chr7-148147587-G-A

Variant names:

• chr7-148147587-G-A
• rs758630057
• NM_014141.6:c.2651G>A

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BP4_Strong

The NM_014141.6(CNTNAP2):​c.2651G>A​(p.Arg884Gln) variant causes a missense change. The variant allele was found at a frequency of 0.000245 in 1,613,934 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

• Frequency:
  • Genomes: 𝑓 0.00047 (1 hom., cov: 32)
  • Exomes 𝑓: 0.00022 (1 hom.)
• Consequence: CNTNAP2 NM_014141.6 missense
• Clinical Significance: Conflicting classifications of pathogenicity criteria provided, conflicting classifications P:1 U:3 B:1
• Conservation: PhyloP100: 6.74

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 Likely_benign. Variant got -4 ACMG points.

• BP4: Computational evidence support a benign effect (MetaRNN=0.024938554).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
CNTNAP2	NM_014141.6	c.2651G>A	p.Arg884Gln	missense_variant	Exon 17 of 24	ENST00000361727.8	NP_054860.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
CNTNAP2	ENST00000361727.8	c.2651G>A	p.Arg884Gln	missense_variant	Exon 17 of 24	1	NM_014141.6	ENSP00000354778.3

Frequencies

GnomAD3 genomes AF: 0.000467 AC: 71 AN: 152052 Hom.: 1 Cov.: 32

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: 0.00500

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000235

Gnomad OTH AF: 0.00

GnomAD3 exomes AF: 0.000469 AC: 118 AN: 251456 Hom.: 1 AF XY: 0.000456 AC XY: 62 AN XY: 135896

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: 0.00434

Gnomad NFE exome AF: 0.000193

Gnomad OTH exome AF: 0.000326

GnomAD4 exome AF: 0.000222 AC: 325 AN: 1461882 Hom.: 1 Cov.: 32 AF XY: 0.000215 AC XY: 156 AN XY: 727240

Gnomad4 AFR exome AF: 0.0000299

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.0000383

Gnomad4 EAS exome AF: 0.0000252

Gnomad4 SAS exome AF: 0.00

Gnomad4 FIN exome AF: 0.00387

Gnomad4 NFE exome AF: 0.0000980

Gnomad4 OTH exome AF: 0.0000993

GnomAD4 genome AF: 0.000467 AC: 71 AN: 152052 Hom.: 1 Cov.: 32 AF XY: 0.000633 AC XY: 47 AN XY: 74268

Gnomad4 AFR AF: 0.0000483

Gnomad4 AMR AF: 0.00

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00500

Gnomad4 NFE AF: 0.000235

Gnomad4 OTH AF: 0.00

Alfa AF: 0.000229 Hom.: 0

Bravo AF: 0.0000567

ExAC AF: 0.000239 AC: 29

EpiCase AF: 0.00

EpiControl AF: 0.000237

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Pathogenic:1 Uncertain:3 Benign:1

Revision: criteria provided, conflicting classifications

Submissions by phenotype

Cortical dysplasia-focal epilepsy syndrome Uncertain:1 Benign:1

Dec 07, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 13, 2018

Illumina Laboratory Services, Illumina

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease. -

Self-limited epilepsy with centrotemporal spikes Pathogenic:1

Jan 01, 2017

Bioinformatics Core, Luxembourg Center for Systems Biomedicine

Significance: Pathogenic

Review Status: no assertion criteria provided

Collection Method: case-control

CAADphred>15 -

not specified Uncertain:1

Dec 19, 2016

Genetic Services Laboratory, University of Chicago

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Uncertain:1

May 25, 2018

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The R884Q variant has not been published as a pathogenic variant, nor has it been reported as a benign polymorphism to our knowledge. It was not observed 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 R884Q variant is a semi-conservative amino acid substitution, which may impact secondary protein structure as these residues differ in some properties. The variant alters a position that is conserved through mammals; however, Glutamine is observed at this position in more distantly related species. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.092
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Uncertain	-0.050
CADD	Pathogenic	27
DANN	Pathogenic	1.0
DEOGEN2	Benign	0.14	T;T
Eigen	Uncertain	0.21
Eigen_PC	Uncertain	0.35
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Benign	0.73	.;T
M_CAP	Benign	0.028	D
MetaRNN	Benign	0.025	T;T
MetaSVM	Benign	-0.55	T
MutationAssessor	Benign	1.7	L;L
PrimateAI	Uncertain	0.60	T
PROVEAN	Benign	-0.54	N;.
REVEL	Uncertain	0.40
Sift	Benign	0.26	T;.
Sift4G	Benign	0.23	T;.
Polyphen		0.53	P;P
Vest4		0.64
MVP		0.86
MPC		0.26
ClinPred		0.13	T
GERP RS		5.3
Varity_R		0.14
gMVP		0.43

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: rs758630057; hg19: chr7-147844679; COSMIC: COSV62243026;