rs2619369

chr4-89812518-A-G

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BS1 BS2

The NM_000345.4(SNCA):c.306+9728T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0208 in 152,290 control chromosomes in the GnomAD database, including 49 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 0.021 (49 hom., cov: 32)
• Consequence: SNCA NM_000345.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.324

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=-0.84).
• BS1: Variant frequency is greater than expected in population nfe. gnomad4 allele frequency = 0.0208 (3166/152290) while in subpopulation NFE AF= 0.0285 (1938/68018). AF 95% confidence interval is 0.0274. There are 49 homozygotes in gnomad4. There are 1621 alleles in male gnomad4 subpopulation. This position pass quality control queck.
• BS2: High AC in GnomAd at 3165 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SNCA	NM_000345.4	c.306+9728T>C		intron_variant		ENST00000394991.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SNCA	ENST00000394991.8	c.306+9728T>C		intron_variant		1	NM_000345.4	P1

Frequencies

GnomAD3 genomes AF: 0.0208 AC: 3165 AN: 152172 Hom.: 49 Cov.: 32

Gnomad AFR AF: 0.00425

Gnomad AMI AF: 0.103

Gnomad AMR AF: 0.0124

Gnomad ASJ AF: 0.0228

Gnomad EAS AF: 0.000192

Gnomad SAS AF: 0.0215

Gnomad FIN AF: 0.0507

Gnomad MID AF: 0.0285

Gnomad NFE AF: 0.0285

Gnomad OTH AF: 0.0187

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

GnomAD4 genome AF: 0.0208 AC: 3166 AN: 152290 Hom.: 49 Cov.: 32 AF XY: 0.0218 AC XY: 1621 AN XY: 74490

Gnomad4 AFR AF: 0.00423

Gnomad4 AMR AF: 0.0124

Gnomad4 ASJ AF: 0.0228

Gnomad4 EAS AF: 0.000193

Gnomad4 SAS AF: 0.0213

Gnomad4 FIN AF: 0.0507

Gnomad4 NFE AF: 0.0285

Gnomad4 OTH AF: 0.0185

Alfa AF: 0.0298 Hom.: 5

Bravo AF: 0.0169

Asia WGS AF: 0.00837 AC: 29 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.84
Cadd	Benign	6.3
Dann	Benign	0.89

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: rs2619369; hg19: chr4-90733669;