Is ALS2 p.Tyr1198= (c.3594C>T) pathogenic?

ALS2 p.Tyr1198= (c.3594C>T) is classified Likely benign in ALS2 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2024-12-15). Very rare (popmax 0.00988%, sas); Associated with infantile-onset ascending hereditary spastic paralysis.

What condition is associated with ALS2 p.Tyr1198= (c.3594C>T)?

ALS2 p.Tyr1198= (c.3594C>T) is associated with infantile-onset ascending hereditary spastic paralysis (ClinVar).

How common is ALS2 p.Tyr1198= (c.3594C>T) in the general population?

ALS2 p.Tyr1198= (c.3594C>T) is very rare (popmax 0.00988%, sas) (gnomAD).

ALS2 p.Tyr1198=

Q: How is Infantile-onset ascending hereditary spastic paralysis inherited?

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

c.3594C>T · rs781454879 · VCV1013447

Likely benign Multiple submitters

Classification

Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

gnomAD v4.1

Rare

very rare (popmax 0.00988%, sas)

Conditions

infantile-onset ascending hereditary spastic paralysis

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 0.53	GERP -3.1, phastCons 0.83
Overall
CADD	9.198	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.00988% South Asian · 9/91,056 alleles

Filtering AF 0.00514% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00375%

Overall 0.00248% 40/1,613,620 alleles · very rare

Ancestry group	Frequency	1 in
South Asiangrpmax	0.00988%	10,117
European (non-Finnish)	0.00229%	43,690
Admixed American	0.00167%	60,014
Remaining individualsnot grpmax-eligible	0.0016%	62,496
Finnishnot grpmax-eligible	0.00156%	64,008
African / African-American	0.00133%	74,990

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: ALS2
Protein: p.Tyr1198=
Coding: c.3594C>T
MANE Select: NM_020919
dbSNP: rs781454879
Type: single nucleotide variant
Location: chr2:201723360 (GRCh38)
Gene constraint: LOEUF 0.649 · pLI <0.01 · ClinGen HI gene assoc. with recessive phenotype (gnomAD)
Structure: AlphaFold pLDDT 74.69

Full ALS2 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

infantile-onset ascending hereditary spastic paralysis — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Infantile-onset ascending hereditary spastic paralysis (Orphanet):

Inheritance: Autosomal recessive
Onset: Infancy, Neonatal

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ALS2 p.Ala573Glu Likely pathogenic ★★ same condition
ALS2 p.Arg1139Ter Pathogenic/Likely pathogenic ★★ same condition
ALS2 p.Arg1421Ter Pathogenic/Likely pathogenic ★★ same condition
ALS2 p.Arg1461Ter Pathogenic ★★ same condition
ALS2 p.Arg1510Ter 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/als2-p-tyr1198 (accessed [today's date]).

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