Is ALG12 p.His289Arg (c.866A>G) pathogenic?

ALG12 p.His289Arg (c.866A>G) is classified Uncertain significance in ALG12 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-09-01). AlphaMissense: likely benign (0.0536); Absent from gnomAD v4.1; Associated with ALG12-congenital disorder of glycosylation.

What condition is associated with ALG12 p.His289Arg (c.866A>G)?

ALG12 p.His289Arg (c.866A>G) is associated with ALG12-congenital disorder of glycosylation (ClinVar).

How common is ALG12 p.His289Arg (c.866A>G) in the general population?

ALG12 p.His289Arg (c.866A>G) is absent from gnomAD v4.1 (gnomAD).

How is ALG12-CDG inherited?

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

What do computational predictors say about ALG12 p.His289Arg (c.866A>G)?

AlphaMissense predicts likely benign (score 0.0536) — an in-silico prediction, not a clinical call.

ALG12 p.His289Arg

c.866A>G · rs2519263330 · VCV2120710

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.0536 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

ALG12-congenital disorder of glycosylation

Computational evidence

Protein change
AlphaMissense	0.0536	likely benign
REVEL	0.12	moderately benign-leaning
SaProt	LLR -4.40	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -1.7	GERP -3.2
Regional constraint	o/e 0.95	unconstrained · MANE · 9,924 bp · p 0.17 · regional, not allelic
Overall
CADD	0.043	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: ALG12
Protein: p.His289Arg
Coding: c.866A>G
MANE Select: NM_024105
dbSNP: rs2519263330
Type: single nucleotide variant
Location: chr22:49907847 (GRCh38)
Gene constraint: LOEUF 0.965 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 93.26

Full ALG12 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

ALG12-congenital disorder of glycosylation — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For ALG12-CDG (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

ALG12 p.His289= Likely benign ★ same residue
ALG12 c.295+1G>A Pathogenic/Likely pathogenic ★★ same condition
ALG12 c.768+1G>A Likely pathogenic ★★ same condition
ALG12 p.Arg146Gln Pathogenic/Likely pathogenic ★★ same condition
ALG12 p.Arg202Ter Pathogenic/Likely pathogenic ★★ same condition
ALG12 p.Gly101Arg Likely pathogenic ★★ same condition
ALG12 p.Thr67Met Pathogenic/Likely pathogenic ★★ same condition
ALG12 c.469+5G>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/alg12-p-his289arg (accessed [today's date]).

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