16-68833356-G-T

Variant names:

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

Variant summary

Our verdict is Pathogenic. The variant received 9 ACMG points: 9P and 0B. PM2_Supporting PS2 PVS1_Strong

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
• Publications: 4 publications found

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]

CDH1 Gene-Disease associations (from GenCC):

• blepharocheilodontic syndrome 1

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: Ambry Genetics, Illumina, Labcorp Genetics (formerly Invitae), G2P
• CDH1-related diffuse gastric and lobular breast cancer syndrome

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), ClinGen, G2P
• hereditary breast carcinoma

  Inheritance: AD Classification: DEFINITIVE Submitted by: Ambry Genetics
• hereditary diffuse gastric adenocarcinoma

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: Ambry Genetics, Orphanet
• cleft soft palate

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• orofacial cleft 3

  Inheritance: AD Classification: MODERATE Submitted by: Ambry Genetics
• blepharocheilodontic syndrome

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• familial ovarian cancer

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Pathogenic. The variant received 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.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_004360.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CDH1	NM_004360.5	MANE Select	c.2506G>T	p.Glu836*	stop_gained	Exon 16 of 16	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

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	CDH1	ENST00000261769.10	TSL:1 MANE Select	c.2506G>T	p.Glu836*	stop_gained	Exon 16 of 16	ENSP00000261769.4
	CDH1	ENST00000422392.6	TSL:1	c.2323G>T	p.Glu775*	stop_gained	Exon 15 of 15	ENSP00000414946.2
	CDH1	ENST00000562836.5	TSL:1	n.2577G>T		non_coding_transcript_exon	Exon 15 of 15

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 v4.9

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
PhyloP100		10
Vest4		0.86
GERP RS		6.0
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Mutation Taster		=1/199	disease causing (ClinVar)

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

Other links and lift over

dbSNP: rs1555518239; hg19: chr16-68867259;