2-50346870-GCGCCGCCGCCGCCGCCGC-GCGCCGCCGCCGCCGCCGCCGCCGC

Position:

• chr2-50346870-GCGCCGCCGCCGCCGCCGC-GCGCCGCCGCCGCCGCCGCCGCCGC

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP6_Very_Strong BS1

The ENST00000342183.9(NRXN1):​c.79_80insGCGGCG​(p.Gly25_Gly26dup) variant causes a inframe insertion change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0016 in 1,366,670 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. A27A) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0014 (0 hom., cov: 32)
  • Exomes 𝑓: 0.0016 (0 hom.)
• Consequence: NRXN1 ENST00000342183.9 inframe_insertion
• Clinical Significance: Likely benign criteria provided, multiple submitters, no conflicts B:3
• Conservation: PhyloP100: 1.48

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]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP6: Variant 2-50346870-G-GCGCCGC is Benign according to our data. Variant chr2-50346870-G-GCGCCGC is described in ClinVar as [Likely_benign]. Clinvar id is 516945.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.00137 (206/150482) while in subpopulation NFE AF= 0.00197 (133/67418). AF 95% confidence interval is 0.0017. There are 0 homozygotes in gnomad4. There are 95 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
NRXN1	NM_001330078.2	c.3365-109901_3365-109900insGCGGCG		intron_variant		ENST00000401669.7	NP_001317007.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
NRXN1	ENST00000401669.7	c.3365-109901_3365-109900insGCGGCG		intron_variant		5	NM_001330078.2	ENSP00000385017	A1

Frequencies

GnomAD3 genomes AF: 0.00137 AC: 206 AN: 150382 Hom.: 0 Cov.: 32

Gnomad AFR AF: 0.000631

Gnomad AMI AF: 0.00

Gnomad AMR AF: 0.00132

Gnomad ASJ AF: 0.00551

Gnomad EAS AF: 0.000589

Gnomad SAS AF: 0.000415

Gnomad FIN AF: 0.0000998

Gnomad MID AF: 0.00

Gnomad NFE AF: 0.00197

Gnomad OTH AF: 0.000965

GnomAD3 exomes AF: 0.000160 AC: 12 AN: 74950 Hom.: 0 AF XY: 0.000158 AC XY: 7 AN XY: 44242

Gnomad AFR exome AF: 0.00

Gnomad AMR exome AF: 0.000166

Gnomad ASJ exome AF: 0.000202

Gnomad EAS exome AF: 0.00

Gnomad SAS exome AF: 0.00

Gnomad FIN exome AF: 0.00

Gnomad NFE exome AF: 0.000290

Gnomad OTH exome AF: 0.00

GnomAD4 exome AF: 0.00163 AC: 1986 AN: 1216188 Hom.: 0 Cov.: 30 AF XY: 0.00158 AC XY: 939 AN XY: 594922

Gnomad4 AFR exome AF: 0.000432

Gnomad4 AMR exome AF: 0.000192

Gnomad4 ASJ exome AF: 0.00211

Gnomad4 EAS exome AF: 0.0000357

Gnomad4 SAS exome AF: 0.0000224

Gnomad4 FIN exome AF: 0.000102

Gnomad4 NFE exome AF: 0.00189

Gnomad4 OTH exome AF: 0.00101

GnomAD4 genome AF: 0.00137 AC: 206 AN: 150482 Hom.: 0 Cov.: 32 AF XY: 0.00129 AC XY: 95 AN XY: 73468

Gnomad4 AFR AF: 0.000654

Gnomad4 AMR AF: 0.00132

Gnomad4 ASJ AF: 0.00551

Gnomad4 EAS AF: 0.000394

Gnomad4 SAS AF: 0.000416

Gnomad4 FIN AF: 0.0000998

Gnomad4 NFE AF: 0.00197

Gnomad4 OTH AF: 0.000957

ClinVar

Significance: Likely benign

Submissions summary: Benign:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Benign:1

Likely benign, criteria provided, single submitter

clinical testing

GeneDx

Jan 17, 2018

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. -

Inborn genetic diseases Benign:1

Likely benign, criteria provided, single submitter

clinical testing

Ambry Genetics

Jun 12, 2018

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

clinical testing

CeGaT Center for Human Genetics Tuebingen

Jul 01, 2023

NRXN1: BP3 -

Computational scores

Source: dbNSFP v4.3

Splicing

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

Publications

LitVar

Other links and lift over

dbSNP: rs750165040; hg19: chr2-50574008;