chr13-51944204-TG-T

Position:

• chr13-51944204-TG-T

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PVS1 PM2 PP5_Very_Strong

The NM_000053.4(ATP7B):​c.3147del​(p.Thr1050HisfsTer71) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000889 in 1,461,868 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Pathogenic (★★). Variant results in nonsense mediated mRNA decay.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000089 (0 hom.)
• Consequence: ATP7B NM_000053.4 frameshift
• Clinical Significance: Pathogenic criteria provided, multiple submitters, no conflicts P:8
• Conservation: PhyloP100: -1.16

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]

ACMG classification

Verdict is Pathogenic. Variant got 18 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 13-51944204-TG-T is Pathogenic according to our data. Variant chr13-51944204-TG-T is described in ClinVar as [Pathogenic]. Clinvar id is 551108.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr13-51944204-TG-T is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ATP7B	NM_000053.4	c.3147del	p.Thr1050HisfsTer71	frameshift_variant	14/21	ENST00000242839.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ATP7B	ENST00000242839.10	c.3147del	p.Thr1050HisfsTer71	frameshift_variant	14/21	1	NM_000053.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000889 AC: 13 AN: 1461868 Hom.: 0 Cov.: 31 AF XY: 0.0000110 AC XY: 8 AN XY: 727232

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: 0.0000464

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000809

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:8

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Wilson disease Pathogenic:8

Pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Jul 13, 2021	Variant summary: ATP7B c.3147delC (p.Thr1050HisfsX71) results in a premature termination codon, predicted to cause a truncation of the encoded protein or absence of the protein due to nonsense mediated decay, which are commonly known mechanisms for disease. Truncations downstream of this position have been classified as pathogenic by our laboratory. The variant was absent in 249364 control chromosomes (gnomAD and publication data). c.3147delC has been reported in the literature in multiple individuals affected with Wilson Disease, including at least one homozygote (Thomas_1995, Gupta_2007, Aggarwal_2013, Mukherjee_2014). These data indicate that the variant is very likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. One ClinVar submitter (evaluation after 2014) cites the variant as pathogenic. Based on the evidence outlined above, the variant was classified as pathogenic. -
Pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Aug 10, 2021	- -
Pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Mar 10, 2017	- -
Pathogenic, criteria provided, single submitter	clinical testing	Arcensus	Feb 01, 2013	- -
Pathogenic, criteria provided, single submitter	clinical testing	Invitae	Oct 30, 2023	This sequence change creates a premature translational stop signal (p.Thr1050Hisfs*71) in the ATP7B gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in ATP7B are known to be pathogenic (PMID: 10441329, 16283883). This variant is not present in population databases (gnomAD no frequency). This premature translational stop signal has been observed in individual(s) with Wilson disease (PMID: 7626145). This variant is also known as 3149delC, 3146delC or Ala1049Ala-fs. ClinVar contains an entry for this variant (Variation ID: 551108). For these reasons, this variant has been classified as Pathogenic. -
Pathogenic, no assertion criteria provided	clinical testing	Natera, Inc.	Jun 12, 2020	- -
Pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Aug 11, 2023	- -
Pathogenic, criteria provided, single submitter	clinical testing	Fulgent Genetics, Fulgent Genetics	Jan 14, 2022	- -

Computational scores

Source: dbNSFP v4.3

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: rs762031690; hg19: chr13-52518340;