rs2229867

Positions:

chr1-205059589-G-A

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 3P and 7B. PM2PP2BP4_ModerateBP6BS1

The NM_005076.5(CNTN2):c.704G>A(p.Arg235Gln) variant causes a missense change. The variant allele was found at a frequency of 0.0000489 in 1,613,982 control chromosomes in the GnomAD database, including 1 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R235W) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000049 ( 1 hom. )

Consequence

CNTN2
NM_005076.5 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:1B:1

Conservation

PhyloP100: 6.97

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 Likely_benign. Variant got -4 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=0.13890278).

BP6

Variant 1-205059589-G-A is Benign according to our data. Variant chr1-205059589-G-A is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 474489.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Uncertain_significance=1}.

BS1

Variant frequency is greater than expected in population eas. gnomad4 allele frequency = 0.0000526 (8/152110) while in subpopulation EAS AF= 0.00116 (6/5184). AF 95% confidence interval is 0.000503. There are 0 homozygotes in gnomad4. There are 3 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CNTN2	NM_005076.5 linkuse as main transcript	c.704G>A	p.Arg235Gln	missense_variant	7/23	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.704G>A	p.Arg235Gln	missense_variant	7/23	1	NM_005076.5	ENSP00000330633.4		Q02246

Frequencies

GnomAD3 genomes

AF:

0.0000526

AC:

AN:

152110

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00116

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.000188

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000139

AC:

AN:

251430

Hom.:

AF XY:

0.0000957

AC XY:

AN XY:

135876

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000578

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00120

Gnomad SAS exome

AF:

0.0000327

Gnomad FIN exome

AF:

0.000416

Gnomad NFE exome

AF:

0.00000879

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000486

AC:

AN:

1461872

Hom.:

Cov.:

AF XY:

0.0000358

AC XY:

AN XY:

727236

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000447

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.000554

Gnomad4 SAS exome

AF:

0.0000348

Gnomad4 FIN exome

AF:

0.000281

Gnomad4 NFE exome

AF:

0.0000243

Gnomad4 OTH exome

AF:

0.0000166

GnomAD4 genome

AF:

0.0000526

AC:

AN:

152110

Hom.:

Cov.:

AF XY:

0.0000404

AC XY:

AN XY:

74288

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00116

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.000188

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000847

Hom.:

Bravo

AF:

0.0000567

ExAC

AF:

0.0000741

AC:

EpiCase

AF:

0.000164

EpiControl

AF:

0.00

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:1Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Dec 15, 2023

The c.704G>A (p.R235Q) alteration is located in exon 7 (coding exon 6) of the CNTN2 gene. This alteration results from a G to A substitution at nucleotide position 704, causing the arginine (R) at amino acid position 235 to be replaced by a glutamine (Q). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Epilepsy, familial adult myoclonic, 5

Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Aug 03, 2023

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.095

BayesDel_addAF

Benign

-0.21

BayesDel_noAF

Uncertain

-0.080

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.12

T;T;.

Eigen

Uncertain

0.63

Eigen_PC

Uncertain

0.65

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Uncertain

0.96

.;.;D

M_CAP

Benign

0.042

MetaRNN

Benign

0.14

T;T;T

MetaSVM

Benign

-0.73

MutationAssessor

Uncertain

2.1

M;M;.

PrimateAI

Uncertain

0.55

PROVEAN

Benign

-1.1

.;N;.

REVEL

Benign

0.20

Sift

Benign

0.28

.;T;.

Sift4G

Benign

0.14

.;T;.

Polyphen

1.0

D;D;.

Vest4

0.87

MutPred

0.57

Loss of methylation at R235 (P = 0.0268);Loss of methylation at R235 (P = 0.0268);Loss of methylation at R235 (P = 0.0268);

MVP

0.86

MPC

1.1

ClinPred

0.68

GERP RS

5.5

Varity_R

0.58

gMVP

0.65

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

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