chr2-51027954-G-A

Position:

chr2-51027954-G-A

Variant summary

Our verdict is Likely benign. Variant got -5 ACMG points: 0P and 5B. BP4_StrongBS1_Supporting

The NM_001330078.2(NRXN1):c.320C>T(p.Thr107Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000618 in 1,603,048 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign 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. T107K) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00015 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000052 ( 0 hom. )

Consequence

NRXN1
NM_001330078.2 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 3.52

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 Likely_benign. Variant got -5 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.053430825).

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.000151 (23/152310) while in subpopulation AFR AF= 0.000433 (18/41584). AF 95% confidence interval is 0.000279. There are 0 homozygotes in gnomad4. There are 12 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
NRXN1	NM_001330078.2 linkuse as main transcript	c.320C>T	p.Thr107Met	missense_variant	2/23	ENST00000401669.7

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
NRXN1	ENST00000401669.7 linkuse as main transcript	c.320C>T	p.Thr107Met	missense_variant	2/23	5	NM_001330078.2	A1

Frequencies

GnomAD3 genomes

AF:

0.000145

AC:

AN:

152192

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000434

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.000288

Gnomad EAS

AF:

0.000389

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.0000813

AC:

AN:

233668

Hom.:

AF XY:

0.0000776

AC XY:

AN XY:

128784

show subpopulations

Gnomad AFR exome

AF:

0.000625

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.000103

Gnomad EAS exome

AF:

0.000171

Gnomad SAS exome

AF:

0.0000658

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000279

Gnomad OTH exome

AF:

0.000173

GnomAD4 exome

AF:

0.0000524

AC:

AN:

1450738

Hom.:

Cov.:

AF XY:

0.0000512

AC XY:

AN XY:

722190

show subpopulations

Gnomad4 AFR exome

AF:

0.000687

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.000269

Gnomad4 EAS exome

AF:

0.0000252

Gnomad4 SAS exome

AF:

0.000128

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000261

Gnomad4 OTH exome

AF:

0.0000830

GnomAD4 genome

AF:

0.000151

AC:

AN:

152310

Hom.:

Cov.:

AF XY:

0.000161

AC XY:

AN XY:

74476

show subpopulations

Gnomad4 AFR

AF:

0.000433

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.000288

Gnomad4 EAS

AF:

0.000389

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.000178

ESP6500AA

AF:

0.000487

AC:

ESP6500EA

AF:

0.00

AC:

ExAC

AF:

0.0000998

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Genetic Services Laboratory, University of Chicago

Jan 18, 2017

- -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Apr 17, 2024

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Missense variant in a gene in which most reported pathogenic variants are truncating/loss of function; Has not been previously published as pathogenic or benign to our knowledge -

Pitt-Hopkins-like syndrome 2

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 methionine, which is neutral and non-polar, at codon 107 of the NRXN1 protein (p.Thr107Met). This variant is present in population databases (rs368549770, gnomAD 0.07%). 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: 436040). 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 tolerated. 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

0.11

BayesDel_addAF

Benign

-0.30

BayesDel_noAF

Benign

-0.27

CADD

Uncertain

DANN

Uncertain

0.97

DEOGEN2

Benign

0.33

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

Eigen

Benign

-0.091

Eigen_PC

Benign

0.033

FATHMM_MKL

Uncertain

0.88

LIST_S2

Uncertain

0.91

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

M_CAP

Benign

0.031

MetaRNN

Benign

0.053

T;T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.69

MutationAssessor

Benign

1.8

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

MutationTaster

Benign

0.99

N;N;N;N;N;N;N

PrimateAI

Uncertain

0.64

PROVEAN

Benign

-1.9

.;N;N;N;N;.;.;D;.;.

REVEL

Uncertain

0.30

Sift

Benign

0.082

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

Sift4G

Uncertain

0.045

D;D;D;D;D;D;T;T;.;T

Polyphen

0.062, 0.050

.;B;B;.;.;.;.;.;.;.

Vest4

0.28

MVP

0.12

MPC

0.67

ClinPred

0.029

GERP RS

5.0

Varity_R

0.038

gMVP

0.76

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

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