Is ARSA p.Tyr308= (c.924C>T) pathogenic?

ARSA p.Tyr308= (c.924C>T) is classified Likely benign in ARSA (ClinVar, Multiple submitters, 2 submitters; last evaluated 2025-06-09). Very rare (popmax 0.00801%, afr); Associated with metachromatic leukodystrophy.

What condition is associated with ARSA p.Tyr308= (c.924C>T)?

ARSA p.Tyr308= (c.924C>T) is associated with metachromatic leukodystrophy (ClinVar).

How common is ARSA p.Tyr308= (c.924C>T) in the general population?

ARSA p.Tyr308= (c.924C>T) is very rare (popmax 0.00801%, afr) (gnomAD).

How is Metachromatic leukodystrophy inherited?

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

ARSA p.Tyr308=

c.924C>T · rs753927253 · VCV1087279

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00801%, afr)

Conditions

metachromatic leukodystrophy

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 -2	GERP -4
Overall
CADD	2.786	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00801% African / African-American · 6/74,920 alleles

Filtering AF 0.00347% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00229%

Overall 0.000744% 12/1,612,722 alleles · very rare

Ancestry group	Frequency	1 in
African / African-Americangrpmax	0.00801%	12,487
East Asian	0.00446%	22,417
Admixed American	0.00167%	59,844
Remaining individualsnot grpmax-eligible	0.0016%	62,428
Finnishnot grpmax-eligible	0.00157%	63,630
European (non-Finnish)	8.48e-05%	1,179,714

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: ARSA
Protein: p.Tyr308=
Coding: c.924C>T
MANE Select: NM_000487
dbSNP: rs753927253
Type: single nucleotide variant
Location: chr22:50626209 (GRCh38)
Gene constraint: LOEUF 1.166 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 96.43 · 10 PDB
Residue 308: an α-helix; a disulfide bond; a UniProt-annotated variant site (in mld; late-infantile form); a UniProt-annotated variant site (in mld; late-infantile form; no enzyme residual activity)

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

Disease context

metachromatic leukodystrophy — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Metachromatic leukodystrophy (Orphanet):

Inheritance: Autosomal recessive
Onset: Adolescent, Adult, Childhood, Infancy
Prevalence: 1-9 / 100 000 (Europe)

Similar variants

ARSA p.Tyr308His Pathogenic ★★ same residue
ARSA p.Tyr308Cys Uncertain significance ★ same residue
ARSA c.1107+1G>A Pathogenic/Likely pathogenic ★★ same condition
ARSA c.1107+1G>T Pathogenic ★★ same condition
ARSA c.1108-2A>G Pathogenic ★★ same condition
ARSA c.1108-3C>G Pathogenic/Likely pathogenic ★★ same condition
ARSA c.1210+1G>A Pathogenic ★★ same condition
ARSA c.224+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/arsa-p-tyr308 (accessed [today's date]).

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