Genetic Variant NM_001330078.2:c.2459G>A (chr2-50506533-C-T) – ACMG Classification: Benign (-13 pts)

Variant summary

Our verdict is Benign. The variant received -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_001330078.2(NRXN1):c.2459G>A(p.Ser820Asn) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000255 in 1,613,096 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. S820G) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.00015 ( 0 hom., cov: 32)

Exomes 𝑓: 0.00027 ( 2 hom. )

Consequence

NRXN1
NM_001330078.2 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:5B:2

Conservation

PhyloP100: 3.31

Publications

5 publications found

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 Gene-Disease associations (from GenCC):

complex neurodevelopmental disorder
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen
chromosome 2p16.3 deletion syndrome
Inheritance: AD Classification: STRONG Submitted by: Labcorp Genetics (formerly Invitae)
Pitt-Hopkins-like syndrome 2
Inheritance: AR Classification: STRONG, MODERATE Submitted by: G2P, Ambry Genetics, Labcorp Genetics (formerly Invitae)
autism
Inheritance: AD Classification: MODERATE Submitted by: G2P
schizophrenia
Inheritance: Unknown Classification: LIMITED Submitted by: Labcorp Genetics (formerly Invitae)

NRXN1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.051980168).

BP6

Variant 2-50506533-C-T is Benign according to our data. Variant chr2-50506533-C-T is described in ClinVar as Conflicting_classifications_of_pathogenicity. ClinVar VariationId is 206242.

BS1

Variant frequency is greater than expected in population sas. GnomAd4 allele frequency = 0.000151 (23/152176) while in subpopulation SAS AF = 0.00104 (5/4818). AF 95% confidence interval is 0.000409. There are 0 homozygotes in GnomAd4. There are 12 alleles in the male GnomAd4 subpopulation. Median coverage is 32. This position passed quality control check.

BS2

High Homozygotes in GnomAdExome4 at 2 AR,AD,Unknown gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001330078.2. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
NRXN1	NM_001330078.2	MANE Select	c.2459G>A	p.Ser820Asn	missense	Exon 13 of 23	NP_001317007.1
NRXN1	NM_001135659.3		c.2579G>A	p.Ser860Asn	missense	Exon 14 of 24	NP_001129131.1
NRXN1	NM_001330093.2		c.2456G>A	p.Ser819Asn	missense	Exon 13 of 23	NP_001317022.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
NRXN1	ENST00000401669.7	TSL:5 MANE Select	c.2459G>A	p.Ser820Asn	missense	Exon 13 of 23	ENSP00000385017.2
NRXN1	ENST00000404971.5	TSL:1	c.2579G>A	p.Ser860Asn	missense	Exon 14 of 24	ENSP00000385142.1
NRXN1	ENST00000625672.2	TSL:1	c.2435G>A	p.Ser812Asn	missense	Exon 11 of 21	ENSP00000485887.1

Frequencies

GnomAD3 genomes

AF:

0.000151

AC:

AN:

152058

Hom.:

Cov.:

show subpopulations

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:

0.00104

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000235

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.000258

AC:

AN:

248062

AF XY:

0.000327

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000291

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000249

Gnomad OTH exome

AF:

0.000166

GnomAD4 exome

AF:

0.000266

AC:

388

AN:

1460920

Hom.:

Cov.:

AF XY:

0.000316

AC XY:

230

AN XY:

726702

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33450

American (AMR)

AF:

0.0000224

AC:

AN:

44624

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26096

East Asian (EAS)

AF:

0.00

AC:

AN:

39662

South Asian (SAS)

AF:

0.00110

AC:

AN:

86184

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53356

Middle Eastern (MID)

AF:

0.000173

AC:

AN:

5764

European-Non Finnish (NFE)

AF:

0.000251

AC:

279

AN:

1111450

Other (OTH)

AF:

0.000182

AC:

AN:

60334

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.473

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Exome Hom

Variant carriers

100

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000151

AC:

AN:

152176

Hom.:

Cov.:

AF XY:

0.000161

AC XY:

AN XY:

74398

show subpopulations

African (AFR)

AF:

0.0000482

AC:

AN:

41512

American (AMR)

AF:

0.00

AC:

AN:

15280

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5156

South Asian (SAS)

AF:

0.00104

AC:

AN:

4818

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10600

Middle Eastern (MID)

AF:

0.00

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.000235

AC:

AN:

68020

Other (OTH)

AF:

0.00

AC:

AN:

2114

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.000305

Hom.:

Bravo

AF:

0.000113

ESP6500AA

AF:

0.000257

AC:

ESP6500EA

AF:

0.000363

AC:

ExAC

AF:

0.000215

AC:

Asia WGS

AF:

0.000289

AC:

AN:

3478

EpiCase

AF:

0.00

EpiControl

AF:

0.000238

ClinVar

ClinVar submissions as Germline

Significance:Conflicting classifications of pathogenicity

Revision:criteria provided, conflicting classifications

View on ClinVar

Pathogenic

VUS

Benign

Condition

not provided (3)

Inborn genetic diseases (1)

not specified (1)

Pitt-Hopkins-like syndrome 2 (1)

Pitt-Hopkins-like syndrome 2;C3808494:Chromosome 2p16.3 deletion syndrome (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.094

BayesDel_addAF

Benign

-0.34

BayesDel_noAF

Benign

-0.32

CADD

Uncertain

(source)

DANN

Uncertain

0.99

DEOGEN2

Benign

0.19

Eigen

Benign

-0.16

Eigen_PC

Benign

0.093

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.93

M_CAP

Benign

0.014

MetaRNN

Benign

0.052

MetaSVM

Benign

-0.70

MutationAssessor

Benign

-0.23

PhyloP100

3.3

PrimateAI

Uncertain

0.77

PROVEAN

Benign

-0.88

REVEL

Benign

0.27

Sift

Benign

0.37

Sift4G

Benign

0.49

Polyphen

0.0

Vest4

0.33

MVP

0.043

MPC

0.23

ClinPred

0.050

GERP RS

5.7

Varity_R

0.29

gMVP

0.42

Mutation Taster

=100/0

polymorphism

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over