TBCD p.Ala422=
c.1266G>A · rs754912961 · VCV2725833
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
ultra-rare (popmax 0.0165%, mid)
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| Splicing | ||
| SpliceAI | <0.2 | no splice effect predicted · four deltas, not one · how we know |
|---|---|---|
| Constraint at this position | ||
| Conservation | phyloP -3.8 | GERP -3.1 |
| Overall | ||
| CADD | 5.462 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.0165%
Middle Eastern · 1/6,060 alleles
Filtering AF
0.00215%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.00191%
Overall
0.00254%
41/1,613,532 alleles · ultra-rare
exomes 39/1,461,288 · genomes 2/152,244 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| Middle Easterngrpmax | 0.0165% | 6,060 |
| European (non-Finnish) | 0.00297% | 33,707 |
| African / African-American | 0.00267% | 37,506 |
| South Asian | 0.0022% | 45,503 |
| Admixed American | 0.00167% | 59,988 |
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
- TBCD
- Protein
- p.Ala422=
- Coding
- c.1266G>A
- MANE Select
- NM_005993
- dbSNP
- rs754912961
- Type
- single nucleotide variant
- Location
- chr17:82814882 (GRCh38)
- Gene constraint
- LOEUF 0.763 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 90.45 · 6 PDB
Similar variants
- TBCD p.Ala422Val Conflicting classifications of pathogenicity ★ same residue
- TBCD c.1224-2A>G Pathogenic/Likely pathogenic ★★ same type
- TBCD c.2007-2A>G Likely pathogenic ★★ same type
- TBCD p.Ala475Thr Pathogenic/Likely pathogenic ★★ same type
- TBCD p.Ala554Val Pathogenic/Likely pathogenic ★★ same type
- TBCD p.Arg113Ter Pathogenic/Likely pathogenic ★★ same type
- TBCD p.Arg303Ter Pathogenic/Likely pathogenic ★★ same type
- TBCD p.Arg323Ter Pathogenic/Likely pathogenic ★★ 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/tbcd-p-ala422 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown