4-89835040-C-T

Position:

• chr4-89835040-C-T

Variant summary

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

The NM_000345.4(SNCA):​c.121+507G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.188 in 152,216 control chromosomes in the GnomAD database, including 3,401 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 (3401 hom., cov: 33)
• Consequence: SNCA NM_000345.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.785

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=-0.9).
• BA1: GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.269 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SNCA	NM_000345.4	c.121+507G>A		intron_variant		ENST00000394991.8	NP_000336.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SNCA	ENST00000394991.8	c.121+507G>A		intron_variant		1	NM_000345.4	ENSP00000378442	P1

Frequencies

GnomAD3 genomes AF: 0.188 AC: 28581 AN: 152098 Hom.: 3400 Cov.: 33

Gnomad AFR AF: 0.0653

Gnomad AMI AF: 0.349

Gnomad AMR AF: 0.176

Gnomad ASJ AF: 0.207

Gnomad EAS AF: 0.000963

Gnomad SAS AF: 0.122

Gnomad FIN AF: 0.243

Gnomad MID AF: 0.142

Gnomad NFE AF: 0.272

Gnomad OTH AF: 0.208

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

GnomAD4 genome AF: 0.188 AC: 28590 AN: 152216 Hom.: 3401 Cov.: 33 AF XY: 0.185 AC XY: 13752 AN XY: 74418

Gnomad4 AFR AF: 0.0651

Gnomad4 AMR AF: 0.176

Gnomad4 ASJ AF: 0.207

Gnomad4 EAS AF: 0.000965

Gnomad4 SAS AF: 0.124

Gnomad4 FIN AF: 0.243

Gnomad4 NFE AF: 0.272

Gnomad4 OTH AF: 0.207

Alfa AF: 0.227 Hom.: 545

Bravo AF: 0.180

Asia WGS AF: 0.0610 AC: 214 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.90
CADD	Benign	0.91
DANN	Benign	0.34

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: rs2619360; hg19: chr4-90756191;