GeneBe

rs1553368900

Variant names:

Variant summary

Our verdict is Uncertain significance. The variant received 4 ACMG points: 4P and 0B. PVS1_ModeratePP5_Moderate

The NM_001330078.2(NRXN1):​c.773-304_790+128del variant causes a exon loss, splice acceptor, splice donor, splice region, intron change. The variant was absent in control chromosomes in GnomAD project. It is difficult to determine the true allele frequency of this variant because it is of type DEL_BIG, and the frequency of such variant types in population databases may be underestimated and unreliable. Variant has been reported in ClinVar as Likely pathogenic (★).

Frequency

Genomes: not found (cov: 32)

Consequence

NRXN1
NM_001330078.2 exon_loss, splice_acceptor, splice_donor, splice_region, intron

Scores

Not classified

Clinical Significance

Likely pathogenic criteria provided, single submitter P:1

Conservation

PhyloP100: 3.97

Publications

0 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)

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 4 ACMG points.

PVS1
Splicing +-2 bp (donor or acceptor) variant, product NOT destroyed by NMD, known LOF gene, truncates exone, which is 0.00397878 fraction of the gene. No cryptic splice site detected. Exon removal is inframe change.
PP5
Variant 2-50925809-ACACAATCCAGAAACCAACAAATGTTCAGAAAGAAGTTCAACTTACCATCTAACTTCAAGATGTACCCTATTAGTACTAAGAAATAAAGGACAAATGAGAGTTGGAAAAATAAGGTAGAAAGCACCCACCTTCCACATTGTTGTCTTCTGAAAGCACATGACAAGGAGGGAGAGAAAAGGAAAAACATTCATTAAGCAGCATGCAGACTGGACCTTGCCTTTGCATGTCTTCCTCATGCAAGGCACCAAACACATCATGCAAGTGCTCCATCACTATCATTCAAGGGGGAAAACAAAATCACAGGGAAGCAGGTTCCCTCCCATTGGCAGCATTGATAGGAAGTGAGACAAACTTTCATAATACTGCCATGCCCTGTGCAAAGAGTTTTTAAAAAAATCTTTCAACTACCCAGTATAAAGCAAACATTATTGTTATTACATGTTGCTGGTG-A is Pathogenic according to our data. Variant chr2-50925809-ACACAATCCAGAAACCAACAAATGTTCAGAAAGAAGTTCAACTTACCATCTAACTTCAAGATGTACCCTATTAGTACTAAGAAATAAAGGACAAATGAGAGTTGGAAAAATAAGGTAGAAAGCACCCACCTTCCACATTGTTGTCTTCTGAAAGCACATGACAAGGAGGGAGAGAAAAGGAAAAACATTCATTAAGCAGCATGCAGACTGGACCTTGCCTTTGCATGTCTTCCTCATGCAAGGCACCAAACACATCATGCAAGTGCTCCATCACTATCATTCAAGGGGGAAAACAAAATCACAGGGAAGCAGGTTCCCTCCCATTGGCAGCATTGATAGGAAGTGAGACAAACTTTCATAATACTGCCATGCCCTGTGCAAAGAGTTTTTAAAAAAATCTTTCAACTACCCAGTATAAAGCAAACATTATTGTTATTACATGTTGCTGGTG-A is described in ClinVar as Likely_pathogenic. ClinVar VariationId is 560109.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene Transcript HGVSc HGVSp Effect Exon rank MANE Protein UniProt
NRXN1NM_001330078.2 linkc.773-304_790+128del exon_loss_variant, splice_acceptor_variant, splice_donor_variant, splice_region_variant, intron_variant Exon 3 of 23 ENST00000401669.7 NP_001317007.1

Ensembl

Gene Transcript HGVSc HGVSp Effect Exon rank TSL MANE Protein Appris UniProt
NRXN1ENST00000401669.7 linkc.773-304_790+128del exon_loss_variant, splice_acceptor_variant, splice_donor_variant, splice_region_variant, intron_variant Exon 3 of 23 5 NM_001330078.2 ENSP00000385017.2

Frequencies

GnomAD3 genomes
Cov.:
32
We have no GnomAD4 exomes data on this position. Probably position not covered by the project.
GnomAD4 genome
Cov.:
32

ClinVar

Significance: Likely pathogenic
Submissions summary: Pathogenic:1
Revision: criteria provided, single submitter
LINK: link

Submissions by phenotype

not provided Pathogenic:1
Jul 28, 2017
Geisinger Autism and Developmental Medicine Institute, Geisinger Health System
Significance:Likely pathogenic
Review Status:criteria provided, single submitter
Collection Method:provider interpretation

This 0.4 kilobase deletion was identified in a patient with autism spectrum disorder. The deletion includes exon 4 of the NRXN1 gene. Variants in the NRXN1 gene, including intragenic copy number variants, have been associated with variable neurodevelopmental diagnoses including autism spectrum disorders, intellectual disability, epilepsy, and schizophrenia. The features are variable from individual to individual. 2p16.3 deletions and variants in the NRXN1 gene have also been reported in healthy controls and unaffected parents of individuals with neuropsychiatric disorders indicating reduced penetrance or variable expressivity (Schaaf et al. 2012; Bena et al. 2013). -

Computational scores

Source: dbNSFP v4.3

Name
Calibrated prediction
Score
Prediction
PhyloP100
4.0

Splicing

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

Other links and lift over

dbSNP: rs1553368900; hg19: chr2-51152947; API