Is ALG2 p.Arg130Trp (c.388C>T) pathogenic?

ALG2 p.Arg130Trp (c.388C>T) is classified Uncertain significance in ALG2 (ClinVar, Single submitter, 1 submitter; last evaluated 2025-07-10). AlphaMissense: likely benign (0.1704); Ultra-rare (popmax 0.0176%, sas); Associated with ALG2-congenital disorder of glycosylation.

What condition is associated with ALG2 p.Arg130Trp (c.388C>T)?

ALG2 p.Arg130Trp (c.388C>T) is associated with ALG2-congenital disorder of glycosylation, congenital myasthenic syndrome 14 (ClinVar).

How common is ALG2 p.Arg130Trp (c.388C>T) in the general population?

ALG2 p.Arg130Trp (c.388C>T) is ultra-rare (popmax 0.0176%, sas) (gnomAD).

How is ALG2-CDG inherited?

Typically Autosomal recessive (Orphanet). A genetic counselor can assess individual risk for a family.

What do computational predictors say about ALG2 p.Arg130Trp (c.388C>T)?

AlphaMissense predicts likely benign (score 0.1704) — an in-silico prediction, not a clinical call.

ALG2 p.Arg130Trp

c.388C>T · rs780287266 · VCV967908

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1704 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0176%, sas)

Missense predictors

1/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

ALG2-congenital disorder of glycosylation

Computational evidence

Protein change
AlphaMissense	0.1704	likely benign
REVEL	0.378	indeterminate
SaProt	LLR -11.06	damaging
⇒ SaProt calls this damaging; AlphaMissense does not; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 12	phastCons 1
Regional constraint	o/e 1.09	unconstrained · MANE · 3,957 bp · p 0.038 · regional, not allelic
Overall
CADD	24.9	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0176% South Asian · 16/91,086 alleles

Filtering AF 0.011% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00888%

Overall 0.00423% 68/1,608,648 alleles · ultra-rare

Ancestry group	Frequency	1 in
Ashkenazi Jewishnot grpmax-eligible	0.0405%	2,467
South Asiangrpmax	0.0176%	5,693
Middle Eastern	0.0164%	6,082
East Asian	0.00891%	11,225
Remaining individualsnot grpmax-eligible	0.00641%	15,613
Admixed American	0.005%	19,997
European (non-Finnish)	0.00229%	43,702
African / African-American	0.00134%	74,864

Ashkenazi Jewish shows a higher raw frequency than the grpmax group above it. gnomAD excludes bottlenecked groups — Finnish, Ashkenazi Jewish, Amish and “Remaining individuals” — from grpmax, because founder effects make their frequencies unrepresentative for filtering. The table is sorted by frequency, so an excluded group can sit above the grpmax row.

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: ALG2
Protein: p.Arg130Trp
Coding: c.388C>T
MANE Select: NM_033087
dbSNP: rs780287266
Type: single nucleotide variant
Location: chr9:99218797 (GRCh38)
Gene constraint: LOEUF 1.408 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 91.03

Full ALG2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

ALG2-congenital disorder of glycosylation — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: congenital myasthenic syndrome 14

For ALG2-CDG (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

ALG2 p.Arg130Gln Uncertain significance ★★ ⚠ same residue
ALG2 p.Arg130= Benign ★ same residue
ALG2 p.Arg130del Uncertain significance ★ same residue
ALG2 p.Ala29Pro Uncertain significance ★★ ⚠ same condition
ALG2 p.Ala36Val Uncertain significance ★★ ⚠ same condition
ALG2 p.Ala71Gly Uncertain significance ★★ ⚠ same condition
ALG2 p.Ala71Val Uncertain significance ★★ ⚠ same condition
ALG2 p.Arg129Gln 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/alg2-p-arg130trp (accessed [today's date]).

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