chr1-205058028-G-A

Variant names:

Variant summary

Our verdict is Benign. The variant received -20 ACMG points: 0P and 20B. BP4_StrongBP6_Very_StrongBS1BS2

The NM_005076.5(CNTN2):c.178G>A(p.Ala60Thr) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00209 in 1,613,400 control chromosomes in the GnomAD database, including 68 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Benign (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. A60V) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.012 ( 35 hom., cov: 32)

Exomes 𝑓: 0.0011 ( 33 hom. )

Consequence

CNTN2
NM_005076.5 missense

Scores

Clinical Significance

Benign criteria provided, multiple submitters, no conflicts B:2

Conservation

PhyloP100: 1.15

Publications

5 publications found

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 Gene-Disease associations (from GenCC):

complex neurodevelopmental disorder
Inheritance: AR Classification: DEFINITIVE Submitted by: ClinGen
epilepsy, familial adult myoclonic, 5
Inheritance: AR Classification: STRONG, LIMITED Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics
benign adult familial myoclonic epilepsy
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

CNTN2 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -20 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.0070005357).

BP6

Variant 1-205058028-G-A is Benign according to our data. Variant chr1-205058028-G-A is described in ClinVar as Benign. ClinVar VariationId is 474469.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BS1

Variant frequency is greater than expected in population afr. GnomAd4 allele frequency = 0.0117 (1775/152278) while in subpopulation AFR AF = 0.0406 (1686/41556). AF 95% confidence interval is 0.039. There are 35 homozygotes in GnomAd4. There are 841 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAd4 at 35 AR,AD gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CNTN2	NM_005076.5 link	c.178G>A	p.Ala60Thr	missense_variant	Exon 3 of 23	ENST00000331830.7	NP_005067.1	Q02246A1ML24A1L3A3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CNTN2	ENST00000331830.7 link	c.178G>A	p.Ala60Thr	missense_variant	Exon 3 of 23	1	NM_005076.5	ENSP00000330633.4		Q02246

Frequencies

GnomAD3 genomes

AF:

0.0116

AC:

1766

AN:

152160

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0405

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00386

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.000103

Gnomad OTH

AF:

0.0100

GnomAD2 exomes

AF:

0.00294

AC:

737

AN:

250328

AF XY:

0.00219

show subpopulations

Gnomad AFR exome

AF:

0.0422

Gnomad AMR exome

AF:

0.00127

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000265

Gnomad OTH exome

AF:

0.00115

GnomAD4 exome

AF:

0.00109

AC:

1590

AN:

1461122

Hom.:

Cov.:

AF XY:

0.000944

AC XY:

686

AN XY:

726842

show subpopulations

African (AFR)

AF:

0.0405

AC:

1353

AN:

33442

American (AMR)

AF:

0.00166

AC:

AN:

44668

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26110

East Asian (EAS)

AF:

0.00

AC:

AN:

39664

South Asian (SAS)

AF:

0.0000696

AC:

AN:

86180

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53268

Middle Eastern (MID)

AF:

0.00104

AC:

AN:

5762

European-Non Finnish (NFE)

AF:

0.0000162

AC:

AN:

1111692

Other (OTH)

AF:

0.00220

AC:

133

AN:

60336

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.484

Heterozygous variant carriers

179

269

358

448

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

132

176

220

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0117

AC:

1775

AN:

152278

Hom.:

Cov.:

AF XY:

0.0113

AC XY:

841

AN XY:

74458

show subpopulations

African (AFR)

AF:

0.0406

AC:

1686

AN:

41556

American (AMR)

AF:

0.00386

AC:

AN:

15304

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5176

South Asian (SAS)

AF:

0.000207

AC:

AN:

4830

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10630

Middle Eastern (MID)

AF:

0.00340

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000103

AC:

AN:

67990

Other (OTH)

AF:

0.00993

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.498

Heterozygous variant carriers

180

269

359

449

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.00466

Hom.:

Bravo

AF:

0.0133

ESP6500AA

AF:

0.0427

AC:

188

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.00380

AC:

461

Asia WGS

AF:

0.00144

AC:

AN:

3478

ClinVar

Significance: Benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:1

Breakthrough Genomics, Breakthrough Genomics

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:not provided

- -

Epilepsy, familial adult myoclonic, 5

Benign:1

Feb 02, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.70

BayesDel_noAF

Benign

-0.75

CADD

Benign

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.054

T;T;.

Eigen

Benign

-0.45

Eigen_PC

Benign

-0.18

FATHMM_MKL

Benign

0.53

LIST_S2

Benign

0.77

.;.;T

MetaRNN

Benign

0.0070

T;T;T

MetaSVM

Benign

-0.97

MutationAssessor

Benign

-1.2

N;N;.

PhyloP100

1.2

PrimateAI

Benign

0.34

PROVEAN

Benign

1.1

.;N;.

REVEL

Benign

0.055

Sift

Benign

0.14

.;T;.

Sift4G

Benign

1.0

.;T;.

Polyphen

0.0040

B;B;.

Vest4

0.094

MVP

0.61

MPC

0.41

ClinPred

0.012

GERP RS

5.4

Varity_R

0.12

gMVP

0.40

Mutation Taster

=81/19

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over