NM_000345.4:c.307-18186A>G

Variant names:

• chr4-89747463-T-C
• rs356200
• NM_000345.4:c.307-18186A>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.307-18186A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.442 in 152,012 control chromosomes in the GnomAD database, including 16,300 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 0.44 (16300 hom., cov: 31)
• Consequence: SNCA NM_000345.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.0180
• 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

LOC124900856 (HGNC:):

ACMG classification

Our verdict: Benign. The variant received -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.88).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.542 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.307-18186A>G		intron	N/A	NP_000336.1
	SNCA	NM_001146054.2		c.307-18186A>G		intron	N/A	NP_001139526.1
	SNCA	NM_001146055.2		c.307-18186A>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.307-18186A>G		intron	N/A	ENSP00000378442.4
	SNCA	ENST00000394986.5	TSL:1	c.307-18186A>G		intron	N/A	ENSP00000378437.1
	SNCA	ENST00000394989.6	TSL:1	c.265-18186A>G		intron	N/A	ENSP00000378440.2

Frequencies

GnomAD3 genomes AF: 0.443 AC: 67232 AN: 151894 Hom.: 16304 Cov.: 31

Gnomad AFR AF: 0.224

Gnomad AMI AF: 0.550

Gnomad AMR AF: 0.494

Gnomad ASJ AF: 0.499

Gnomad EAS AF: 0.398

Gnomad SAS AF: 0.494

Gnomad FIN AF: 0.527

Gnomad MID AF: 0.472

Gnomad NFE AF: 0.546

Gnomad OTH AF: 0.446

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

GnomAD4 genome AF: 0.442 AC: 67237 AN: 152012 Hom.: 16300 Cov.: 31 AF XY: 0.443 AC XY: 32913 AN XY: 74292

African (AFR) AF: 0.224 AC: 9279 AN: 41476

American (AMR) AF: 0.494 AC: 7533 AN: 15258

Ashkenazi Jewish (ASJ) AF: 0.499 AC: 1730 AN: 3470

East Asian (EAS) AF: 0.399 AC: 2051 AN: 5146

South Asian (SAS) AF: 0.494 AC: 2378 AN: 4814

European-Finnish (FIN) AF: 0.527 AC: 5576 AN: 10576

Middle Eastern (MID) AF: 0.459 AC: 135 AN: 294

European-Non Finnish (NFE) AF: 0.546 AC: 37130 AN: 67968

Other (OTH) AF: 0.441 AC: 927 AN: 2104

Alfa AF: 0.462 Hom.: 2644

Bravo AF: 0.426

Asia WGS AF: 0.395 AC: 1375 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.88
CADD	Benign	1.3
DANN	Benign	0.72
PhyloP100		0.018
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: rs356200; hg19: chr4-90668614;