Is ALG9 p.Glu452= (c.1356A>G) pathogenic?

ALG9 p.Glu452= (c.1356A>G) is classified Likely benign in ALG9 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2026-01-12). Ultra-rare (popmax 0.0254%, nfe); Associated with ALG9-congenital disorder of glycosylation.

What condition is associated with ALG9 p.Glu452= (c.1356A>G)?

ALG9 p.Glu452= (c.1356A>G) is associated with ALG9-congenital disorder of glycosylation (ClinVar).

How common is ALG9 p.Glu452= (c.1356A>G) in the general population?

ALG9 p.Glu452= (c.1356A>G) is ultra-rare (popmax 0.0254%, nfe) (gnomAD).

How is ALG9-CDG inherited?

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

ALG9 p.Glu452=

c.1356A>G · rs200460892 · VCV387747

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0254%, nfe)

Conditions

ALG9-congenital disorder of glycosylation

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
REVEL	0.092	moderately benign-leaning
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 1.9	GERP 1.9, phastCons 1
Overall
CADD	8.814	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0254% European (non-Finnish) · 300/1,179,980 alleles

Filtering AF 0.023% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0221%

Overall 0.0197% 318/1,614,100 alleles · ultra-rare

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0254%	3,933
Remaining individualsnot grpmax-eligible	0.0096%	10,417
Finnishnot grpmax-eligible	0.00937%	10,671
African / African-American	0.008%	12,505

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: ALG9
Protein: p.Glu452=
Coding: c.1356A>G
MANE Select: NM_024740
dbSNP: rs200460892
Type: single nucleotide variant
Location: chr11:111837584 (GRCh38)
Gene constraint: LOEUF 0.853 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 88.35 · 2 PDB

Full ALG9 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

ALG9-congenital disorder of glycosylation — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For ALG9-CDG (Orphanet):

Inheritance: Autosomal recessive
Onset: Antenatal, Infancy, Neonatal

Similar variants

ALG9 c.566-1G>A Pathogenic/Likely pathogenic ★★ same condition
ALG9 c.896-2A>G Likely pathogenic ★★ same condition
ALG9 p.Arg143Ter Pathogenic/Likely pathogenic ★★ same condition
ALG9 p.Trp248Ter Pathogenic/Likely pathogenic ★★ same condition
ALG9 p.Tyr287Cys Pathogenic/Likely pathogenic ★★ same condition
ALG9 c.*1607C>T Uncertain significance ★★ same condition
ALG9 c.*1624A>C Uncertain significance ★★ same condition
ALG9 c.*1722C>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/alg9-p-glu452 (accessed [today's date]).

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