16-68813322-C-T

Position:

• chr16-68813322-C-T

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PVS1 PM5_Supporting PS4_Supporting PM2_Supporting

This summary comes from the ClinGen Evidence Repository: The c.1147C>T (p.Gln383Ter) variant is predicted to result in a premature stop codon that leads to a truncated or absent protein (PVS1, PM5_Supporting). This variant is absent in the gnomAD cohort (PM2_Supporting; http://gnomad.broadinstitute.org). The variant has been reported in at least one family meeting HDGC clinical criteria (PS4_Supporting; PMID 23709761). In summary, this variant meets criteria to be classified as pathogenic based on the ACMG/AMP criteria applied as specified by the CDH1 Variant Curation Expert Panel (Variant Interpretation Guidelines Version 3.1): PVS1, PM2_Supporting, PS4_Supporting, PM5_Supporting. LINK:https://erepo.genome.network/evrepo/ui/classification/CA169687/MONDO:0007648/007

• Frequency: Genomes: not found (cov: 32)
• Consequence: CDH1 NM_004360.5 stop_gained
• Clinical Significance: Pathogenic reviewed by expert panel P:5
• Conservation: PhyloP100: -0.734

Genes affected

CDH1 (HGNC:1748): (cadherin 1) This gene encodes a classical cadherin of the cadherin superfamily. Alternative splicing results in multiple transcript variants, at least one of which encodes a preproprotein that is proteolytically processed to generate the mature glycoprotein. This calcium-dependent cell-cell adhesion protein is comprised of five extracellular cadherin repeats, a transmembrane region and a highly conserved cytoplasmic tail. Mutations in this gene are correlated with gastric, breast, colorectal, thyroid and ovarian cancer. Loss of function of this gene is thought to contribute to cancer progression by increasing proliferation, invasion, and/or metastasis. The ectodomain of this protein mediates bacterial adhesion to mammalian cells and the cytoplasmic domain is required for internalization. This gene is present in a gene cluster with other members of the cadherin family on chromosome 16. [provided by RefSeq, Nov 2015]

ACMG classification

Verdict is Pathogenic. Variant got 11 ACMG points.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CDH1	NM_004360.5	c.1147C>T	p.Gln383Ter	stop_gained	9/16	ENST00000261769.10
CDH1	NM_001317185.2	c.-469C>T		5_prime_UTR_variant	9/16
CDH1	NM_001317186.2	c.-673C>T		5_prime_UTR_variant	9/15
CDH1	NM_001317184.2	c.1137+1059C>T		intron_variant

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CDH1	ENST00000261769.10	c.1147C>T	p.Gln383Ter	stop_gained	9/16	1	NM_004360.5	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:5

Revision: reviewed by expert panel

Submissions by phenotype

Hereditary diffuse gastric adenocarcinoma Pathogenic:2

Pathogenic, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Apr 26, 2021	For these reasons, this variant has been classified as Pathogenic. This variant has been observed in individual(s) with diffuse gastric cancer (PMID: 23709761). ClinVar contains an entry for this variant (Variation ID: 142888). This variant is not present in population databases (ExAC no frequency). This sequence change creates a premature translational stop signal (p.Gln383*) in the CDH1 gene. It is expected to result in an absent or disrupted protein product. Loss-of-function variants in CDH1 are known to be pathogenic (PMID: 15235021, 20373070). -
Pathogenic, criteria provided, single submitter	clinical testing	European Reference Network on Genetic Tumour Risk Syndromes (ERN-GENTURIS), i3s - Instituto de Investigação e Inovação em Saúde, University of Porto	Aug 01, 2022	PVS1; PS4_Supporting; PM2 (PMID: 30311375) -

Familial cancer of breast;C0376358:Malignant tumor of prostate;C0476089:Endometrial carcinoma;C0919267:Ovarian neoplasm;C1708349:Hereditary diffuse gastric adenocarcinoma;C4551988:Blepharocheilodontic syndrome 1 Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Fulgent Genetics, Fulgent Genetics

Oct 31, 2018

- -

CDH1-related diffuse gastric and lobular breast cancer syndrome Pathogenic:1

Pathogenic, reviewed by expert panel

curation

ClinGen CDH1 Variant Curation Expert Panel

Aug 25, 2023

The c.1147C>T (p.Gln383Ter) variant is predicted to result in a premature stop codon that leads to a truncated or absent protein (PVS1, PM5_Supporting). This variant is absent in the gnomAD cohort (PM2_Supporting; http://gnomad.broadinstitute.org). The variant has been reported in at least one family meeting HDGC clinical criteria (PS4_Supporting; PMID 23709761). In summary, this variant meets criteria to be classified as pathogenic based on the ACMG/AMP criteria applied as specified by the CDH1 Variant Curation Expert Panel (Variant Interpretation Guidelines Version 3.1): PVS1, PM2_Supporting, PS4_Supporting, PM5_Supporting. -

Hereditary cancer-predisposing syndrome Pathogenic:1

Pathogenic, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 27, 2014

The p.Q383* pathogenic mutation (also known as c.1147C>T), located in coding exon 9 of the CDH1 gene, results from a C to T substitution at nucleotide position 383. This changes the amino acid from a glutamine to a stop codon within coding exon 9. This mutation was observed in a French family with 3 cases of diffuse gastric cancer diagnosed at ages 24, 24, and 43, respectively (Benusiglio, PR et al. J Med Genet. 2013 Jul;50(7):486-9). In addition to the clinical data presented in the literature, since premature stop codons are typically deleterious in nature, this alteration is interpreted as a disease-causing mutation (ACMG Recommendations for Standards for Interpretation and Reporting of Sequence Variations. Revision 2007. Genet Med. 2008;10:294). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.35	D
BayesDel_noAF	Pathogenic	0.26
CADD	Pathogenic	34
DANN	Benign	0.97
Eigen	Benign	-0.048
Eigen_PC	Benign	-0.42
FATHMM_MKL	Benign	0.051	N
MutationTaster	Benign	1.0	A;N
Vest4		0.79
GERP RS		-4.2

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs587782798; hg19: chr16-68847225; COSMIC: COSV55735421; COSMIC: COSV55735421;