16-68801883-C-G

Position:

• chr16-68801883-C-G

Variant summary

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

The NM_004360.5(CDH1):​c.377C>G​(p.Pro126Arg) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,461,282 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 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. P126Q) has been classified as Benign.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: CDH1 NM_004360.5 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 0.200

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 (MetaRNN=0.0622952).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CDH1	NM_004360.5	c.377C>G	p.Pro126Arg	missense_variant	3/16	ENST00000261769.10	NP_004351.1
CDH1	NM_001317184.2	c.377C>G	p.Pro126Arg	missense_variant	3/15		NP_001304113.1
CDH1	NM_001317185.2	c.-1239C>G		5_prime_UTR_variant	3/16		NP_001304114.1
CDH1	NM_001317186.2	c.-1443C>G		5_prime_UTR_variant	3/15		NP_001304115.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CDH1	ENST00000261769.10	c.377C>G	p.Pro126Arg	missense_variant	3/16	1	NM_004360.5	ENSP00000261769	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000399 AC: 1 AN: 250648 Hom.: 0 AF XY: 0.00000738 AC XY: 1 AN XY: 135538

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.0000289

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461282 Hom.: 0 Cov.: 32 AF XY: 0.00000138 AC XY: 1 AN XY: 726990

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.0000224

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: 9.00e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Hereditary diffuse gastric adenocarcinoma Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Nov 23, 2022

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 output the following: SIFT: "Tolerated"; PolyPhen-2: "Benign"; Align-GVGD: "Class C0". The arginine amino acid residue is found in multiple mammalian species, which suggests that this missense change does not adversely affect protein function. ClinVar contains an entry for this variant (Variation ID: 496231). This variant has not been reported in the literature in individuals affected with CDH1-related conditions. This variant is present in population databases (rs746703615, gnomAD 0.003%). This sequence change replaces proline, which is neutral and non-polar, with arginine, which is basic and polar, at codon 126 of the CDH1 protein (p.Pro126Arg). -

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Women's Health and Genetics/Laboratory Corporation of America, LabCorp

Jul 01, 2016

Variant summary: The CDH1 c.377C>G (p.Pro126Arg) variant involves the alteration of a non-conserved nucleotide. 2/4 in silico tools predict a benign outcome. This variant was found in 1/120398 control chromosomes, which is not high enough to rule out the pathogenicity. One internal sample also carried a BRCA2 pathogenic variant c.6025C>T/p.Q2009X, supporting the possible benign nature of this variant. In addition, one clinical diagnostic laboratory classified this variant as VUS, without evidence to independently evaluate. The variant of interest has not, to our knowledge, been reported in affected individuals via publication; nor evaluated for functional impact by in vivo/vitro studies. Taken together, this variant is classified as VUS until more information becomes available. -

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Jul 13, 2022

The p.P126R variant (also known as c.377C>G), located in coding exon 3 of the CDH1 gene, results from a C to G substitution at nucleotide position 377. The proline at codon 126 is replaced by arginine, an amino acid with dissimilar 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	0.060
BayesDel_addAF	Benign	-0.21	T
BayesDel_noAF	Benign	-0.46
CADD	Benign	0.063
DANN	Benign	0.27
DEOGEN2	Benign	0.35	T;T;T;.;.
Eigen	Benign	-1.7
Eigen_PC	Benign	-1.7
FATHMM_MKL	Benign	0.028	N
LIST_S2	Benign	0.52	T;T;T;T;T
M_CAP	Benign	0.011	T
MetaRNN	Benign	0.062	T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	1.1	L;.;.;.;L
MutationTaster	Benign	1.0	D;D
PrimateAI	Benign	0.24	T
PROVEAN	Benign	-0.51	N;.;.;.;N
REVEL	Benign	0.061
Sift	Benign	0.33	T;.;.;.;T
Sift4G	Benign	0.49	T;T;T;T;T
Polyphen		0.041	B;.;.;.;.
Vest4		0.21
MutPred		0.23		Loss of glycosylation at P126 (P = 0.0063);Loss of glycosylation at P126 (P = 0.0063);Loss of glycosylation at P126 (P = 0.0063);Loss of glycosylation at P126 (P = 0.0063);Loss of glycosylation at P126 (P = 0.0063);
MVP		0.46
MPC		0.27
ClinPred		0.036	T
GERP RS		-1.8
Varity_R		0.019
gMVP		0.091

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: rs746703615; hg19: chr16-68835786;