16-68738340-G-C

Variant summary

Our verdict is Uncertain significance. Variant got 3 ACMG points: 3P and 0B. PM2 PP3

The NM_004360.5(CDH1):c.92G>C(p.Gly31Ala) variant causes a missense change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic 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. G31V) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: CDH1 NM_004360.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 4.71

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 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.817

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CDH1	NM_004360.5	c.92G>C	p.Gly31Ala	missense_variant	2/16	ENST00000261769.10
CDH1	NM_001317184.2	c.92G>C	p.Gly31Ala	missense_variant	2/15
CDH1	NM_001317185.2	c.-1524G>C		5_prime_UTR_variant	2/16
CDH1	NM_001317186.2	c.-1728G>C		5_prime_UTR_variant	2/15

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CDH1	ENST00000261769.10	c.92G>C	p.Gly31Ala	missense_variant	2/16	1	NM_004360.5	P1
CDH1	ENST00000422392.6	c.92G>C	p.Gly31Ala	missense_variant	2/15	1
CDH1	ENST00000566612.5	c.92G>C	p.Gly31Ala	missense_variant, NMD_transcript_variant	2/15	1
CDH1	ENST00000566510.5	c.92G>C	p.Gly31Ala	missense_variant, NMD_transcript_variant	2/15	5

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

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

Invitae

Dec 24, 2018

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: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with CDH1-related conditions. This variant is not present in population databases (ExAC no frequency). This sequence change replaces glycine with alanine at codon 31 of the CDH1 protein (p.Gly31Ala). The glycine residue is highly conserved and there is a small physicochemical difference between glycine and alanine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.30
BayesDel_addAF	Uncertain	0.056	T
BayesDel_noAF	Benign	-0.16
Cadd	Uncertain	23
Dann	Uncertain	0.98
DEOGEN2	Benign	0.31	T;T;T;.;.
Eigen	Uncertain	0.34
Eigen_PC	Uncertain	0.33
FATHMM_MKL	Uncertain	0.81	D
LIST_S2	Uncertain	0.88	D;D;D;D;D
M_CAP	Uncertain	0.11	D
MetaRNN	Pathogenic	0.82	D;D;D;D;D
MetaSVM	Benign	-0.29	T
MutationAssessor	Uncertain	2.3	M;.;.;.;M
MutationTaster	Benign	1.0	D;D
PrimateAI	Benign	0.44	T
PROVEAN	Uncertain	-3.2	D;.;.;.;D
REVEL	Benign	0.28
Sift	Uncertain	0.015	D;.;.;.;D
Sift4G	Uncertain	0.060	T;T;T;T;T
Polyphen		0.20	B;.;.;.;.
Vest4		0.66
MutPred		0.64		Loss of disorder (P = 0.1448);Loss of disorder (P = 0.1448);Loss of disorder (P = 0.1448);Loss of disorder (P = 0.1448);Loss of disorder (P = 0.1448);
MVP		0.87
MPC		0.61
ClinPred		0.92	D
GERP RS		4.8
Varity_R		0.34
gMVP		0.65

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: rs1131690823; hg19: chr16-68772243;