16-68822015-A-G

Position:

• chr16-68822015-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_001317186.2(CDH1):​c.-240A>G variant causes a 5 prime UTR premature start codon gain change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Uncertain significance (★★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: CDH1 NM_001317186.2 5_prime_UTR_premature_start_codon_gain
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 8.58

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 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CDH1	NM_004360.5	c.1726A>G	p.Thr576Ala	missense_variant	12/16	ENST00000261769.10	NP_004351.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CDH1	ENST00000261769.10	c.1726A>G	p.Thr576Ala	missense_variant	12/16	1	NM_004360.5	ENSP00000261769.4

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

May 03, 2016

This variant is denoted CDH1 c.1726A>G at the cDNA level, p.Thr576Ala (T576A) at the protein level, and results in the change of a Threonine to an Alanine (ACT>GCT). This variant has not, to our knowledge, been published in the literature as pathogenic or benign. CDH1 Thr576Ala was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, suggesting it is not a common benign variant in these populations. Since Threonine and Alanine differ in polarity, charge, size or other properties, this is considered a non-conservative amino acid substitution. CDH1 Thr576Ala occurs at a position that is conserved across species and is located in the Cadherin 4 domain (UniProt). In silico analyses predict that this variant is probably damaging to protein structure and function. Based on currently available evidence, it is unclear whether CDH1 Thr576Ala is a pathogenic or benign variant. We consider it to be a variant of uncertain significance. -

Hereditary diffuse gastric adenocarcinoma Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 20, 2023

In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C55"). ClinVar contains an entry for this variant (Variation ID: 421116). This variant has not been reported in the literature in individuals affected with CDH1-related conditions. This variant is not present in population databases (gnomAD no frequency). This sequence change replaces threonine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 576 of the CDH1 protein (p.Thr576Ala). -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 17, 2024

The p.T576A variant (also known as c.1726A>G), located in coding exon 12 of the CDH1 gene, results from an A to G substitution at nucleotide position 1726. The threonine at codon 576 is replaced by alanine, an amino acid with similar properties. This amino acid position is highly conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Based on the available evidence, the clinical significance of this variant remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.28
BayesDel_addAF	Uncertain	0.026	T
BayesDel_noAF	Benign	-0.20
CADD	Pathogenic	27
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.50	T;T;T;.;.
Eigen	Uncertain	0.62
Eigen_PC	Uncertain	0.62
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Uncertain	0.88	D;T;D;T;D
M_CAP	Uncertain	0.094	D
MetaRNN	Uncertain	0.59	D;D;D;D;D
MetaSVM	Uncertain	-0.14	T
MutationAssessor	Uncertain	2.8	M;.;.;.;.
PrimateAI	Benign	0.46	T
PROVEAN	Uncertain	-3.7	D;.;.;.;D
REVEL	Uncertain	0.33
Sift	Uncertain	0.0030	D;.;.;.;D
Sift4G	Uncertain	0.013	D;D;D;D;D
Polyphen		0.26	B;.;.;.;.
Vest4		0.81
MutPred		0.45		Loss of glycosylation at T576 (P = 0.0904);Loss of glycosylation at T576 (P = 0.0904);.;Loss of glycosylation at T576 (P = 0.0904);.;
MVP		0.89
MPC		0.27
ClinPred		0.93	D
GERP RS		5.6
Varity_R		0.30
gMVP		0.63

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: rs759536558; hg19: chr16-68855918;