7-148267125-A-G

Position:

• chr7-148267125-A-G

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 2P and 1B. PM2 BP4

The NM_014141.6(CNTNAP2):​c.3474A>G​(p.Ile1158Met) variant causes a missense, splice region change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000205 in 1,460,886 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/23 in silico tools predict a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 0.0000021 (0 hom.)
• Consequence: CNTNAP2 NM_014141.6 missense, splice_region
• Scores: Splicing: ADA: 0.5589
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 2.02

Genes affected

CNTNAP2 (HGNC:13830): (contactin associated protein 2) This gene encodes a member of the neurexin family which functions in the vertebrate nervous system as cell adhesion molecules and receptors. This protein, like other neurexin proteins, contains epidermal growth factor repeats and laminin G domains. In addition, it includes an F5/8 type C domain, discoidin/neuropilin- and fibrinogen-like domains, thrombospondin N-terminal-like domains and a putative PDZ binding site. This protein is localized at the juxtaparanodes of myelinated axons, and mediates interactions between neurons and glia during nervous system development and is also involved in localization of potassium channels within differentiating axons. This gene encompasses almost 1.5% of chromosome 7 and is one of the largest genes in the human genome. It is directly bound and regulated by forkhead box protein P2, a transcription factor related to speech and language development. This gene has been implicated in multiple neurodevelopmental disorders, including Gilles de la Tourette syndrome, schizophrenia, epilepsy, autism, ADHD and intellectual disability. [provided by RefSeq, Jul 2017]

CNTNAP2 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.3014239).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
CNTNAP2	NM_014141.6	c.3474A>G	p.Ile1158Met	missense_variant, splice_region_variant	21/24	ENST00000361727.8	NP_054860.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
CNTNAP2	ENST00000361727.8	c.3474A>G	p.Ile1158Met	missense_variant, splice_region_variant	21/24	1	NM_014141.6	ENSP00000354778.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 0.00000205 AC: 3 AN: 1460886 Hom.: 0 Cov.: 32 AF XY: 0.00000275 AC XY: 2 AN XY: 726800

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: 0.00000270

Gnomad4 OTH exome AF: 0.00

GnomAD4 genome Cov.: 32

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

Cortical dysplasia-focal epilepsy syndrome Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Oct 18, 2017

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. Algorithms developed to predict the effect of missense changes on protein structure and function do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). This variant has not been reported in the literature in individuals with CNTNAP2-related disease. This variant is not present in population databases (ExAC no frequency). This sequence change replaces isoleucine with methionine at codon 1158 of the CNTNAP2 protein (p.Ile1158Met). The isoleucine residue is highly conserved and there is a small physicochemical difference between isoleucine and methionine. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.11
BayesDel_addAF	Uncertain	0.10	D
BayesDel_noAF	Benign	-0.090
CADD	Benign	21
DANN	Uncertain	0.99
DEOGEN2	Benign	0.11	T;T;T
Eigen	Benign	0.16
Eigen_PC	Benign	0.21
FATHMM_MKL	Benign	0.68	D
LIST_S2	Benign	0.77	.;T;D
M_CAP	Benign	0.032	D
MetaRNN	Benign	0.30	T;T;T
MetaSVM	Benign	-0.57	T
MutationAssessor	Benign	0.68	N;N;.
PrimateAI	Uncertain	0.58	T
PROVEAN	Benign	0.25	N;.;.
REVEL	Uncertain	0.45
Sift	Benign	0.20	T;.;.
Sift4G	Benign	0.17	T;.;T
Polyphen		0.95	P;P;.
Vest4		0.69
MutPred		0.55		Loss of methylation at K1156 (P = 0.0714);Loss of methylation at K1156 (P = 0.0714);.;
MVP		0.80
MPC		0.37
ClinPred		0.78	D
GERP RS		4.4
Varity_R		0.11
gMVP		0.27

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.56
dbscSNV1_RF	Benign	0.58
SpliceAI score (max)		0.020		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: rs1554409689; hg19: chr7-147964217;