rs398123102

Positions:

• chrX-153740156-G-A

Variant summary

Our verdict is Pathogenic. Variant got 14 ACMG points: 14P and 0B. PM2 PP3_Strong PP5_Very_Strong

The NM_000033.4(ABCD1):​c.1553G>A​(p.Arg518Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000912 in 1,096,719 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Pathogenic (★★).

• Frequency:
  • Genomes: not found (cov: 24)
  • Exomes 𝑓: 9.1e-7 (0 hom. 0 hem.)
• Consequence: ABCD1 NM_000033.4 missense
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:13
• Conservation: PhyloP100: 10.0

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]

ABCD1 (HGNC:):

ACMG classification

Verdict is Pathogenic. Variant got 14 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.994
• PP5: Variant X-153740156-G-A is Pathogenic according to our data. Variant chrX-153740156-G-A is described in ClinVar as [Pathogenic]. Clinvar id is 92317.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chrX-153740156-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ABCD1	NM_000033.4	c.1553G>A	p.Arg518Gln	missense_variant	6/10	ENST00000218104.6	NP_000024.2
ABCD1	XM_047441916.1	c.1853G>A	p.Arg618Gln	missense_variant	7/11		XP_047297872.1
ABCD1	XM_047441917.1	c.1609G>A	p.Gly537Arg	missense_variant	7/8		XP_047297873.1
LOC124905226	XR_007068350.1	n.1392C>T		non_coding_transcript_exon_variant	1/2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ABCD1	ENST00000218104.6	c.1553G>A	p.Arg518Gln	missense_variant	6/10	1	NM_000033.4	ENSP00000218104.3
ABCD1	ENST00000443684.2	n.556G>A		non_coding_transcript_exon_variant	5/6	3
PLXNB3-AS1	ENST00000434284.1	n.72-1578C>T		intron_variant		3

Frequencies

GnomAD3 genomes Cov.: 24

GnomAD3 exomes AF: 0.00000548 AC: 1 AN: 182400 Hom.: 0 AF XY: 0.00 AC XY: 0 AN XY: 66952

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000123

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 9.12e-7 AC: 1 AN: 1096719 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 362213

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000119

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 24

ExAC AF: 0.00000824 AC: 1

EpiCase AF: 0.00

EpiControl AF: 0.0000594

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:13

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Adrenoleukodystrophy Pathogenic:7

Pathogenic, criteria provided, single submitter	clinical testing	Juno Genomics, Hangzhou Juno Genomics, Inc	-	PM2_Supporting+PS4+PM6+PP4+PM5 -
Pathogenic, criteria provided, single submitter	clinical testing	Molecular Diagnostics Laboratory, M Health Fairview: University of Minnesota	Apr 26, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	May 24, 2022	- -
Pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Nov 07, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Apr 16, 2020	Variant summary: ABCD1 c.1553G>A (p.Arg518Gln) results in a conservative amino acid change located in the AAA+ ATPase domain (IPR003593) of the encoded protein sequence. Four of five in-silico tools predict a damaging effect of the variant on protein function. The variant allele was found at a frequency of 5.5e-06 in 182500 control chromosomes (gnomAD). The variant c.1553G>A (also known as 1939G>A) has been reported in the literature in numerous individuals affected with Adrenoleukodystrophy (e.g. Imamura_1997, Takano_1999, Dvorakova_2001, Guimaraes_2002, Pan_2005, Coll_2005, Wiens_2019), and in several cases the lack of ALD protein in patient derived fibroblasts was demonstrated (e.g. Imamura_1997, Guimaraes_2002, Coll_2005). These data indicate that the variant is very likely to be associated with disease. Two clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014, and both of them classified 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	Jan 20, 2024	This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 518 of the ABCD1 protein (p.Arg518Gln). This variant is present in population databases (rs398123102, gnomAD 0.001%). This missense change has been observed in individual(s) with ABCD1-related conditions (PMID: 10190819, 12175782, 15811009, 16087056, 21068741, 21700483, 22479560, 23419472, 23566833, 26260157). In at least one individual the variant was observed to be de novo. This variant is also known as c.1939G>A. ClinVar contains an entry for this variant (Variation ID: 92317). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is expected to disrupt ABCD1 protein function with a positive predictive value of 95%. This variant disrupts the p.Arg518 amino acid residue in ABCD1. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 14767898, 16415970). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center	May 12, 2023	- -

not provided Pathogenic:5

Pathogenic, criteria provided, single submitter	clinical testing	CeGaT Center for Human Genetics Tuebingen	Nov 01, 2022	ABCD1: PM1, PM2, PS4:Moderate, PM5:Supporting, PP3, PP4, PS3:Supporting -
Pathogenic, criteria provided, single submitter	clinical testing	Eurofins Ntd Llc (ga)	Oct 08, 2012	- -
Pathogenic, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Jul 20, 2022	- -
Pathogenic, criteria provided, single submitter	clinical testing	GeneDx	May 22, 2024	Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; This variant is associated with the following publications: (PMID: 16996397, 25920484, 12175782, 23566833, 33920672, 30968598, 34826210, 21068741, 16415970, 20661612, 16087056, 27766264, 26260157, 11438993, 15811009, 23346902, 10190819, 27991992, 31074578, 32798492, 23419472, 24719486, 22479560, 15642351) -
Pathogenic, criteria provided, single submitter	clinical testing	Institute of Medical Genetics and Applied Genomics, University Hospital Tübingen	Oct 23, 2020	- -

ABCD1-related disorder Pathogenic:1

Pathogenic, no assertion criteria provided

clinical testing

PreventionGenetics, part of Exact Sciences

May 29, 2024

The ABCD1 c.1553G>A variant is predicted to result in the amino acid substitution p.Arg518Gln. This variant has been reported in multiple individuals with X-linked adrenoleukodystrophy (see for example, Table 3, Ping et al. 2006. PubMed ID: 16415970; Table 1, Coll et al. 2005. PubMed ID: 15811009; Table 2, Matsukawa et al. 2011. PubMed ID: 20661612). This variant is reported in 0.0012% of alleles in individuals of European (non-Finnish) descent in gnomAD. Alternate missense variants affecting the same amino acid (p.Arg518Trp and p.Arg518Gly) have been reported to be causative for X-linked adrenoleukodystrophy (Table 3, Ping et al. 2006. PubMed ID: 16415970; Table 2, Matsukawa et al. 2011. PubMed ID: 20661612). This variant is interpreted as pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.94
BayesDel_addAF	Pathogenic	0.68	D
BayesDel_noAF	Pathogenic	0.74
CADD	Pathogenic	30
DANN	Pathogenic	1.0
DEOGEN2	Pathogenic	0.96	D
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.99	D
M_CAP	Pathogenic	0.87	D
MetaRNN	Pathogenic	0.99	D
MetaSVM	Pathogenic	0.93	D
MutationAssessor	Uncertain	2.2	M
PrimateAI	Uncertain	0.60	T
PROVEAN	Uncertain	-3.6	D
REVEL	Pathogenic	0.94
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.81
MutPred		0.97		Gain of methylation at K513 (P = 0.0396);
MVP		1.0
MPC		1.6
ClinPred		0.95	D
GERP RS		4.9
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.90
gMVP		0.92

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs398123102; hg19: chrX-153005610;