Is CREBBP p.Arg768= (c.2304A>G) pathogenic?

CREBBP p.Arg768= (c.2304A>G) is classified Likely benign in CREBBP (ClinVar, Single submitter, 1 submitter; last evaluated 2024-06-27). Very rare (popmax 0.00401%, afr); Associated with Rubinstein-Taybi syndrome.

What condition is associated with CREBBP p.Arg768= (c.2304A>G)?

CREBBP p.Arg768= (c.2304A>G) is associated with Rubinstein-Taybi syndrome (ClinVar).

How common is CREBBP p.Arg768= (c.2304A>G) in the general population?

CREBBP p.Arg768= (c.2304A>G) is very rare (popmax 0.00401%, afr) (gnomAD).

CREBBP p.Arg768=

c.2304A>G · VCV3667200

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.00401%, afr)

Conditions

Rubinstein-Taybi syndrome

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 -0.81	GERP -3.3, phastCons 0.013
Overall
CADD	6.993	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00401% African / African-American · 3/74,812 alleles

Filtering AF 0.00106% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000495%

Overall 0.000186% 3/1,612,030 alleles · very rare

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: CREBBP
Protein: p.Arg768=
Coding: c.2304A>G
MANE Select: NM_004380
Type: single nucleotide variant
Location: chr16:3773910 (GRCh38)
Gene constraint: LOEUF 0.101 · pLI 1.00 · ClinGen HI 3/3 (gnomAD)
Structure: AlphaFold pLDDT 54.31 · 144 PDB

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

Disease context

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

Similar variants

CREBBP p.Arg768Ter Pathogenic ★★ same residue
CREBBP p.Arg768Gln Conflicting classifications of pathogenicity ★ ⚠ same residue
CREBBP p.Arg768Leu Uncertain significance ⚠ same residue
CREBBP c.2881-13G>A Pathogenic/Likely pathogenic ★★ same condition
CREBBP c.3779+1G>A Pathogenic ★★ same condition
CREBBP c.3779+1G>T Pathogenic ★★ same condition
CREBBP c.3836+1G>A Pathogenic ★★ same condition
CREBBP p.Arg1103Ter 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/crebbp-p-arg768 (accessed [today's date]).

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