16-68737371-C-T

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_004360.5(CDH1):c.-45C>T variant causes a 5 prime UTR change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000657 in 152,234 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★★).

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: CDH1 NM_004360.5 5_prime_UTR
• Clinical Significance: Uncertain significance reviewed by expert panel U:2
• Conservation: PhyloP100: -0.427

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 Likely_benign. Variant got -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.59).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CDH1	NM_004360.5	c.-45C>T		5_prime_UTR_variant	1/16	ENST00000261769.10
CDH1	NM_001317184.2	c.-45C>T		5_prime_UTR_variant	1/15
CDH1	NM_001317185.2	c.-1660C>T		5_prime_UTR_variant	1/16
CDH1	NM_001317186.2	c.-1864C>T		5_prime_UTR_variant	1/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CDH1	ENST00000261769.10	c.-45C>T		5_prime_UTR_variant	1/16	1	NM_004360.5	P1
CDH1	ENST00000422392.6	c.-45C>T		5_prime_UTR_variant	1/15	1
CDH1	ENST00000566612.5	c.-45C>T		5_prime_UTR_variant, NMD_transcript_variant	1/15	1
CDH1	ENST00000566510.5	c.-45C>T		5_prime_UTR_variant, NMD_transcript_variant	1/15	5

Frequencies

GnomAD3 genomes AF: 0.00000657 AC: 1 AN: 152234 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000241

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: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1362928 Hom.: 0 Cov.: 27 AF XY: 0.00 AC XY: 0 AN XY: 672918

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: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.00

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome AF: 0.00000657 AC: 1 AN: 152234 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 74384

Gnomad4 AFR AF: 0.0000241

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: 0.00

Gnomad4 OTH AF: 0.00

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: reviewed by expert panel

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jun 23, 2016

This variant is denoted CDH1 c.-45C>T, and describes a nucleotide substitution 45 base pairs upstream of the ATG translational start site in the 5' untranslated region (UTR). This variant was not observed in approximately 3,339 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, suggesting it is not a common benign variant in these populations. CDH1 c.-45C>T is not predicted to affect the Kozak consensus sequence or to affect splicing. Although this variant has not, to our knowledge, been published in the literature, nearby variant c.-49G>T has been shown through Luciferase reporter assays to contribute to a slight increase in promoter activity, while c.-54G>C significantly decreases (p = 0.003) promoter activity (Nakamura 2002, Chen 2013). Therefore, based on the currently available information, we consider CDH1 c.-45C>T to be a variant of unknown significance. -

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 21, 2023

The c.-45C>T variant does not meet any criteria codes. In summary, this variant meets criteria to be classified as a variant of uncertain significance based on ACMG/AMP criteria applied as specified by the CDH1 Variant Curation Expert Panel (Variant Interpretation Guidelines Version 3.1): None. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.59
Cadd	Benign	13
Dann	Benign	0.91

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

Other links and lift over

dbSNP: rs1064795133; hg19: chr16-68771274;