TTC19 c.581+1G>A
Pathogenic
Single submitter
Classification
Pathogenic
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
Consequence
canonical splice-site (±1/±2)
predicted LoF
gnomAD v4.1
Absent
absent from gnomAD v4.1
Conditions
1
mitochondrial complex III deficiency nuclear type 2
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal. | ||
| Consequence | canonical splice-site (±1/±2) | predicted loss-of-function |
|---|---|---|
| Splicing | ||
| Splice region | donor +1 | canonical splice dinucleotide (donor +1) · inside the BP7-excluded zone |
| SpliceAI | Δ0.96 | donor loss · deltas |
| Pangolin | Δ0.62 | loss · gain 0.11 · agrees with SpliceAI · independent |
| Constraint at this position | ||
| Conservation | phyloP 12 | GERP 1.7, phastCons 1 |
| Non-coding constraint | Z 2.14 | 1 kb window · o/e 0.84 · regional · uncalibrated |
| Overall | ||
| CADD | 34.0 | PHRED · no single calibrated threshold — expert panels disagree |
Predicted loss-of-function is descriptive, not an applied PVS1 code.
Population frequency
gnomAD v4.1 · exomes + genomes
Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.
Variant & gene context
- Gene
- TTC19
- Coding
- c.581+1G>A
- MANE Select
- NM_017775
- dbSNP
- rs1970827663
- Type
- single nucleotide variant
- Location
- chr17:16004263 (GRCh38)
- Gene constraint
- LOEUF 1.049 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 80.28
Similar variants
- TTC19 p.Gln195Ter Pathogenic/Likely pathogenic ★★ same condition
- TTC19 p.Leu185Pro Pathogenic/Likely pathogenic ★★ same condition
- TTC19 p.Leu219Ter Pathogenic ★★ same condition
- TTC19 c.581+4A>C Uncertain significance ★★ same condition
- TTC19 c.994+3A>T Uncertain significance ★★ same condition
- TTC19 p.Ala122Thr Uncertain significance ★★ ⚠ same condition
- TTC19 p.Ala263Ser Uncertain significance ★★ ⚠ same condition
- TTC19 p.Arg102Gly Uncertain significance ★★ ⚠ 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/ttc19-c-581-plus-1g-a (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown