rs751287778

chr13-51961831-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3PP5

The NM_000053.4(ATP7B):c.1946+6T>C variant causes a splice donor region, intron change. The variant allele was found at a frequency of 0.0000031 in 1,612,676 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000027 ( 0 hom. )

Consequence

ATP7B
NM_000053.4 splice_donor_region, intron

Scores

Splicing: ADA: 0.9989

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:6U:1

Conservation

PhyloP100: 5.14

Variant links:

Genes affected

ATP7B (HGNC:870): (ATPase copper transporting beta) This gene is a member of the P-type cation transport ATPase family and encodes a protein with several membrane-spanning domains, an ATPase consensus sequence, a hinge domain, a phosphorylation site, and at least 2 putative copper-binding sites. This protein is a monomer, and functions as a copper-transporting ATPase which exports copper out of the cells, such as the efflux of hepatic copper into the bile. Alternate transcriptional splice variants, encoding different isoforms with distinct cellular localizations, have been characterized. Mutations in this gene have been associated with Wilson disease which is characterized by copper accumulation. [provided by RefSeq, Dec 2019]

ATP7B links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

Splicing scoreres supports a deletorius effect: Scorers claiming Pathogenic: dbscSNV1_ADA, dbscSNV1_RF. No scorers claiming Uncertain. No scorers claiming Benign.

PP5

Variant 13-51961831-A-G is Pathogenic according to our data. Variant chr13-51961831-A-G is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 495403.We mark this variant Likely_pathogenic, oryginal submissions are: {Likely_pathogenic=2, Pathogenic=3, Uncertain_significance=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ATP7B	NM_000053.4 linkuse as main transcript	c.1946+6T>C		splice_donor_region_variant, intron_variant		ENST00000242839.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ATP7B	ENST00000242839.10 linkuse as main transcript	c.1946+6T>C		splice_donor_region_variant, intron_variant		1	NM_000053.4	P1	P35670-1

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

152080

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:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000401

AC:

AN:

249578

Hom.:

AF XY:

0.00000739

AC XY:

AN XY:

135406

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000883

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000274

AC:

AN:

1460596

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

726684

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000360

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.00000658

AC:

AN:

152080

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

74286

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000329

Hom.:

Bravo

AF:

0.0000113

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:6Uncertain:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

Wilson disease

Pathogenic:5Uncertain:1

Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Dec 30, 2023	This sequence change falls in intron 6 of the ATP7B gene. It does not directly change the encoded amino acid sequence of the ATP7B protein. RNA analysis indicates that this variant induces altered splicing and likely results in a shortened protein product. This variant is not present in population databases (gnomAD no frequency). This variant has been observed in individual(s) with Wilson disease (PMID: 22019423). ClinVar contains an entry for this variant (Variation ID: 495403). Variants that disrupt the consensus splice site are a relatively common cause of aberrant splicing (PMID: 17576681, 9536098). Studies have shown that this variant results in skipping of exons 6-8, but is expected to preserve the integrity of the reading-frame (PMID: 22019423). For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Nov 20, 2023	This variant causes a T to C nucleotide substitution at the +6 position of intron 6 of the ATP7B gene. This variant has been observed in individuals affected with autosomal recessive Wilson disease (PMID: 22019423, 22677543, 34400371). One of these individuals has been reported to be homozygous for this variant (PMID: 22019423). An RNA study using cells derived from the homozygous individual has shown that the mutant allele does not lead to the production of full-length transcript but produces an aberrant transcript lacking exons 6, 7, and 8 (PMID: 22019423). This aberrant transcript has also been seen in heterozygous and wild-type samples (PMID: 7726170, 7833924, 9307043, 22019423) and is expected to result in an in-frame deletion of amino acid residues a.a. 624-785, which encode transmembrane domains of the ATP7B protein. A 3837 base-pair deletion that spans exon 6 through 8 was reported in an individual affected with Wilson disease who carried a second pathogenic variant in trans, c.3800A>C (p.Asp1267Ala) (PMID: 21707886). Many pathogenic missense substitution variants have been reported in the impacted region of the gene (ClinVar), indicating that the c.1946+6T>C variant disrupts a functionally important part of the ATP7B gene. This variant, c.1946+6T>C, has been identified in 1/249578 chromosomes in the general population by the Genome Aggregation Database (gnomAD). Loss of ATP7B function is a known mechanism of disease (clinicalgenome.org). Based on the available evidence, this variant is classified as Pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Feb 13, 2023	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Nov 28, 2016	Variant summary: The ATP7B c.1946+6T>C variant involves the alteration of a conserved intronic nucleotide. 3/5 splice prediction tools via Alamut suggest potential impact on a normal splicing pattern, which was confirmed by the RNA studies performed on RNA extracted from peripheral lymphoblasts and liver cells from a homozygous pt. Based on the results, c.1946+6T>C leads to an alternative transcript that is lacking exons 6,7,8 (Zappu_MCP_2012). The variant is present in the large control population dataset of ExAC at a very low frequency 0.0000084 (1/120708 chrs tested), which does not exceed the estimated maximal expected allele frequency of a pathogenic variant in ATP7B gene (0.0054). The variant of interest has been reported in affected individuals with clinically and biochemically confirmed dx of WD via published reports. Taken together, this variant is classified as Likely Pathogenic. -
Likely pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Jul 14, 2021	- -
Uncertain significance, criteria provided, single submitter	clinical testing	Counsyl	Apr 05, 2018	- -

not provided

Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Mayo Clinic Laboratories, Mayo Clinic

Nov 29, 2022

PP4, PM2, PM3, PS4_moderate -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.22

Cadd

Uncertain

Dann

Benign

0.96

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.91

SpliceAI score (max)

0.51

Details are displayed if max score is > 0.2

DS_DL_spliceai

0.51

Position offset: 6

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