Is ALS2 p.Arg285Gly (c.853A>G) pathogenic?

ALS2 p.Arg285Gly (c.853A>G) is classified Uncertain significance in ALS2 (ClinVar, Multiple submitters, 2 submitters; last evaluated 2022-08-09). AlphaMissense: likely benign (0.0617); Ultra-rare (popmax 0.0165%, mid); Associated with hereditary spastic paraplegia.

What condition is associated with ALS2 p.Arg285Gly (c.853A>G)?

ALS2 p.Arg285Gly (c.853A>G) is associated with hereditary spastic paraplegia, infantile-onset ascending hereditary spastic paralysis (ClinVar).

How common is ALS2 p.Arg285Gly (c.853A>G) in the general population?

ALS2 p.Arg285Gly (c.853A>G) is ultra-rare (popmax 0.0165%, mid) (gnomAD).

What do computational predictors say about ALS2 p.Arg285Gly (c.853A>G)?

AlphaMissense predicts likely benign (score 0.0617) — an in-silico prediction, not a clinical call.

ALS2 p.Arg285Gly

c.853A>G · rs778865969 · VCV1344418

Uncertain significance Multiple submitters

Classification

Uncertain significance

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 2 submitters

AlphaMissense

likely benign

0.0617 · ACMG-weighted

gnomAD v4.1

Rare

ultra-rare (popmax 0.0165%, mid)

Missense predictors

0/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

hereditary spastic paraplegia

Computational evidence

Protein change
AlphaMissense	0.0617	likely benign
REVEL	0.037	moderately benign-leaning
SaProt	LLR -6.18	tolerated
⇒ AlphaMissense, REVEL and SaProt all call this tolerated.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.42	GERP 0.71
Regional constraint	o/e 0.88	unconstrained · MANE · 11 kb · p 0.0064 · regional, not allelic
Overall
CADD	9.352	PHRED · no single calibrated threshold — expert panels disagree

ClinVar classifies this uncertain; the computational predictors unanimously lean tolerated — a triage signal, not a reclassification

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

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0165% Middle Eastern · 1/6,062 alleles

Filtering AF 0.00114% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.000971%

Overall 0.00136% 22/1,614,220 alleles · ultra-rare

Ancestry group	Frequency	1 in
Middle Easterngrpmax	0.0165%	6,062
European (non-Finnish)	0.00178%	56,192

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.Arg285Gly
Coding: c.853A>G
MANE Select: NM_020919
dbSNP: rs778865969
Type: single nucleotide variant
Location: chr2:201761141 (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

hereditary spastic paraplegia — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

Also linked: infantile-onset ascending hereditary spastic paralysis

Similar variants

ALS2 c.1640+1G>A Pathogenic/Likely pathogenic ★★ same condition
ALS2 c.2580+2T>C Pathogenic ★★ same condition
ALS2 c.3703-2A>G Pathogenic/Likely pathogenic ★★ same condition
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-arg285gly (accessed [today's date]).

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