20-44114609-TGC-TGCGCGCGC

Variant names:

• chr20-44114609-T-TGCGCGC
• rs1555853088
• NM_020433.5:c.*14+172_*14+173insGCGCGC

Variant summary

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

The NM_020433.5(JPH2):​c.*14+172_*14+173insGCGCGC variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000208 in 144,070 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.000021 (0 hom., cov: 29)
• Consequence: JPH2 NM_020433.5 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.00600
• Publications: 0 publications found

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

ACMG classification

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	c.*14+172_*14+173insGCGCGC		intron_variant	Intron 5 of 5	ENST00000372980.4	NP_065166.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
JPH2	ENST00000372980.4	c.*14+172_*14+173insGCGCGC		intron_variant	Intron 5 of 5	5	NM_020433.5	ENSP00000362071.3

Frequencies

GnomAD3 genomes AF: 0.0000208 AC: 3 AN: 144070 Hom.: 0 Cov.: 29

Gnomad AFR AF: 0.0000775

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00

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: 0.00

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.0000208 AC: 3 AN: 144070 Hom.: 0 Cov.: 29 AF XY: 0.0000429 AC XY: 3 AN XY: 69884

African (AFR) AF: 0.0000775 AC: 3 AN: 38730

American (AMR) AF: 0.00 AC: 0 AN: 14328

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3362

East Asian (EAS) AF: 0.00 AC: 0 AN: 4592

South Asian (SAS) AF: 0.00 AC: 0 AN: 4376

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 9756

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 294

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 65756

Other (OTH) AF: 0.00 AC: 0 AN: 1994

Alfa AF: 0.00 Hom.: 10

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.0060

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1555853088; hg19: chr20-42743249;