Is ALG12 p.Ala177Thr (c.529G>A) pathogenic?

ALG12 p.Ala177Thr (c.529G>A) is classified Uncertain significance in ALG12 (ClinVar, Single submitter, 1 submitter; last evaluated 2022-03-24). AlphaMissense: likely benign (0.1627); Very rare (popmax 0.00017%, nfe); Associated with ALG12-congenital disorder of glycosylation.

What condition is associated with ALG12 p.Ala177Thr (c.529G>A)?

ALG12 p.Ala177Thr (c.529G>A) is associated with ALG12-congenital disorder of glycosylation (ClinVar).

How common is ALG12 p.Ala177Thr (c.529G>A) in the general population?

ALG12 p.Ala177Thr (c.529G>A) is very rare (popmax 0.00017%, nfe) (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.Ala177Thr (c.529G>A)?

AlphaMissense predicts likely benign (score 0.1627) — an in-silico prediction, not a clinical call.

ALG12 p.Ala177Thr

c.529G>A · rs1186957751 · VCV1431874

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.1627 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 0.00017%, nfe)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

ALG12-congenital disorder of glycosylation

Computational evidence

Protein change
AlphaMissense	0.1627	likely benign
REVEL	0.323	indeterminate
SaProt	LLR -9.73	tolerated
⇒ AlphaMissense and SaProt both call this tolerated; REVEL makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 7.4	GERP 1.6, phastCons 1
Regional constraint	o/e 0.95	unconstrained · MANE · 9,924 bp · p 0.17 · regional, not allelic
Overall
CADD	25.3	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

Grpmax group 0.00017% European (non-Finnish) · 2/1,179,888 alleles

Filtering AF 2.8e-05% ClinGen BA1/BS1 input FAF95, joint · FAF99 1.1e-05%

Overall 0.000137% 2/1,461,220 alleles · very rare

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: ALG12
Protein: p.Ala177Thr
Coding: c.529G>A
MANE Select: NM_024105
dbSNP: rs1186957751
Type: single nucleotide variant
Location: chr22:49910029 (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

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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
ALG12 c.470-3C>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/alg12-p-ala177thr (accessed [today's date]).

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