rs1557052171

Variant names:

• chrX-153725333-GC-G
• rs1557052171
• NM_000033.4:c.70delC

Variant summary

Our verdict is Pathogenic. Variant got 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_000033.4(ABCD1):​c.70delC​(p.Leu24SerfsTer44) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★).

• Frequency: Genomes: not found (cov: 25)
• Consequence: ABCD1 NM_000033.4 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 2.55

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 12 ACMG points.

• PVS1: Loss of function variant, product does not undergo nonsense mediated mRNA decay. Variant located near the start codon (<100nt), not predicted to undergo nonsense mediated mRNA decay. There are 71 pathogenic variants in the truncated region.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant X-153725333-GC-G is Pathogenic according to our data. Variant chrX-153725333-GC-G is described in ClinVar as [Pathogenic]. Clinvar id is 458648.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABCD1	NM_000033.4	c.70delC	p.Leu24SerfsTer44	frameshift_variant	Exon 1 of 10	ENST00000218104.6	NP_000024.2
ABCD1	XM_047441916.1	c.70delC	p.Leu24SerfsTer44	frameshift_variant	Exon 1 of 11		XP_047297872.1
ABCD1	XM_047441917.1	c.70delC	p.Leu24SerfsTer44	frameshift_variant	Exon 1 of 8		XP_047297873.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
ABCD1	ENST00000218104.6	c.70delC	p.Leu24SerfsTer44	frameshift_variant	Exon 1 of 10	1	NM_000033.4	ENSP00000218104.3

Frequencies

GnomAD3 genomes Cov.: 25

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 25

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Adrenoleukodystrophy Pathogenic:1

Jun 09, 2017

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change deletes 1 nucleotide from exon 1 of the ABCD1 mRNA (c.70delC), causing a frameshift at codon 24. This creates a premature translational stop signal (p.Leu24Serfs*44) and is expected to result in an absent or disrupted protein product. While this particular variant has not been reported in the literature, loss-of-function variants in ABCD1 are known to be pathogenic (PMID: 11748843). For these reasons, this variant has been classified as Pathogenic. -

Computational scores

Source: dbNSFP v4.3

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: rs1557052171; hg19: chrX-152990788;