Is AGRN p.Arg411Cys (c.1231C>T) pathogenic?

AGRN p.Arg411Cys (c.1231C>T) is classified Uncertain significance in AGRN (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-10-20). Very rare (popmax 0.0011%, sas); Associated with Inborn genetic diseases.

What condition is associated with AGRN p.Arg411Cys (c.1231C>T)?

AGRN p.Arg411Cys (c.1231C>T) is associated with Inborn genetic diseases, congenital myasthenic syndrome 8 (ClinVar).

How common is AGRN p.Arg411Cys (c.1231C>T) in the general population?

AGRN p.Arg411Cys (c.1231C>T) is very rare (popmax 0.0011%, sas) (gnomAD).

AGRN p.Arg411Cys

c.1231C>T · rs1644956705 · VCV2417520

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.0011%, sas)

Conditions

Inborn genetic diseases

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.29	benign-leaning
Splicing
SpliceAI	<0.2	all four deltas below 0.2 · C>A here scores Δ0.23 · evaluated, not missing
Constraint at this position
Conservation	phyloP 5.8	GERP 1.3, phastCons 1
Regional constraint	o/e 1.03	unconstrained · MANE · 26 kb · p 0.29 · regional, not allelic
Overall
CADD	26.4	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0011% South Asian · 1/91,054 alleles

Filtering AF 0.000247% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000159%

Overall 0.000548% 8/1,459,130 alleles · very rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0011%	91,054
European (non-Finnish)	0.000593%	168,526

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.Arg411Cys
Coding: c.1231C>T
MANE Select: NM_198576
dbSNP: rs1644956705
Type: single nucleotide variant
Location: chr1:1042009 (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 411: the kazal-like 4 domain

Full AGRN gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Inborn genetic diseases — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: congenital myasthenic syndrome 8

Similar variants

AGRN p.Arg411His Uncertain significance ★★ 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
AGRN c.1384+6C>T 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-arg411cys (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown