Is CHD2 p.Gly275= (c.825A>T) pathogenic?

CHD2 p.Gly275= (c.825A>T) is classified Conflicting classifications of pathogenicity in CHD2 (ClinVar, Conflicting submitters, 2 submitters; last evaluated 2023-07-19). Very rare (popmax 0.00551%, nfe); Associated with developmental and epileptic encephalopathy 94.

What condition is associated with CHD2 p.Gly275= (c.825A>T)?

CHD2 p.Gly275= (c.825A>T) is associated with developmental and epileptic encephalopathy 94 (ClinVar).

How common is CHD2 p.Gly275= (c.825A>T) in the general population?

CHD2 p.Gly275= (c.825A>T) is very rare (popmax 0.00551%, nfe) (gnomAD).

How is Lennox-Gastaut syndrome inherited?

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

CHD2 p.Gly275=

c.825A>T · rs372257500 · VCV514492

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00551%, nfe)

Conditions

developmental and epileptic encephalopathy 94

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Splicing
SpliceAI	Δ0.91	donor gain · deltas
Pangolin	Δ0.50	gain · loss 0.10 · agrees with SpliceAI · independent
Constraint at this position
Conservation	phyloP 9	GERP 2.8, phastCons 1
Overall
CADD	20.7	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00551% European (non-Finnish) · 65/1,179,062 alleles

Filtering AF 0.00443% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00404%

Overall 0.00416% 67/1,611,358 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00551%	18,139
Remaining individualsnot grpmax-eligible	0.0016%	62,348
African / African-American	0.00134%	74,806

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: CHD2
Protein: p.Gly275=
Coding: c.825A>T
MANE Select: NM_001271
dbSNP: rs372257500
Type: single nucleotide variant
Location: chr15:92941954 (GRCh38)
Gene constraint: LOEUF 0.174 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 60.81
Residue 275: the chromo 1 domain; 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 p.Gly275Glu Uncertain significance ★ ⚠ same residue
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

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-gly275 (accessed [today's date]).

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