2-50620057-G-C

Variant names:

• chr2-50620057-G-C
• rs78540316
• NM_001330078.2:c.1285C>G

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM2 PP3

The NM_001330078.2(NRXN1):​c.1285C>G​(p.Pro429Ala) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P429S) has been classified as Likely benign.

• Frequency: Genomes: not found (cov: 32)
• Consequence: NRXN1 NM_001330078.2 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 10.0
• Publications: 0 publications found

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)

ACMG classification

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.759

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
NRXN1	NM_001330078.2	c.1285C>G	p.Pro429Ala	missense_variant	Exon 8 of 23	ENST00000401669.7	NP_001317007.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
NRXN1	ENST00000401669.7	c.1285C>G	p.Pro429Ala	missense_variant	Exon 8 of 23	5	NM_001330078.2	ENSP00000385017.2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.79
BayesDel_addAF	Pathogenic	0.28	D
BayesDel_noAF	Pathogenic	0.16
CADD	Pathogenic	29
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.46	.;T;.;.;T;.;.;T;T;.
Eigen	Uncertain	0.60
Eigen_PC	Pathogenic	0.70
FATHMM_MKL	Pathogenic	0.99	D
LIST_S2	Pathogenic	1.0	D;D;D;D;D;D;D;D;D;T
M_CAP	Uncertain	0.096	D
MetaRNN	Uncertain	0.70	D;D;D;D;D;D;D;D;D;D
MetaSVM	Benign	-0.49	T
MutationAssessor	Benign	1.1	.;L;.;.;.;.;.;.;.;.
PhyloP100		10
PrimateAI	Pathogenic	0.90	D
PROVEAN	Pathogenic	-6.3	.;D;D;D;.;.;D;.;.;.
REVEL	Uncertain	0.46
Sift	Uncertain	0.013	.;D;D;D;.;.;D;.;.;.
Sift4G	Uncertain	0.0060	D;D;D;D;D;D;D;D;D;D
Polyphen		1.0	.;.;D;.;.;.;.;.;.;.
Vest4		0.73
MutPred		0.49		.;Gain of catalytic residue at P429 (P = 0.059);.;Gain of catalytic residue at P429 (P = 0.059);.;.;.;.;.;.;
MVP		0.62
MPC		0.87
ClinPred		0.96	D
GERP RS		6.2
PromoterAI		-0.013	Neutral
Varity_R		0.53
gMVP		0.35
Mutation Taster		=54/46	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.060		Details are displayed if max score is > 0.2

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

Other links and lift over

dbSNP: rs78540316; hg19: chr2-50847195;