Genetic Variant SNCA:c.306+20526G>A (chr4-89801720-C-T) – 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+20526G>A variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.316 in 151,932 control chromosomes in the GnomAD database, including 8,421 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 0.32 ( 8421 hom., cov: 32)

Consequence

SNCA
NM_000345.4 intron

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: -0.408

Publications

5 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=-0.92).

BA1

GnomAd4 highest subpopulation (NFE) allele frequency at 95% confidence interval = 0.396 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SNCA	NM_000345.4 link	c.306+20526G>A		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+20526G>A		intron_variant	Intron 4 of 5	1	NM_000345.4	ENSP00000378442.4		P37840-1

Frequencies

GnomAD3 genomes

AF:

0.316

AC:

48028

AN:

151814

Hom.:

8426

Cov.:

show subpopulations

Gnomad AFR

AF:

0.177

Gnomad AMI

AF:

0.388

Gnomad AMR

AF:

0.269

Gnomad ASJ

AF:

0.328

Gnomad EAS

AF:

0.303

Gnomad SAS

AF:

0.252

Gnomad FIN

AF:

0.423

Gnomad MID

AF:

0.332

Gnomad NFE

AF:

0.400

Gnomad OTH

AF:

0.301

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

GnomAD4 genome

AF:

0.316

AC:

48025

AN:

151932

Hom.:

8421

Cov.:

AF XY:

0.314

AC XY:

23291

AN XY:

74230

show subpopulations

African (AFR)

AF:

0.176

AC:

7306

AN:

41434

American (AMR)

AF:

0.269

AC:

4106

AN:

15264

Ashkenazi Jewish (ASJ)

AF:

0.328

AC:

1139

AN:

3472

East Asian (EAS)

AF:

0.303

AC:

1568

AN:

5174

South Asian (SAS)

AF:

0.252

AC:

1211

AN:

4812

European-Finnish (FIN)

AF:

0.423

AC:

4463

AN:

10546

Middle Eastern (MID)

AF:

0.337

AC:

AN:

294

European-Non Finnish (NFE)

AF:

0.400

AC:

27154

AN:

67918

Other (OTH)

AF:

0.297

AC:

626

AN:

2108

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.503

Heterozygous variant carriers

1656

3312

4969

6625

8281

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

482

964

1446

1928

2410

<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:

0.329

Hom.:

2351

Bravo

AF:

0.299

Asia WGS

AF:

0.239

AC:

832

AN:

3474

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.92

CADD

Benign

2.0

(source)

DANN

Benign

0.50

PhyloP100

-0.41

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