NM_000033.4:c.823C>T

Variant names:

• chrX-153726089-C-T
• rs782083931
• NM_000033.4:c.823C>T

Variant summary

Our verdict is Likely pathogenic. The variant received 7 ACMG points: 7P and 0B. PM1 PM2 PM5 PP5

The NM_000033.4(ABCD1):​c.823C>T​(p.Arg275Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000373 in 1,071,770 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R275Q) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 26)
  • Exomes 𝑓: 0.0000037 (0 hom. 1 hem.)
• Consequence: ABCD1 NM_000033.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:6 U:3
• Conservation: PhyloP100: 0.258
• Publications: 1 publications found

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]

BCAP31 (HGNC:16695): (B cell receptor associated protein 31) This gene encodes a member of the B-cell receptor associated protein 31 superfamily. The encoded protein is a multi-pass transmembrane protein of the endoplasmic reticulum that is involved in the anterograde transport of membrane proteins from the endoplasmic reticulum to the Golgi and in caspase 8-mediated apoptosis. Microdeletions in this gene are associated with contiguous ABCD1/DXS1375E deletion syndrome (CADDS), a neonatal disorder. Alternative splicing of this gene results in multiple transcript variants. Two related pseudogenes have been identified on chromosome 16. [provided by RefSeq, Jan 2012]

BCAP31 Gene-Disease associations (from GenCC):

• severe motor and intellectual disabilities-sensorineural deafness-dystonia syndrome

  Inheritance: AR, XL Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Orphanet, ClinGen, G2P, Labcorp Genetics (formerly Invitae)

ACMG classification

Our verdict: Likely_pathogenic. The variant received 7 ACMG points.

• PM1: In a hotspot region, there are 13 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 1 benign, 15 uncertain in NM_000033.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrX-153726090-G-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 2732781.Status of the report is criteria_provided_single_submitter, 1 stars.
• PP5: Variant X-153726089-C-T is Pathogenic according to our data. Variant chrX-153726089-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 384589.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000033.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ABCD1	NM_000033.4	MANE Select	c.823C>T	p.Arg275Trp	missense	Exon 1 of 10	NP_000024.2
	ABCD1	NM_001440747.1		c.823C>T	p.Arg275Trp	missense	Exon 1 of 11	NP_001427676.1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	ABCD1	ENST00000218104.6	TSL:1 MANE Select	c.823C>T	p.Arg275Trp	missense	Exon 1 of 10	ENSP00000218104.3	P33897
	ABCD1	ENST00000862307.1		c.823C>T	p.Arg275Trp	missense	Exon 1 of 11	ENSP00000532366.1
	ABCD1	ENST00000862306.1		c.823C>T	p.Arg275Trp	missense	Exon 1 of 11	ENSP00000532365.1

Frequencies

GnomAD3 genomes Cov.: 26

GnomAD2 exomes AF: 0.00000740 AC: 1 AN: 135103 AF XY: 0.0000274

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 FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000179

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000373 AC: 4 AN: 1071770 Hom.: 0 Cov.: 32 AF XY: 0.00000290 AC XY: 1 AN XY: 344666

African (AFR) AF: 0.0000387 AC: 1 AN: 25870

American (AMR) AF: 0.00 AC: 0 AN: 32264

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 18334

East Asian (EAS) AF: 0.00 AC: 0 AN: 29112

South Asian (SAS) AF: 0.00 AC: 0 AN: 50464

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 38098

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4062

European-Non Finnish (NFE) AF: 0.00000362 AC: 3 AN: 828553

Other (OTH) AF: 0.00 AC: 0 AN: 45013

GnomAD4 genome Cov.: 26

ExAC AF: 0.0000335 AC: 4

ClinVar

ClinVar submissions

Significance: Conflicting classifications of pathogenicity

Revision: criteria provided, conflicting classifications

Pathogenic	VUS	Benign	Condition
4	-	-	Adrenoleukodystrophy (4)
2	-	-	not provided (2)
-	1	-	ABCD1-related disorder (1)
-	1	-	Inborn genetic diseases (1)
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.35
BayesDel_addAF	Pathogenic	0.58	D
BayesDel_noAF	Pathogenic	0.60
CADD	Uncertain	24
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	1.0	D
FATHMM_MKL	Benign	0.45	N
LIST_S2	Pathogenic	1.0	D
M_CAP	Pathogenic	0.84	D
MetaRNN	Uncertain	0.73	D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Uncertain	2.7	M
PhyloP100		0.26
PrimateAI	Uncertain	0.79	T
PROVEAN	Pathogenic	-6.6	D
REVEL	Pathogenic	0.84
Sift	Uncertain	0.020	D
Sift4G	Uncertain	0.024	D
Polyphen		1.0	D
Vest4		0.47
MutPred		0.56		Loss of disorder (P = 0.0053)
MVP		1.0
MPC		1.6
ClinPred		0.92	D
GERP RS		0.77
PromoterAI		-0.073	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.89
gMVP		0.96
Mutation Taster		=9/91	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs782083931; hg19: chrX-152991544;