chr16-68833356-G-T

Variant names:

• chr16-68833356-G-T
• rs1555518239
• NM_004360.5:c.2506G>T

Variant summary

Our verdict is Pathogenic. Variant got 9 ACMG points: 9P and 0B. PM2_Supporting PVS1_Strong PS2

This summary comes from the ClinGen Evidence Repository: The c.2506G>T (p.Glu836*) variant results in a premature stop codon that leads to a truncated protein. While it is located within the nonsense mediated decay resistance region,it is recognized as the most c-terminal pathogenic variant in CDH1 (PVS1_Strong, PMID:29798843). This variant is absent in the gnomAD cohort (PM2_Supporting; http://gnomad.broadinstitute.org). There is one known de novo observation with parental confirmation in a patient with diffuse gastric cancer and/or lobular breast cancer (PS2; PMID:29798843). In summary, this variant meets criteria to be classified as likely pathogenic based on the ACMG/AMP criteria applied as specified by the CDH1 Variant Curation Expert Panel: PVS1_Strong, PM2_Supporting, PS2. LINK:https://erepo.genome.network/evrepo/ui/classification/CA396472215/MONDO:0007648/007

• Frequency: Genomes: not found (cov: 32)
• Consequence: CDH1 NM_004360.5 stop_gained
• Clinical Significance: Pathogenic reviewed by expert panel P:2
• Conservation: PhyloP100: 10.0

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 9 ACMG points.

• PVS1: For more information check the summary or visit ClinGen Evidence Repository.
• PS2: For more information check the summary or visit ClinGen Evidence Repository.
• PM2: For more information check the summary or visit ClinGen Evidence Repository.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CDH1	NM_004360.5	c.2506G>T	p.Glu836*	stop_gained	Exon 16 of 16	ENST00000261769.10	NP_004351.1
CDH1	NM_001317184.2	c.2323G>T	p.Glu775*	stop_gained	Exon 15 of 15		NP_001304113.1
CDH1	NM_001317185.2	c.958G>T	p.Glu320*	stop_gained	Exon 16 of 16		NP_001304114.1
CDH1	NM_001317186.2	c.541G>T	p.Glu181*	stop_gained	Exon 15 of 15		NP_001304115.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CDH1	ENST00000261769.10	c.2506G>T	p.Glu836*	stop_gained	Exon 16 of 16	1	NM_004360.5	ENSP00000261769.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Pathogenic

Submissions summary: Pathogenic:2

Revision: reviewed by expert panel

Submissions by phenotype

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

Aug 29, 2023

ClinGen CDH1 Variant Curation Expert Panel

Significance: Pathogenic

Review Status: reviewed by expert panel

Collection Method: curation

The c.2506G>T (p.Glu836*) variant results in a premature stop codon that leads to a truncated protein. While it is located within the nonsense mediated decay resistance region,it is recognized as the most c-terminal pathogenic variant in CDH1 (PVS1_Strong, PMID: 29798843). This variant is absent in the gnomAD cohort (PM2_Supporting; http://gnomad.broadinstitute.org). There is one known de novo observation with parental confirmation in a patient with diffuse gastric cancer and/or lobular breast cancer (PS2; PMID: 29798843). In summary, this variant meets criteria to be classified as likely pathogenic based on the ACMG/AMP criteria applied as specified by the CDH1 Variant Curation Expert Panel: PVS1_Strong, PM2_Supporting, PS2. -

Hereditary cancer-predisposing syndrome Pathogenic:1

Oct 15, 2018

Ambry Genetics

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.E836* variant (also known as c.2506G>T), located in coding exon 16 of the CDH1 gene, results from a G to T substitution at nucleotide position 2506. This changes the amino acid from a glutamic acid to a stop codon within coding exon 16. Premature stop codons are typically deleterious in nature, however, this stop codon occurs at the 3' terminus of CDH1, is not expected to trigger nonsense-mediated mRNA decay, and impacts only the last 47 amino acids of the protein. The exact functional impact of these removed amino acids is unknown at this time; however, the deleted region eliminates the catenin-binding domain, which is important for regulating the stability of cadherin mediated cell-cell adhesion (Ishiyama N et al. Cell. 2010 Apr;141:117-28). In addition, this alteration was detected de novo in a proband with a personal history of lobular breast cancer (Ambry internal data). Based on the majority of available evidence to date, this variant is likely to be pathogenic. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Pathogenic	0.62	D
BayesDel_noAF	Pathogenic	0.66
CADD	Pathogenic	45
DANN	Uncertain	1.0
Eigen	Pathogenic	1.3
Eigen_PC	Pathogenic	1.2
FATHMM_MKL	Pathogenic	0.99	D
Vest4		0.86
GERP RS		6.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.18		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: rs1555518239; hg19: chr16-68867259;