15-42511850-G-A

Variant names:

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2BP4_Moderate

The NM_003825.4(SNAP23):c.4G>A(p.Asp2Asn) variant causes a missense change. The variant allele was found at a frequency of 0.00000441 in 1,585,672 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000028 ( 0 hom. )

Consequence

SNAP23
NM_003825.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 4.98

Variant links:

Genes affected

SNAP23 (HGNC:11131): (synaptosome associated protein 23) Specificity of vesicular transport is regulated, in part, by the interaction of a vesicle-associated membrane protein termed synaptobrevin/VAMP with a target compartment membrane protein termed syntaxin. These proteins, together with SNAP25 (synaptosome-associated protein of 25 kDa), form a complex which serves as a binding site for the general membrane fusion machinery. Synaptobrevin/VAMP and syntaxin are believed to be involved in vesicular transport in most, if not all cells, while SNAP25 is present almost exclusively in the brain, suggesting that a ubiquitously expressed homolog of SNAP25 exists to facilitate transport vesicle/target membrane fusion in other tissues. The protein encoded by this gene is structurally and functionally similar to SNAP25 and binds tightly to multiple syntaxins and synaptobrevins/VAMPs. It is an essential component of the high affinity receptor for the general membrane fusion machinery and is an important regulator of transport vesicle docking and fusion. Two alternative transcript variants encoding different protein isoforms have been described for this gene. [provided by RefSeq, Jul 2008]

SNAP23 links:

ENSG00000285942 (HGNC:):

ENSG00000285942 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 0 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.23572677).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SNAP23	NM_003825.4 link	c.4G>A	p.Asp2Asn	missense_variant	Exon 2 of 8	ENST00000249647.8	NP_003816.2	O00161-1A8K287

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SNAP23	ENST00000249647.8 link	c.4G>A	p.Asp2Asn	missense_variant	Exon 2 of 8	1	NM_003825.4	ENSP00000249647.3		O00161-1
ENSG00000285942	ENST00000650210.1 link	n.*310+3273C>T		intron_variant	Intron 8 of 8			ENSP00000497618.1		A0A3B3ISV5

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152034

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

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:

0.0000147

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.00000832

AC:

AN:

240244

Hom.:

AF XY:

0.00000767

AC XY:

AN XY:

130408

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000324

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000900

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000279

AC:

AN:

1433520

Hom.:

Cov.:

AF XY:

0.00000421

AC XY:

AN XY:

713074

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000238

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000274

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152152

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74384

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000151

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Jan 16, 2025

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.4G>A (p.D2N) alteration is located in exon 2 (coding exon 1) of the SNAP23 gene. This alteration results from a G to A substitution at nucleotide position 4, causing the aspartic acid (D) at amino acid position 2 to be replaced by an asparagine (N). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.091

BayesDel_addAF

Benign

-0.19

BayesDel_noAF

Benign

-0.40

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Benign

0.0056

T;T;.;T;.;T;T;.;.

Eigen

Uncertain

0.38

Eigen_PC

Uncertain

0.42

FATHMM_MKL

Uncertain

0.92

LIST_S2

Benign

0.85

D;D;D;D;.;T;T;D;.

M_CAP

Benign

0.0046

MetaRNN

Benign

0.24

T;T;T;T;T;T;T;T;T

MetaSVM

Benign

-0.72

MutationAssessor

Benign

1.8

.;L;L;.;.;.;.;.;L

PrimateAI

Uncertain

0.56

PROVEAN

Benign

-0.46

N;N;N;N;N;.;.;N;N

REVEL

Benign

0.20

Sift

Uncertain

0.0080

D;D;T;D;D;.;.;D;T

Sift4G

Benign

0.25

T;T;T;T;T;T;T;T;T

Polyphen

0.98, 0.99

.;D;D;.;.;.;.;.;D

Vest4

0.22, 0.28, 0.26, 0.29, 0.30, 0.33

MVP

0.40

MPC

0.74

ClinPred

0.71

GERP RS

4.5

Varity_R

0.074

gMVP

0.67

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.040

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over