NM_000033.4(ABCD1):c.1900G>A (p.Ala634Thr) AND Adrenoleukodystrophy

Germline classification:: Conflicting interpretations of pathogenicity (5 submissions)
Last evaluated:: Dec 30, 2023
Review status:: criteria provided, conflicting classifications

Somatic classification of clinical impact:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Somatic classification of oncogenicity:: None
Review status:: (0/4) 0 stars out of maximum of 4 stars
no assertion criteria provided

Record status:: current
Accession:: RCV000633484.12

Allele description [Variation Report for NM_000033.4(ABCD1):c.1900G>A (p.Ala634Thr)]

NM_000033.4(ABCD1):c.1900G>A (p.Ala634Thr)

Gene:

ABCD1:ATP binding cassette subfamily D member 1 [Gene - OMIM - HGNC]

Variant type:

single nucleotide variant

Cytogenetic location:

Xq28

Genomic location:

Preferred name:

NM_000033.4(ABCD1):c.1900G>A (p.Ala634Thr)

HGVS:

NC_000023.11:g.153743255G>A
NG_009022.2:g.23388G>A
NM_000033.4:c.1900G>AMANE SELECT
NP_000024.2:p.Ala634Thr
LRG_1017t1:c.1900G>A
LRG_1017:g.23388G>A
LRG_1017p1:p.Ala634Thr
NC_000023.10:g.153008709G>A
NM_000033.3:c.1900G>A

Protein change:

A634T

Links:

dbSNP: rs782041940

NCBI 1000 Genomes Browser:

rs782041940

Molecular consequence:

NM_000033.4:c.1900G>A - missense variant - [Sequence Ontology: SO:0001583]

Condition(s)

Name:: Adrenoleukodystrophy (ALD)
Synonyms:: ADDISON DISEASE AND CEREBRAL SCLEROSIS; BRONZE SCHILDER DISEASE; MELANODERMIC LEUKODYSTROPHY; See all synonyms [MedGen]
Identifiers:: MONDO: MONDO:0018544; MedGen: C0162309; OMIM: 300100

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Submission Accession	Submitter	Review Status (Assertion method)	Clinical Significance (Last evaluated)	Origin	Method	Citations
SCV000754717	Labcorp Genetics (formerly Invitae), Labcorp	criteria provided, single submitter (Invitae Variant Classification Sherloc (09022015))	Likely pathogenic (Dec 30, 2023)	germline	clinical testing	PubMed (2) [See all records that cite these PMIDs] 35076462, 28492532
SCV000992324	Johns Hopkins Genomics, Johns Hopkins University	criteria provided, single submitter (ACMG Guidelines, 2015)	Uncertain significance (Mar 28, 2019)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV002045774	Genome-Nilou Lab	criteria provided, single submitter (ACMG Guidelines, 2015)	Uncertain significance (Nov 7, 2021)	germline	clinical testing	PubMed (1) [See all records that cite this PMID]
SCV002084658	Natera, Inc.	no assertion criteria provided	Uncertain significance (Oct 12, 2020)	germline	clinical testing
SCV002549829	Institute of Human Genetics, University of Leipzig Medical Center	criteria provided, single submitter (ACMG Guidelines, 2015)	Uncertain significance (Jun 20, 2022)	unknown	clinical testing	PubMed (1) [See all records that cite this PMID]

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Summary from all submissions

Ethnicity	Origin	Affected	Individuals	Families	Chromosomes tested	Number Tested	Family history	Method
not provided	germline	no	not provided	not provided	not provided	not provided	not provided	clinical testing
not provided	germline	unknown	not provided	not provided	not provided	not provided	not provided	clinical testing
not provided	unknown	yes	not provided	not provided	not provided	not provided	not provided	clinical testing

Citations

PubMed

Newborn Screening for X-Linked Adrenoleukodystrophy: The Initial Illinois Experience.

Burton BK, Hickey R, Hitchins L, Shively V, Ehrhardt J, Ashbaugh L, Peng Y, Basheeruddin K.

Int J Neonatal Screen. 2022 Jan 17;8(1). doi:pii: 6. 10.3390/ijns8010006.

PubMed [citation]

PMID:: 35076462
PMCID:: PMC8788425

Sherloc: a comprehensive refinement of the ACMG-AMP variant classification criteria.

Nykamp K, Anderson M, Powers M, Garcia J, Herrera B, Ho YY, Kobayashi Y, Patil N, Thusberg J, Westbrook M; Invitae Clinical Genomics Group., Topper S.

Genet Med. 2017 Oct;19(10):1105-1117. doi: 10.1038/gim.2017.37. Epub 2017 May 11. Erratum in: Genet Med. 2020 Jan;22(1):240. doi: 10.1038/s41436-019-0624-9.

PubMed [citation]

PMID:: 28492532
PMCID:: PMC5632818

See all PubMed Citations (3)

Details of each submission

From Labcorp Genetics (formerly Invitae), Labcorp, SCV000754717.4

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (2)

Description

This sequence change replaces alanine, which is neutral and non-polar, with threonine, which is neutral and polar, at codon 634 of the ABCD1 protein (p.Ala634Thr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individuals with adrenoleukodystrophy (PMID: 35076462; external communication). ClinVar contains an entry for this variant (Variation ID: 282253). 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%. In summary, the currently available evidence indicates that the variant is pathogenic, but additional data are needed to prove that conclusively. Therefore, this variant has been classified as Likely Pathogenic.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Johns Hopkins Genomics, Johns Hopkins University, SCV000992324.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

Description

This ABCD1 variant is absent from large population datasets and has not been reported in the literature, to our knowledge. There are conflicting interpretations of the pathogenicity of this variant in ClinVar. One submitter classifies it as likely pathogenic and two as a variant of uncertain clinical significance. Two bioinformatic tools queried predict that this substitution would be damaging, and the alanine residue at this position is highly evolutionarily conserved across all species assessed. Bioinformatic analysis predicts that this variant may create a potential cryptic splice site, however, its effect on splicing has not been studied experimentally to our knowledge. The clinical significance of c.1900G>A is uncertain at this time.

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Genome-Nilou Lab, SCV002045774.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	no	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Natera, Inc., SCV002084658.1

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	not provided

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	germline	unknown	not provided	not provided	not provided		not provided	not provided	not provided	not provided

From Institute of Human Genetics, University of Leipzig Medical Center, SCV002549829.2

#	Ethnicity	Individuals	Chromosomes Tested	Family History	Method	Citations
1	not provided	not provided	not provided	not provided	clinical testing	PubMed (1)

Description

Criteria applied: PS4_MOD, PM2_SUP, PP3

#	Sample				Method		Observation
#	Origin	Affected	Number tested	Tissue	Purpose	Method	Individuals	Allele frequency	Families	Co-occurrences
1	unknown	yes	not provided	not provided	not provided		not provided	not provided	not provided	not provided

Last Updated: Oct 13, 2024

ClinVar

Relating variation to medicine