chr1-205064448-C-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BS1_Supporting

The NM_005076.5(CNTN2):c.1367C>T(p.Thr456Met) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.000248 in 1,610,842 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. T456T) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.000099 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00026 ( 0 hom. )

Consequence

CNTN2
NM_005076.5 missense

Scores

Clinical Significance

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

Conservation

PhyloP100: 7.52

Publications

1 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: Likely_benign. The variant received -1 ACMG points.

BS1

Variant frequency is greater than expected in population nfe. GnomAd4 allele frequency = 0.0000986 (15/152134) while in subpopulation NFE AF = 0.000191 (13/68014). AF 95% confidence interval is 0.000112. There are 0 homozygotes in GnomAd4. There are 5 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005076.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
CNTN2	NM_005076.5	MANE Select	c.1367C>T	p.Thr456Met	missense	Exon 11 of 23	NP_005067.1
CNTN2	NM_001346083.2		c.1367C>T	p.Thr456Met	missense	Exon 11 of 23	NP_001333012.1
CNTN2	NR_144350.2		n.1636C>T		non_coding_transcript_exon	Exon 11 of 23

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
CNTN2	ENST00000331830.7	TSL:1 MANE Select	c.1367C>T	p.Thr456Met	missense	Exon 11 of 23	ENSP00000330633.4
CNTN2	ENST00000640428.1	TSL:5	c.1367C>T	p.Thr456Met	missense	Exon 11 of 23	ENSP00000491474.1
CNTN2	ENST00000853779.1		c.1418C>T	p.Thr473Met	missense	Exon 12 of 24	ENSP00000523838.1

Frequencies

GnomAD3 genomes

AF:

0.0000986

AC:

AN:

152134

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000483

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000191

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000597

AC:

AN:

251104

AF XY:

0.0000737

show subpopulations

Gnomad AFR exome

AF:

0.000185

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000106

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.000264

AC:

385

AN:

1458708

Hom.:

Cov.:

AF XY:

0.000247

AC XY:

179

AN XY:

724956

show subpopulations

African (AFR)

AF:

0.000209

AC:

AN:

33428

American (AMR)

AF:

0.00

AC:

AN:

44648

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26110

East Asian (EAS)

AF:

0.0000253

AC:

AN:

39596

South Asian (SAS)

AF:

0.00

AC:

AN:

86156

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53402

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5752

European-Non Finnish (NFE)

AF:

0.000334

AC:

370

AN:

1109414

Other (OTH)

AF:

0.000116

AC:

AN:

60202

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.470

Heterozygous variant carriers

120

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

110

<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:

0.0000986

AC:

AN:

152134

Hom.:

Cov.:

AF XY:

0.0000673

AC XY:

AN XY:

74316

show subpopulations

African (AFR)

AF:

0.0000483

AC:

AN:

41428

American (AMR)

AF:

0.00

AC:

AN:

15288

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5166

South Asian (SAS)

AF:

0.00

AC:

AN:

4824

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.000191

AC:

AN:

68014

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.488

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<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:

0.000211

Hom.:

Bravo

AF:

0.000113

ExAC

AF:

0.0000247

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.000119

ClinVar

ClinVar submissions as Germline

Significance:Uncertain significance

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

Epilepsy, familial adult myoclonic, 5 (1)

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.18

BayesDel_addAF

Uncertain

0.045

BayesDel_noAF

Uncertain

0.11

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.37

Eigen

Pathogenic

0.84

Eigen_PC

Pathogenic

0.80

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Pathogenic

0.97

M_CAP

Uncertain

0.094

MetaRNN

Uncertain

0.73

MetaSVM

Uncertain

0.35

MutationAssessor

Benign

1.4

PhyloP100

7.5

PrimateAI

Uncertain

0.58

PROVEAN

Uncertain

-3.2

REVEL

Pathogenic

0.68

Sift

Benign

0.032

Sift4G

Uncertain

0.022

Polyphen

1.0

Vest4

0.86

MVP

0.95

MPC

1.3

ClinPred

0.47

GERP RS

5.3

Varity_R

0.12

gMVP

0.28

Mutation Taster

=75/25

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

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over