CTSD p.Ala20=
c.60G>A · rs1225756370 · VCV1567861
Likely benign
Single submitter
Classification
Likely benign
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
very rare (popmax 0.00141%, afr)
Conditions
1
neuronal ceroid lipofuscinosis
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 -0.18 | GERP -1.7, phastCons 0.007 |
| Overall | ||
| CADD | 5.926 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.00141%
African / African-American · 1/70,918 alleles
Filtering AF
8.2e-05%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 5.5e-05%
Overall
0.000328%
5/1,525,794 alleles · very rare
| Ancestry group | Frequency | 1 in |
|---|---|---|
| African / African-Americangrpmax | 0.00141% | 70,918 |
| European (non-Finnish) | 0.00035% | 285,708 |
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
- CTSD
- Protein
- p.Ala20=
- Coding
- c.60G>A
- MANE Select
- NM_001909
- dbSNP
- rs1225756370
- Type
- single nucleotide variant
- Location
- chr11:1763800 (GRCh38)
- Gene constraint
- LOEUF 0.886 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 85.69 · 9 PDB
Similar variants
- CTSD c.228+1G>A Likely pathogenic ★★ same condition
- CTSD p.Glu82Ter Pathogenic/Likely pathogenic ★★ same condition
- CTSD c.828-3C>A Uncertain significance ★★ same condition
- CTSD p.Ala10Ser Uncertain significance ★★ ⚠ same condition
- CTSD p.Ala18Pro Uncertain significance ★★ ⚠ same condition
- CTSD p.Ala18Thr Uncertain significance ★★ ⚠ same condition
- CTSD p.Ala239Val Uncertain significance ★★ ⚠ same condition
- CTSD p.Arg176Lys 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/ctsd-p-ala20 (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown