rs587777518

Variant names:

• chr9-69221309-GGCCT-G
• rs587777518
• NM_004817.4:c.766_769delGCCT

Variant summary

Our verdict is Pathogenic. The variant received 11 ACMG points: 11P and 0B. PVS1 PM2 PP5

The NM_004817.4(TJP2):​c.766_769delGCCT​(p.Ala256ThrfsTer54) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: TJP2 NM_004817.4 frameshift
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:3 U:1
• Conservation: PhyloP100: 2.70
• Publications: 3 publications found

Genes affected

TJP2 (HGNC:11828): (tight junction protein 2) This gene encodes a zonula occluden that is a member of the membrane-associated guanylate kinase homolog family. The encoded protein functions as a component of the tight junction barrier in epithelial and endothelial cells and is necessary for proper assembly of tight junctions. Mutations in this gene have been identified in patients with hypercholanemia, and genomic duplication of a 270 kb region including this gene causes autosomal dominant deafness-51. Alternatively spliced transcripts encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Nov 2011]

TJP2 Gene-Disease associations (from GenCC):

• cholestasis, progressive familial intrahepatic, 4

  Inheritance: AR Classification: STRONG Submitted by: Ambry Genetics, Labcorp Genetics (formerly Invitae)
• autosomal dominant nonsyndromic hearing loss

  Inheritance: AD Classification: SUPPORTIVE, LIMITED Submitted by: Ambry Genetics, Orphanet
• familial hypercholanemia

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet
• nonsyndromic genetic hearing loss

  Inheritance: AD Classification: LIMITED Submitted by: ClinGen
• hypercholanemia, familial 1

  Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

ENSG00000285130 (HGNC:):

ACMG classification

Our verdict: Pathogenic. The variant received 11 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 9-69221309-GGCCT-G is Pathogenic according to our data. Variant chr9-69221309-GGCCT-G is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 139627.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004817.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TJP2	NM_004817.4	MANE Select	c.766_769delGCCT	p.Ala256ThrfsTer54	frameshift	Exon 5 of 23	NP_004808.2
	TJP2	NM_001170416.2		c.859_862delGCCT	p.Ala287ThrfsTer54	frameshift	Exon 5 of 23	NP_001163887.1
	TJP2	NM_001369875.1		c.778_781delGCCT	p.Ala260ThrfsTer54	frameshift	Exon 5 of 23	NP_001356804.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	TJP2	ENST00000377245.9	TSL:1 MANE Select	c.766_769delGCCT	p.Ala256ThrfsTer54	frameshift	Exon 5 of 23	ENSP00000366453.4
	ENSG00000285130	ENST00000642889.1		c.1153_1156delGCCT	p.Ala385ThrfsTer54	frameshift	Exon 7 of 25	ENSP00000493780.1
	TJP2	ENST00000348208.9	TSL:1	c.766_769delGCCT	p.Ala256ThrfsTer54	frameshift	Exon 5 of 21	ENSP00000345893.4

Frequencies

GnomAD3 genomes Cov.: 33

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

GnomAD4 genome Cov.: 33

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:3 Uncertain:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

not provided Pathogenic:2

Dec 28, 2022

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene for which loss of function is a known mechanism of disease; Not observed at significant frequency in large population cohorts (gnomAD); This variant is associated with the following publications: (PMID: 24614073)

Oct 17, 2014

Eurofins Ntd Llc (ga)

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Cholestasis, progressive familial intrahepatic, 4 Pathogenic:1

Apr 01, 2014

OMIM

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: literature only

Hypercholanemia, familial 1 Uncertain:1

Apr 04, 2024

Genomic Medicine Center of Excellence, King Faisal Specialist Hospital and Research Centre

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		2.7
Mutation Taster		=0/200	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs587777518; hg19: chr9-71836225;