TTC19 c.676+251T>C
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
low-frequency (popmax 3.72%, afr)
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| Splicing | ||
| Splice region | donor +251 | deep intronic (+251 nt into the intron) |
|---|---|---|
| SpliceAI | — | not assessed · no allele here is in the release |
| Constraint at this position | ||
| Conservation | phyloP 0.61 | GERP -3.4, phastCons 0.007 |
| Non-coding constraint | Z 2.37 | 1 kb window · o/e 0.83 · regional · uncalibrated |
| Overall | ||
| CADD | 7.69 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
3.72%
African / African-American · 1,547/41,568 alleles
Filtering AF
3.57%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 3.5%
Overall
1.06%
1,618/152,314 alleles · low-frequency
| Ancestry group | Frequency | 1 in |
|---|---|---|
| African / African-Americangrpmax | 3.72% | 27 |
| Remaining individualsnot grpmax-eligible | 0.803% | 124 |
| Admixed American | 0.32% | 312 |
| European (non-Finnish) | 0.00735% | 13,607 |
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
- TTC19
- Coding
- c.676+251T>C
- MANE Select
- NM_017775
- dbSNP
- rs116207391
- Type
- single nucleotide variant
- Location
- chr17:16006819 (GRCh38)
- Gene constraint
- LOEUF 1.049 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 80.28
Similar variants
- TTC19 c.581+1G>C Pathogenic/Likely pathogenic ★★ same type
- TTC19 p.Gln195Ter Pathogenic/Likely pathogenic ★★ same type
- TTC19 p.Leu185Pro Pathogenic/Likely pathogenic ★★ same type
- TTC19 p.Leu219Ter Pathogenic ★★ same type
- TTC19 c.581+4A>C Uncertain significance ★★ same type
- TTC19 c.994+3A>T Uncertain significance ★★ same type
- TTC19 p.Ala122Thr Uncertain significance ★★ ⚠ same type
- TTC19 p.Ala200Val 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/ttc19-c-676-plus-251t-c (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown