHD2 p.Pro1288Ser (c.3862C>T)?

AlphaMissense predicts likely benign (score 0.1656) — an in-silico prediction, not a clinical call.

CHD2 p.Pro1288Ser

c.3862C>T · rs2054201108 · VCV836111

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.1656 · ACMG-weighted

gnomAD v4.1

Not reported

no allele count reported in gnomAD v4.1 (AN 1,595,366)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

developmental and epileptic encephalopathy 94

Computational evidence

Protein change
AlphaMissense	0.1656	likely benign
REVEL	0.491	indeterminate
SaProt	LLR -8.70	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.7	GERP 1.7, phastCons 1
Regional constraint	o/e 0.56	unconstrained · MANE · 5,656 bp · p 4.7e-09 · regional, not allelic
Overall
CADD	23.5	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — 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 1,595,366). 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: CHD2
Protein: p.Pro1288Ser
Coding: c.3862C>T
MANE Select: NM_001271
dbSNP: rs2054201108
Type: single nucleotide variant
Location: chr15:92997380 (GRCh38)
Gene constraint: LOEUF 0.174 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 60.81
Residue 1288: a UniProt-annotated variant site (in dee94); a UniProt-annotated variant site (found in a patient with progressive myoclonus epilepsy; uncertain significance)

Full CHD2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

developmental and epileptic encephalopathy 94 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Lennox-Gastaut syndrome (Orphanet):

Inheritance: Autosomal dominant, Multigenic/multifactorial, Not applicable
Onset: Childhood, Infancy
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

CHD2 c.1153+1G>C Pathogenic ★★ same condition
CHD2 c.1809+1G>A Pathogenic/Likely pathogenic ★★ same condition
CHD2 c.294+1G>T Likely pathogenic ★★ same condition
CHD2 c.443+1G>A Pathogenic/Likely pathogenic ★★ same condition
CHD2 c.693-1G>A Likely pathogenic ★★ same condition
CHD2 p.Ala879Val Pathogenic/Likely pathogenic ★★ ⚠ same condition
CHD2 p.Arg1072Ter Pathogenic ★★ same condition
CHD2 p.Arg1137Ter Pathogenic/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/chd2-p-pro1288ser (accessed [today's date]).

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