rs1555291285

Positions:

• chr13-51958537-C-G

Variant summary

Our verdict is Pathogenic. Variant got 18 ACMG points: 18P and 0B. PM1 PM2 PM5 PP3_Strong PP5_Very_Strong

The NM_000053.4(ATP7B):​c.2129G>C​(p.Gly710Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,780 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. G710R) has been classified as Likely pathogenic.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: ATP7B NM_000053.4 missense
• Clinical Significance: Likely pathogenic criteria provided, multiple submitters, no conflicts P:4 U:1
• Conservation: PhyloP100: 7.86

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 Pathogenic. Variant got 18 ACMG points.

• PM1: In a transmembrane_region Helical (size 19) in uniprot entity ATP7B_HUMAN there are 6 pathogenic changes around while only 0 benign (100%) in NM_000053.4
• PM2: Very rare variant in population databases, with high coverage
• PM5: Other missense variant is known to change same aminoacid residue: Variant chrnull-null-null-null is described in UniProt as null.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.985
• PP5: Variant 13-51958537-C-G is Pathogenic according to our data. Variant chr13-51958537-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 551497.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
ATP7B	NM_000053.4	c.2129G>C	p.Gly710Ala	missense_variant	8/21	ENST00000242839.10	NP_000044.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ATP7B	ENST00000242839.10	c.2129G>C	p.Gly710Ala	missense_variant	8/21	1	NM_000053.4	ENSP00000242839.5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461780 Hom.: 0 Cov.: 30 AF XY: 0.00000138 AC XY: 1 AN XY: 727192

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:4 Uncertain:1

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Wilson disease Pathogenic:4 Uncertain:1

Likely pathogenic, criteria provided, single submitter	clinical testing	All of Us Research Program, National Institutes of Health	Aug 15, 2023	This missense variant replaces glycine with alanine at codon 710 of the ATP7B protein. Computational prediction suggests that this variant may have deleterious impact on protein structure and function (internally defined REVEL score threshold >= 0.7, PMID: 27666373). To our knowledge, functional studies have not been reported for this variant. This variant has been reported in the homozygous state in an individual affected with Wilson disease (PMID: 19596473). This variant has not been identified in the general population by the Genome Aggregation Database (gnomAD). A different variant affecting the same codon, p.Gly710Ser, is considered to be disease-causing (ClinVar variation ID: 156281), suggesting that Gly at this position is important for the protein function. Based on the available evidence, this variant is classified as Likely Pathogenic. -
Uncertain significance, flagged submission	clinical testing	Counsyl	Apr 14, 2017	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Genome-Nilou Lab	Aug 10, 2021	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	Apr 04, 2023	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Dec 07, 2018	This sequence change replaces glycine with alanine at codon 710 of the ATP7B protein (p.Gly710Ala). The glycine residue is highly conserved and there is a small physicochemical difference between glycine and alanine. This variant is not present in population databases (ExAC no frequency). This variant has been observed to be homozygous in individuals affected with hepatic Wilson disease (PMID: 9887381, 19596473). ClinVar contains an entry for this variant (Variation ID: 551497). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant disrupts the p.Gly710 amino acid residue in ATP7B. Other variant(s) that disrupt this residue have been observed in individuals with ATP7B-related conditions (PMID: 27398169, 8938442, 16233999, 16133174, 10544227, 17433323, 15967699), suggesting that it is a clinically significant residue. As a result, variants that disrupt this residue are likely to be causative of disease. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.48
BayesDel_addAF	Pathogenic	0.50	D
BayesDel_noAF	Pathogenic	0.48
CADD	Benign	23
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.85	D;.;.
Eigen	Uncertain	0.50
Eigen_PC	Uncertain	0.44
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.98	D;D;D
M_CAP	Uncertain	0.22	D
MetaRNN	Pathogenic	0.98	D;D;D
MetaSVM	Pathogenic	0.94	D
MutationAssessor	Benign	1.8	L;.;.
PrimateAI	Uncertain	0.70	T
PROVEAN	Pathogenic	-4.9	D;D;D
REVEL	Pathogenic	0.86
Sift	Pathogenic	0.0	D;D;D
Sift4G	Benign	0.17	T;T;T
Polyphen		1.0	D;P;D
Vest4		0.92
MutPred		0.89		Gain of catalytic residue at G710 (P = 0.0245);.;Gain of catalytic residue at G710 (P = 0.0245);
MVP		0.97
MPC		0.39
ClinPred		1.0	D
GERP RS		5.4
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.88
gMVP		0.92

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: rs1555291285; hg19: chr13-52532673;