NM_000345.4:c.306+30333C>T

Variant names:

• chr4-89791913-G-A
• rs12502363
• NM_000345.4:c.306+30333C>T

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+30333C>T variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.307 in 151,926 control chromosomes in the GnomAD database, including 8,070 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 0.31 (8070 hom., cov: 31)
• Consequence: SNCA NM_000345.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -2.42
• Publications: 11 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=-0.95).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.39 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+30333C>T		intron	N/A	NP_000336.1
	SNCA	NM_001146054.2		c.306+30333C>T		intron	N/A	NP_001139526.1
	SNCA	NM_001146055.2		c.306+30333C>T		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+30333C>T		intron	N/A	ENSP00000378442.4
	SNCA	ENST00000394986.5	TSL:1	c.306+30333C>T		intron	N/A	ENSP00000378437.1
	SNCA	ENST00000394989.6	TSL:1	c.264+30333C>T		intron	N/A	ENSP00000378440.2

Frequencies

GnomAD3 genomes AF: 0.307 AC: 46611 AN: 151808 Hom.: 8075 Cov.: 31

Gnomad AFR AF: 0.153

Gnomad AMI AF: 0.389

Gnomad AMR AF: 0.268

Gnomad ASJ AF: 0.328

Gnomad EAS AF: 0.304

Gnomad SAS AF: 0.252

Gnomad FIN AF: 0.418

Gnomad MID AF: 0.332

Gnomad NFE AF: 0.394

Gnomad OTH AF: 0.292

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

GnomAD4 genome AF: 0.307 AC: 46603 AN: 151926 Hom.: 8070 Cov.: 31 AF XY: 0.305 AC XY: 22634 AN XY: 74228

African (AFR) AF: 0.153 AC: 6350 AN: 41452

American (AMR) AF: 0.267 AC: 4086 AN: 15276

Ashkenazi Jewish (ASJ) AF: 0.328 AC: 1136 AN: 3464

East Asian (EAS) AF: 0.304 AC: 1566 AN: 5150

South Asian (SAS) AF: 0.251 AC: 1211 AN: 4816

European-Finnish (FIN) AF: 0.418 AC: 4408 AN: 10546

Middle Eastern (MID) AF: 0.337 AC: 99 AN: 294

European-Non Finnish (NFE) AF: 0.394 AC: 26784 AN: 67908

Other (OTH) AF: 0.288 AC: 608 AN: 2108

Alfa AF: 0.360 Hom.: 20862

Bravo AF: 0.289

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.95
CADD	Benign	0.26
DANN	Benign	0.39
PhyloP100		-2.4
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: rs12502363; hg19: chr4-90713064;