rs1294224206

Positions:

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 4P and 2B. PM1PM2BP4_Moderate

The NM_006950.3(SYN1):c.184T>G(p.Ser62Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000009 in 111,139 control chromosomes in the GnomAD database, with no homozygous occurrence. There are no hemizygote samples in GnomAD. In-silico tool predicts a benign outcome for this variant. 12/20 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.0000090 ( 0 hom., 0 hem., cov: 22)

Consequence

SYN1
NM_006950.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.0750

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 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM1

In a modified_residue Phosphoserine (size 0) in uniprot entity SYN1_HUMAN

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.07627514).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SYN1	NM_006950.3 linkuse as main transcript	c.184T>G	p.Ser62Ala	missense_variant	1/13	ENST00000295987.13	NP_008881.2
SYN1	NM_133499.2 linkuse as main transcript	c.184T>G	p.Ser62Ala	missense_variant	1/13		NP_598006.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SYN1	ENST00000295987.13 linkuse as main transcript	c.184T>G	p.Ser62Ala	missense_variant	1/13	2	NM_006950.3	ENSP00000295987	P3	P17600-1
SYN1	ENST00000340666.5 linkuse as main transcript	c.184T>G	p.Ser62Ala	missense_variant	1/13	1		ENSP00000343206	A1	P17600-2

Frequencies

GnomAD3 genomes

AF:

0.00000900

AC:

AN:

111139

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

33433

show subpopulations

Gnomad AFR

AF:

0.0000327

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

GnomAD4 exome

Cov.:

GnomAD4 genome

AF:

0.00000900

AC:

AN:

111139

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

33433

show subpopulations

Gnomad4 AFR

AF:

0.0000327

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000151

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

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

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Mar 11, 2023

This sequence change replaces serine, which is neutral and polar, with alanine, which is neutral and non-polar, at codon 62 of the SYN1 protein (p.Ser62Ala). 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. An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant¬† is likely to be tolerated. ClinVar contains an entry for this variant (Variation ID: 465094). This variant has not been reported in the literature in individuals affected with SYN1-related conditions. This variant is not present in population databases (gnomAD no frequency). -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.067

BayesDel_addAF

Benign

-0.38

BayesDel_noAF

Benign

-0.79

CADD

Benign

DANN

Benign

0.74

DEOGEN2

Benign

0.20

T;.

FATHMM_MKL

Benign

0.40

LIST_S2

Benign

0.47

T;T

M_CAP

Uncertain

0.15

MetaRNN

Benign

0.076

T;T

MetaSVM

Benign

-1.0

MutationAssessor

Benign

-0.14

N;N

MutationTaster

Benign

0.99

N;N

PrimateAI

Pathogenic

0.79

PROVEAN

Benign

-0.86

N;N

REVEL

Benign

0.057

Sift

Benign

0.21

T;T

Sift4G

Benign

0.32

T;T

Polyphen

0.0

B;B

Vest4

0.18

MutPred

0.13

Loss of glycosylation at S62 (P = 0.0031);Loss of glycosylation at S62 (P = 0.0031);

MVP

0.40

MPC

0.57

ClinPred

0.040

GERP RS

2.3

Varity_R

0.093

gMVP

0.26

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over