chr2-50465557-G-A

Position:

• chr2-50465557-G-A

Variant summary

Our verdict is Benign. Variant got -19 ACMG points: 0P and 19B. BP4_Moderate BP6_Very_Strong BP7 BS1 BS2

The NM_001330078.2(NRXN1):​c.3249C>T​(p.Pro1083Pro) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.001 in 1,606,518 control chromosomes in the GnomAD database, including 15 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

• Frequency:
  • Genomes: 𝑓 0.0053 (6 hom., cov: 32)
  • Exomes 𝑓: 0.00055 (9 hom.)
• Consequence: NRXN1 NM_001330078.2 synonymous
• Clinical Significance: Benign/Likely benign criteria provided, multiple submitters, no conflicts B:7
• Conservation: PhyloP100: 0.536

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 -19 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.44).
• BP6: Variant 2-50465557-G-A is Benign according to our data. Variant chr2-50465557-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 129820.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr2-50465557-G-A is described in Lovd as [Benign].
• BP7: Synonymous conserved (PhyloP=0.536 with no splicing effect.
• BS1: Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00533 (810/151878) while in subpopulation AFR AF= 0.0182 (753/41480). AF 95% confidence interval is 0.0171. There are 6 homozygotes in gnomad4. There are 371 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.
• BS2: High Homozygotes in GnomAd4 at 6 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NRXN1	NM_001330078.2	c.3249C>T	p.Pro1083Pro	synonymous_variant	17/23	ENST00000401669.7	NP_001317007.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NRXN1	ENST00000401669.7	c.3249C>T	p.Pro1083Pro	synonymous_variant	17/23	5	NM_001330078.2	ENSP00000385017.2

Frequencies

GnomAD3 genomes AF: 0.00533 AC: 809 AN: 151760 Hom.: 6 Cov.: 32

Gnomad AFR AF: 0.0182

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00251

Gnomad ASJ AF: 0.00

Gnomad EAS AF: 0.00

Gnomad SAS AF: 0.00

Gnomad FIN AF: 0.00

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.000103

Gnomad OTH AF: 0.00575

GnomAD3 exomes AF: 0.00130 AC: 312 AN: 240222 Hom.: 2 AF XY: 0.000876 AC XY: 114 AN XY: 130132

Gnomad AFR exome AF: 0.0178

Gnomad AMR exome AF: 0.000899

Gnomad ASJ exome AF: 0.000205

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.0000342

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.0000737

Gnomad OTH exome AF: 0.00138

GnomAD4 exome AF: 0.000550 AC: 800 AN: 1454640 Hom.: 9 Cov.: 32 AF XY: 0.000460 AC XY: 333 AN XY: 723194

Gnomad4 AFR exome AF: 0.0189

Gnomad4 AMR exome AF: 0.00123

Gnomad4 ASJ exome AF: 0.000155

Gnomad4 EAS exome AF: 0.00

Gnomad4 SAS exome AF: 0.0000353

Gnomad4 FIN exome AF: 0.00

Gnomad4 NFE exome AF: 0.0000171

Gnomad4 OTH exome AF: 0.00142

GnomAD4 genome AF: 0.00533 AC: 810 AN: 151878 Hom.: 6 Cov.: 32 AF XY: 0.00500 AC XY: 371 AN XY: 74206

Gnomad4 AFR AF: 0.0182

Gnomad4 AMR AF: 0.00250

Gnomad4 ASJ AF: 0.00

Gnomad4 EAS AF: 0.00

Gnomad4 SAS AF: 0.00

Gnomad4 FIN AF: 0.00

Gnomad4 NFE AF: 0.000103

Gnomad4 OTH AF: 0.00569

Alfa AF: 0.00235 Hom.: 2

Bravo AF: 0.00632

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:7

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:3

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	GeneDx	May 10, 2012	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	Athena Diagnostics	Sep 30, 2024	- -

Pitt-Hopkins-like syndrome 2 Benign:2

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. -
Benign, criteria provided, single submitter	clinical testing	Labcorp Genetics (formerly Invitae), Labcorp	Jan 30, 2024	- -

Inborn genetic diseases Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

May 14, 2016

This alteration is classified as likely benign based on a combination of the following: seen in unaffected individuals, population frequency, intact protein function, lack of segregation with disease, co-occurrence, RNA analysis, in silico models, amino acid conservation, lack of disease association in case-control studies, and/or the mechanism of disease or impacted region is inconsistent with a known cause of pathogenicity. -

not provided Benign:1

Likely benign, criteria provided, single submitter

not provided

Breakthrough Genomics, Breakthrough Genomics

-

- -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.44
CADD	Benign	6.6
DANN	Benign	0.70

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

Other links and lift over

dbSNP: rs116236999; hg19: chr2-50692695;