Is PGM1 p.Ala98= (c.294T>A) pathogenic?

PGM1 p.Ala98= (c.294T>A) is classified Likely benign in PGM1 (ClinVar, Multiple submitters, 4 submitters; last evaluated 2026-01-26). Ultra-rare (popmax 0.0188%, nfe); Associated with PGM1-congenital disorder of glycosylation.

What condition is associated with PGM1 p.Ala98= (c.294T>A)?

PGM1 p.Ala98= (c.294T>A) is associated with PGM1-congenital disorder of glycosylation (ClinVar).

How common is PGM1 p.Ala98= (c.294T>A) in the general population?

PGM1 p.Ala98= (c.294T>A) is ultra-rare (popmax 0.0188%, nfe) (gnomAD).

How is PGM1-CDG inherited?

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

PGM1 p.Ala98=

c.294T>A · rs777459281 · VCV513808

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 4 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0188%, nfe)

Conditions

PGM1-congenital disorder of glycosylation

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	<0.2	no splice effect predicted · four deltas, not one · how we know
Constraint at this position
Conservation	phyloP -1.3	GERP -3.5, phastCons 0.001
Overall
CADD	8.186	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0188% European (non-Finnish) · 222/1,179,688 alleles

Filtering AF 0.0167% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.016%

Overall 0.014% 226/1,613,690 alleles · ultra-rare exomes 212/1,461,478 · genomes 14/152,212 · joint denominator

Ancestry group	Frequency	1 in
European (non-Finnish)grpmax	0.0188%	5,314
Remaining individualsnot grpmax-eligible	0.0032%	31,239
African / African-American	0.00267%	37,455

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: PGM1
Protein: p.Ala98=
Coding: c.294T>A
MANE Select: NM_002633
dbSNP: rs777459281
Type: single nucleotide variant
Location: chr1:63629472 (GRCh38)
Gene constraint: LOEUF 1.189 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 97.27 · 16 PDB
Residue 98: an α-helix

Full PGM1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

PGM1-congenital disorder of glycosylation — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For PGM1-CDG (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

Similar variants

PGM1 p.Arg217Ter Pathogenic ★★ same condition
PGM1 p.Arg293Ter Pathogenic/Likely pathogenic ★★ same condition
PGM1 p.Arg499Ter Pathogenic/Likely pathogenic ★★ same condition
PGM1 p.Arg503Ter Pathogenic ★★ same condition
PGM1 p.Arg515Gln Pathogenic/Likely pathogenic ★★ same condition
PGM1 p.Asp263Tyr Pathogenic/Likely pathogenic ★★ same condition
PGM1 p.Gly291Arg Pathogenic/Likely pathogenic ★★ same condition
PGM1 p.Gly330Arg Pathogenic/Likely pathogenic ★★ 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/pgm1-p-ala98 (accessed [today's date]).

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