Variant summary

Our verdict is Benign. The variant received -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BS1BS2

The NM_006950.3(SYN1):c.987G>A(p.Thr329Thr) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000843 in 1,210,494 control chromosomes in the GnomAD database, including 1 homozygotes. There are 41 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★).

Frequency

Genomes: 𝑓 0.0000089 ( 0 hom., 0 hem., cov: 23)

Exomes 𝑓: 0.000092 ( 1 hom. 41 hem. )

Consequence

SYN1
NM_006950.3 synonymous

Scores

Clinical Significance

Likely benign criteria provided, multiple submitters, no conflicts B:3

Conservation

PhyloP100: -6.74

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:

ENSG00000283743 (HGNC:):

ENSG00000283743 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Benign. The variant received -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.66).

BP6

Variant X-47576400-C-T is Benign according to our data. Variant chrX-47576400-C-T is described in ClinVar as Likely_benign. ClinVar VariationId is 436897.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-6.74 with no splicing effect.

BS1

Variant frequency is greater than expected in population eas. GnomAdExome4 allele frequency = 0.000092 (101/1098189) while in subpopulation EAS AF = 0.00315 (95/30206). AF 95% confidence interval is 0.00263. There are 1 homozygotes in GnomAdExome4. There are 41 alleles in the male GnomAdExome4 subpopulation. Median coverage is 33. This position passed quality control check.

BS2

High Hemizygotes in GnomAdExome4 at 41 XL gene

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006950.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SYN1	NM_006950.3	MANE Select	c.987G>A	p.Thr329Thr	synonymous	Exon 8 of 13	NP_008881.2
	SYN1	NM_133499.2		c.987G>A	p.Thr329Thr	synonymous	Exon 8 of 13	NP_598006.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
SYN1	ENST00000295987.13	TSL:2 MANE Select	c.987G>A	p.Thr329Thr	synonymous	Exon 8 of 13	ENSP00000295987.7
SYN1	ENST00000340666.5	TSL:1	c.987G>A	p.Thr329Thr	synonymous	Exon 8 of 13	ENSP00000343206.4
ENSG00000283743	ENST00000638776.2	TSL:5	n.3443G>A		non_coding_transcript_exon	Exon 14 of 16

Frequencies

GnomAD3 genomes

AF:

0.00000890

AC:

AN:

112305

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000279

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:

0.0000818

AC:

AN:

183338

AF XY:

0.000118

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.000794

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000244

Gnomad OTH exome

AF:

0.000221

GnomAD4 exome

AF:

0.0000920

AC:

101

AN:

1098189

Hom.:

Cov.:

AF XY:

0.000113

AC XY:

AN XY:

363543

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26401

American (AMR)

AF:

0.00

AC:

AN:

35202

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

19386

East Asian (EAS)

AF:

0.00315

AC:

AN:

30206

South Asian (SAS)

AF:

0.0000369

AC:

AN:

54143

European-Finnish (FIN)

AF:

0.00

AC:

AN:

40529

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4137

European-Non Finnish (NFE)

AF:

0.00000119

AC:

AN:

842089

Other (OTH)

AF:

0.0000651

AC:

AN:

46096

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.479

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

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:

0.00000890

AC:

AN:

112305

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

34443

show subpopulations

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR)

AF:

0.00

AC:

AN:

30919

American (AMR)

AF:

0.00

AC:

AN:

10642

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

2655

East Asian (EAS)

AF:

0.000279

AC:

AN:

3581

South Asian (SAS)

AF:

0.00

AC:

AN:

2723

European-Finnish (FIN)

AF:

0.00

AC:

AN:

6103

Middle Eastern (MID)

AF:

0.00

AC:

AN:

240

European-Non Finnish (NFE)

AF:

0.00

AC:

AN:

53247

Other (OTH)

AF:

0.00

AC:

AN:

1508

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.375

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

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:

0.0000491

EpiCase

AF:

0.000109

EpiControl

AF:

0.00

ClinVar

ClinVar submissions as Germline

Significance:Likely benign

Revision:criteria provided, multiple submitters, no conflicts

View on ClinVar

Pathogenic

VUS

Benign

Condition

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

not specified (1)

SYN1-related disorder (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.66

CADD

Benign

1.4

(source)

DANN

Benign

0.71

PhyloP100

-6.7

Mutation Taster

=100/0

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.010

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

rs371126022

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

ClinVar submissions as Germline

Computational scores

Splicing

Publications

Other links and lift over