16-68833354-A-ATG

Position:

• chr16-68833354-A-ATG

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PVS1_Moderate PM2_Supporting

This summary comes from the ClinGen Evidence Repository: The c.2505_2506dupTG (p.Glu836ValfsTer11) variant results in a premature stop codon that leads to a truncated protein. It is located within the nonsense mediated decay resistant zone, and downstream of codon 836 where the most 3' pathogenic variant in CDH1 terminates (PVS1_Moderate, PMID:29798843). This variant is absent in the gnomAD cohort (PM2_Supporting; http://gnomad.broadinstitute.org). In summary, the clinical significance of this variant is uncertain based on the ACMG/AMP criteria applied as specified by the CDH1 Variant Curation Expert Panel: PVS1_Moderate, PM2_Supporting. LINK:https://erepo.genome.network/evrepo/ui/classification/CA658658500/MONDO:0007648/007

• Frequency: Genomes: not found (cov: 32)
• Consequence: CDH1 NM_004360.5 frameshift
• Clinical Significance: Uncertain significance reviewed by expert panel P:1 U:2
• Conservation: PhyloP100: -1.24

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 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 3 ACMG points.

• PVS1: 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/exons	MANE	Protein	UniProt
CDH1	NM_004360.5	c.2505_2506dupTG	p.Glu836fs	frameshift_variant	16/16	ENST00000261769.10	NP_004351.1
CDH1	NM_001317184.2	c.2322_2323dupTG	p.Glu775fs	frameshift_variant	15/15		NP_001304113.1
CDH1	NM_001317185.2	c.957_958dupTG	p.Glu320fs	frameshift_variant	16/16		NP_001304114.1
CDH1	NM_001317186.2	c.540_541dupTG	p.Glu181fs	frameshift_variant	15/15		NP_001304115.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CDH1	ENST00000261769.10	c.2505_2506dupTG	p.Glu836fs	frameshift_variant	16/16	1	NM_004360.5	ENSP00000261769.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1 Uncertain:2

Revision: reviewed by expert panel

Submissions by phenotype

Hereditary diffuse gastric adenocarcinoma Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Myriad Genetics, Inc.

Nov 20, 2023

This variant is considered likely pathogenic. This variant creates a frameshift predicted to result in premature protein truncation. -

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

Uncertain significance, reviewed by expert panel

curation

ClinGen CDH1 Variant Curation Expert Panel

Aug 04, 2023

The c.2505_2506dupTG (p.Glu836ValfsTer11) variant results in a premature stop codon that leads to a truncated protein. It is located within the nonsense mediated decay resistant zone, and downstream of codon 836 where the most 3' pathogenic variant in CDH1 terminates (PVS1_Moderate, PMID: 29798843). This variant is absent in the gnomAD cohort (PM2_Supporting; http://gnomad.broadinstitute.org). In summary, the clinical significance of this variant is uncertain based on the ACMG/AMP criteria applied as specified by the CDH1 Variant Curation Expert Panel: PVS1_Moderate, PM2_Supporting. -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 03, 2024

The c.2505_2506dupTG variant, located in coding exon 16 of the CDH1 gene, results from a duplication of TG at nucleotide position 2505, causing a translational frameshift with a predicted alternate stop codon (p.E836Vfs*11). Frameshifts are typically deleterious in nature, however, this frameshift 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 altered amino acids is unknown at this time. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Other links and lift over

dbSNP: rs1555518236; hg19: chr16-68867257;