Is ABCD1 p.Ile140= (c.420C>A) pathogenic?

ABCD1 p.Ile140= (c.420C>A) is classified Benign/Likely benign in ABCD1 (ClinVar, Multiple submitters, 6 submitters; last evaluated 2026-01-10). Ultra-rare (popmax 0.0176%, sas); Associated with adrenoleukodystrophy.

What condition is associated with ABCD1 p.Ile140= (c.420C>A)?

ABCD1 p.Ile140= (c.420C>A) is associated with adrenoleukodystrophy (ClinVar).

How common is ABCD1 p.Ile140= (c.420C>A) in the general population?

ABCD1 p.Ile140= (c.420C>A) is ultra-rare (popmax 0.0176%, sas) (gnomAD).

How is X-linked adrenoleukodystrophy inherited?

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

ABCD1 p.Ile140=

c.420C>A · rs74315279 · VCV444829

Benign/Likely benign Multiple submitters

Classification

Benign/Likely benign

ClinVar

Review

Multiple submitters ★★☆☆

ClinVar · 6 submitters

gnomAD v4.1

Rare

ultra-rare (popmax 0.0176%, sas)

Conditions

adrenoleukodystrophy

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 -1.6	GERP -3.4
Overall
CADD	7.408	PHRED · no single calibrated threshold — expert panels disagree

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 0.0176% South Asian · 10/56,836 alleles

Filtering AF 0.00976% ClinGen BA1/BS1 input FAF95, joint · FAF99 0.00912%

Overall 0.0102% 123/1,209,973 alleles · ultra-rare exomes 112/1,096,499 · genomes 11/113,474 · joint denominator

Ancestry group	Frequency	1 in
South Asiangrpmax	0.0176%	5,684
European (non-Finnish)	0.0116%	8,607
Admixed American	0.0109%	9,200
Remaining individualsnot grpmax-eligible	0.00841%	11,885

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: ABCD1
Protein: p.Ile140=
Coding: c.420C>A
MANE Select: NM_000033
dbSNP: rs74315279
Type: single nucleotide variant
Location: chrX:153725686 (GRCh38)
Structure: AlphaFold pLDDT 81.58 · 14 PDB
Residue 140: a turn; a UniProt-annotated variant site (in ald; ald-type); 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.Ile140fs Likely pathogenic ★ 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
ABCD1 c.901-1G>A 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-ile140 (accessed [today's date]).

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