chr20-10275515-C-A

Variant names:

• chr20-10275515-C-A
• NM_130811.4:c.24C>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Moderate BP6_Moderate BP7

The NM_130811.4(SNAP25):​c.24C>A​(p.Arg8Arg) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: not found (cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: SNAP25 NM_130811.4 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 2.89
• Publications: 0 publications found

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

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=-0.21).
• BP6: Variant 20-10275515-C-A is Benign according to our data. Variant chr20-10275515-C-A is described in ClinVar as Likely_benign. ClinVar VariationId is 1792203.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=2.89 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_130811.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SNAP25	NM_130811.4	MANE Select	c.24C>A	p.Arg8Arg	synonymous	Exon 2 of 8	NP_570824.1	P60880-1
	SNAP25	NM_001322902.2		c.24C>A	p.Arg8Arg	synonymous	Exon 2 of 8	NP_001309831.1	P60880-2
	SNAP25	NM_001322903.2		c.24C>A	p.Arg8Arg	synonymous	Exon 3 of 9	NP_001309832.1	P60880-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SNAP25	ENST00000254976.7	TSL:1 MANE Select	c.24C>A	p.Arg8Arg	synonymous	Exon 2 of 8	ENSP00000254976.3	P60880-1
	SNAP25	ENST00000304886.6	TSL:1	c.24C>A	p.Arg8Arg	synonymous	Exon 2 of 8	ENSP00000307341.2	P60880-2
	SNAP25	ENST00000961779.1		c.24C>A	p.Arg8Arg	synonymous	Exon 2 of 9	ENSP00000631838.1

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1454472 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 722790

African (AFR) AF: 0.00 AC: 0 AN: 33394

American (AMR) AF: 0.00 AC: 0 AN: 43988

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 25956

East Asian (EAS) AF: 0.00 AC: 0 AN: 39546

South Asian (SAS) AF: 0.00 AC: 0 AN: 84320

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53040

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5742

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 1108382

Other (OTH) AF: 0.00 AC: 0 AN: 60104

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.21
CADD	Benign	11
DANN	Benign	0.86
PhyloP100		2.9

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

Other links and lift over

hg19: chr20-10256163; COSMIC: COSV54775232; COSMIC: COSV54775232;