chr4-89801282-G-A

Variant names:

• chr4-89801282-G-A
• rs2619373
• NM_000345.4:c.306+20964C>T

Variant summary

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

The NM_000345.4(SNCA):​c.306+20964C>T 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 152,050 control chromosomes in the GnomAD database, including 3,436 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 (3436 hom., cov: 32)
• Consequence: SNCA NM_000345.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -0.407

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).
• 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 rank	MANE	Protein	UniProt
SNCA	NM_000345.4	c.306+20964C>T		intron_variant	Intron 4 of 5	ENST00000394991.8	NP_000336.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SNCA	ENST00000394991.8	c.306+20964C>T		intron_variant	Intron 4 of 5	1	NM_000345.4	ENSP00000378442.4

Frequencies

GnomAD3 genomes AF: 0.189 AC: 28684 AN: 151932 Hom.: 3435 Cov.: 32

Gnomad AFR AF: 0.0657

Gnomad AMI AF: 0.350

Gnomad AMR AF: 0.177

Gnomad ASJ AF: 0.206

Gnomad EAS AF: 0.000962

Gnomad SAS AF: 0.122

Gnomad FIN AF: 0.243

Gnomad MID AF: 0.142

Gnomad NFE AF: 0.274

Gnomad OTH AF: 0.208

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

GnomAD4 genome AF: 0.189 AC: 28693 AN: 152050 Hom.: 3436 Cov.: 32 AF XY: 0.185 AC XY: 13776 AN XY: 74290

Gnomad4 AFR AF: 0.0655

Gnomad4 AMR AF: 0.177

Gnomad4 ASJ AF: 0.206

Gnomad4 EAS AF: 0.000965

Gnomad4 SAS AF: 0.124

Gnomad4 FIN AF: 0.243

Gnomad4 NFE AF: 0.274

Gnomad4 OTH AF: 0.206

Alfa AF: 0.228 Hom.: 551

Bravo AF: 0.181

Asia WGS AF: 0.0610 AC: 216 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	3.8
DANN	Benign	0.86

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: rs2619373; hg19: chr4-90722433;