chr2-47377045-C-G

Variant names:

• chr2-47377045-C-G
• rs878854491
• NM_002354.3:c.523C>G

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_002354.3(EPCAM):​c.523C>G​(p.Gln175Glu) 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. 16/22 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. Q175R) has been classified 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: 1.50
• Publications: 1 publications found

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]

EPCAM Gene-Disease associations (from GenCC):

• Lynch syndrome

  Inheritance: AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet
• Lynch syndrome 8

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Ambry Genetics, G2P, Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• congenital diarrhea 5 with tufting enteropathy

  Inheritance: AR Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), PanelApp Australia, Orphanet, G2P, Ambry Genetics
• hereditary breast carcinoma

  Inheritance: AD Classification: NO_KNOWN Submitted by: ClinGen

ACMG classification

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.12297693).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
EPCAM	NM_002354.3	c.523C>G	p.Gln175Glu	missense_variant	Exon 5 of 9	ENST00000263735.9	NP_002345.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
EPCAM	ENST00000263735.9	c.523C>G	p.Gln175Glu	missense_variant	Exon 5 of 9	1	NM_002354.3	ENSP00000263735.4
EPCAM	ENST00000405271.5	c.607C>G	p.Gln203Glu	missense_variant	Exon 6 of 10	5		ENSP00000385476.1
EPCAM	ENST00000456133.5	n.607C>G		non_coding_transcript_exon_variant	Exon 6 of 11	5		ENSP00000410675.1
EPCAM	ENST00000490733.1	n.372C>G		non_coding_transcript_exon_variant	Exon 3 of 6	3

Frequencies

GnomAD3 genomes Cov.: 31

GnomAD4 exome Cov.: 28

GnomAD4 genome Cov.: 31

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Hereditary cancer-predisposing syndrome Uncertain:1

Nov 02, 2023

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The p.Q175E variant (also known as c.523C>G), located in coding exon 5 of the EPCAM gene, results from a C to G substitution at nucleotide position 523. The glutamine at codon 175 is replaced by glutamic acid, an amino acid with highly similar 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	-0.10	T
BayesDel_noAF	Benign	-0.39
CADD	Benign	11
DANN	Benign	0.51
DEOGEN2	Benign	0.048	T;T
Eigen	Benign	-0.51
Eigen_PC	Benign	-0.49
FATHMM_MKL	Benign	0.21	N
LIST_S2	Benign	0.51	.;T
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.12	T;T
MetaSVM	Benign	-0.86	T
MutationAssessor	Uncertain	2.5	.;M
PhyloP100		1.5
PrimateAI	Benign	0.36	T
PROVEAN	Benign	-1.4	N;N
REVEL	Benign	0.073
Sift	Benign	0.22	T;T
Sift4G	Benign	0.68	T;T
Polyphen		0.15	B;B
Vest4		0.35
MutPred		0.28		Gain of loop (P = 0.0312);.;
MVP		0.51
MPC		0.014
ClinPred		0.084	T
GERP RS		4.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.1
Varity_R		0.15
gMVP		0.24
Mutation Taster		=91/9	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs878854491; hg19: chr2-47604184;