Is GAA p.Ala495= (c.1485C>T) pathogenic?

GAA p.Ala495= (c.1485C>T) is classified Likely benign in GAA (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-11-13). Ultra-rare (popmax 0.0423%, eas); Associated with glycogen storage disease II.

What condition is associated with GAA p.Ala495= (c.1485C>T)?

GAA p.Ala495= (c.1485C>T) is associated with glycogen storage disease II (ClinVar).

How common is GAA p.Ala495= (c.1485C>T) in the general population?

GAA p.Ala495= (c.1485C>T) is ultra-rare (popmax 0.0423%, eas) (gnomAD).

GAA p.Ala495=

Q: How is Glycogen storage disease due to acid maltase deficiency inherited?

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

c.1485C>T · rs765596792 · VCV1177270

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0423%, eas)

Conditions

glycogen storage disease II

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation/SpliceAI carries the signal.
Splicing
SpliceAI	Δ0.20	acceptor gain · deltas
Constraint at this position
Conservation	phyloP -0.45	GERP -2.7, phastCons 0.001
Overall
CADD	8.114	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0423% East Asian · 19/44,872 alleles

Filtering AF 0.0277% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.023%

Overall 0.00124% 20/1,614,156 alleles · ultra-rare exomes 20/1,461,840 · genomes 0/152,316 · joint denominator

Ancestry group	Frequency	1 in
East Asiangrpmax	0.0423%	2,362
Admixed American	0.00167%	60,026

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: GAA
Protein: p.Ala495=
Coding: c.1485C>T
MANE Select: NM_000152
dbSNP: rs765596792
Type: single nucleotide variant
Location: chr17:80110774 (GRCh38)
Gene constraint: LOEUF 1.008 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 92.32 · 19 PDB
Residue 495: an α-helix

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

Disease context

glycogen storage disease II — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Glycogen storage disease due to acid maltase deficiency (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Adult, Antenatal, Childhood, Infancy, Neonatal
Prevalence: 1-9 / 1 000 000 (Europe)

Similar variants

GAA p.Ala495Val Uncertain significance ★★ ⚠ same residue
GAA p.Ala495fs Pathogenic ★ same residue
GAA c.1076-1G>C Pathogenic ★★★ same condition
GAA c.1076-22T>G Pathogenic ★★★ same condition
GAA c.1194+5G>A Likely pathogenic ★★★ same condition
GAA c.1326+1G>A Pathogenic ★★★ same condition
GAA c.1327-2A>G Pathogenic ★★★ same condition
GAA c.1437+1G>A 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/gaa-p-ala495 (accessed [today's date]).

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