chr20-10305665-A-C

Position:

• chr20-10305665-A-C

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_130811.4(SNAP25):​c.553-464A>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.703 in 151,988 control chromosomes in the GnomAD database, including 37,926 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.70 (37926 hom., cov: 31)
• Consequence: SNAP25 NM_130811.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.28

Genes affected

SNAP25 (HGNC:11132): (synaptosome associated protein 25) Synaptic vesicle membrane docking and fusion is mediated by SNAREs (soluble N-ethylmaleimide-sensitive factor attachment protein receptors) located on the vesicle membrane (v-SNAREs) and the target membrane (t-SNAREs). The assembled v-SNARE/t-SNARE complex consists of a bundle of four helices, one of which is supplied by v-SNARE and the other three by t-SNARE. For t-SNAREs on the plasma membrane, the protein syntaxin supplies one helix and the protein encoded by this gene contributes the other two. Therefore, this gene product is a presynaptic plasma membrane protein involved in the regulation of neurotransmitter release. Two alternative transcript variants encoding different protein isoforms have been described for this gene. [provided by RefSeq, Jul 2008]

SNAP25-AS1 (HGNC:44312): (SNAP25 antisense RNA 1)

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.95).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.796 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SNAP25	NM_130811.4	c.553-464A>C		intron_variant		ENST00000254976.7	NP_570824.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SNAP25	ENST00000254976.7	c.553-464A>C		intron_variant		1	NM_130811.4	ENSP00000254976	P5
SNAP25-AS1	ENST00000421143.6	n.5+63050T>G		intron_variant, non_coding_transcript_variant		5

Frequencies

GnomAD3 genomes AF: 0.703 AC: 106783 AN: 151870 Hom.: 37881 Cov.: 31

Gnomad AFR AF: 0.803

Gnomad AMI AF: 0.589

Gnomad AMR AF: 0.721

Gnomad ASJ AF: 0.713

Gnomad EAS AF: 0.771

Gnomad SAS AF: 0.721

Gnomad FIN AF: 0.668

Gnomad MID AF: 0.658

Gnomad NFE AF: 0.639

Gnomad OTH AF: 0.670

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.703 AC: 106889 AN: 151988 Hom.: 37926 Cov.: 31 AF XY: 0.706 AC XY: 52459 AN XY: 74276

Gnomad4 AFR AF: 0.804

Gnomad4 AMR AF: 0.722

Gnomad4 ASJ AF: 0.713

Gnomad4 EAS AF: 0.771

Gnomad4 SAS AF: 0.721

Gnomad4 FIN AF: 0.668

Gnomad4 NFE AF: 0.639

Gnomad4 OTH AF: 0.667

Alfa AF: 0.649 Hom.: 38600

Bravo AF: 0.709

Asia WGS AF: 0.705 AC: 2452 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.95
CADD	Benign	0.63
DANN	Benign	0.50

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.010		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: rs4813925; hg19: chr20-10286313;