Is ATL1 p.Ser306Arg (c.918T>G) pathogenic?

ATL1 p.Ser306Arg (c.918T>G) is classified Uncertain significance in ATL1 (ClinVar, Single submitter, 1 submitter; last evaluated 2020-03-06). AlphaMissense: ambiguous (0.4009); Absent from gnomAD v4.1; Associated with hereditary spastic paraplegia 3A.

What condition is associated with ATL1 p.Ser306Arg (c.918T>G)?

ATL1 p.Ser306Arg (c.918T>G) is associated with hereditary spastic paraplegia 3A (ClinVar).

How common is ATL1 p.Ser306Arg (c.918T>G) in the general population?

ATL1 p.Ser306Arg (c.918T>G) is absent from gnomAD v4.1 (gnomAD).

How is Autosomal dominant spastic paraplegia type 3 inherited?

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

What do computational predictors say about ATL1 p.Ser306Arg (c.918T>G)?

AlphaMissense predicts ambiguous (score 0.4009) — an in-silico prediction, not a clinical call.

ATL1 p.Ser306Arg

c.918T>G · rs2039458848 · VCV845270

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

ambiguous

0.4009 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

0/2 damaging

REVEL, SaProt · AlphaMissense no call

Conditions

hereditary spastic paraplegia 3A

Computational evidence

Protein change
AlphaMissense	0.4009	ambiguous
REVEL	0.064	moderately benign-leaning
SaProt	LLR -9.87	tolerated
⇒ REVEL and SaProt both call this tolerated; AlphaMissense makes no call.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 0.76	GERP 0.65, phastCons 1
Regional constraint	o/e 0.84	unconstrained · MANE · 7,372 bp · p 0.19 · regional, not allelic
Overall
CADD	22.3	PHRED · no single calibrated threshold — expert panels disagree

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

Population frequency

gnomAD v4.1 · exomes + genomes

Absent from gnomAD v4.1. Not observed in any sequenced alleles — a rarity signal (ACMG PM2-supporting), not evidence of pathogenicity on its own.

Variant & gene context

Gene: ATL1
Protein: p.Ser306Arg
Coding: c.918T>G
MANE Select: NM_015915
dbSNP: rs2039458848
Type: single nucleotide variant
Location: chr14:50620654 (GRCh38)
Gene constraint: LOEUF 0.57 · pLI 0.36 · ClinGen HI 0/3 (gnomAD)
Structure: AlphaFold pLDDT 86.49 · 14 PDB
Residue 306: the gb1/rhd3-type g domain

Full ATL1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

hereditary spastic paraplegia 3A — disease report on Sugi Atlas → Associated genes, phenotypes, clinical trials & treatments

For Autosomal dominant spastic paraplegia type 3 (Orphanet):

Inheritance: Autosomal dominant
Onset: Adult, Childhood
Prevalence: 1-9 / 1 000 000 (Portugal)

Similar variants

ATL1 p.Ser306Gly Uncertain significance ★ ⚠ same residue
ATL1 p.Arg217Gln Pathogenic/Likely pathogenic ★★ same condition
ATL1 p.Arg239Cys Pathogenic/Likely pathogenic ★★ same condition
ATL1 p.Arg239His Likely pathogenic ★★ same condition
ATL1 p.Arg403Pro Likely pathogenic ★★ same condition
ATL1 p.Arg415Trp Pathogenic/Likely pathogenic ★★ ⚠ same condition
ATL1 p.Arg416Cys Pathogenic/Likely pathogenic ★★ ⚠ same condition
ATL1 p.Arg495Trp 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/atl1-p-ser306arg (accessed [today's date]).

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