2-51026362-C-T

Position:

• chr2-51026362-C-T

Variant summary

Our verdict is Benign. Variant got -20 ACMG points: 0P and 20B. BP4_Strong BP6_Very_Strong BS1 BS2

The NM_001330078.2(NRXN1):​c.772+1140G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00171 in 1,554,786 control chromosomes in the GnomAD database, including 37 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0084 (13 hom., cov: 33)
  • Exomes 𝑓: 0.00098 (24 hom.)
• Consequence: NRXN1 NM_001330078.2 intron
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:8
• Conservation: PhyloP100: -0.515

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 (HGNC:):

ACMG classification

Verdict is Benign. Variant got -20 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.91).
• BP6: Variant 2-51026362-C-T is Benign according to our data. Variant chr2-51026362-C-T is described in ClinVar as [Likely_benign]. Clinvar id is 129825.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00844 (1286/152320) while in subpopulation AFR AF= 0.0293 (1219/41558). AF 95% confidence interval is 0.028. There are 13 homozygotes in gnomad4. There are 576 alleles in male gnomad4 subpopulation. Median coverage is 33. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 13 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NRXN1	NM_001330078.2	c.772+1140G>A		intron_variant		ENST00000401669.7	NP_001317007.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NRXN1	ENST00000401669.7	c.772+1140G>A		intron_variant		5	NM_001330078.2	ENSP00000385017.2

Frequencies

GnomAD3 genomes AF: 0.00840 AC: 1278 AN: 152202 Hom.: 13 Cov.: 33

Gnomad AFR AF: 0.0292

Gnomad AMI AF: 0.00329

Gnomad AMR AF: 0.00242

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.000207

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00633

Gnomad NFE AF: 0.000206

Gnomad OTH AF: 0.00478

GnomAD3 exomes AF: 0.00198 AC: 398 AN: 201048 Hom.: 7 AF XY: 0.00176 AC XY: 189 AN XY: 107640

Gnomad AFR exome AF: 0.0287

Gnomad AMR exome AF: 0.000834

Gnomad ASJ exome AF: 0.000108

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000117

Gnomad OTH exome AF: 0.00114

GnomAD4 exome AF: 0.000976 AC: 1369 AN: 1402466 Hom.: 24 Cov.: 26 AF XY: 0.000872 AC XY: 607 AN XY: 695982

Gnomad4 AFR exome AF: 0.0321

Gnomad4 AMR exome AF: 0.000913

Gnomad4 ASJ exome AF: 0.0000393

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000369

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.000122

Gnomad4 OTH exome AF: 0.00245

GnomAD4 genome AF: 0.00844 AC: 1286 AN: 152320 Hom.: 13 Cov.: 33 AF XY: 0.00773 AC XY: 576 AN XY: 74488

Gnomad4 AFR AF: 0.0293

Gnomad4 AMR AF: 0.00242

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.000207

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000206

Gnomad4 OTH AF: 0.00473

Alfa AF: 0.000583 Hom.: 0

Bravo AF: 0.00908

Asia WGS AF: 0.00115 AC: 4 AN: 3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:8

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:4

Likely benign, no assertion criteria provided	clinical testing	Genetic Services Laboratory, University of Chicago	-	Likely benign based on allele frequency in 1000 Genomes Project or ESP global frequency and its presence in a patient with a rare or unrelated disease phenotype. NOT Sanger confirmed. -
Benign, criteria provided, single submitter	clinical testing	Athena Diagnostics	Jan 27, 2020	- -
Benign, criteria provided, single submitter	clinical testing	GeneDx	Jan 25, 2013	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Benign, criteria provided, single submitter	clinical testing	Al Jalila Children’s Genomics Center, Al Jalila Childrens Speciality Hospital	Jan 02, 2020	- -

not provided Benign:2

Likely benign, criteria provided, single submitter	clinical testing	Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics	Apr 24, 2017	- -
Likely benign, criteria provided, single submitter	not provided	Breakthrough Genomics, Breakthrough Genomics	-	- -

Pitt-Hopkins-like syndrome 2 Benign:2

Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Feb 01, 2024	- -
Benign, criteria provided, single submitter	clinical testing	Illumina Laboratory Services, Illumina	Jan 13, 2018	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.91
CADD	Benign	1.2
DANN	Benign	0.68

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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

Other links and lift over

dbSNP: rs61658382; hg19: chr2-51253500;