Is GUSB p.Ala330Ser (c.988G>T) pathogenic?

GUSB p.Ala330Ser (c.988G>T) is classified Conflicting classifications of pathogenicity in GUSB (ClinVar, Conflicting submitters, 3 submitters; last evaluated 2025-08-29). AlphaMissense: likely benign (0.082); Rare (popmax 0.113%, sas); Associated with mucopolysaccharidosis type 7.

What condition is associated with GUSB p.Ala330Ser (c.988G>T)?

GUSB p.Ala330Ser (c.988G>T) is associated with mucopolysaccharidosis type 7 (ClinVar).

How common is GUSB p.Ala330Ser (c.988G>T) in the general population?

GUSB p.Ala330Ser (c.988G>T) is rare (popmax 0.113%, sas) (gnomAD).

How is Mucopolysaccharidosis type 7 inherited?

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

What do computational predictors say about GUSB p.Ala330Ser (c.988G>T)?

AlphaMissense predicts likely benign (score 0.082) — an in-silico prediction, not a clinical call.

GUSB p.Ala330Ser

c.988G>T · rs561880652 · VCV360552

Conflicting classifications of pathogenicity Conflicting submitters

Classification

Conflicting classifications of pathogenicity

ClinVar

Review

Conflicting submitters ★☆☆☆

ClinVar · 3 submitters

AlphaMissense

likely benign

0.082 · ACMG-weighted

gnomAD v4.1

Rare

rare (popmax 0.113%, sas)

Missense predictors

0/2 damaging

AlphaMissense, SaProt · REVEL no call

Conditions

mucopolysaccharidosis type 7

Computational evidence

Protein change
AlphaMissense	0.082	likely benign
REVEL	0.299	indeterminate
SaProt	LLR -6.38	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 -0.065	GERP -1.6, phastCons 0.001
Regional constraint	o/e 0.75	unconstrained · MANE · 15 kb · p 3.7e-08 · regional, not allelic
Overall
CADD	16.11	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.113% South Asian · 103/91,056 alleles

Filtering AF 0.0953% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.0888%

Overall 0.00744% 120/1,613,326 alleles · rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.113%	884
Middle Eastern	0.0827%	1,210
Remaining individualsnot grpmax-eligible	0.0048%	20,818
European (non-Finnish)	0.000763%	131,038

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: GUSB
Protein: p.Ala330Ser
Coding: c.988G>T
MANE Select: NM_000181
dbSNP: rs561880652
Type: single nucleotide variant
Location: chr7:65974996 (GRCh38)
Gene constraint: LOEUF 0.871 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 94.35 · 2 PDB
Residue 330: a β-strand

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

Disease context

mucopolysaccharidosis type 7 — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Mucopolysaccharidosis type 7 (Orphanet):

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

Similar variants

GUSB c.1244+1G>A Pathogenic ★★ same condition
GUSB c.581+1G>A Pathogenic/Likely pathogenic ★★ same condition
GUSB c.724+1G>T Pathogenic/Likely pathogenic ★★ same condition
GUSB p.Ala619Val Pathogenic/Likely pathogenic ★★ same condition
GUSB p.Arg110Ter Pathogenic/Likely pathogenic ★★ same condition
GUSB p.Arg167Ter Pathogenic/Likely pathogenic ★★ same condition
GUSB p.Arg216Trp Pathogenic/Likely pathogenic ★★ same condition
GUSB p.Arg357Ter 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/gusb-p-ala330ser (accessed [today's date]).

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