Is ABCD1 p.Ala170Val (c.509C>T) pathogenic?

ABCD1 p.Ala170Val (c.509C>T) is classified Uncertain significance in ABCD1 (ClinVar, Single submitter, 2 submitters; last evaluated 2023-12-23). AlphaMissense: likely pathogenic (0.6219); Absent from gnomAD v4.1; Associated with adrenoleukodystrophy.

What condition is associated with ABCD1 p.Ala170Val (c.509C>T)?

ABCD1 p.Ala170Val (c.509C>T) is associated with adrenoleukodystrophy (ClinVar).

How common is ABCD1 p.Ala170Val (c.509C>T) in the general population?

ABCD1 p.Ala170Val (c.509C>T) is absent from gnomAD v4.1 (gnomAD).

How is X-linked adrenoleukodystrophy inherited?

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

What do computational predictors say about ABCD1 p.Ala170Val (c.509C>T)?

AlphaMissense predicts likely pathogenic (score 0.6219) — an in-silico prediction, not a clinical call.

ABCD1 p.Ala170Val

c.509C>T · rs2522266123 · VCV2631237

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

AlphaMissense

likely pathogenic

0.6219 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

2/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

adrenoleukodystrophy

Computational evidence

Protein change
AlphaMissense	0.6219	likely pathogenic
REVEL	0.773	moderately pathogenic-leaning
SaProt	LLR -6.93	tolerated
⇒ AlphaMissense and REVEL call this damaging; SaProt does not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4.9	GERP 1.7, phastCons 1
Regional constraint	o/e 0.94	unconstrained · MANE · 865 bp · p 0.3 · regional, not allelic
Overall
CADD	26.2	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: ABCD1
Protein: p.Ala170Val
Coding: c.509C>T
MANE Select: NM_000033
dbSNP: rs2522266123
Type: single nucleotide variant
Location: chrX:153725775 (GRCh38)
Structure: AlphaFold pLDDT 81.58 · 14 PDB
Residue 170: an α-helix; the abc transmembrane type-1 domain; the 'interaction with pex19' region

Full ABCD1 gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Disease context

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

For X-linked adrenoleukodystrophy (Orphanet):

Inheritance: X-linked dominant
Onset: Adolescent, Adult, Childhood, Elderly
Prevalence: 1-9 / 1 000 000 (Israel)

Similar variants

ABCD1 p.Ala170Asp Likely pathogenic ★ same residue
ABCD1 p.Ala170Gly Uncertain significance ★ ⚠ same residue
ABCD1 p.Ala170Thr Conflicting classifications of pathogenicity ★ ⚠ same residue
ABCD1 c.1635-2A>G Pathogenic ★★ same condition
ABCD1 c.1781-1G>C Pathogenic ★★ same condition
ABCD1 c.1781-1G>T Pathogenic/Likely pathogenic ★★ same condition
ABCD1 c.1866-10G>A Pathogenic/Likely pathogenic ★★ same condition
ABCD1 c.1866-1G>C 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/abcd1-p-ala170val (accessed [today's date]).

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