Genetic Variant SNCA:c.306+27220G>C (chr4-89795026-C-G) – ACMG Classification: Benign (-12 pts)

Variant summary

Our verdict is Benign. The variant received -12 ACMG points: 0P and 12B. BP4_StrongBA1

The NM_000345.4(SNCA):c.306+27220G>C variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0724 in 152,044 control chromosomes in the GnomAD database, including 708 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 0.072 ( 708 hom., cov: 32)

Consequence

SNCA
NM_000345.4 intron

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.140

Publications

8 publications found

Variant links:

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]

SNCA Gene-Disease associations (from GenCC):

autosomal dominant Parkinson disease 4
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: Genomics England PanelApp, Ambry Genetics, Labcorp Genetics (formerly Invitae)
Parkinson disease
Inheritance: AD Classification: DEFINITIVE Submitted by: ClinGen, Ambry Genetics
autosomal dominant Parkinson disease 1
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
Lewy body dementia
Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp, Labcorp Genetics (formerly Invitae)
hereditary late onset Parkinson disease
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
parkinsonian-pyramidal syndrome
Inheritance: AR Classification: SUPPORTIVE Submitted by: Orphanet

SNCA links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -12 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.89).

BA1

GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.167 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SNCA	NM_000345.4 link	c.306+27220G>C		intron_variant	Intron 4 of 5	ENST00000394991.8	NP_000336.1	P37840-1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SNCA	ENST00000394991.8 link	c.306+27220G>C		intron_variant	Intron 4 of 5	1	NM_000345.4	ENSP00000378442.4		P37840-1

Frequencies

GnomAD3 genomes

AF:

0.0723

AC:

10987

AN:

151926

Hom.:

706

Cov.:

show subpopulations

Gnomad AFR

AF:

0.170

Gnomad AMI

AF:

0.0527

Gnomad AMR

AF:

0.0357

Gnomad ASJ

AF:

0.00950

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.0214

Gnomad FIN

AF:

0.0267

Gnomad MID

AF:

0.0348

Gnomad NFE

AF:

0.0414

Gnomad OTH

AF:

0.0551

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

GnomAD4 genome

AF:

0.0724

AC:

11005

AN:

152044

Hom.:

708

Cov.:

AF XY:

0.0696

AC XY:

5172

AN XY:

74326

show subpopulations

African (AFR)

AF:

0.170

AC:

7056

AN:

41460

American (AMR)

AF:

0.0356

AC:

544

AN:

15286

Ashkenazi Jewish (ASJ)

AF:

0.00950

AC:

AN:

3472

East Asian (EAS)

AF:

0.000193

AC:

AN:

5172

South Asian (SAS)

AF:

0.0214

AC:

103

AN:

4814

European-Finnish (FIN)

AF:

0.0267

AC:

282

AN:

10556

Middle Eastern (MID)

AF:

0.0408

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.0414

AC:

2811

AN:

67970

Other (OTH)

AF:

0.0545

AC:

115

AN:

2110

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.502

Heterozygous variant carriers

485

970

1454

1939

2424

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

114

228

342

456

570

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0144

Hom.:

Bravo

AF:

0.0780

Asia WGS

AF:

0.0260

AC:

AN:

3470

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.89

CADD

Benign

2.2

(source)

DANN

Benign

0.67

PhyloP100

-0.14

Mutation Taster

=100/0

polymorphism (auto)

(source)

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

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over