X-153725795-C-T

Position:

• chrX-153725795-C-T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000033.4(ABCD1):​c.529C>T​(p.Gln177Ter) variant causes a stop gained change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★). Synonymous variant affecting the same amino acid position (i.e. Q177Q) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 26)
• Consequence: ABCD1 NM_000033.4 stop_gained
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:6
• Conservation: PhyloP100: 0.473

Genes affected

ABCD1 (HGNC:61): (ATP binding cassette subfamily D member 1) The protein encoded by this gene is a member of the superfamily of ATP-binding cassette (ABC) transporters. ABC proteins transport various molecules across extra- and intra-cellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the ALD subfamily, which is involved in peroxisomal import of fatty acids and/or fatty acyl-CoAs in the organelle. All known peroxisomal ABC transporters are half transporters which require a partner half transporter molecule to form a functional homodimeric or heterodimeric transporter. This peroxisomal membrane protein is likely involved in the peroxisomal transport or catabolism of very long chain fatty acids. Defects in this gene have been identified as the underlying cause of adrenoleukodystrophy, an X-chromosome recessively inherited demyelinating disorder of the nervous system. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-153725795-C-T is Pathogenic according to our data. Variant chrX-153725795-C-T is described in ClinVar as [Pathogenic]. Clinvar id is 369726.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chrX-153725795-C-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ABCD1	NM_000033.4	c.529C>T	p.Gln177Ter	stop_gained	1/10	ENST00000218104.6
ABCD1	XM_047441916.1	c.529C>T	p.Gln177Ter	stop_gained	1/11
ABCD1	XM_047441917.1	c.529C>T	p.Gln177Ter	stop_gained	1/8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ABCD1	ENST00000218104.6	c.529C>T	p.Gln177Ter	stop_gained	1/10	1	NM_000033.4	P1
ABCD1	ENST00000370129.4			upstream_gene_variant		2

Frequencies

GnomAD3 genomes Cov.: 26

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 26

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:6

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Adrenoleukodystrophy Pathogenic:5

Pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Nov 07, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Mar 08, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center	Sep 22, 2024	- -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jan 25, 2021	Variant summary: ABCD1 c.529C>T (p.Gln177X) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant was absent in 182774 control chromosomes (gnomAD). c.529C>T has been reported in the literature in individuals affected with Adrenoleukodystrophy (e.g. Lachtenmacher_2000, Asheuer_2005, Coll_2005, Lan_2011). These data indicate that the variant is likely to be associated with disease. Experimental evidence indicates that patient fibroblasts with the variant fail to express detectable levels of ALDP protein (e.g. Coll_2005). One clinical diagnostic laboratory has submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation and cited the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	May 30, 2021	For these reasons, this variant has been classified as Pathogenic. This variant has been observed in individual(s) with ABCD1-related conditions (PMID: 10737980, 24480483). ClinVar contains an entry for this variant (Variation ID: 369726). This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Gln177*) in the ABCD1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in ABCD1 are known to be pathogenic (PMID: 11748843). -

not provided Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Eurofins Ntd Llc (ga)

Jun 29, 2016

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.74	D
BayesDel_noAF	Pathogenic	0.28
CADD	Pathogenic	35
DANN	Uncertain	1.0
FATHMM_MKL	Benign	0.13	N
MutationTaster	Benign	1.0	A
Vest4		0.61
GERP RS		4.5

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.0		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1057516052; hg19: chrX-152991250;