TTC7A p.Ser446=
c.1338G>A · rs768056090 · VCV1008342
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
ultra-rare (popmax 0.0164%, mid)
Conditions
1
multiple intestinal atresia
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 -11 | GERP -5.1 |
| Overall | ||
| CADD | 1.438 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.0164%
Middle Eastern · 1/6,082 alleles
Filtering AF
0.000688%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.000539%
Overall
0.00112%
18/1,612,294 alleles · ultra-rare
exomes 17/1,460,118 · genomes 1/152,176 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| Middle Easterngrpmax | 0.0164% | 6,082 |
| East Asian | 0.00223% | 44,884 |
| Remaining individualsnot grpmax-eligible | 0.0016% | 62,458 |
| African / African-American | 0.00133% | 74,924 |
| European (non-Finnish) | 0.00119% | 84,282 |
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
- TTC7A
- Protein
- p.Ser446=
- Coding
- c.1338G>A
- MANE Select
- NM_020458
- dbSNP
- rs768056090
- Type
- single nucleotide variant
- Location
- chr2:47011381 (GRCh38)
- Gene constraint
- LOEUF 1.198 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
- Structure
- AlphaFold pLDDT 84.59
Similar variants
- TTC7A p.Ser446Leu Conflicting classifications of pathogenicity ★ ⚠ same residue
- TTC7A c.1288-1G>T Pathogenic/Likely pathogenic ★★ same condition
- TTC7A c.1641+1G>A Likely pathogenic ★★ same condition
- TTC7A c.2018-1G>C Pathogenic/Likely pathogenic ★★ same condition
- TTC7A p.Arg138Ter Pathogenic/Likely pathogenic ★★ same condition
- TTC7A p.Arg358Ter Pathogenic/Likely pathogenic ★★ same condition
- TTC7A p.Arg405Ter Pathogenic/Likely pathogenic ★★ same condition
- TTC7A p.Cys623Ter 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/ttc7a-p-ser446 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown