Genetic Variant NRXN2:p.Ala1479Ala (chr11-64607898-G-T) – ACMG Classification: Likely_benign (-3 pts)

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2BP4_StrongBP7

The NM_015080.4(NRXN2):c.4437C>A(p.Ala1479Ala) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000706 in 1,416,516 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. A1479A) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 7.1e-7 ( 0 hom. )

Consequence

NRXN2
NM_015080.4 synonymous

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -1.69

Publications

0 publications found

Variant links:

Genes affected

NRXN2 (HGNC:8009): (neurexin 2) This gene encodes a member of the neurexin gene family. The products of these genes function as cell adhesion molecules and receptors in the vertebrate nervous system. These genes utilize two promoters. The majority of transcripts are produced from the upstream promoter and encode alpha-neurexin isoforms while a smaller number of transcripts are produced from the downstream promoter and encode beta-neuresin isoforms. The alpha-neurexins contain epidermal growth factor-like (EGF-like) sequences and laminin G domains, and have been shown to interact with neurexophilins. The beta-neurexins lack EGF-like sequences and contain fewer laminin G domains than alpha-neurexins. Alternative splicing and the use of alternative promoters may generate thousands of transcript variants (PMID: 12036300, PMID: 11944992).[provided by RefSeq, Jun 2010]

NRXN2 Gene-Disease associations (from GenCC):

autism
Inheritance: AD Classification: STRONG, LIMITED Submitted by: G2P, Ambry Genetics
neurodevelopmental disorder
Inheritance: AR Classification: LIMITED Submitted by: Ambry Genetics

NRXN2 links:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -3 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.53).

BP7

Synonymous conserved (PhyloP=-1.69 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_015080.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
NRXN2	NM_015080.4	MANE Select	c.4437C>A	p.Ala1479Ala	synonymous	Exon 23 of 23	NP_055895.1
NRXN2	NM_138732.3		c.4227C>A	p.Ala1409Ala	synonymous	Exon 20 of 20	NP_620060.1
NRXN2	NM_138734.3		c.1299C>A	p.Ala433Ala	synonymous	Exon 7 of 7	NP_620063.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
NRXN2	ENST00000265459.11	TSL:5 MANE Select	c.4437C>A	p.Ala1479Ala	synonymous	Exon 23 of 23	ENSP00000265459.5
NRXN2	ENST00000704782.1		c.4446C>A	p.Ala1482Ala	synonymous	Exon 22 of 22	ENSP00000516031.1
NRXN2	ENST00000377559.7	TSL:1	c.4227C>A	p.Ala1409Ala	synonymous	Exon 20 of 20	ENSP00000366782.3

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

7.06e-7

AC:

AN:

1416516

Hom.:

Cov.:

AF XY:

0.00000143

AC XY:

AN XY:

700418

show subpopulations

⚠️ The allele balance in gnomAD version 4 Exomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

32464

American (AMR)

AF:

0.00

AC:

AN:

38594

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25334

East Asian (EAS)

AF:

0.00

AC:

AN:

37104

South Asian (SAS)

AF:

0.00

AC:

AN:

81008

European-Finnish (FIN)

AF:

0.00

AC:

AN:

48042

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5466

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

1089896

Other (OTH)

AF:

0.0000171

AC:

AN:

58608

⚠️ The allele balance in gnomAD4 Exomes is highly skewed from 0.5 (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.225

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.53

CADD

Benign

2.1

(source)

DANN

Benign

0.92

PhyloP100

-1.7

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

ClinVar

Computational scores

Splicing

Publications

Other links and lift over