CTBP1 p.Asp26=
c.78C>T · rs750540871 · VCV794096
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
very rare (popmax 0.0033%, sas)
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 | GERP -0.76, phastCons 1 |
| Overall | ||
| CADD | 12.76 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.0033%
South Asian · 3/90,876 alleles
Filtering AF
0.000877%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.000443%
Overall
0.000249%
4/1,603,750 alleles · very rare
| Ancestry group | Frequency | 1 in |
|---|---|---|
| South Asiangrpmax | 0.0033% | 30,292 |
| Remaining individualsnot grpmax-eligible | 0.00162% | 61,892 |
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
- CTBP1
- Protein
- p.Asp26=
- Coding
- c.78C>T
- MANE Select
- NM_001012614
- dbSNP
- rs750540871
- Type
- single nucleotide variant
- Location
- chr4:1238267 (GRCh38)
- Gene constraint
- LOEUF 0.533 · pLI 0.95 (gnomAD)
- Structure
- AlphaFold pLDDT 84.08 · 11 PDB
- Residue 26
- the 'interaction with glis2 1' region
Similar variants
- CTBP1 p.Asp26Glu Uncertain significance ★ ⚠ same residue
- CTBP1 p.Arg331Trp Pathogenic ★★ ⚠ same type
- CTBP1 c.-205C>G Uncertain significance ★★ ⚠ same type
- CTBP1 p.Ala384Pro Uncertain significance ★★ ⚠ same type
- CTBP1 p.Ala404Val Uncertain significance ★★ ⚠ same type
- CTBP1 p.Arg173Cys Uncertain significance ★★ ⚠ same type
- CTBP1 p.Gln137His Uncertain significance ★★ ⚠ same type
- CTBP1 p.Gly399Ser Uncertain significance ★★ ⚠ same type
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/ctbp1-p-asp26 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown