NM_020433.5:c.637C>T

Variant names:

Variant summary

Our verdict is Benign. The variant received -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. 13/21 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:8

Conservation

PhyloP100: 1.26

Publications

4 publications found

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 Gene-Disease associations (from GenCC):

hypertrophic cardiomyopathy 17
Inheritance: AD Classification: STRONG, MODERATE Submitted by: PanelApp Australia, Labcorp Genetics (formerly Invitae)
cardiomyopathy, dilated, 2E
Inheritance: Unknown, AR Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
hypertrophic cardiomyopathy
Inheritance: AD Classification: MODERATE Submitted by: ClinGen
dilated cardiomyopathy
Inheritance: SD Classification: MODERATE Submitted by: ClinGen

JPH2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -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 submission is: [Conflicting_classifications_of_pathogenicity].

BS2

High Homozygotes in GnomAd4 at 2 SD,AD,Unknown,AR 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

GnomAD2 exomes

AF:

0.000374

AC:

AN:

50800

AF XY:

0.000301

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 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

African (AFR)

AF:

0.00458

AC:

112

AN:

24470

American (AMR)

AF:

0.000494

AC:

AN:

18214

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

20108

East Asian (EAS)

AF:

0.00

AC:

AN:

29348

South Asian (SAS)

AF:

0.000182

AC:

AN:

66110

European-Finnish (FIN)

AF:

0.00

AC:

AN:

31756

Middle Eastern (MID)

AF:

0.000531

AC:

AN:

3764

European-Non Finnish (NFE)

AF:

0.00000387

AC:

AN:

1034486

Other (OTH)

AF:

0.000266

AC:

AN:

52590

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.516

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

AF:

0.00127

AC:

192

AN:

151758

Hom.:

Cov.:

AF XY:

0.00116

AC XY:

AN XY:

74174

show subpopulations

African (AFR)

AF:

0.00446

AC:

185

AN:

41512

American (AMR)

AF:

0.000328

AC:

AN:

15228

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3466

East Asian (EAS)

AF:

0.00

AC:

AN:

5150

South Asian (SAS)

AF:

0.00

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10428

Middle Eastern (MID)

AF:

0.00

AC:

AN:

292

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

67836

Other (OTH)

AF:

0.000951

AC:

AN:

2104

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.516

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Alfa

AF:

0.00135

Hom.:

Bravo

AF:

0.00151

ExAC

AF:

0.000338

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:8

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1Benign:3

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. -

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. -

Clinical Genetics, Academic Medical Center

Significance:Benign

Review Status:no assertion criteria provided

Collection Method:clinical testing

- -

Apr 09, 2025

Molecular Diagnostic Laboratory for Inherited Cardiovascular Disease, Montreal Heart Institute

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Benign:3

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

- -

Mar 01, 2024

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

May 14, 2021

GeneDx

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

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

Uncertain:1

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

(source)

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

PhyloP100

1.3

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

Mutation Taster

=74/26

polymorphism

(source)

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

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NM_020433.5:c.637C>T

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over