EP300 p.Pro1866=
c.5598G>A · rs560633624 · VCV727344
Benign/Likely benign
Multiple submitters
Classification
Benign/Likely benign
ClinVar
Review
Multiple submitters ★★☆☆
ClinVar · 2 submitters
gnomAD v4.1
Rare
ultra-rare (popmax 0.0825%, mid)
Conditions
1
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 -7.2 | GERP -4.8 |
| Overall | ||
| CADD | 0.157 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.0825%
Middle Eastern · 5/6,062 alleles
Filtering AF
0.035%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.0311%
Overall
0.0096%
155/1,613,830 alleles · ultra-rare
| Ancestry group | Frequency | 1 in |
|---|---|---|
| Middle Easterngrpmax | 0.0825% | 1,212 |
| South Asian | 0.0461% | 2,168 |
| East Asian | 0.0312% | 3,203 |
| Remaining individualsnot grpmax-eligible | 0.016% | 6,250 |
| Admixed American | 0.00667% | 14,995 |
| European (non-Finnish) | 0.00636% | 15,733 |
| Finnishnot grpmax-eligible | 0.00469% | 21,329 |
| Ashkenazi Jewishnot grpmax-eligible | 0.00338% | 29,606 |
| African / African-American | 0.00134% | 74,902 |
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.Pro1866=
- Coding
- c.5598G>A
- MANE Select
- NM_001429
- dbSNP
- rs560633624
- Type
- single nucleotide variant
- Location
- chr22:41177309 (GRCh38)
- Gene constraint
- LOEUF 0.164 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
- Structure
- AlphaFold pLDDT 54.88 · 60 PDB
- Residue 1866
- the 'disordered' region
Similar variants
- EP300 p.Pro1866Leu Conflicting classifications of pathogenicity ★ ⚠ same residue
- EP300 p.Pro1866Gln 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
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-pro1866 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown