NM_000345.4:c.306+6880A>G

Variant names:

• chr4-89815366-T-C
• rs3822095
• NM_000345.4:c.306+6880A>G

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+6880A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.328 in 151,944 control chromosomes in the GnomAD database, including 8,777 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 0.33 (8777 hom., cov: 32)
• Consequence: SNCA NM_000345.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.17
• Publications: 14 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

ENSG00000301238 (HGNC:):

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 (NFE) allele frequency at 95% confidence interval = 0.396 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+6880A>G		intron	N/A	NP_000336.1
	SNCA	NM_001146054.2		c.306+6880A>G		intron	N/A	NP_001139526.1
	SNCA	NM_001146055.2		c.306+6880A>G		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+6880A>G		intron	N/A	ENSP00000378442.4
	SNCA	ENST00000394986.5	TSL:1	c.306+6880A>G		intron	N/A	ENSP00000378437.1
	SNCA	ENST00000394989.6	TSL:1	c.264+6880A>G		intron	N/A	ENSP00000378440.2

Frequencies

GnomAD3 genomes AF: 0.328 AC: 49843 AN: 151824 Hom.: 8781 Cov.: 32

Gnomad AFR AF: 0.215

Gnomad AMI AF: 0.389

Gnomad AMR AF: 0.281

Gnomad ASJ AF: 0.328

Gnomad EAS AF: 0.302

Gnomad SAS AF: 0.251

Gnomad FIN AF: 0.422

Gnomad MID AF: 0.340

Gnomad NFE AF: 0.400

Gnomad OTH AF: 0.313

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

GnomAD4 genome AF: 0.328 AC: 49852 AN: 151944 Hom.: 8777 Cov.: 32 AF XY: 0.326 AC XY: 24182 AN XY: 74276

African (AFR) AF: 0.215 AC: 8923 AN: 41478

American (AMR) AF: 0.281 AC: 4285 AN: 15260

Ashkenazi Jewish (ASJ) AF: 0.328 AC: 1139 AN: 3472

East Asian (EAS) AF: 0.302 AC: 1563 AN: 5170

South Asian (SAS) AF: 0.251 AC: 1211 AN: 4830

European-Finnish (FIN) AF: 0.422 AC: 4448 AN: 10544

Middle Eastern (MID) AF: 0.345 AC: 100 AN: 290

European-Non Finnish (NFE) AF: 0.400 AC: 27177 AN: 67882

Other (OTH) AF: 0.309 AC: 653 AN: 2110

Alfa AF: 0.365 Hom.: 17536

Bravo AF: 0.313

Asia WGS AF: 0.245 AC: 849 AN: 3470

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.94
CADD	Benign	0.85
DANN	Benign	0.58
PhyloP100		-1.2
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: rs3822095; hg19: chr4-90736517;