rs61733684

Positions:

• chr13-51958491-C-A
• chr13-51958491-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 4P and 1B. PM1 PM2 BP4

The NM_000053.4(ATP7B):​c.2175G>T​(p.Arg725Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R725K) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: ATP7B NM_000053.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.523

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 Uncertain_significance. Variant got 3 ACMG points.

• PM1: In a hotspot region, there are 3 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 10 uncertain in NM_000053.4
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.36160597).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
ATP7B	NM_000053.4	c.2175G>T	p.Arg725Ser	missense_variant	8/21	ENST00000242839.10

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
ATP7B	ENST00000242839.10	c.2175G>T	p.Arg725Ser	missense_variant	8/21	1	NM_000053.4	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Wilson disease Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Feb 24, 2022

This variant is not present in population databases (gnomAD no frequency). This sequence change replaces arginine, which is basic and polar, with serine, which is neutral and polar, at codon 725 of the ATP7B protein (p.Arg725Ser). This variant has not been reported in the literature in individuals affected with ATP7B-related conditions. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. 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 not expected to disrupt ATP7B protein function. ClinVar contains an entry for this variant (Variation ID: 938285). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.23
BayesDel_addAF	Uncertain	0.12	D
BayesDel_noAF	Uncertain	-0.060
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Pathogenic	0.81	D;.;.
Eigen	Uncertain	0.40
Eigen_PC	Uncertain	0.24
FATHMM_MKL	Benign	0.16	N
LIST_S2	Benign	0.84	T;T;T
M_CAP	Benign	0.048	D
MetaRNN	Benign	0.36	T;T;T
MetaSVM	Uncertain	0.25	D
MutationAssessor	Pathogenic	3.4	M;.;.
MutationTaster	Benign	1.0	N;N;N;N;N;N;N;N
PrimateAI	Benign	0.29	T
PROVEAN	Uncertain	-2.8	D;D;D
REVEL	Uncertain	0.46
Sift	Benign	0.14	T;T;T
Sift4G	Benign	0.20	T;T;T
Polyphen		0.47	P;D;P
Vest4		0.54
MutPred		0.60		Loss of methylation at R725 (P = 0.0343);.;Loss of methylation at R725 (P = 0.0343);
MVP		0.99
MPC		0.11
ClinPred		0.86	D
GERP RS		4.5
Varity_R		0.26
gMVP		0.75

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: rs61733684; hg19: chr13-52532627;