rs796052777
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Variant summary
Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PP3_Moderate
The NM_001330078.2(NRXN1):c.2566C>T(p.Arg856Trp) variant causes a missense change. The variant allele was found at a frequency of 0.00000496 in 1,613,602 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 (★★).
Frequency
Genomes: 𝑓 0.0000066 ( 0 hom., cov: 32)
Exomes 𝑓: 0.0000048 ( 0 hom. )
Consequence
NRXN1
NM_001330078.2 missense
NM_001330078.2 missense
Scores
11
7
1
Clinical Significance
Conservation
PhyloP100: 6.52
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]
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ACMG classification
Classification made for transcript
Verdict is Uncertain_significance. Variant got 2 ACMG points.
PP3
MetaRNN computational evidence supports a deleterious effect, 0.891
Transcripts
RefSeq
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | MANE | Protein | UniProt |
---|---|---|---|---|---|---|---|---|
NRXN1 | NM_001330078.2 | c.2566C>T | p.Arg856Trp | missense_variant | 14/23 | ENST00000401669.7 | NP_001317007.1 |
Ensembl
Gene | Transcript | HGVSc | HGVSp | Effect | #exon/exons | TSL | MANE | Protein | Appris | UniProt |
---|---|---|---|---|---|---|---|---|---|---|
NRXN1 | ENST00000401669.7 | c.2566C>T | p.Arg856Trp | missense_variant | 14/23 | 5 | NM_001330078.2 | ENSP00000385017 | A1 |
Frequencies
GnomAD3 genomes AF: 0.00000657 AC: 1AN: 152136Hom.: 0 Cov.: 32
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GnomAD4 exome AF: 0.00000479 AC: 7AN: 1461466Hom.: 0 Cov.: 31 AF XY: 0.00000413 AC XY: 3AN XY: 727042
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GnomAD4 genome AF: 0.00000657 AC: 1AN: 152136Hom.: 0 Cov.: 32 AF XY: 0.00 AC XY: 0AN XY: 74322
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ClinVar
Significance: Uncertain significance
Submissions summary: Uncertain:2
Revision: criteria provided, multiple submitters, no conflicts
LINK: link
Submissions by phenotype
not provided Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | GeneDx | May 27, 2016 | The R896W variant has not been published as a mutation, nor has it been reported as a benign polymorphism to our knowledge. It was not observed in approximately 6,100 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 R896W variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. This substitution occurs at a position that is conserved across species, and in silico analysis predicts this variant is probably damaging to the protein structure/function. However, other missense mutations in nearby residues have not been reported in the Human Gene Mutation Database (Stenson et al., 2014). Based on the currently available information, it is unclear whether the R896W variant is a pathogenic mutation or a rare benign variant. - |
Pitt-Hopkins-like syndrome 2 Uncertain:1
Uncertain significance, criteria provided, single submitter | clinical testing | Labcorp Genetics (formerly Invitae), Labcorp | Apr 06, 2022 | Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Deleterious"; PolyPhen-2: "Probably Damaging"; Align-GVGD: "Class C0"). This sequence change replaces arginine, which is basic and polar, with tryptophan, which is neutral and slightly polar, at codon 896 of the NRXN1 protein (p.Arg896Trp). This variant is not present in population databases (gnomAD no frequency). This missense change has been observed in individual(s) with clinical features of NRXN1-related conditions (PMID: 30709877, 32942984). This variant is also known as R856W. ClinVar contains an entry for this variant (Variation ID: 206248). Experimental studies have shown that this missense change affects NRXN1 function (PMID: 32942984). 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:
Name
Calibrated prediction
Score
Prediction
AlphaMissense
Pathogenic
BayesDel_addAF
Pathogenic
D
BayesDel_noAF
Pathogenic
CADD
Pathogenic
DANN
Pathogenic
DEOGEN2
Uncertain
.;D;.;.;T;.;.;D
Eigen
Uncertain
Eigen_PC
Uncertain
FATHMM_MKL
Pathogenic
D
LIST_S2
Pathogenic
D;D;D;D;D;D;D;D
M_CAP
Uncertain
D
MetaRNN
Pathogenic
D;D;D;D;D;D;D;D
MetaSVM
Uncertain
D
MutationAssessor
Uncertain
.;M;.;.;.;.;.;.
MutationTaster
Benign
D;D;D;D;D;D
PrimateAI
Pathogenic
D
PROVEAN
Pathogenic
.;D;D;D;.;.;.;.
REVEL
Pathogenic
Sift
Uncertain
.;D;D;D;.;.;.;.
Sift4G
Pathogenic
D;D;D;D;D;D;D;D
Polyphen
1.0
.;.;D;.;.;.;.;.
Vest4
MutPred
0.76
.;Gain of catalytic residue at R856 (P = 0.0804);.;Gain of catalytic residue at R856 (P = 0.0804);.;.;.;.;
MVP
MPC
0.90
ClinPred
D
GERP RS
Varity_R
gMVP
Splicing
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SpliceAI score (max)
Details are displayed if max score is > 0.2
Find out detailed SpliceAI scores and Pangolin per-transcript scores at