Is ASPA p.Asn77fs (c.230dup) pathogenic?

ASPA p.Asn77fs (c.230dup) is classified Pathogenic in ASPA (ClinVar, Single submitter, 1 submitter; last evaluated 2020-08-24). Absent from gnomAD; Associated with Canavan disease.

What condition is associated with ASPA p.Asn77fs (c.230dup)?

ASPA p.Asn77fs (c.230dup) is associated with Canavan disease (ClinVar).

How common is ASPA p.Asn77fs (c.230dup) in the general population?

ASPA p.Asn77fs (c.230dup) is absent from gnomAD (gnomAD).

How is Canavan disease inherited?

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

ASPA p.Asn77fs

c.230dup · rs2150741916 · VCV1069303

Pathogenic Single submitter

Classification

Pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

Consequence

frameshift

predicted LoF

gnomAD v4.1

Not reported

no gnomAD frequency available for this variant

Conditions

Canavan disease

Computational evidence

Protein change
Missense predictors do not apply to this variant type; conservation carries the signal.
Consequence	frameshift	predicted loss-of-function
NMD	predicted	premature termination codon in exon 1 of 6
Splicing
SpliceAI	—	not assessed · substitutions only
Constraint at this position
Conservation	phyloP 9.8	GERP 1.9, phastCons 1

Predicted loss-of-function is descriptive, not an applied PVS1 code.

Population frequency

dbSNP / gnomAD

No gnomAD frequency available for this variant. This is missing data, not an absence: the variant may or may not be present in gnomAD. Rarity (ACMG PM2) and BA1/BS1 cannot be assessed for it.

Variant & gene context

Gene: ASPA
Protein: p.Asn77fs
Coding: c.230dup
MANE Select: NM_000049
dbSNP: rs2150741916
Type: Duplication
Location: chr17:3476385 (GRCh38)
Gene constraint: LOEUF 1.098 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 96.14 · 8 PDB
Residue 77: an α-helix

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

Disease context

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

For Canavan disease (Orphanet):

Inheritance: Autosomal recessive
Onset: Childhood, Infancy, Neonatal

Similar variants

ASPA p.Asn77Ser Conflicting classifications of pathogenicity ★ ⚠ same residue
ASPA p.Ala296fs Pathogenic/Likely pathogenic ★★ same condition
ASPA p.Pro50fs Pathogenic/Likely pathogenic ★★ same condition
ASPA p.Val179fs Pathogenic/Likely pathogenic ★★ same condition
ASPA p.Asp104fs Pathogenic ★ same condition
ASPA p.Asp110delinsValTer Pathogenic ★ same condition
ASPA p.Asp266fs Likely pathogenic ★ same condition
ASPA p.Glu178fs 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/aspa-p-asn77fs (accessed [today's date]).

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