2-47377055-C-G

Position:

• chr2-47377055-C-G

Variant summary

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

The NM_002354.3(EPCAM):​c.533C>G​(p.Pro178Arg) 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. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency: Genomes: not found (cov: 31)
• Consequence: EPCAM NM_002354.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -1.97

Genes affected

EPCAM (HGNC:11529): (epithelial cell adhesion molecule) This gene encodes a carcinoma-associated antigen and is a member of a family that includes at least two type I membrane proteins. This antigen is expressed on most normal epithelial cells and gastrointestinal carcinomas and functions as a homotypic calcium-independent cell adhesion molecule. The antigen is being used as a target for immunotherapy treatment of human carcinomas. Mutations in this gene result in congenital tufting enteropathy. [provided by RefSeq, Dec 2008]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM1: In a chain Epithelial cell adhesion molecule (size 290) in uniprot entity EPCAM_HUMAN there are 12 pathogenic changes around while only 2 benign (86%) in NM_002354.3
• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.108897).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
EPCAM	NM_002354.3	c.533C>G	p.Pro178Arg	missense_variant	5/9	ENST00000263735.9	NP_002345.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
EPCAM	ENST00000263735.9	c.533C>G	p.Pro178Arg	missense_variant	5/9	1	NM_002354.3	ENSP00000263735.4
EPCAM	ENST00000405271.5	c.617C>G	p.Pro206Arg	missense_variant	6/10	5		ENSP00000385476.1
EPCAM	ENST00000456133.5	n.617C>G		non_coding_transcript_exon_variant	6/11	5		ENSP00000410675.1
EPCAM	ENST00000490733.1	n.382C>G		non_coding_transcript_exon_variant	3/6	3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 31

Bravo AF: 0.0000151

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Sep 22, 2023

The p.P178R variant (also known as c.533C>G), located in coding exon 5 of the EPCAM gene, results from a C to G substitution at nucleotide position 533. The proline at codon 178 is replaced by arginine, an amino acid with dissimilar properties. This amino acid position is conserved. 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	0.11
BayesDel_addAF	Benign	-0.17	T
BayesDel_noAF	Benign	-0.49
CADD	Benign	3.1
DANN	Benign	0.54
DEOGEN2	Benign	0.029	T;T
Eigen	Benign	-0.86
Eigen_PC	Benign	-0.88
FATHMM_MKL	Benign	0.023	N
LIST_S2	Benign	0.52	.;T
M_CAP	Benign	0.016	T
MetaRNN	Benign	0.11	T;T
MetaSVM	Benign	-0.84	T
MutationAssessor	Benign	1.6	.;L
PrimateAI	Benign	0.31	T
PROVEAN	Benign	-2.0	N;N
REVEL	Benign	0.064
Sift	Benign	0.11	T;T
Sift4G	Benign	0.24	T;T
Polyphen		0.0030	B;B
Vest4		0.20
MutPred		0.46		Gain of loop (P = 0.0111);.;
MVP		0.39
MPC		0.013
ClinPred		0.071	T
GERP RS		0.88
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.079
gMVP		0.29

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: rs772471530; hg19: chr2-47604194;