chr16-68808787-G-A

Position:

• chr16-68808787-G-A

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1 PM2 BP4_Moderate

The NM_004360.5(CDH1):​c.626G>A​(p.Arg209Lys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,856 control chromosomes in the GnomAD database, with no homozygous occurrence. 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 (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: CDH1 NM_004360.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 1.76

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.

• PM1: In a domain Cadherin 1 (size 107) in uniprot entity CADH1_HUMAN there are 11 pathogenic changes around while only 4 benign (73%) in NM_004360.5
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.13013211).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CDH1	NM_004360.5	c.626G>A	p.Arg209Lys	missense_variant	5/16	ENST00000261769.10	NP_004351.1
CDH1	NM_001317184.2	c.626G>A	p.Arg209Lys	missense_variant	5/15		NP_001304113.1
CDH1	NM_001317185.2	c.-990G>A		5_prime_UTR_variant	5/16		NP_001304114.1
CDH1	NM_001317186.2	c.-1194G>A		5_prime_UTR_variant	5/15		NP_001304115.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CDH1	ENST00000261769.10	c.626G>A	p.Arg209Lys	missense_variant	5/16	1	NM_004360.5	ENSP00000261769	P1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461856 Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0 AN XY: 727228

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

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: 8.99e-7

Gnomad4 OTH exome AF: 0.00

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 04, 2016

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. In summary, this variant is a novel missense change that is not predicted to affect protein function. There is no indication that it causes disease, but the available evidence is currently insufficient to prove that conclusively. 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 (SIFT, PolyPhen-2, Align-GVGD) all suggest that this variant is likely to be tolerated, but these predictions have not been confirmed by published functional studies. This sequence change replaces arginine with lysine at codon 209 of the CDH1 protein (p.Arg209Lys). The arginine residue is highly conserved and there is a small physicochemical difference between arginine and lysine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.12
BayesDel_addAF	Benign	-0.13	T
BayesDel_noAF	Benign	-0.42
CADD	Benign	21
DANN	Benign	0.92
DEOGEN2	Benign	0.18	T;T;T;.;.
Eigen	Benign	-0.24
Eigen_PC	Benign	-0.031
FATHMM_MKL	Uncertain	0.84	D
LIST_S2	Benign	0.50	T;T;T;T;T
M_CAP	Benign	0.0091	T
MetaRNN	Benign	0.13	T;T;T;T;T
MetaSVM	Benign	-1.1	T
MutationAssessor	Benign	0.59	N;.;.;.;N
MutationTaster	Benign	1.0	D;D
PrimateAI	Uncertain	0.51	T
PROVEAN	Benign	-0.45	N;.;.;.;N
REVEL	Benign	0.054
Sift	Benign	0.83	T;.;.;.;T
Sift4G	Benign	0.89	T;T;T;T;T
Polyphen		0.10	B;.;.;.;.
Vest4		0.14
MutPred		0.54		Gain of ubiquitination at R209 (P = 0.0267);Gain of ubiquitination at R209 (P = 0.0267);Gain of ubiquitination at R209 (P = 0.0267);Gain of ubiquitination at R209 (P = 0.0267);Gain of ubiquitination at R209 (P = 0.0267);
MVP		0.84
MPC		0.26
ClinPred		0.33	T
GERP RS		4.8
Varity_R		0.39
gMVP		0.41

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: rs1060501243; hg19: chr16-68842690;