4-89784213-A-G

Position:

• chr4-89784213-A-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+38033T>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.798 in 151,950 control chromosomes in the GnomAD database, including 48,589 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 0.80 (48589 hom., cov: 31)
• Consequence: SNCA NM_000345.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 0.402

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 (EAS) allele frequency at 95% confidence interval = 0.832 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SNCA	NM_000345.4	c.306+38033T>C		intron_variant		ENST00000394991.8	NP_000336.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SNCA	ENST00000394991.8	c.306+38033T>C		intron_variant		1	NM_000345.4	ENSP00000378442	P1

Frequencies

GnomAD3 genomes AF: 0.798 AC: 121230 AN: 151832 Hom.: 48539 Cov.: 31

Gnomad AFR AF: 0.815

Gnomad AMI AF: 0.820

Gnomad AMR AF: 0.741

Gnomad ASJ AF: 0.726

Gnomad EAS AF: 0.853

Gnomad SAS AF: 0.696

Gnomad FIN AF: 0.828

Gnomad MID AF: 0.744

Gnomad NFE AF: 0.804

Gnomad OTH AF: 0.792

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

GnomAD4 genome AF: 0.798 AC: 121329 AN: 151950 Hom.: 48589 Cov.: 31 AF XY: 0.796 AC XY: 59100 AN XY: 74282

Gnomad4 AFR AF: 0.815

Gnomad4 AMR AF: 0.741

Gnomad4 ASJ AF: 0.726

Gnomad4 EAS AF: 0.853

Gnomad4 SAS AF: 0.695

Gnomad4 FIN AF: 0.828

Gnomad4 NFE AF: 0.804

Gnomad4 OTH AF: 0.789

Alfa AF: 0.800 Hom.: 6971

Bravo AF: 0.799

Asia WGS AF: 0.764 AC: 2658 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	2.5
DANN	Benign	0.38

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: rs356186; hg19: chr4-90705364;