AGRN p.Ala1663Val
c.4988C>T · rs753922672 · VCV1388860
Uncertain significance
Single submitter
Classification
Uncertain significance
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
very rare (popmax 0.00534%, afr)
Conditions
1
congenital myasthenic syndrome 8
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| REVEL | 0.197 | benign-leaning |
|---|---|---|
| Splicing | ||
| SpliceAI | — | not assessed · no allele here is in the release |
| Constraint at this position | ||
| Conservation | phyloP -1.1 | GERP -2.6 |
| Regional constraint | o/e 1.02 | unconstrained · MANE · 8,500 bp · p 0.41 · regional, not allelic |
| Overall | ||
| CADD | 16.32 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.00534%
African / African-American · 4/74,884 alleles
Filtering AF
0.00175%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.00104%
Overall
0.000558%
9/1,612,748 alleles · very rare
| Ancestry group | Frequency | 1 in |
|---|---|---|
| African / African-Americangrpmax | 0.00534% | 18,721 |
| East Asian | 0.00223% | 44,890 |
| Remaining individualsnot grpmax-eligible | 0.0016% | 62,464 |
| European (non-Finnish) | 0.000254% | 393,290 |
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
- AGRN
- Protein
- p.Ala1663Val
- Coding
- c.4988C>T
- MANE Select
- NM_198576
- dbSNP
- rs753922672
- Type
- single nucleotide variant
- Location
- chr1:1050438 (GRCh38)
- Gene constraint
- LOEUF 0.73 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
- Structure
- AlphaFold pLDDT 69.79 · 1 PDB
- Residue 1663
- the laminin g-like 2 domain
Similar variants
- AGRN p.Ala1663Thr Uncertain significance ★ same residue
- AGRN p.Ala1663= Likely benign ★ same residue
- AGRN c.3632-1G>C Likely pathogenic ★★ same condition
- AGRN p.Arg1671Ter Pathogenic/Likely pathogenic ★★ same condition
- AGRN p.Arg834Ter Pathogenic/Likely pathogenic ★★ same condition
- AGRN p.Gly1582Arg Pathogenic ★★ same condition
- AGRN p.Gly1675Ser Pathogenic/Likely pathogenic ★★ same condition
- AGRN c.1177+4A>G 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/agrn-p-ala1663val (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown