16-2295663-C-T

Variant names:

Variant summary

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

The NM_001089.3(ABCA3):c.2341G>A(p.Val781Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000266 in 1,613,928 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000027 ( 0 hom. )

Consequence

ABCA3
NM_001089.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 1.41

Variant links:

Genes affected

ABCA3 (HGNC:33): (ATP binding cassette subfamily A member 3) The membrane-associated 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 intracellular membranes. ABC genes are divided into seven distinct subfamilies (ABC1, MDR/TAP, MRP, ALD, OABP, GCN20, White). This protein is a member of the ABC1 subfamily. Members of the ABC1 subfamily comprise the only major ABC subfamily found exclusively in multicellular eukaryotes. The full transporter encoded by this gene may be involved in development of resistance to xenobiotics and engulfment during programmed cell death. [provided by RefSeq, Jul 2008]

ABCA3 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
ABCA3	NM_001089.3 link	c.2341G>A	p.Val781Met	missense_variant	Exon 18 of 33	ENST00000301732.10	NP_001080.2	Q99758-1Q4LE27

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
ABCA3	ENST00000301732.10 link	c.2341G>A	p.Val781Met	missense_variant	Exon 18 of 33	1	NM_001089.3	ENSP00000301732.5	Q99758-1
ABCA3	ENST00000382381.7 link	c.2167G>A	p.Val723Met	missense_variant	Exon 17 of 32	1		ENSP00000371818.3	H0Y3H2
ABCA3	ENST00000563623.5 link	n.2904G>A		non_coding_transcript_exon_variant	Exon 18 of 20	1

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152238

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000192

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000199

AC:

AN:

251164

Hom.:

AF XY:

0.00000736

AC XY:

AN XY:

135792

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000109

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000264

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000274

AC:

AN:

1461690

Hom.:

Cov.:

AF XY:

0.0000220

AC XY:

AN XY:

727166

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.000176

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000288

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152238

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74382

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000192

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000294

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000422

Hom.:

Bravo

AF:

0.0000189

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Interstitial lung disease due to ABCA3 deficiency

Uncertain:2

Feb 22, 2019

Johns Hopkins Genomics, Johns Hopkins University

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This ABCA3 variant (rs771821923) is rare in large population datasets (gnomAD: 5/251164 total alleles; 0.002%; no homozygotes). This variant has not been reported in the literature, to our knowledge. A single submitter in ClinVar classifies this as a variant of uncertain clinical significance (Variation ID: 318487). Of two bioinformatics tools queried, one predicts that the substitution would be possibly damaging, while the second predicts that it would be damaging. The valine residue at this position is not highly evolutionarily conserved across the species assessed. Bioinformatic analysis predicts that this variant would not affect normal exon 18 splicing, although this has not been confirmed experimentally to our knowledge. The clinical significance of c.2341G>A is uncertain at this time. -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Hereditary pulmonary alveolar proteinosis

Uncertain:1

Aug 22, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.2341G>A (p.V781M) alteration is located in exon 18 (coding exon 15) of the ABCA3 gene. This alteration results from a G to A substitution at nucleotide position 2341, causing the valine (V) at amino acid position 781 to be replaced by a methionine (M). 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

Uncertain

0.41

BayesDel_addAF

Benign

-0.16

BayesDel_noAF

Benign

-0.23

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.67

D;.

Eigen

Benign

-0.29

Eigen_PC

Benign

-0.52

FATHMM_MKL

Benign

0.60

LIST_S2

Uncertain

0.94

D;D

M_CAP

Uncertain

0.16

MetaRNN

Uncertain

0.51

D;D

MetaSVM

Uncertain

0.68

MutationAssessor

Uncertain

2.0

M;.

PrimateAI

Benign

0.32

PROVEAN

Benign

-2.2

N;N

REVEL

Uncertain

0.40

Sift

Uncertain

0.0030

D;D

Sift4G

Uncertain

0.0040

D;D

Polyphen

0.98

D;.

Vest4

0.65

MutPred

0.34

Gain of catalytic residue at V777 (P = 0.0172);.;

MVP

0.65

MPC

0.65

ClinPred

0.39

GERP RS

-4.6

Varity_R

0.095

gMVP

0.73

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over