Is GALNS p.Ala482= (c.1446G>A) pathogenic?

GALNS p.Ala482= (c.1446G>A) is classified Likely benign in GALNS (ClinVar, Single submitter, 1 submitter; last evaluated 2024-07-23). Very rare (popmax 0.0023%, sas); Associated with mucopolysaccharidosis type 4A.

What condition is associated with GALNS p.Ala482= (c.1446G>A)?

GALNS p.Ala482= (c.1446G>A) is associated with mucopolysaccharidosis type 4A (ClinVar).

How common is GALNS p.Ala482= (c.1446G>A) in the general population?

GALNS p.Ala482= (c.1446G>A) is very rare (popmax 0.0023%, sas) (gnomAD).

How is Mucopolysaccharidosis type 4 inherited?

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

GALNS p.Ala482=

c.1446G>A · rs1468307106 · VCV3009051

Likely benign Single submitter

Classification

Likely benign

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

gnomAD v4.1

Rare

very rare (popmax 0.0023%, sas)

Conditions

mucopolysaccharidosis type 4A

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 -1.5	GERP -3.1
Overall
CADD	3.268	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0023% South Asian · 2/87,136 alleles

Filtering AF 0.000381% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000143%

Overall 0.000506% 8/1,582,522 alleles · very rare exomes 8/1,430,232 · genomes 0/152,290 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0023%	43,568
Finnishnot grpmax-eligible	0.00186%	53,876
African / African-American	0.00134%	74,604
European (non-Finnish)	0.000342%	292,364

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: GALNS
Protein: p.Ala482=
Coding: c.1446G>A
MANE Select: NM_000512
dbSNP: rs1468307106
Type: single nucleotide variant
Location: chr16:88818043 (GRCh38)
Gene constraint: LOEUF 1.251 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 96.04 · 2 PDB
Residue 482: an α-helix

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

Disease context

mucopolysaccharidosis type 4A — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Mucopolysaccharidosis type 4 (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood, Infancy
Prevalence: <1 / 1 000 000 (Sweden)

Similar variants

GALNS p.Ala482Val Likely pathogenic ★ ⚠ same residue
GALNS c.1139+1G>A Pathogenic ★★ same condition
GALNS c.121-1G>A Pathogenic ★★ same condition
GALNS c.121-2A>G Pathogenic/Likely pathogenic ★★ same condition
GALNS c.1242+1G>C Pathogenic/Likely pathogenic ★★ same condition
GALNS c.1243-2A>C Likely pathogenic ★★ same condition
GALNS c.1364+1G>A Pathogenic ★★ same condition
GALNS c.1365-1G>C 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/galns-p-ala482 (accessed [today's date]).

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