chr13-51960191-G-T

Position:

• chr13-51960191-G-T

Variant summary

Our verdict is Likely pathogenic. Variant got 7 ACMG points: 7P and 0B. PM2 PP3_Strong PP5

The NM_000053.4(ATP7B):​c.2078C>A​(p.Ser693Tyr) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency: Genomes: not found (cov: 32)
• Consequence: ATP7B NM_000053.4 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:1
• Conservation: PhyloP100: 9.87

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 (HGNC:):

ACMG classification

Verdict is Likely_pathogenic. Variant got 7 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.982
• PP5: Variant 13-51960191-G-T is Pathogenic according to our data. Variant chr13-51960191-G-T is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 632661.We mark this variant Likely_pathogenic, oryginal submissions are: {Uncertain_significance=1, Likely_pathogenic=1}.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ATP7B	NM_000053.4	c.2078C>A	p.Ser693Tyr	missense_variant	7/21	ENST00000242839.10	NP_000044.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ATP7B	ENST00000242839.10	c.2078C>A	p.Ser693Tyr	missense_variant	7/21	1	NM_000053.4	ENSP00000242839.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

Alfa AF: 0.0000386 Hom.: 0

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Wilson disease Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 29, 2023

This sequence change replaces serine, which is neutral and polar, with tyrosine, which is neutral and polar, at codon 693 of the ATP7B protein (p.Ser693Tyr). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with Wilson disease (PMID: 17272994). ClinVar contains an entry for this variant (Variation ID: 632661). 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 ATP7B protein function with a positive predictive value of 80%. This variant disrupts the p.Ser693 amino acid residue in ATP7B. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 18034201; Invitae). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. 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. -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Nov 16, 2018

Variant summary: ATP7B c.2078C>A (p.Ser693Tyr) results in a non-conservative amino acid change in the encoded protein sequence. Five of five in-silico tools predict a damaging effect of the variant on protein function. The variant was absent in 245986 control chromosomes (gnomAD and publication). The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. The c.2078C>A variant has been reported in the literature in one individual affected with Wilson Disease (Folhoffer_2006). Additionally, two other missense substitutions at the same codon have been associated with disease (p.S693C, p.S693P), suggesting the amino acid may be important for protein function. However, these data do not allow any strong conclusions about variant significance. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014. Based on the evidence outlined above, the variant was classified as VUS-possibly pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.92
BayesDel_addAF	Pathogenic	0.53	D
BayesDel_noAF	Pathogenic	0.53
CADD	Uncertain	26
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.85	D;T;.;.;.
Eigen	Pathogenic	0.79
Eigen_PC	Pathogenic	0.79
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Pathogenic	0.98	D;D;D;D;D
M_CAP	Pathogenic	0.30	D
MetaRNN	Pathogenic	0.98	D;D;D;D;D
MetaSVM	Pathogenic	1.0	D
MutationAssessor	Uncertain	2.1	M;.;.;.;.
PrimateAI	Uncertain	0.59	T
PROVEAN	Pathogenic	-5.2	D;D;D;.;D
REVEL	Pathogenic	0.89
Sift	Pathogenic	0.0	D;T;D;.;D
Sift4G	Pathogenic	0.0	D;D;D;D;D
Polyphen		1.0	D;D;P;D;D
Vest4		0.95
MutPred		0.90		Gain of helix (P = 0.2684);Gain of helix (P = 0.2684);.;Gain of helix (P = 0.2684);Gain of helix (P = 0.2684);
MVP		0.99
MPC		0.41
ClinPred		1.0	D
GERP RS		5.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.92
gMVP		0.94

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.050		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: rs1212479289; hg19: chr13-52534327;