7-73769517-G-A

Variant names:

• chr7-73769517-G-A
• rs781958238
• NM_001306.4:c.533C>T

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001306.4(CLDN3):​c.533C>T​(p.Ala178Val) variant causes a missense change. The variant allele was found at a frequency of 0.00000275 in 1,454,824 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: not found (cov: 33)
  • Exomes 𝑓: 0.0000027 (0 hom.)
• Consequence: CLDN3 NM_001306.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.10

Genes affected

CLDN3 (HGNC:2045): (claudin 3) Tight junctions represent one mode of cell-to-cell adhesion in epithelial or endothelial cell sheets, forming continuous seals around cells and serving as a physical barrier to prevent solutes and water from passing freely through the paracellular space. These junctions are comprised of sets of continuous networking strands in the outwardly facing cytoplasmic leaflet, with complementary grooves in the inwardly facing extracytoplasmic leaflet. The protein encoded by this intronless gene, a member of the claudin family, is an integral membrane protein and a component of tight junction strands. It is also a low-affinity receptor for Clostridium perfringens enterotoxin, and shares aa sequence similarity with a putative apoptosis-related protein found in rat. [provided by RefSeq, Jul 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 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
CLDN3	NM_001306.4	c.533C>T	p.Ala178Val	missense_variant	Exon 1 of 1	ENST00000395145.3	NP_001297.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CLDN3	ENST00000395145.3	c.533C>T	p.Ala178Val	missense_variant	Exon 1 of 1	6	NM_001306.4	ENSP00000378577.2

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD3 exomes AF: 0.00000851 AC: 2 AN: 235138 Hom.: 0 AF XY: 0.00000775 AC XY: 1 AN XY: 128970

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000297

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000960

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000275 AC: 4 AN: 1454824 Hom.: 0 Cov.: 31 AF XY: 0.00000138 AC XY: 1 AN XY: 723418

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000453

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00000180

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 33

ExAC AF: 0.0000167 AC: 2

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not specified Uncertain:1

Feb 07, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.533C>T (p.A178V) alteration is located in exon 1 (coding exon 1) of the CLDN3 gene. This alteration results from a C to T substitution at nucleotide position 533, causing the alanine (A) at amino acid position 178 to be replaced by a valine (V). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.14
BayesDel_addAF	Uncertain	0.034	T
BayesDel_noAF	Benign	-0.11
CADD	Uncertain	25
DANN	Pathogenic	1.0
DEOGEN2	Uncertain	0.56	D
Eigen	Uncertain	0.23
Eigen_PC	Benign	0.20
FATHMM_MKL	Uncertain	0.82	D
LIST_S2	Uncertain	0.90	D
M_CAP	Benign	0.044	D
MetaRNN	Uncertain	0.61	D
MetaSVM	Uncertain	-0.084	T
MutationAssessor	Benign	1.5	L
PrimateAI	Uncertain	0.49	T
PROVEAN	Uncertain	-3.2	D
REVEL	Uncertain	0.57
Sift	Uncertain	0.0040	D
Sift4G	Uncertain	0.055	T
Polyphen		0.94	P
Vest4		0.43
MutPred		0.59		Gain of sheet (P = 0.1945);
MVP		0.86
MPC		0.97
ClinPred		0.83	D
GERP RS		2.6
Varity_R		0.31
gMVP		0.61

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

LitVar

Other links and lift over

dbSNP: rs781958238; hg19: chr7-73183847;