AGRN p.Phe609Ser
c.1826T>C · rs1246417325 · VCV1490487
Uncertain significance
Single submitter
Classification
Uncertain significance
ClinVar
Review
Single submitter ★☆☆☆
ClinVar · 1 submitter
gnomAD v4.1
Rare
very rare (popmax 0.00167%, amr)
Conditions
1
congenital myasthenic syndrome 8
Computational evidence
| Protein change | ||
| Missense predictors do not apply to this variant type; conservation carries the signal. | ||
| REVEL | 0.64 | indeterminate |
|---|---|---|
| Splicing | ||
| SpliceAI | <0.2 | all four deltas below 0.2 · T>A here scores Δ0.23 · evaluated, not missing |
| Constraint at this position | ||
| Conservation | phyloP 7.7 | GERP 0.98, phastCons 1 |
| Regional constraint | o/e 1.03 | unconstrained · MANE · 26 kb · p 0.29 · regional, not allelic |
| Overall | ||
| CADD | 24.9 | PHRED · no single calibrated threshold — expert panels disagree |
Population frequency
gnomAD v4.1 · exomes + genomes
Grpmax group
0.00167%
Admixed American · 1/60,000 alleles
Filtering AF
0.000292%
ClinGen BA1/BS1 input
FAF95, joint · FAF99 0.000211%
Overall
0.000621%
10/1,611,374 alleles · very rare
exomes 10/1,459,422 · genomes 0/151,952 · joint denominator
| Ancestry group | Frequency | 1 in |
|---|---|---|
| Admixed Americangrpmax | 0.00167% | 60,000 |
| Remaining individualsnot grpmax-eligible | 0.0016% | 62,470 |
| European (non-Finnish) | 0.000678% | 147,473 |
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.Phe609Ser
- Coding
- c.1826T>C
- MANE Select
- NM_198576
- dbSNP
- rs1246417325
- Type
- single nucleotide variant
- Location
- chr1:1043850 (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 609
- the kazal-like 7 domain
Similar variants
- 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
- AGRN c.1384+6C>T Uncertain significance ★★ same condition
- AGRN c.4879+4G>A 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-phe609ser (accessed [today's date]).
Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown