Is EP300 p.Pro2176Ser (c.6526C>T) pathogenic?

EP300 p.Pro2176Ser (c.6526C>T) is classified Conflicting classifications of pathogenicity in EP300 (ClinVar, Conflicting submitters, 3 submitters; last evaluated 2025-01-06). AlphaMissense: likely benign (0.0939); Very rare (popmax 0.00254%, nfe); Associated with Rubinstein-Taybi syndrome due to EP300 haploinsufficiency.

What condition is associated with EP300 p.Pro2176Ser (c.6526C>T)?

EP300 p.Pro2176Ser (c.6526C>T) is associated with Rubinstein-Taybi syndrome due to EP300 haploinsufficiency (ClinVar).

How common is EP300 p.Pro2176Ser (c.6526C>T) in the general population?

EP300 p.Pro2176Ser (c.6526C>T) is very rare (popmax 0.00254%, nfe) (gnomAD).

What do computational predictors say about EP300 p.Pro2176Ser (c.6526C>T)?

AlphaMissense predicts likely benign (score 0.0939) — an in-silico prediction, not a clinical call.

EP300 p.Pro2176Ser

c.6526C>T · rs779543207 · VCV341825

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.0939 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00254%, nfe)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

Rubinstein-Taybi syndrome due to EP300 haploinsufficiency

Computational evidence

Protein change
AlphaMissense	0.0939	likely benign
REVEL	0.14	moderately benign-leaning
SaProt	LLR -4.88	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.4	GERP 0.16, phastCons 0.074
Regional constraint	o/e 1.26	unconstrained · MANE · 1,737 bp · p 6.7e-13 · regional, not allelic
Overall
CADD	14.89	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00254% European (non-Finnish) · 30/1,180,034 alleles

Filtering AF 0.0018% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00156%

Overall 0.00192% 31/1,613,998 alleles · very rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.00254%	39,334
African / African-American	0.00133%	74,908

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.Pro2176Ser
Coding: c.6526C>T
MANE Select: NM_001429
dbSNP: rs779543207
Type: single nucleotide variant
Location: chr22:41178237 (GRCh38)
Gene constraint: LOEUF 0.164 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 54.88 · 60 PDB
Residue 2176: the 'interaction with htlv-1 tax' region; the 'interaction with ncoa2' 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.Pro2176Thr Uncertain significance ★★ ⚠ 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-pro2176ser (accessed [today's date]).

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