Is GBE1 p.Ala21= (c.63C>T) pathogenic?

GBE1 p.Ala21= (c.63C>T) is classified Likely benign in GBE1 (ClinVar, Single submitter, 1 submitter; last evaluated 2021-05-31). Absent from gnomAD v4.1; Associated with Glycogen storage disease IV, classic hepatic.

What condition is associated with GBE1 p.Ala21= (c.63C>T)?

GBE1 p.Ala21= (c.63C>T) is associated with Glycogen storage disease IV, classic hepatic, glycogen storage disease due to glycogen branching enzyme deficiency (ClinVar).

How common is GBE1 p.Ala21= (c.63C>T) in the general population?

GBE1 p.Ala21= (c.63C>T) is absent from gnomAD v4.1 (gnomAD).

GBE1 p.Ala21=

c.63C>T · rs2107250762 · VCV1562738

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Absent

absent from gnomAD v4.1

Conditions

Glycogen storage disease IV, classic hepatic

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.19	GERP -1.6, phastCons 0.002
Overall
CADD	10.09	PHRED · no single calibrated threshold — expert panels disagree

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: GBE1
Protein: p.Ala21=
Coding: c.63C>T
MANE Select: NM_000158
dbSNP: rs2107250762
Type: single nucleotide variant
Location: chr3:81761455 (GRCh38)
Gene constraint: LOEUF 1.211 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 96.30 · 3 PDB

Full GBE1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

Glycogen storage disease IV, classic hepatic — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: glycogen storage disease due to glycogen branching enzyme deficiency

Similar variants

GBE1 c.1109-1G>T Likely pathogenic ★★ same condition
GBE1 c.1236+1G>A Likely pathogenic ★★ same condition
GBE1 c.1336-1G>A Pathogenic/Likely pathogenic ★★ same condition
GBE1 c.143+1G>A Pathogenic ★★ same condition
GBE1 c.143+2T>C Pathogenic/Likely pathogenic ★★ same condition
GBE1 c.144-1G>C Pathogenic/Likely pathogenic ★★ same condition
GBE1 c.1618+1G>A Pathogenic/Likely pathogenic ★★ same condition
GBE1 c.1803+2T>C 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/gbe1-p-ala21 (accessed [today's date]).

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