Genetic Variant JPH2:p.Val692Leu (chr20-44114813-C-G) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_020433.5(JPH2):c.2074G>C(p.Val692Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000688 in 1,454,254 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V692I) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 6.9e-7 ( 0 hom. )

Consequence

JPH2
NM_020433.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 6.34

Publications

0 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:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
JPH2	NM_020433.5 link	c.2074G>C	p.Val692Leu	missense_variant	Exon 5 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.2074G>C	p.Val692Leu	missense_variant	Exon 5 of 6	5	NM_020433.5	ENSP00000362071.3		Q9BR39-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.88e-7

AC:

AN:

1454254

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

722304

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33436

American (AMR)

AF:

0.00

AC:

AN:

43554

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25824

East Asian (EAS)

AF:

0.00

AC:

AN:

39500

South Asian (SAS)

AF:

0.00

AC:

AN:

84018

European-Finnish (FIN)

AF:

0.00

AC:

AN:

52840

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5742

European-Non Finnish (NFE)

AF:

9.02e-7

AC:

AN:

1109174

Other (OTH)

AF:

0.00

AC:

AN:

60166

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.87

BayesDel_addAF

Uncertain

0.054

BayesDel_noAF

Benign

-0.16

CADD

Pathogenic

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.21

Eigen

Uncertain

0.68

Eigen_PC

Uncertain

0.64

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.91

M_CAP

Benign

0.053

MetaRNN

Uncertain

0.68

MetaSVM

Benign

-0.56

MutationAssessor

Uncertain

2.4

PhyloP100

6.3

PrimateAI

Pathogenic

0.86

PROVEAN

Benign

-1.4

REVEL

Benign

0.13

Sift

Uncertain

0.0060

Sift4G

Benign

0.066

Polyphen

0.98

Vest4

0.67

MutPred

0.27

Gain of disorder (P = 0.0887);

MVP

0.88

ClinPred

0.98

GERP RS

4.7

Varity_R

0.33

gMVP

0.84

Mutation Taster

=65/35

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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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over