NM_004817.4:c.644G>T

Variant names:

• chr9-69221188-G-T
• rs201977617
• NM_004817.4:c.644G>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_004817.4(TJP2):​c.644G>T​(p.Arg215Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000691 in 1,447,356 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. 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. R215H) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: TJP2 NM_004817.4 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.36
• Publications: 0 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: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.16522503).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
TJP2	NM_004817.4	c.644G>T	p.Arg215Leu	missense_variant	Exon 5 of 23	ENST00000377245.9	NP_004808.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
TJP2	ENST00000377245.9	c.644G>T	p.Arg215Leu	missense_variant	Exon 5 of 23	1	NM_004817.4	ENSP00000366453.4
ENSG00000285130	ENST00000642889.1	c.1031G>T	p.Arg344Leu	missense_variant	Exon 7 of 25			ENSP00000493780.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome AF: 6.91e-7 AC: 1 AN: 1447356 Hom.: 0 Cov.: 33 AF XY: 0.00000139 AC XY: 1 AN XY: 719098

African (AFR) AF: 0.00 AC: 0 AN: 33178

American (AMR) AF: 0.00 AC: 0 AN: 43468

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25836

East Asian (EAS) AF: 0.00 AC: 0 AN: 39052

South Asian (SAS) AF: 0.00 AC: 0 AN: 84550

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 50670

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5746

European-Non Finnish (NFE) AF: 9.05e-7 AC: 1 AN: 1105118

Other (OTH) AF: 0.00 AC: 0 AN: 59738

GnomAD4 genome Cov.: 33

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.15
BayesDel_addAF	Benign	-0.055	T
BayesDel_noAF	Benign	-0.32
CADD	Benign	18
DANN	Uncertain	0.99
DEOGEN2	Benign	0.32	.;.;.;.;T;.;T;.;.;.;.;.;.;.
Eigen	Benign	-0.074
Eigen_PC	Benign	-0.060
FATHMM_MKL	Benign	0.74	D
LIST_S2	Uncertain	0.94	D;D;D;D;.;D;D;D;D;D;D;D;D;D
M_CAP	Benign	0.042	D
MetaRNN	Benign	0.17	T;T;T;T;T;T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-0.69	T
MutationAssessor	Uncertain	2.5	.;.;.;.;M;M;M;.;.;.;.;.;.;.
PhyloP100		3.4
PrimateAI	Pathogenic	0.83	D
PROVEAN	Benign	-2.1	.;N;.;.;.;N;N;.;.;.;N;.;N;.
REVEL	Benign	0.10
Sift	Benign	0.26	.;T;.;.;.;T;T;.;.;.;T;.;T;.
Sift4G	Uncertain	0.017	.;D;.;.;.;D;T;.;.;.;D;.;D;.
Polyphen		0.47, 0.35	.;.;.;.;P;B;P;.;.;.;.;.;.;.
Vest4		0.40, 0.50, 0.40, 0.48, 0.45
MutPred		0.31		.;.;.;.;Loss of MoRF binding (P = 0.0325);Loss of MoRF binding (P = 0.0325);Loss of MoRF binding (P = 0.0325);Loss of MoRF binding (P = 0.0325);Loss of MoRF binding (P = 0.0325);.;.;.;.;.;
MVP		0.59
MPC		0.38
ClinPred		0.84	D
GERP RS		4.2
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.20
gMVP		0.71
Mutation Taster		=97/3	polymorphism

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: rs201977617; hg19: chr9-71836104;