chr12-40908452-T-A

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 1 ACMG points: 2P and 1B. PM2BP4

The NM_001843.4(CNTN1):c.20T>A(p.Val7Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000137 in 1,460,694 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Synonymous variant affecting the same amino acid position (i.e. V7V) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 32)

Exomes 𝑓: 0.0000014 ( 0 hom. )

Consequence

CNTN1
NM_001843.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 1.82

Publications

0 publications found

Variant links:

Genes affected

CNTN1 (HGNC:2171): (contactin 1) The protein encoded by this gene is a member of the immunoglobulin superfamily. It is a glycosylphosphatidylinositol (GPI)-anchored neuronal membrane protein that functions as a cell adhesion molecule. It may play a role in the formation of axon connections in the developing nervous system. Multiple alternatively spliced transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Dec 2011]

CNTN1 Gene-Disease associations (from GenCC):

Compton-North congenital myopathy
Inheritance: AR Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Orphanet
schizophrenia
Inheritance: Unknown Classification: NO_KNOWN Submitted by: Labcorp Genetics (formerly Invitae)

CNTN1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 1 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.28591394).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CNTN1	NM_001843.4 link	c.20T>A	p.Val7Asp	missense_variant	Exon 2 of 24	ENST00000551295.7	NP_001834.2	Q12860-1A0A024R104

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CNTN1	ENST00000551295.7 link	c.20T>A	p.Val7Asp	missense_variant	Exon 2 of 24	1	NM_001843.4	ENSP00000447006.1		Q12860-1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD2 exomes

AF:

0.00000797

AC:

AN:

250820

AF XY:

0.0000147

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000580

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000137

AC:

AN:

1460694

Hom.:

Cov.:

AF XY:

0.00000275

AC XY:

AN XY:

726710

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

33446

American (AMR)

AF:

0.0000447

AC:

AN:

44708

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26122

East Asian (EAS)

AF:

0.00

AC:

AN:

39606

South Asian (SAS)

AF:

0.00

AC:

AN:

86186

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53154

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5716

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1111414

Other (OTH)

AF:

0.00

AC:

AN:

60342

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0.000000), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.400

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Compton-North congenital myopathy

Uncertain:1

May 03, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces valine, which is neutral and non-polar, with aspartic acid, which is acidic and polar, at codon 7 of the CNTN1 protein (p.Val7Asp). This variant is present in population databases (no rsID available, gnomAD 0.006%). This variant has not been reported in the literature in individuals affected with CNTN1-related conditions. 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 CNTN1 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

0.45

BayesDel_addAF

Benign

-0.074

BayesDel_noAF

Benign

-0.17

CADD

Benign

(source)

DANN

Benign

0.97

DEOGEN2

Uncertain

0.48

.;.;T;T;T;.;T;T;.

Eigen

Benign

-0.21

Eigen_PC

Benign

-0.052

FATHMM_MKL

Benign

0.76

LIST_S2

Uncertain

0.88

.;D;.;D;D;D;D;D;D

M_CAP

Benign

0.039

MetaRNN

Benign

0.29

T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.86

MutationAssessor

Benign

0.0

N;.;N;.;.;N;.;N;N

PhyloP100

1.8

PrimateAI

Benign

0.35

PROVEAN

Benign

-1.6

N;D;N;N;N;N;N;N;N

REVEL

Uncertain

0.29

Sift

Uncertain

0.013

D;D;D;D;D;D;D;D;D

Sift4G

Benign

0.21

T;D;T;D;D;T;D;T;T

Polyphen

0.43

B;.;B;.;.;B;.;B;B

Vest4

0.41

MutPred

0.56

Gain of disorder (P = 0.022);Gain of disorder (P = 0.022);Gain of disorder (P = 0.022);Gain of disorder (P = 0.022);Gain of disorder (P = 0.022);Gain of disorder (P = 0.022);Gain of disorder (P = 0.022);Gain of disorder (P = 0.022);Gain of disorder (P = 0.022);

MVP

0.64

MPC

0.52

ClinPred

0.24

GERP RS

4.9

PromoterAI

0.011

Neutral

(source)

Varity_R

0.27

gMVP

0.87

Mutation Taster

=79/21

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

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over