ALG3 p.Cys307Ter
c.921C>A · rs1718972826 · VCV3076030
Likely pathogenic
Single submitter
Classification
Likely pathogenic
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
Consequence
nonsense (stop-gain)
predicted LoF
gnomAD v4.1
Absent
absent from gnomAD v4.1
Conditions
1
congenital disorder of glycosylation
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| Consequence | nonsense (stop-gain) | predicted loss-of-function |
|---|---|---|
| NMD | predicted | premature termination codon in exon 6 of 9 |
| REVEL | 0.474 | indeterminate |
| Splicing | ||
| SpliceAI | — | not assessed · no allele here is in the release |
| Constraint at this position | ||
| Conservation | phyloP 4.5 | GERP -0.56, phastCons 1 |
| Overall | ||
| CADD | 36.0 | 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
- ALG3
- Protein
- p.Cys307Ter
- Coding
- c.921C>A
- MANE Select
- NM_005787
- dbSNP
- rs1718972826
- Type
- single nucleotide variant
- Location
- chr3:184243802 (GRCh38)
- Gene constraint
- LOEUF 0.972 · pLI <0.01 (gnomAD)
- Structure
- AlphaFold pLDDT 89.05
Similar variants
- ALG3 p.Cys307Tyr Uncertain significance ★ ⚠ same residue
- ALG3 c.444+1G>T Likely pathogenic ★★ same type
- ALG3 p.Arg171Gln Pathogenic/Likely pathogenic ★★ same type
- ALG3 p.Arg266Cys Pathogenic ★★ same type
- ALG3 p.Arg354Cys Likely pathogenic ★★ same type
- ALG3 p.Arg354His Pathogenic/Likely pathogenic ★★ same type
- ALG3 p.Asn174Ser Likely pathogenic ★★ ⚠ same type
- ALG3 p.Gly55= 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/alg3-p-cys307ter (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown