4-89828154-C-T

Variant names:

• chr4-89828154-C-T
• rs431905511
• NM_000345.4:c.152G>A

Variant summary

Our verdict is Pathogenic. The variant received 10 ACMG points: 10P and 0B. PS3 PM1 PM2 PP5_Moderate

The NM_000345.4(SNCA):​c.152G>A​(p.Gly51Asp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). ClinVar reports functional evidence for this variant: "SCV002572882: Functional studies provide strong evidence of the variant having a damaging effect on the gene or gene product (PMID:24728187, 24984882).".

• Frequency: Genomes: not found (cov: 32)
• Consequence: SNCA NM_000345.4 missense
• Clinical Significance: Pathogenic criteria provided, single submitter P:2
• Conservation: PhyloP100: 3.35
• Publications: 593 publications found

Genes affected

SNCA (HGNC:11138): (synuclein alpha) Alpha-synuclein is a member of the synuclein family, which also includes beta- and gamma-synuclein. Synucleins are abundantly expressed in the brain and alpha- and beta-synuclein inhibit phospholipase D2 selectively. SNCA may serve to integrate presynaptic signaling and membrane trafficking. Defects in SNCA have been implicated in the pathogenesis of Parkinson disease. SNCA peptides are a major component of amyloid plaques in the brains of patients with Alzheimer's disease. Alternatively spliced transcripts encoding different isoforms have been identified for this gene. [provided by RefSeq, Feb 2016]

SNCA Gene-Disease associations (from GenCC):

• autosomal dominant Parkinson disease 4

  Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Labcorp Genetics (formerly Invitae), Ambry Genetics, Genomics England PanelApp
• Parkinson disease

  Inheritance: AD Classification: DEFINITIVE Submitted by: Ambry Genetics, ClinGen
• autosomal dominant Parkinson disease 1

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• Lewy body dementia

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
• hereditary late onset Parkinson disease

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
• parkinsonian-pyramidal syndrome

  Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 10 ACMG points.

• PS3: PS3 evidence extracted from ClinVar submissions: SCV002572882: Functional studies provide strong evidence of the variant having a damaging effect on the gene or gene product (PMID: 24728187, 24984882).
• PM1: In a hotspot region, there are 5 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 2 uncertain in NM_000345.4
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 4-89828154-C-T is Pathogenic according to our data. Variant chr4-89828154-C-T is described in ClinVar as Pathogenic. ClinVar VariationId is 97000.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_000345.4. 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
	SNCA	NM_000345.4	MANE Select	c.152G>A	p.Gly51Asp	missense	Exon 3 of 6	NP_000336.1	P37840-1
	SNCA	NM_001146054.2		c.152G>A	p.Gly51Asp	missense	Exon 3 of 6	NP_001139526.1	P37840-1
	SNCA	NM_001146055.2		c.152G>A	p.Gly51Asp	missense	Exon 3 of 6	NP_001139527.1	P37840-1

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SNCA	ENST00000394991.8	TSL:1 MANE Select	c.152G>A	p.Gly51Asp	missense	Exon 3 of 6	ENSP00000378442.4	P37840-1
	SNCA	ENST00000394986.5	TSL:1	c.152G>A	p.Gly51Asp	missense	Exon 3 of 6	ENSP00000378437.1	P37840-1
	SNCA	ENST00000345009.8	TSL:1	c.152G>A	p.Gly51Asp	missense	Exon 2 of 4	ENSP00000343683.4	P37840-2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 29

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
2	-	-	Autosomal dominant Parkinson disease 1 (2)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.76
PhyloP100		3.3
Varity_R		0.76
gMVP		0.66
Mutation Taster		=3/97	disease causing (ClinVar)

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

MaxEntScan Visualizer can be used to analyze the impact of this mutation on the neighboring sequence.

Other links and lift over

dbSNP: rs431905511; hg19: chr4-90749305;