Is AGRN p.Asp1174= (c.3522C>T) pathogenic?

AGRN p.Asp1174= (c.3522C>T) is classified Likely benign in AGRN (ClinVar, Multiple submitters, 4 submitters; last evaluated 2025-12-24). Ultra-rare (popmax 0.0472%, sas); Associated with congenital myasthenic syndrome 8.

What condition is associated with AGRN p.Asp1174= (c.3522C>T)?

AGRN p.Asp1174= (c.3522C>T) is associated with congenital myasthenic syndrome 8 (ClinVar).

How common is AGRN p.Asp1174= (c.3522C>T) in the general population?

AGRN p.Asp1174= (c.3522C>T) is ultra-rare (popmax 0.0472%, sas) (gnomAD).

AGRN p.Asp1174=

c.3522C>T · rs374008359 · VCV1635022

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0472%, sas)

Conditions

congenital myasthenic syndrome 8

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 -9	GERP -2.6
Overall
CADD	1.713	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0472% South Asian · 43/91,090 alleles

Filtering AF 0.036% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0321%

Overall 0.00577% 93/1,612,932 alleles · ultra-rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0472%	2,118
Middle Eastern	0.033%	3,031
Admixed American	0.00666%	15,007
Remaining individualsnot grpmax-eligible	0.0048%	20,831
European (non-Finnish)	0.00339%	29,500
Ashkenazi Jewishnot grpmax-eligible	0.00338%	29,606

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.Asp1174=
Coding: c.3522C>T
MANE Select: NM_198576
dbSNP: rs374008359
Type: single nucleotide variant
Location: chr1:1047578 (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 1174: the sea domain

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

Disease context

congenital myasthenic syndrome 8 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

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-asp1174 (accessed [today's date]).

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