3-138023750-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 4P and 0B. PM2PP3_Moderate

The NM_016369.4(CLDN18):c.313C>T(p.Arg105Cys) variant causes a missense change. The variant allele was found at a frequency of 0.0000353 in 1,613,908 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000037 ( 0 hom. )

Consequence

CLDN18
NM_016369.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 5.08

Variant links:

Genes affected

CLDN18 (HGNC:2039): (claudin 18) This gene encodes a member of the claudin family. Claudins are integral membrane proteins and components of tight junction strands. Tight junction strands serve as a physical barrier to prevent solutes and water from passing freely through the paracellular space between epithelial or endothelial cell sheets, and also play critical roles in maintaining cell polarity and signal transductions. This gene is upregulated in patients with ulcerative colitis and highly overexpressed in infiltrating ductal adenocarcinomas. PKC/MAPK/AP-1 (protein kinase C/mitogen-activated protein kinase/activator protein-1) dependent pathway regulates the expression of this gene in gastric cells. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jun 2010]

CLDN18 links:

LOC105374127 (HGNC:):

LOC105374127 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

MetaRNN computational evidence supports a deleterious effect, 0.886

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CLDN18	NM_016369.4 link	c.313C>T	p.Arg105Cys	missense_variant	Exon 2 of 5	ENST00000183605.10	NP_057453.1	P56856-1
CLDN18	NM_001002026.3 link	c.313C>T	p.Arg105Cys	missense_variant	Exon 2 of 5		NP_001002026.1	P56856-2
LOC105374127	XR_007096112.1 link	n.-91G>A		upstream_gene_variant
LOC105374127	XR_924534.3 link	n.-91G>A		upstream_gene_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
CLDN18	ENST00000183605.10 link	c.313C>T	p.Arg105Cys	missense_variant	Exon 2 of 5	1	NM_016369.4	ENSP00000183605.5	P56856-1
CLDN18	ENST00000343735.8 link	c.313C>T	p.Arg105Cys	missense_variant	Exon 2 of 5	1		ENSP00000340939.4	P56856-2
CLDN18	ENST00000479660.1 link	n.313C>T		non_coding_transcript_exon_variant	Exon 2 of 4	2		ENSP00000419732.1	F8WEY4

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152106

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000239

AC:

AN:

251344

Hom.:

AF XY:

0.0000221

AC XY:

AN XY:

135844

show subpopulations

Gnomad AFR exome

AF:

0.0000615

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000980

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000369

AC:

AN:

1461802

Hom.:

Cov.:

AF XY:

0.0000330

AC XY:

AN XY:

727206

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000812

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000369

Gnomad4 OTH exome

AF:

0.0000993

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152106

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74298

show subpopulations

Gnomad4 AFR

AF:

0.0000483

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000434

Hom.:

Bravo

AF:

0.0000151

ESP6500AA

AF:

0.00

AC:

ESP6500EA

AF:

0.000116

AC:

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 09, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.313C>T (p.R105C) alteration is located in exon 2 (coding exon 2) of the CLDN18 gene. This alteration results from a C to T substitution at nucleotide position 313, causing the arginine (R) at amino acid position 105 to be replaced by a cysteine (C). 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

0.33

BayesDel_addAF

Uncertain

0.097

BayesDel_noAF

Uncertain

0.10

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.70

.;D

Eigen

Pathogenic

0.80

Eigen_PC

Pathogenic

0.76

FATHMM_MKL

Uncertain

0.85

LIST_S2

Uncertain

0.96

D;D

M_CAP

Uncertain

0.17

MetaRNN

Pathogenic

0.89

D;D

MetaSVM

Pathogenic

0.86

MutationAssessor

Uncertain

2.7

M;M

PrimateAI

Uncertain

0.59

PROVEAN

Uncertain

-3.9

D;D

REVEL

Pathogenic

0.72

Sift

Uncertain

0.0010

D;D

Sift4G

Uncertain

0.0030

D;D

Polyphen

1.0

D;D

Vest4

0.77

MVP

0.99

MPC

0.93

ClinPred

0.97

GERP RS

5.4

Varity_R

0.66

gMVP

0.86

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over