rs199623434

Positions:

• chr13-51946382-C-G

Variant summary

Our verdict is Pathogenic. Variant got 20 ACMG points: 20P and 0B. PS1 PM1 PM2 PP3_Strong PP5_Very_Strong

The NM_000053.4(ATP7B):​c.2962G>C​(p.Gly988Arg) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000274 in 1,461,544 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 12/21 in silico tools predict a damaging outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★★). Another nucleotide change resulting in same amino acid change has been previously reported as Likely pathogenicin Lovd.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: ATP7B NM_000053.4 missense
• Clinical Significance: Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:4
• 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]

ACMG classification

Verdict is Pathogenic. Variant got 20 ACMG points.

• PS1: Transcript NM_000053.4 (ATP7B) is affected with MISSENSE_VARIANT having same AA change as one Pathogenic present in Lovd
• PM1: In a transmembrane_region Helical (size 21) in uniprot entity ATP7B_HUMAN there are 9 pathogenic changes around while only 1 benign (90%) in NM_000053.4
• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.991
• PP5: Variant 13-51946382-C-G is Pathogenic according to our data. Variant chr13-51946382-C-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 556075.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.2962G>C	p.Gly988Arg	missense_variant	13/21	ENST00000242839.10	NP_000044.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
ATP7B	ENST00000242839.10	c.2962G>C	p.Gly988Arg	missense_variant	13/21	1	NM_000053.4	ENSP00000242839	P1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 0.00000274 AC: 4 AN: 1461544 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 727042

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 Cov.: 33

Bravo AF: 0.00000378

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:4

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Wilson disease Pathogenic:4

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 31, 2024	This sequence change replaces glycine, which is neutral and non-polar, with arginine, which is basic and polar, at codon 988 of the ATP7B protein (p.Gly988Arg). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with Wilson disease (PMID: 16283883, 22677543, 24094725, 24668339, 30230192). ClinVar contains an entry for this variant (Variation ID: 556075). 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) has been performed at Invitae for this missense variant, however the output from this modeling did not meet the statistical confidence thresholds required to predict the impact of this variant on ATP7B protein function. This variant disrupts the p.Gly988 amino acid residue in ATP7B. Other variant(s) that disrupt this residue have been determined to be pathogenic (PMID: 30702195). This suggests that this residue is clinically significant, and that variants that disrupt this residue are likely to be disease-causing. For these reasons, this variant has been classified as Pathogenic. -
Likely pathogenic, criteria provided, single submitter	clinical testing	Counsyl	Jan 10, 2018	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Baylor Genetics	May 25, 2023	- -
Likely pathogenic, criteria provided, single submitter	clinical testing	Women's Health and Genetics/Laboratory Corporation of America, LabCorp	Sep 18, 2023	Variant summary: ATP7B c.2962G>C (p.Gly988Arg) 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 248932 control chromosomes. c.2962G>C has been reported in the literature in multiple individuals affected with Wilson Disease, either at a homozygous state or at a compound heterozygous state along with second pathogenic variant(s) (example,Czlonkowska_2018, Gromadzka_2005, Bost_2012, Chabik_2014, Litwin_2014, Capalbo_2019, Ferenci_2019). These data indicate that the variant is likely to be associated with disease. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Additionally, several missense variants at the Gly988 residue have been reported in cases with Wilson Disease (c.2962G>A(p.G988R), c.2963G>A(p.G988E), c.2963G>T(p.G988V)), suggesting that this codon might be functionally important. These data indicate that the variant is very likely to be associated with disease. The following publications have been ascertained in the context of this evaluation (PMID: 22677543, 31589614, 23774950, 29418065, 30232804, 16283883, 24668339). Two submitters have cited clinical-significance assessments for this variant to ClinVar after 2014 (pathogenic, n=1; likely pathogenic, n=1). Based on the evidence outlined above, the variant was classified as likely pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.48	D
BayesDel_noAF	Pathogenic	0.45
CADD	Pathogenic	27
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.94	D;D;.;.;.;.
Eigen	Pathogenic	0.94
Eigen_PC	Pathogenic	0.87
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	0.99	D;D;D;D;D;D
M_CAP	Pathogenic	0.82	D
MetaRNN	Pathogenic	0.99	D;D;D;D;D;D
MetaSVM	Pathogenic	1.1	D
MutationAssessor	Pathogenic	3.2	M;.;.;.;.;.
MutationTaster	Benign	1.0	D;D;D;D;D;D;D
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-7.1	D;D;D;D;D;.
REVEL	Pathogenic	0.95
Sift	Uncertain	0.0010	D;D;D;D;D;.
Sift4G	Uncertain	0.018	D;D;D;D;D;D
Polyphen		1.0	D;P;D;D;B;D
Vest4		0.99
MutPred		0.95		Gain of methylation at G988 (P = 0.0242);.;.;.;.;.;
MVP		0.96
MPC		0.39
ClinPred		1.0	D
GERP RS		5.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.97
gMVP		0.98

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		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: rs199623434; hg19: chr13-52520518;