rs149814483

Positions:

chr1-205072079-C-T

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 3P and 2B. PM2PP2BP4BS1_Supporting

The NM_005076.5(CNTN2):c.2677C>T(p.Arg893Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000121 in 1,613,808 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts 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. R893Q) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00012 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00012 ( 0 hom. )

Consequence

CNTN2
NM_005076.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.907

Variant links:

Genes affected

CNTN2 (HGNC:2172): (contactin 2) This gene encodes a member of the contactin family of proteins, part of the immunoglobulin superfamily of cell adhesion molecules. The encoded glycosylphosphatidylinositol (GPI)-anchored neuronal membrane protein plays a role in the proliferation, migration, and axon guidance of neurons of the developing cerebellum. A mutation in this gene may be associated with adult myoclonic epilepsy. [provided by RefSeq, Sep 2016]

CNTN2 links:

CNTN2 (HGNC:):

CNTN2 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP2

Missense variant in gene, where missense usually causes diseases (based on misZ statistic), CNTN2. . Gene score misZ 2.5878 (greater than the threshold 3.09). Trascript score misZ 3.2882 (greater than threshold 3.09). GenCC has associacion of gene with benign adult familial myoclonic epilepsy, complex neurodevelopmental disorder, epilepsy, familial adult myoclonic, 5.

BP4

Computational evidence support a benign effect (MetaRNN=0.3453165).

BS1

Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.000125 (19/152172) while in subpopulation NFE AF= 0.000162 (11/68038). AF 95% confidence interval is 0.0000905. There are 0 homozygotes in gnomad4. There are 6 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CNTN2	NM_005076.5 linkuse as main transcript	c.2677C>T	p.Arg893Trp	missense_variant	20/23	ENST00000331830.7	NP_005067.1	Q02246A1ML24A1L3A3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CNTN2	ENST00000331830.7 linkuse as main transcript	c.2677C>T	p.Arg893Trp	missense_variant	20/23	1	NM_005076.5	ENSP00000330633.4		Q02246

Frequencies

GnomAD3 genomes

AF:

0.000125

AC:

AN:

152172

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000965

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000655

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000188

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000162

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000120

AC:

AN:

250932

Hom.:

AF XY:

0.0000959

AC XY:

AN XY:

135600

show subpopulations

Gnomad AFR exome

AF:

0.0000616

Gnomad AMR exome

AF:

0.000116

Gnomad ASJ exome

AF:

0.000299

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.0000925

Gnomad NFE exome

AF:

0.000168

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000120

AC:

176

AN:

1461636

Hom.:

Cov.:

AF XY:

0.000107

AC XY:

AN XY:

727148

show subpopulations

Gnomad4 AFR exome

AF:

0.0000597

Gnomad4 AMR exome

AF:

0.0000895

Gnomad4 ASJ exome

AF:

0.000230

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000696

Gnomad4 FIN exome

AF:

0.000356

Gnomad4 NFE exome

AF:

0.000118

Gnomad4 OTH exome

AF:

0.000116

GnomAD4 genome

AF:

0.000125

AC:

AN:

152172

Hom.:

Cov.:

AF XY:

0.0000807

AC XY:

AN XY:

74344

show subpopulations

Gnomad4 AFR

AF:

0.0000965

Gnomad4 AMR

AF:

0.0000655

Gnomad4 ASJ

AF:

0.000288

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000188

Gnomad4 NFE

AF:

0.000162

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000230

Hom.:

Bravo

AF:

0.0000907

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000233

AC:

ExAC

AF:

0.000115

AC:

EpiCase

AF:

0.00

EpiControl

AF:

0.0000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

May 21, 2024

The c.2677C>T (p.R893W) alteration is located in exon 20 (coding exon 19) of the CNTN2 gene. This alteration results from a C to T substitution at nucleotide position 2677, causing the arginine (R) at amino acid position 893 to be replaced by a tryptophan (W). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Epilepsy, familial adult myoclonic, 5

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Sep 19, 2022

This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 893 of the CNTN2 protein (p.Arg893Trp). This variant is present in population databases (rs149814483, gnomAD 0.03%). This variant has not been reported in the literature in individuals affected with CNTN2-related conditions. ClinVar contains an entry for this variant (Variation ID: 541412). Advanced modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) performed at Invitae indicates that this missense variant is not expected to disrupt CNTN2 protein function. 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. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.54

BayesDel_addAF

Benign

-0.18

BayesDel_noAF

Benign

-0.23

CADD

Uncertain

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.25

T;T;.

Eigen

Uncertain

0.35

Eigen_PC

Uncertain

0.24

FATHMM_MKL

Uncertain

0.82

LIST_S2

Uncertain

0.97

.;.;D

M_CAP

Benign

0.056

MetaRNN

Benign

0.35

T;T;T

MetaSVM

Uncertain

-0.027

MutationAssessor

Pathogenic

3.1

M;M;.

PrimateAI

Uncertain

0.73

PROVEAN

Benign

-1.9

.;N;.

REVEL

Uncertain

0.34

Sift

Uncertain

0.0060

.;D;.

Sift4G

Uncertain

0.0070

.;D;.

Polyphen

1.0

D;D;.

Vest4

0.64

MVP

0.87

MPC

1.3

ClinPred

0.55

GERP RS

-0.70

Varity_R

0.11

gMVP

0.71

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over