12-39553926-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_005164.4(ABCD2):c.2209G>A(p.Asp737Asn) variant causes a missense change. The variant allele was found at a frequency of 0.000033 in 1,608,462 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: 𝑓 0.000033 (0 hom., cov: 32)
  • Exomes 𝑓: 0.000033 (0 hom.)
• Consequence: ABCD2 NM_005164.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 5.14

Genes affected

ABCD2 (HGNC:66): (ATP binding cassette subfamily D member 2) 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. The function of this peroxisomal membrane protein is unknown; however this protein is speculated to function as a dimerization partner of ABCD1 and/or other peroxisomal ABC transporters. Mutations in this gene have been observed in patients with adrenoleukodystrophy, a severe demyelinating disease. This gene has been identified as a candidate for a modifier gene, accounting for the extreme variation among adrenoleukodystrophy phenotypes. This gene is also a candidate for a complement group of Zellweger syndrome, a genetically heterogeneous disorder of peroxisomal biogenesis. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.08566257).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ABCD2	NM_005164.4	c.2209G>A	p.Asp737Asn	missense_variant	10/10	ENST00000308666.4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ABCD2	ENST00000308666.4	c.2209G>A	p.Asp737Asn	missense_variant	10/10	1	NM_005164.4	P1

Frequencies

GnomAD3 genomes AF: 0.0000329 AC: 5 AN: 152004 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.0000242

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00316

Gnomad NFE AF: 0.0000294

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.0000652 AC: 16 AN: 245402 Hom.: 0 AF XY: 0.0000527 AC XY: 7 AN XY: 132764

Gnomad AFR exome AF: 0.0000626

Gnomad AMR exome AF: 0.000236

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.000101

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000271

Gnomad OTH exome AF: 0.000168

GnomAD4 exome AF: 0.0000330 AC: 48 AN: 1456340 Hom.: 0 Cov.: 30 AF XY: 0.0000359 AC XY: 26 AN XY: 724356

Gnomad4 AFR exome AF: 0.0000300

Gnomad4 AMR exome AF: 0.000249

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.000140

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000171

Gnomad4 OTH exome AF: 0.0000499

GnomAD4 genome AF: 0.0000329 AC: 5 AN: 152122 Hom.: 0 Cov.: 32 AF XY: 0.0000269 AC XY: 2 AN XY: 74362

Gnomad4 AFR AF: 0.0000241

Gnomad4 AMR AF: 0.0000655

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000294

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000142 Hom.: 0

Bravo AF: 0.0000529

ExAC AF: 0.0000494 AC: 6

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jan 30, 2024

The c.2209G>A (p.D737N) alteration is located in exon 10 (coding exon 10) of the ABCD2 gene. This alteration results from a G to A substitution at nucleotide position 2209, causing the aspartic acid (D) at amino acid position 737 to be replaced by an asparagine (N). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.066
BayesDel_addAF	Benign	-0.25	T
BayesDel_noAF	Benign	-0.30
Cadd	Benign	20
Dann	Uncertain	1.0
DEOGEN2	Benign	0.25	T
Eigen	Benign	-0.32
Eigen_PC	Benign	-0.15
FATHMM_MKL	Uncertain	0.91	D
LIST_S2	Benign	0.69	T
M_CAP	Benign	0.068	D
MetaRNN	Benign	0.086	T
MetaSVM	Uncertain	-0.11	T
MutationAssessor	Benign	0.81	L
MutationTaster	Benign	0.61	N
PrimateAI	Benign	0.38	T
PROVEAN	Benign	-0.34	N
REVEL	Benign	0.19
Sift	Benign	0.14	T
Sift4G	Uncertain	0.017	D
Polyphen		0.0020	B
Vest4		0.13
MVP		0.93
MPC		0.50
ClinPred		0.017	T
GERP RS		4.1
Varity_R		0.094
gMVP		0.37

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: rs541565694; hg19: chr12-39947728;