rs375721700

Positions:

• chr7-147121081-G-A

Variant summary

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

The NM_014141.6(CNTNAP2):​c.857G>A​(p.Arg286Gln) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.0000353 in 1,614,006 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R286W) has been classified as Uncertain significance.

• Frequency:
  • Genomes: 𝑓 0.000046 (0 hom., cov: 33)
  • Exomes 𝑓: 0.000034 (0 hom.)
• Consequence: CNTNAP2 NM_014141.6 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 8.00

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]

ACMG classification

Verdict is Uncertain_significance. Variant got 2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
CNTNAP2	NM_014141.6	c.857G>A	p.Arg286Gln	missense_variant	6/24	ENST00000361727.8
CNTNAP2	XM_017011950.3	c.857G>A	p.Arg286Gln	missense_variant	6/14

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
CNTNAP2	ENST00000361727.8	c.857G>A	p.Arg286Gln	missense_variant	6/24	1	NM_014141.6	P1

Frequencies

GnomAD3 genomes AF: 0.0000460 AC: 7 AN: 152170 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.00

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.0000655

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.000386

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.0000441

Gnomad OTH AF: 0.000478

GnomAD3 exomes AF: 0.0000478 AC: 12 AN: 251218 Hom.: 0 AF XY: 0.0000516 AC XY: 7 AN XY: 135768

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.00

Gnomad ASJ exome AF: 0.00

Gnomad EAS exome AF: 0.000326

Gnomad SAS exome AF: 0.0000327

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000352

Gnomad OTH exome AF: 0.000163

GnomAD4 exome AF: 0.0000342 AC: 50 AN: 1461836 Hom.: 0 Cov.: 31 AF XY: 0.0000275 AC XY: 20 AN XY: 727210

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.000277

Gnomad4 SAS exome AF: 0.0000580

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000234

Gnomad4 OTH exome AF: 0.000116

GnomAD4 genome AF: 0.0000460 AC: 7 AN: 152170 Hom.: 0 Cov.: 33 AF XY: 0.0000404 AC XY: 3 AN XY: 74340

Gnomad4 AFR AF: 0.00

Gnomad4 AMR AF: 0.0000655

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.000386

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.0000441

Gnomad4 OTH AF: 0.000478

Alfa AF: 0.0000565 Hom.: 0

Bravo AF: 0.0000491

ESP6500AA AF: 0.00 AC: 0

ESP6500EA AF: 0.000116 AC: 1

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

Cortical dysplasia-focal epilepsy syndrome Uncertain:2

Uncertain significance, criteria provided, single submitter	clinical testing	Invitae	Oct 17, 2022	This sequence change replaces arginine, which is basic and polar, with glutamine, which is neutral and polar, at codon 286 of the CNTNAP2 protein (p.Arg286Gln). This variant is present in population databases (rs375721700, gnomAD 0.04%). This variant has not been reported in the literature in individuals affected with CNTNAP2-related conditions. ClinVar contains an entry for this variant (Variation ID: 205227). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Possibly Damaging"; Align-GVGD: "Class C0"). 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. -
Uncertain significance, criteria provided, single submitter	clinical testing	Revvity Omics, Revvity	Aug 26, 2021	- -

not specified Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jan 02, 2015

p.Arg286Gln (CGG>CAG): c.857 G>A in exon 6 of the CNTNAP2 gene (NM_014141.5). The R286Q variant has not been published as a mutation, nor has it been reported as a benign polymorphism to our knowledge. The R286Q variant was not observed with any significant frequency in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The R286Q variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved across species. However, in silico analysis is inconsistent in its predictions as to whether or not the variant is damaging to the protein structure/function. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic mutation or a rare benign variant. The variant is found in EPILEPSY panel(s). -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.16
BayesDel_addAF	Uncertain	0.052	T
BayesDel_noAF	Pathogenic	0.14
CADD	Pathogenic	32
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.20	T;T
Eigen	Pathogenic	0.80
Eigen_PC	Pathogenic	0.80
FATHMM_MKL	Uncertain	0.95	D
M_CAP	Benign	0.038	D
MetaRNN	Uncertain	0.74	D;D
MetaSVM	Uncertain	0.012	D
MutationAssessor	Uncertain	2.3	M;M
MutationTaster	Benign	1.0	D
PrimateAI	Benign	0.46	T
PROVEAN	Benign	-1.2	N;.
REVEL	Uncertain	0.54
Sift	Benign	0.088	T;.
Sift4G	Benign	0.14	T;.
Polyphen		0.99	D;D
Vest4		0.84
MVP		0.90
MPC		0.28
ClinPred		0.47	T
GERP RS		5.8
Varity_R		0.16
gMVP		0.53

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: rs375721700; hg19: chr7-146818173; COSMIC: COSV100668886;