2-50538612-C-T

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 1 ACMG points: 1P and 0B. PP3

The NM_001330078.2(NRXN1):c.1784G>A(p.Arg595His) variant causes a missense change involving the alteration of a conserved nucleotide. The variant allele was found at a frequency of 0.00000801 in 1,498,704 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic outcome for this variant. 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. R595C) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000082 ( 0 hom. )

Consequence

NRXN1
NM_001330078.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:4

Conservation

PhyloP100: 7.91

Variant links:

Genes affected

NRXN1 (HGNC:8008): (neurexin 1) This gene encodes a single-pass type I membrane protein that belongs to the neurexin family. Neurexins are cell-surface receptors that bind neuroligins to form Ca(2+)-dependent neurexin/neuroligin complexes at synapses in the central nervous system. This complex is required for efficient neurotransmission and is involved in the formation of synaptic contacts. Three members of this gene family have been studied in detail and are estimated to generate over 3,000 variants through the use of two alternative promoters (alpha and beta) and extensive alternative splicing in each family member. Recently, a third promoter (gamma) was identified for this gene in the 3' region. Mutations in this gene are associated with Pitt-Hopkins-like syndrome-2 and may contribute to susceptibility to schizophrenia. [provided by RefSeq, Aug 2016]

NRXN1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 1 ACMG points.

PP3

MetaRNN computational evidence supports a deleterious effect, 0.745

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NRXN1	NM_001330078.2 link	c.1784G>A	p.Arg595His	missense_variant	Exon 10 of 23	ENST00000401669.7	NP_001317007.1	E7ERL8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NRXN1	ENST00000401669.7 link	c.1784G>A	p.Arg595His	missense_variant	Exon 10 of 23	5	NM_001330078.2	ENSP00000385017.2		E7ERL8

Frequencies

GnomAD3 genomes

AF:

0.00000658

AC:

AN:

151982

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000242

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:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000171

AC:

AN:

175082

Hom.:

AF XY:

0.0000325

AC XY:

AN XY:

92366

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000130

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000117

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000817

AC:

AN:

1346722

Hom.:

Cov.:

AF XY:

0.00000913

AC XY:

AN XY:

656998

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.0000521

Gnomad4 SAS exome

AF:

0.0000155

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000664

Gnomad4 OTH exome

AF:

0.0000180

GnomAD4 genome

AF:

0.00000658

AC:

AN:

151982

Hom.:

Cov.:

AF XY:

0.0000135

AC XY:

AN XY:

74208

show subpopulations

Gnomad4 AFR

AF:

0.0000242

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.00000756

ExAC

AF:

0.00000849

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:4

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Oct 07, 2024

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.1904G>A (p.R635H) alteration is located in exon 11 (coding exon 10) of the NRXN1 gene. This alteration results from a G to A substitution at nucleotide position 1904, causing the arginine (R) at amino acid position 635 to be replaced by a histidine (H). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

not provided

Uncertain:1

Feb 13, 2017

GeneDx

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

A variant of uncertain significance has been identified in the NRXN1 gene. The R635H variant has not been published as a pathogenic variant, nor has it been reported as a benign variant to our knowledge. The R635H variant is not observed at a significant frequency in large population cohorts (Lek et al., 2016; 1000 Genomes Consortium et al., 2015; Exome Variant Server). This substitution occurs at a position that is conserved across species. However, the R635H variant is a conservative amino acid substitution, which is not likely to impact secondary protein structure as these residues share similar properties. 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 variant or a rare benign variant. -

Pitt-Hopkins-like syndrome 2

Uncertain:1

Jan 06, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces arginine, which is basic and polar, with histidine, which is basic and polar, at codon 635 of the NRXN1 protein (p.Arg635His). This variant is present in population databases (rs761279630, gnomAD 0.01%). This variant has not been reported in the literature in individuals affected with NRXN1-related conditions. ClinVar contains an entry for this variant (Variation ID: 423467). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. 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. -

Pitt-Hopkins-like syndrome 2;C3808494:Chromosome 2p16.3 deletion syndrome

Uncertain:1

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.23

BayesDel_addAF

Uncertain

0.15

BayesDel_noAF

Pathogenic

0.21

CADD

Pathogenic

DANN

Pathogenic

1.0

DEOGEN2

Benign

0.073

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

Eigen

Pathogenic

0.70

Eigen_PC

Pathogenic

0.71

FATHMM_MKL

Pathogenic

0.99

LIST_S2

Pathogenic

0.99

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

M_CAP

Benign

0.059

MetaRNN

Pathogenic

0.75

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

MetaSVM

Uncertain

-0.028

MutationAssessor

Benign

1.9

.;L;.;.;.;.;.;.

PrimateAI

Pathogenic

0.90

PROVEAN

Benign

-2.1

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

REVEL

Pathogenic

0.70

Sift

Benign

0.12

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

Sift4G

Uncertain

0.019

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

Polyphen

1.0

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

Vest4

0.87

MutPred

0.60

.;Loss of phosphorylation at T593 (P = 0.1076);.;Loss of phosphorylation at T593 (P = 0.1076);.;.;.;.;

MVP

0.59

MPC

0.96

ClinPred

0.67

GERP RS

5.7

Varity_R

0.16

gMVP

0.55

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over