NM_006950.3:c.1699A>G

Variant names:

Variant summary

Our verdict is Benign. Variant got -13 ACMG points: 0P and 13B. BP4_StrongBP6BS1BS2

The NM_006950.3(SYN1):c.1699A>G(p.Thr567Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00247 in 1,101,774 control chromosomes in the GnomAD database, including 48 homozygotes. There are 755 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 12/19 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars).

Frequency

Genomes: 𝑓 0.013 ( 24 hom., 427 hem., cov: 24)

Exomes 𝑓: 0.0012 ( 24 hom. 328 hem. )

Consequence

SYN1
NM_006950.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:2B:13

Conservation

PhyloP100: -0.218

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:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -13 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.00393793).

BP6

Variant X-47574285-T-C is Benign according to our data. Variant chrX-47574285-T-C is described in ClinVar as [Conflicting_classifications_of_pathogenicity]. Clinvar id is 41890.We mark this variant Likely_benign, oryginal submissions are: {Likely_benign=1, Benign=8, Uncertain_significance=1}. Variant chrX-47574285-T-C is described in Lovd as [Likely_benign]. Variant chrX-47574285-T-C is described in Lovd as [Benign].

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.0135 (1506/111841) while in subpopulation AFR AF= 0.0468 (1442/30814). AF 95% confidence interval is 0.0448. There are 24 homozygotes in gnomad4. There are 427 alleles in male gnomad4 subpopulation. Median coverage is 24. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 24 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SYN1	NM_006950.3 link	c.1699A>G	p.Thr567Ala	missense_variant	Exon 12 of 13	ENST00000295987.13	NP_008881.2	P17600-1
SYN1	NM_133499.2 link	c.1699A>G	p.Thr567Ala	missense_variant	Exon 12 of 13		NP_598006.1	P17600-2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SYN1	ENST00000295987.13 link	c.1699A>G	p.Thr567Ala	missense_variant	Exon 12 of 13	2	NM_006950.3	ENSP00000295987.7	P17600-1
SYN1	ENST00000340666.5 link	c.1699A>G	p.Thr567Ala	missense_variant	Exon 12 of 13	1		ENSP00000343206.4	P17600-2
SYN1	ENST00000640721.1 link	c.70+403A>G		intron_variant	Intron 1 of 1	5		ENSP00000492857.1	A0A1W2PSE9

Frequencies

GnomAD3 genomes

AF:

0.0135

AC:

1505

AN:

111798

Hom.:

Cov.:

AF XY:

0.0125

AC XY:

427

AN XY:

34240

show subpopulations

Gnomad AFR

AF:

0.0468

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00343

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.0129

Gnomad NFE

AF:

0.000303

Gnomad OTH

AF:

0.00597

GnomAD3 exomes

AF:

0.00113

AC:

AN:

53883

Hom.:

AF XY:

0.000326

AC XY:

AN XY:

18429

show subpopulations

Gnomad AFR exome

AF:

0.0459

Gnomad AMR exome

AF:

0.00201

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000152

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00122

AC:

1212

AN:

989933

Hom.:

Cov.:

AF XY:

0.00103

AC XY:

328

AN XY:

318907

show subpopulations

Gnomad4 AFR exome

AF:

0.0474

Gnomad4 AMR exome

AF:

0.00229

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000454

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000566

Gnomad4 OTH exome

AF:

0.00266

GnomAD4 genome

AF:

0.0135

AC:

1506

AN:

111841

Hom.:

Cov.:

AF XY:

0.0125

AC XY:

427

AN XY:

34295

show subpopulations

Gnomad4 AFR

AF:

0.0468

Gnomad4 AMR

AF:

0.00333

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000303

Gnomad4 OTH

AF:

0.00589

Alfa

AF:

0.00626

Hom.:

Bravo

AF:

0.0151

ExAC

AF:

0.00137

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:2Benign:13

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Benign:6

Apr 16, 2018

Athena Diagnostics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Genome Diagnostics Laboratory, University Medical Center Utrecht

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Mar 01, 2025

CeGaT Center for Human Genetics Tuebingen

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

SYN1: BS1, BS2 -

Laboratory of Diagnostic Genome Analysis, Leiden University Medical Center (LUMC)

Significance: Likely benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Aug 22, 2017

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Sep 17, 2024

ARUP Laboratories, Molecular Genetics and Genomics, ARUP Laboratories

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not specified

Uncertain:1Benign:3

Dec 15, 2016

GeneDx

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -

Jun 05, 2015

Genetic Services Laboratory, University of Chicago

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Clinical Genetics DNA and cytogenetics Diagnostics Lab, Erasmus MC, Erasmus Medical Center

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

- -

Jan 22, 2015

Eurofins Ntd Llc (ga)

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

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

Benign:2

Nov 21, 2018

Equipe Genetique des Anomalies du Developpement, Université de Bourgogne

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Feb 03, 2025

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Intellectual disability, X-linked 50

Uncertain:1

Jun 15, 2011

OMIM

Significance: Uncertain significance

Review Status: no assertion criteria provided

Collection Method: literature only

- -

SYN1-related disorder

Benign:1

Jun 18, 2021

PreventionGenetics, part of Exact Sciences

Significance: Benign

Review Status: no assertion criteria provided

Collection Method: clinical testing

This variant is classified as benign based on ACMG/AMP sequence variant interpretation guidelines (Richards et al. 2015 PMID: 25741868, with internal and published modifications). -

History of neurodevelopmental disorder

Benign:1

Jun 22, 2017

Ambry Genetics

Significance: Benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

General population or sub-population frequency is too high to be a pathogenic mutation based on disease/syndrome prevalence and penetrance;General population or subpopulation frequency is too high to be a pathogenic mutation based on disease/syndrome prevalence and penetrance;In silico models in agreement (benign);Subpopulation frequency in support of benign classification -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.066

BayesDel_addAF

Benign

-0.55

BayesDel_noAF

Benign

-0.52

CADD

Benign

DANN

Benign

0.67

DEOGEN2

Benign

0.15

T;.

FATHMM_MKL

Benign

0.56

LIST_S2

Benign

0.51

T;T

MetaRNN

Benign

0.0039

T;T

MetaSVM

Benign

-0.96

MutationAssessor

Benign

0.0

N;N

PrimateAI

Pathogenic

0.86

PROVEAN

Benign

-0.15

N;N

REVEL

Benign

0.27

Sift

Benign

0.43

T;T

Sift4G

Benign

0.90

T;T

Polyphen

0.0

B;B

Vest4

0.66

MVP

0.92

MPC

2.0

ClinPred

0.0060

GERP RS

0.73

Varity_R

0.039

gMVP

0.21

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