NM_020433.5:c.637C>T

Variant names:

Variant summary

Our verdict is Benign. Variant got -9 ACMG points: 0P and 9B. BP4_StrongBP6BS2

The NM_020433.5(JPH2):c.637C>T(p.Arg213Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000241 in 1,432,604 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 12/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.0013 ( 2 hom., cov: 32)

Exomes 𝑓: 0.00012 ( 0 hom. )

Consequence

JPH2
NM_020433.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:7

Conservation

PhyloP100: 1.26

Variant links:

Genes affected

JPH2 (HGNC:14202): (junctophilin 2) Junctional complexes between the plasma membrane and endoplasmic/sarcoplasmic reticulum are a common feature of all excitable cell types and mediate cross talk between cell surface and intracellular ion channels. The protein encoded by this gene is a component of junctional complexes and is composed of a C-terminal hydrophobic segment spanning the endoplasmic/sarcoplasmic reticulum membrane and a remaining cytoplasmic domain that shows specific affinity for the plasma membrane. This gene is a member of the junctophilin gene family. Alternative splicing has been observed at this locus and two variants encoding distinct isoforms are described. [provided by RefSeq, Jul 2008]

JPH2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -9 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.008232176).

BP6

Variant 20-44160150-G-A is Benign according to our data. Variant chr20-44160150-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 201797.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=4, Benign=1, Uncertain_significance=2}. Variant chr20-44160150-G-A is described in Lovd as [Benign]. Variant chr20-44160150-G-A is described in Lovd as [Likely_benign].

BS2

High Homozygotes in GnomAd4 at 2 SD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
JPH2	NM_020433.5 link	c.637C>T	p.Arg213Trp	missense_variant	Exon 2 of 6	ENST00000372980.4	NP_065166.2	Q9BR39-1Q86VZ3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
JPH2	ENST00000372980.4 link	c.637C>T	p.Arg213Trp	missense_variant	Exon 2 of 6	5	NM_020433.5	ENSP00000362071.3		Q9BR39-1

Frequencies

GnomAD3 genomes

AF:

0.00127

AC:

192

AN:

151650

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00447

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000329

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.000961

GnomAD3 exomes

AF:

0.000374

AC:

AN:

50800

Hom.:

AF XY:

0.000301

AC XY:

AN XY:

29854

show subpopulations

Gnomad AFR exome

AF:

0.0137

Gnomad AMR exome

AF:

0.000406

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000422

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000908

Gnomad OTH exome

AF:

0.000639

GnomAD4 exome

AF:

0.000119

AC:

153

AN:

1280846

Hom.:

Cov.:

AF XY:

0.000105

AC XY:

AN XY:

629038

show subpopulations

Gnomad4 AFR exome

AF:

0.00458

Gnomad4 AMR exome

AF:

0.000494

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000182

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000387

Gnomad4 OTH exome

AF:

0.000266

GnomAD4 genome

AF:

0.00127

AC:

192

AN:

151758

Hom.:

Cov.:

AF XY:

0.00116

AC XY:

AN XY:

74174

show subpopulations

Gnomad4 AFR

AF:

0.00446

Gnomad4 AMR

AF:

0.000328

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.000951

Alfa

AF:

0.00135

Hom.:

Bravo

AF:

0.00151

ExAC

AF:

0.000338

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:7

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1Benign:2

Clinical Genetics, Academic Medical Center

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Oct 28, 2024

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

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Variant summary: JPH2 c.637C>T (p.Arg213Trp) results in a non-conservative amino acid change in the encoded protein sequence. Four of five in-silico tools predict a benign effect of the variant on protein function. The variant allele was found at a frequency of 0.00037 in 50800 control chromosomes in the gnomAD database, including 1 homozygotes. The observed variant frequency is approximately 15 fold of the estimated maximal expected allele frequency for a pathogenic variant in JPH2 causing Cardiomyopathy phenotype (2.5e-05). To our knowledge, no occurrence of c.637C>T in individuals affected with Cardiomyopathy and no experimental evidence demonstrating its impact on protein function have been reported. ClinVar contains an entry for this variant (Variation ID: 201797). Based on the evidence outlined above, the variant was classified as likely benign. -

Jun 12, 2015

Laboratory for Molecular Medicine, Mass General Brigham Personalized Medicine

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Arg213Trp variant in JPH2 has not been previously reported in individuals with cardiomyopathy, but has been identified in 0.1% (4/3380) of South Asian chr omosomes and 1/82 African chromosomes by the Exome Aggregation Consortium (ExAC, http://exac.broadinstitute.org). Computational prediction tools and conservatio n analysis do not provide strong support for or against an impact to the protein . In summary, the clinical significance of the p.Arg213Trp variant is uncertain. -

not provided

Benign:3

May 14, 2021

GeneDx

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Mar 01, 2024

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Hypertrophic cardiomyopathy 17;C5561970:Cardiomyopathy, dilated, 2E

Uncertain:1

Mar 30, 2021

Center for Genomics, Ann and Robert H. Lurie Children's Hospital of Chicago

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

JPH2 NM_020433.4 exon 2 p.Arg213Trp (c.637C>T): This variant has not been reported in the literature but is present in 0.07% (64/81352) of total alleles in the Genome Aggregation Database, including 2 homozygotes (https://gnomad.broadinstitute.org/variant/20-42788790-G-A). This variant is present in ClinVar (Variation ID:201797). Evolutionary conservation and computational predictive tools for this variant are unclear. In summary, data on this variant is insufficient for disease classification. Therefore, the clinical significance of this variant is uncertain. -

Hypertrophic cardiomyopathy

Benign:1

Jan 30, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Cardiovascular phenotype

Benign:1

Nov 21, 2019

Ambry Genetics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.22

BayesDel_addAF

Benign

-0.41

BayesDel_noAF

Benign

-0.34

CADD

Benign

DANN

Uncertain

1.0

DEOGEN2

Benign

0.34

Eigen

Benign

-0.40

Eigen_PC

Benign

-0.54

FATHMM_MKL

Benign

0.21

LIST_S2

Benign

0.66

MetaRNN

Benign

0.0082

MetaSVM

Benign

-0.88

MutationAssessor

Benign

0.90

PrimateAI

Pathogenic

0.88

PROVEAN

Uncertain

-2.9

REVEL

Benign

0.18

Sift

Uncertain

0.029

Sift4G

Benign

0.083

Polyphen

1.0

Vest4

0.31

MVP

0.73

ClinPred

0.027

GERP RS

3.1

Varity_R

0.11

gMVP

0.60

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over