Is EP300 p.Ala922= (c.2766G>A) pathogenic?

EP300 p.Ala922= (c.2766G>A) is classified Likely benign in EP300 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-05-19). Very rare (popmax 0.00703%, nfe); Associated with Rubinstein-Taybi syndrome due to EP300 haploinsufficiency.

What condition is associated with EP300 p.Ala922= (c.2766G>A)?

EP300 p.Ala922= (c.2766G>A) is associated with Rubinstein-Taybi syndrome due to EP300 haploinsufficiency (ClinVar).

How common is EP300 p.Ala922= (c.2766G>A) in the general population?

EP300 p.Ala922= (c.2766G>A) is very rare (popmax 0.00703%, nfe) (gnomAD).

EP300 p.Ala922=

c.2766G>A · rs370810144 · VCV1206737

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00703%, nfe)

Conditions

Rubinstein-Taybi syndrome due to EP300 haploinsufficiency

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 -6.5	GERP -5
Overall
CADD	1.59	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00703% European (non-Finnish) · 83/1,179,874 alleles

Filtering AF 0.00579% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00533%

Overall 0.00558% 90/1,611,896 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00703%	14,215
Remaining individualsnot grpmax-eligible	0.0048%	20,819
East Asian	0.00446%	22,443
Ashkenazi Jewishnot grpmax-eligible	0.00338%	29,602
South Asian	0.0011%	91,058

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: EP300
Protein: p.Ala922=
Coding: c.2766G>A
MANE Select: NM_001429
dbSNP: rs370810144
Type: single nucleotide variant
Location: chr22:41150147 (GRCh38)
Gene constraint: LOEUF 0.164 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 54.88 · 60 PDB
Residue 922: the 'disordered' region

Full EP300 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Rubinstein-Taybi syndrome due to EP300 haploinsufficiency — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Similar variants

EP300 p.Ala922Val Likely benign ★ same residue
EP300 c.1282+1G>A Pathogenic/Likely pathogenic ★★ same condition
EP300 c.3671+1G>A Pathogenic/Likely pathogenic ★★ same condition
EP300 c.3729-2A>G Pathogenic/Likely pathogenic ★★ same condition
EP300 c.3857A>G Pathogenic/Likely pathogenic ★★ ⚠ same condition
EP300 p.Arg1055Ter Pathogenic ★★ same condition
EP300 p.Arg1312Ter Pathogenic ★★ same condition
EP300 p.Arg1356Ter 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/ep300-p-ala922 (accessed [today's date]).

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