Is ABCD1 p.Ala223Asp (c.668C>A) pathogenic?

ABCD1 p.Ala223Asp (c.668C>A) is classified Likely pathogenic in ABCD1 (ClinVar, Single submitter, 2 submitters; last evaluated 2025-01-18). AlphaMissense: likely pathogenic (0.966); Absent from gnomAD v4.1; Associated with adrenoleukodystrophy.

What condition is associated with ABCD1 p.Ala223Asp (c.668C>A)?

ABCD1 p.Ala223Asp (c.668C>A) is associated with adrenoleukodystrophy (ClinVar).

How common is ABCD1 p.Ala223Asp (c.668C>A) in the general population?

ABCD1 p.Ala223Asp (c.668C>A) 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.Ala223Asp (c.668C>A)?

AlphaMissense predicts likely pathogenic (score 0.966) — an in-silico prediction, not a clinical call.

ABCD1 p.Ala223Asp

c.668C>A · VCV3724614

Likely pathogenic Single submitter

Classification

Likely pathogenic

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 2 submitters

AlphaMissense

likely pathogenic

0.966 · ACMG-weighted

gnomAD v4.1

Absent

absent from gnomAD v4.1

Missense predictors

3/3 damaging

AlphaMissense, REVEL, SaProt

Conditions

adrenoleukodystrophy

Computational evidence

Protein change
AlphaMissense	0.966	likely pathogenic ✓ concordant with ClinVar
REVEL	0.837	moderately pathogenic-leaning
SaProt	LLR -16.52	damaging
⇒ AlphaMissense, REVEL and SaProt all call this damaging.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP 4	GERP -0.67, phastCons 1
Regional constraint	o/e 0.94	unconstrained · MANE · 865 bp · p 0.3 · regional, not allelic
Overall
CADD	23.5	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.Ala223Asp
Coding: c.668C>A
MANE Select: NM_000033
Type: single nucleotide variant
Location: chrX:153725934 (GRCh38)
Structure: AlphaFold pLDDT 81.58 · 14 PDB
Residue 223: an α-helix; the abc transmembrane type-1 domain

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.Ala223= Likely benign ★★ same residue
ABCD1 p.Ala223Val Likely benign ★ ⚠ 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
ABCD1 c.1866-2A>T 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-ala223asp (accessed [today's date]).

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