chr16-68815557-G-T

Position:

• chr16-68815557-G-T

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The ENST00000261769.10(CDH1):​c.1363G>T​(p.Ala455Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 15/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A455T) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CDH1 ENST00000261769.10 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 0.00500

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]

(HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.13377798).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CDH1	NM_004360.5	c.1363G>T	p.Ala455Ser	missense_variant	10/16	ENST00000261769.10	NP_004351.1
CDH1	NM_001317184.2	c.1180G>T	p.Ala394Ser	missense_variant	9/15		NP_001304113.1
CDH1	NM_001317185.2	c.-186G>T		5_prime_UTR_variant	10/16		NP_001304114.1
CDH1	NM_001317186.2	c.-457G>T		5_prime_UTR_variant	10/15		NP_001304115.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CDH1	ENST00000261769.10	c.1363G>T	p.Ala455Ser	missense_variant	10/16	1	NM_004360.5	ENSP00000261769	P1
	ENST00000563916.1	n.347+19C>A		intron_variant, non_coding_transcript_variant		4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 32

GnomAD4 genome Cov.: 32

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

Quest Diagnostics Nichols Institute San Juan Capistrano

Jul 19, 2023

This variant has not been reported in individuals with CDH1-related conditions in the published literature. It also has not been reported in large, multi-ethnic general populations (Genome Aggregation Database, http://gnomad.broadinstitute.org). Analysis of this variant using bioinformatics tools for the prediction of the effect of amino acid changes on protein structure and function yielded predictions that this variant is benign. Based on the available information, we are unable to determine the clinical significance of this variant. -

Hereditary diffuse gastric adenocarcinoma Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 27, 2023

This sequence change replaces alanine, which is neutral and non-polar, with serine, which is neutral and polar, at codon 455 of the CDH1 protein (p.Ala455Ser). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with CDH1-related conditions. ClinVar contains an entry for this variant (Variation ID: 232433). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be tolerated. 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. -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Apr 20, 2023

The p.A455S variant (also known as c.1363G>T), located in coding exon 10 of the CDH1 gene, results from a G to T substitution at nucleotide position 1363. The alanine at codon 455 is replaced by serine, an amino acid with similar properties. This amino acid position is poorly conserved in available vertebrate species. In addition, this alteration is predicted to be tolerated by in silico analysis. Since supporting evidence is limited at this time, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.096
BayesDel_addAF	Benign	-0.28	T
BayesDel_noAF	Benign	-0.63
CADD	Benign	4.1
DANN	Benign	0.95
DEOGEN2	Benign	0.20	T;T;T;.;.
Eigen	Benign	-1.1
Eigen_PC	Benign	-1.1
FATHMM_MKL	Benign	0.096	N
LIST_S2	Benign	0.71	T;T;T;T;T
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.13	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.64	N;.;.;.;.
MutationTaster	Benign	1.0	N;N
PrimateAI	Benign	0.27	T
PROVEAN	Benign	-0.54	N;.;.;.;N
REVEL	Benign	0.059
Sift	Benign	0.17	T;.;.;.;T
Sift4G	Benign	0.78	T;T;T;T;T
Polyphen		0.0010	B;.;.;.;.
Vest4		0.16
MutPred		0.45		Gain of relative solvent accessibility (P = 0.1571);Gain of relative solvent accessibility (P = 0.1571);.;Gain of relative solvent accessibility (P = 0.1571);.;
MVP		0.55
MPC		0.25
ClinPred		0.33	T
GERP RS		-2.3
Varity_R		0.053
gMVP		0.25

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs876659762; hg19: chr16-68849460;