Is CHD2 p.Pro405= (c.1215G>A) pathogenic?

CHD2 p.Pro405= (c.1215G>A) is classified Likely benign in CHD2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-12-28). Ultra-rare (popmax 0.0337%, eas); Associated with developmental and epileptic encephalopathy 94.

What condition is associated with CHD2 p.Pro405= (c.1215G>A)?

CHD2 p.Pro405= (c.1215G>A) is associated with developmental and epileptic encephalopathy 94 (ClinVar).

How common is CHD2 p.Pro405= (c.1215G>A) in the general population?

CHD2 p.Pro405= (c.1215G>A) is ultra-rare (popmax 0.0337%, eas) (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.Pro405=

c.1215G>A · rs144294063 · VCV474373

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

ultra-rare (popmax 0.0337%, eas)

Conditions

developmental and epileptic encephalopathy 94

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 -8.2	GERP -5.6
Overall
CADD	3.695	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0337% East Asian · 15/44,570 alleles

Filtering AF 0.0207% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0167%

Overall 0.00252% 40/1,584,522 alleles · ultra-rare

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0337%	2,971
South Asian	0.0116%	8,625
Admixed American	0.00537%	18,620
Remaining individualsnot grpmax-eligible	0.00164%	61,124
European (non-Finnish)	0.000945%	105,852

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.Pro405=
Coding: c.1215G>A
MANE Select: NM_001271
dbSNP: rs144294063
Type: single nucleotide variant
Location: chr15:92946054 (GRCh38)
Gene constraint: LOEUF 0.174 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 60.81
Residue 405: the chromo 2 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.Pro405Leu Benign/Likely benign ★★ same residue
CHD2 p.Pro405Ala 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

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-pro405 (accessed [today's date]).

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