rs749342768

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -6 ACMG points: 0P and 6B. BP4_ModerateBS2

The NM_006950.3(SYN1):c.1961G>A(p.Gly654Glu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000872 in 1,146,915 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 5 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 13/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★★).

Frequency

Genomes: 𝑓 0.000053 ( 0 hom., 2 hem., cov: 23)

Exomes 𝑓: 0.0000039 ( 0 hom. 3 hem. )

Consequence

SYN1
NM_006950.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:3

Conservation

PhyloP100: 2.67

Publications

0 publications found

Variant links:

Genes affected

SYN1 (HGNC:11494): (synapsin I) This gene is a member of the synapsin gene family. Synapsins encode neuronal phosphoproteins which associate with the cytoplasmic surface of synaptic vesicles. Family members are characterized by common protein domains, and they are implicated in synaptogenesis and the modulation of neurotransmitter release, suggesting a potential role in several neuropsychiatric diseases. This member of the synapsin family plays a role in regulation of axonogenesis and synaptogenesis. The protein encoded serves as a substrate for several different protein kinases and phosphorylation may function in the regulation of this protein in the nerve terminal. Mutations in this gene may be associated with X-linked disorders with primary neuronal degeneration such as Rett syndrome. Alternatively spliced transcript variants encoding different isoforms have been identified. [provided by RefSeq, Jul 2008]

SYN1 Gene-Disease associations (from GenCC):

X-linked complex neurodevelopmental disorder
Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
epilepsy, X-linked 1, with variable learning disabilities and behavior disorders
Inheritance: XL Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Ambry Genetics, G2P, Laboratory for Molecular Medicine, Labcorp Genetics (formerly Invitae), Orphanet

SYN1 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -6 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.08157846).

BS2

High Hemizygotes in GnomAd4 at 2 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SYN1	NM_006950.3 link	c.1961G>A	p.Gly654Glu	missense_variant	Exon 12 of 13	ENST00000295987.13	NP_008881.2
SYN1	NM_133499.2 link	c.1961G>A	p.Gly654Glu	missense_variant	Exon 12 of 13		NP_598006.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein
SYN1	ENST00000295987.13 link	c.1961G>A	p.Gly654Glu	missense_variant	Exon 12 of 13	2	NM_006950.3	ENSP00000295987.7
SYN1	ENST00000340666.5 link	c.1961G>A	p.Gly654Glu	missense_variant	Exon 12 of 13	1		ENSP00000343206.4
SYN1	ENST00000640721.1 link	c.70+665G>A		intron_variant	Intron 1 of 1	5		ENSP00000492857.1

Frequencies

GnomAD3 genomes

AF:

0.0000535

AC:

AN:

112221

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000194

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.00

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.00

AC:

AN:

87081

AF XY:

0.00

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000387

AC:

AN:

1034641

Hom.:

Cov.:

AF XY:

0.00000903

AC XY:

AN XY:

332355

show subpopulations

African (AFR)

AF:

0.0000828

AC:

AN:

24164

American (AMR)

AF:

0.00

AC:

AN:

26830

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

17960

East Asian (EAS)

AF:

0.0000379

AC:

AN:

26382

South Asian (SAS)

AF:

0.00

AC:

AN:

48431

European-Finnish (FIN)

AF:

0.00

AC:

AN:

28704

Middle Eastern (MID)

AF:

0.00

AC:

AN:

2845

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

815589

Other (OTH)

AF:

0.0000229

AC:

AN:

43736

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.775

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Hom

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000534

AC:

AN:

112274

Hom.:

Cov.:

AF XY:

0.0000579

AC XY:

AN XY:

34540

show subpopulations

African (AFR)

AF:

0.000194

AC:

AN:

30982

American (AMR)

AF:

0.00

AC:

AN:

10822

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2640

East Asian (EAS)

AF:

0.00

AC:

AN:

3489

South Asian (SAS)

AF:

0.00

AC:

AN:

2757

European-Finnish (FIN)

AF:

0.00

AC:

AN:

6199

Middle Eastern (MID)

AF:

0.00

AC:

AN:

215

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

52962

Other (OTH)

AF:

0.00

AC:

AN:

1531

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.512

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Genome Hom

Variant carriers

<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:

0.00

Hom.:

Bravo

AF:

0.0000378

ExAC

AF:

0.0000103

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Epilepsy, X-linked 1, with variable learning disabilities and behavior disorders

Uncertain:2

Nov 29, 2022

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with glutamic acid, which is acidic and polar, at codon 654 of the SYN1 protein (p.Gly654Glu). This variant is present in population databases (rs749342768, gnomAD 0.009%). This variant has not been reported in the literature in individuals affected with SYN1-related conditions. ClinVar contains an entry for this variant (Variation ID: 207477). Algorithms developed to predict the effect of missense changes on protein structure and function are either unavailable or do not agree on the potential impact of this missense change (SIFT: "Tolerated"; PolyPhen-2: "Not Available"; Align-GVGD: "Class C0"). In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Oct 31, 2018

Fulgent Genetics, Fulgent Genetics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

not provided

Uncertain:1

Jul 08, 2014

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

p.Gly654Glu (GGA>GAA): c.1961 G>A in exon 12 of the SYN1 gene (NM_133499.2) A variant of unknown significance has been identified in the SYN1 gene. The G654E variant has not been published as a mutation, nor has it been reported as a benign polymorphism to our knowledge. It was not observed in approximately 5,800 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. The G654E variant is a non-conservative amino acid substitution, which is likely to impact secondary protein structure as these residues differ in polarity, charge, size and/or other properties. However, this substitution occurs at a position that is not conserved across species, and in silico analysis predicts this variant likely does not alter the protein structure/function. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic mutation or a rare benign variant. The variant is found in EPILEPSY panel(s). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.20

BayesDel_addAF

Benign

-0.22

BayesDel_noAF

Benign

-0.56

CADD

Benign

(source)

DANN

Uncertain

0.98

DEOGEN2

Benign

0.21

T;.

FATHMM_MKL

Benign

0.61

LIST_S2

Benign

0.74

T;T

M_CAP

Benign

0.046

MetaRNN

Benign

0.082

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

0.34

N;N

PhyloP100

2.7

PrimateAI

Pathogenic

0.83

PROVEAN

Benign

-1.0

N;N

REVEL

Benign

0.13

Sift

Uncertain

0.011

D;D

Sift4G

Benign

0.41

T;T

Polyphen

0.0050

B;B

Vest4

0.36

MVP

0.24

MPC

2.4

ClinPred

0.34

GERP RS

3.1

Varity_R

0.22

gMVP

0.29

Mutation Taster

=80/20

polymorphism

(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

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over