12-40908481-A-C

Position:

• chr12-40908481-A-C

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_001843.4(CNTN1):​c.49A>C​(p.Thr17Pro) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000687 in 1,455,024 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.9e-7 (0 hom.)
• Consequence: CNTN1 NM_001843.4 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: -0.00800

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.19369236).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CNTN1	NM_001843.4	c.49A>C	p.Thr17Pro	missense_variant	2/24	ENST00000551295.7	NP_001834.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CNTN1	ENST00000551295.7	c.49A>C	p.Thr17Pro	missense_variant	2/24	1	NM_001843.4	ENSP00000447006.1

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD3 exomes AF: 0.00000399 AC: 1 AN: 250402 Hom.: 0 AF XY: 0.00000739 AC XY: 1 AN XY: 135380

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.00000882

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 6.87e-7 AC: 1 AN: 1455024 Hom.: 0 Cov.: 28 AF XY: 0.00000138 AC XY: 1 AN XY: 724276

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 9.04e-7

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ExAC AF: 0.00000824 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Compton-North congenital myopathy Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 03, 2023

This sequence change replaces threonine, which is neutral and polar, with proline, which is neutral and non-polar, at codon 17 of the CNTN1 protein (p.Thr17Pro). This variant is present in population databases (rs773695120, gnomAD 0.0009%). This variant has not been reported in the literature in individuals affected with CNTN1-related conditions. ClinVar contains an entry for this variant (Variation ID: 2044129). 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	Benign	0.21
BayesDel_addAF	Benign	-0.092	T
BayesDel_noAF	Benign	-0.37
CADD	Benign	10
DANN	Benign	0.56
DEOGEN2	Uncertain	0.61	.;.;D;T;T;.;T;D;.
Eigen	Benign	-1.3
Eigen_PC	Benign	-1.3
FATHMM_MKL	Benign	0.023	N
LIST_S2	Benign	0.54	.;T;.;T;T;T;T;T;T
M_CAP	Benign	0.017	T
MetaRNN	Benign	0.19	T;T;T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Benign	0.0	N;.;N;.;.;N;.;N;N
PrimateAI	Benign	0.33	T
PROVEAN	Benign	-1.0	N;N;N;N;N;N;N;N;N
REVEL	Benign	0.087
Sift	Benign	0.21	T;T;T;T;T;T;T;T;T
Sift4G	Benign	0.23	T;D;T;D;D;T;D;T;T
Polyphen		0.10	B;.;B;.;.;B;.;B;B
Vest4		0.34
MutPred		0.56		Loss of glycosylation at T17 (P = 0.0549);Loss of glycosylation at T17 (P = 0.0549);Loss of glycosylation at T17 (P = 0.0549);Loss of glycosylation at T17 (P = 0.0549);Loss of glycosylation at T17 (P = 0.0549);Loss of glycosylation at T17 (P = 0.0549);Loss of glycosylation at T17 (P = 0.0549);Loss of glycosylation at T17 (P = 0.0549);Loss of glycosylation at T17 (P = 0.0549);
MVP		0.83
MPC		0.39
ClinPred		0.035	T
GERP RS		-5.9
Varity_R		0.14
gMVP		0.78

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

Other links and lift over

dbSNP: rs773695120; hg19: chr12-41302283;