chr4-89782082-A-G

Variant names:

• chr4-89782082-A-G
• rs356184
• NM_000345.4:c.306+40164T>C

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000345.4(SNCA):​c.306+40164T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.797 in 151,956 control chromosomes in the GnomAD database, including 48,849 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 0.80 (48849 hom., cov: 32)
• Consequence: SNCA NM_000345.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.388
• Publications: 6 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: Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae)
• Parkinson disease

  Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen, Ambry Genetics
• 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: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.94).
• BA1: GnomAd4 highest subpopulation (EAS) allele frequency at 95% confidence interval = 0.976 is higher than 0.05.

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

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SNCA	NM_000345.4	MANE Select	c.306+40164T>C		intron	N/A	NP_000336.1
	SNCA	NM_001146054.2		c.306+40164T>C		intron	N/A	NP_001139526.1
	SNCA	NM_001146055.2		c.306+40164T>C		intron	N/A	NP_001139527.1

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SNCA	ENST00000394991.8	TSL:1 MANE Select	c.306+40164T>C		intron	N/A	ENSP00000378442.4
	SNCA	ENST00000394986.5	TSL:1	c.306+40164T>C		intron	N/A	ENSP00000378437.1
	SNCA	ENST00000394989.6	TSL:1	c.264+40164T>C		intron	N/A	ENSP00000378440.2

Frequencies

GnomAD3 genomes AF: 0.797 AC: 121054 AN: 151836 Hom.: 48799 Cov.: 32

Gnomad AFR AF: 0.896

Gnomad AMI AF: 0.652

Gnomad AMR AF: 0.815

Gnomad ASJ AF: 0.793

Gnomad EAS AF: 0.999

Gnomad SAS AF: 0.878

Gnomad FIN AF: 0.754

Gnomad MID AF: 0.857

Gnomad NFE AF: 0.721

Gnomad OTH AF: 0.781

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

GnomAD4 genome AF: 0.797 AC: 121162 AN: 151956 Hom.: 48849 Cov.: 32 AF XY: 0.802 AC XY: 59537 AN XY: 74252

African (AFR) AF: 0.896 AC: 37176 AN: 41500

American (AMR) AF: 0.816 AC: 12412 AN: 15214

Ashkenazi Jewish (ASJ) AF: 0.793 AC: 2751 AN: 3468

East Asian (EAS) AF: 0.999 AC: 5164 AN: 5168

South Asian (SAS) AF: 0.876 AC: 4228 AN: 4828

European-Finnish (FIN) AF: 0.754 AC: 7973 AN: 10572

Middle Eastern (MID) AF: 0.854 AC: 251 AN: 294

European-Non Finnish (NFE) AF: 0.721 AC: 48964 AN: 67894

Other (OTH) AF: 0.783 AC: 1650 AN: 2108

Alfa AF: 0.750 Hom.: 8963

Bravo AF: 0.803

Asia WGS AF: 0.937 AC: 3253 AN: 3476

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.94
CADD	Benign	4.0
DANN	Benign	0.64
PhyloP100		0.39
Mutation Taster		=100/0	polymorphism (auto)

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

dbSNP: rs356184; hg19: chr4-90703233;