16-68738297-G-C

Position:

• chr16-68738297-G-C

Variant summary

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

The NM_004360.5(CDH1):​c.49G>C​(p.Val17Leu) variant causes a missense, splice region 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. 2/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: CDH1 NM_004360.5 missense, splice_region
• Scores: Splicing: ADA: 0.8578
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.09

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 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.49G>C	p.Val17Leu	missense_variant, splice_region_variant	2/16	ENST00000261769.10	NP_004351.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CDH1	ENST00000261769.10	c.49G>C	p.Val17Leu	missense_variant, splice_region_variant	2/16	1	NM_004360.5	ENSP00000261769.4
CDH1	ENST00000422392.6	c.49G>C	p.Val17Leu	missense_variant, splice_region_variant	2/15	1		ENSP00000414946.2
CDH1	ENST00000566612.5	n.49G>C		splice_region_variant, non_coding_transcript_exon_variant	2/15	1		ENSP00000454782.1
CDH1	ENST00000566510.5	n.49G>C		splice_region_variant, non_coding_transcript_exon_variant	2/15	5		ENSP00000458139.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary diffuse gastric adenocarcinoma Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Dec 27, 2016

This sequence change replaces valine with leucine at codon 17 of the CDH1 protein (p.Val17Leu). The valine residue is highly conserved and there is a small physicochemical difference between valine and leucine. This variant is not present in population databases (ExAC no frequency) and has not been reported in the literature in individuals with a CDH1-related disease. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0"). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may alter RNA splicing, but this prediction has not been confirmed by published transcriptional studies. In summary, this variant is a novel missense change with uncertain impact on mRNA splicing and protein function. It has been classified as a Variant of Uncertain Significance. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	-0.090	T
BayesDel_noAF	Benign	-0.37
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.42	T;T;T;.;.
Eigen	Benign	-0.17
Eigen_PC	Benign	-0.10
FATHMM_MKL	Uncertain	0.78	D
LIST_S2	Benign	0.78	T;T;T;T;T
M_CAP	Benign	0.044	D
MetaRNN	Benign	0.28	T;T;T;T;T
MetaSVM	Benign	-0.94	T
MutationAssessor	Uncertain	2.5	M;.;.;.;M
PrimateAI	Uncertain	0.49	T
PROVEAN	Benign	-1.1	N;.;.;.;N
REVEL	Benign	0.074
Sift	Uncertain	0.0080	D;.;.;.;D
Sift4G	Benign	0.15	T;T;T;T;T
Polyphen		0.056	B;.;.;.;.
Vest4		0.53
MutPred		0.58		Gain of helix (P = 0.132);Gain of helix (P = 0.132);Gain of helix (P = 0.132);Gain of helix (P = 0.132);Gain of helix (P = 0.132);
MVP		0.75
MPC		0.25
ClinPred		0.72	D
GERP RS		3.8
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.15
gMVP		0.25

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.86
dbscSNV1_RF	Pathogenic	0.78
SpliceAI score (max)		0.52		Details are displayed if max score is > 0.2
DS_AG_spliceai		0.52		Position offset: 21

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

Publications

LitVar

Other links and lift over

dbSNP: rs780470521; hg19: chr16-68772200;