chr4-89800486-C-G

Position:

• chr4-89800486-C-G

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_000345.4(SNCA):​c.306+21760G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.189 in 152,070 control chromosomes in the GnomAD database, including 3,442 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 0.19 (3442 hom., cov: 32)
• Consequence: SNCA NM_000345.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.728

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]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.58).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.27 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SNCA	NM_000345.4	c.306+21760G>C		intron_variant		ENST00000394991.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SNCA	ENST00000394991.8	c.306+21760G>C		intron_variant		1	NM_000345.4	P1

Frequencies

GnomAD3 genomes AF: 0.189 AC: 28689 AN: 151952 Hom.: 3441 Cov.: 32

Gnomad AFR AF: 0.0656

Gnomad AMI AF: 0.350

Gnomad AMR AF: 0.177

Gnomad ASJ AF: 0.206

Gnomad EAS AF: 0.000964

Gnomad SAS AF: 0.122

Gnomad FIN AF: 0.244

Gnomad MID AF: 0.143

Gnomad NFE AF: 0.274

Gnomad OTH AF: 0.209

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

GnomAD4 genome AF: 0.189 AC: 28697 AN: 152070 Hom.: 3442 Cov.: 32 AF XY: 0.186 AC XY: 13786 AN XY: 74316

Gnomad4 AFR AF: 0.0654

Gnomad4 AMR AF: 0.177

Gnomad4 ASJ AF: 0.206

Gnomad4 EAS AF: 0.000966

Gnomad4 SAS AF: 0.124

Gnomad4 FIN AF: 0.244

Gnomad4 NFE AF: 0.274

Gnomad4 OTH AF: 0.207

Alfa AF: 0.129 Hom.: 254

Bravo AF: 0.181

Asia WGS AF: 0.0600 AC: 212 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.58
CADD	Benign	11
DANN	Benign	0.72

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

Publications

LitVar

Other links and lift over

dbSNP: rs2583959; hg19: chr4-90721637;