2-47369539-C-A

Variant names:

• chr2-47369539-C-A
• rs746990000
• NM_002354.3:c.34C>A

Variant summary

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

The NM_002354.3(EPCAM):​c.34C>A​(p.Leu12Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. 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. L12V) has been classified as Uncertain significance.

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: EPCAM NM_002354.3 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 0.0250
• Publications: 2 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 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
EPCAM	NM_002354.3	c.34C>A	p.Leu12Met	missense_variant	Exon 1 of 9	ENST00000263735.9	NP_002345.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
EPCAM	ENST00000263735.9	c.34C>A	p.Leu12Met	missense_variant	Exon 1 of 9	1	NM_002354.3	ENSP00000263735.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1430938 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 709648

African (AFR) AF: 0.00 AC: 0 AN: 32442

American (AMR) AF: 0.00 AC: 0 AN: 39982

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25384

East Asian (EAS) AF: 0.00 AC: 0 AN: 38352

South Asian (SAS) AF: 0.00 AC: 0 AN: 81732

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 47894

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4556

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1101308

Other (OTH) AF: 0.00 AC: 0 AN: 59288

GnomAD4 genome Cov.: 32

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

May 29, 2015

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

In summary, this is a novel missense change with uncertain impact on protein function. It has been classified as a Variant of Uncertain Significance. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This variant has not been published in the literature and is not present in population databases. This sequence change replaces leucine with methionine at codon 12 of the EPCAM protein (p.Leu12Met). The leucine residue is weakly conserved and there is a small physicochemical difference between leucine and methionine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.17
BayesDel_addAF	Benign	-0.00011	T
BayesDel_noAF	Benign	-0.24
CADD	Benign	17
DANN	Benign	0.82
DEOGEN2	Benign	0.17	T;.
Eigen	Benign	0.067
Eigen_PC	Benign	-0.049
FATHMM_MKL	Benign	0.41	N
LIST_S2	Benign	0.32	T;T
M_CAP	Pathogenic	0.92	D
MetaRNN	Uncertain	0.44	T;T
MetaSVM	Benign	-0.35	T
MutationAssessor	Uncertain	2.4	M;.
PhyloP100		0.025
PrimateAI	Uncertain	0.68	T
PROVEAN	Benign	-0.84	N;N
REVEL	Uncertain	0.35
Sift	Benign	0.082	T;D
Sift4G	Benign	0.095	T;D
Polyphen		0.98	D;.
Vest4		0.39
MutPred		0.36		Gain of catalytic residue at L12 (P = 0.0238);Gain of catalytic residue at L12 (P = 0.0238);
MVP		0.64
MPC		0.027
ClinPred		0.46	T
GERP RS		2.9
PromoterAI		-0.079	Neutral
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.6
Varity_R		0.092
gMVP		0.53
Mutation Taster		=92/8	polymorphism

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

Other links and lift over

dbSNP: rs746990000; hg19: chr2-47596678;