Genetic Variant SYN1:p.His657His (chrX-47574013-G-A) – ACMG Classification: Benign (-17 pts)

Variant summary

Our verdict is Benign. Variant got -17 ACMG points: 0P and 17B. BP4_StrongBP6_Very_StrongBP7BS2

The NM_006950.3(SYN1):c.1971C>T(p.His657His) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000682 in 1,144,075 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 24 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 0.000035 ( 0 hom., 0 hem., cov: 24)

Exomes 𝑓: 0.000072 ( 0 hom. 24 hem. )

Consequence

SYN1
NM_006950.3 synonymous

Scores

Clinical Significance

Likely benign criteria provided, multiple submitters, no conflicts B:2

Conservation

PhyloP100: 0.552

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 Benign. Variant got -17 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.67).

BP6

Variant X-47574013-G-A is Benign according to our data. Variant chrX-47574013-G-A is described in ClinVar as [Likely_benign]. Clinvar id is 1159939.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=0.552 with no splicing effect.

BS2

High Hemizygotes in GnomAdExome4 at 24 XL gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SYN1	NM_006950.3 link	c.1971C>T	p.His657His	synonymous_variant	Exon 12 of 13	ENST00000295987.13	NP_008881.2	P17600-1
SYN1	NM_133499.2 link	c.1971C>T	p.His657His	synonymous_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.1971C>T	p.His657His	synonymous_variant	Exon 12 of 13	2	NM_006950.3	ENSP00000295987.7	P17600-1
SYN1	ENST00000340666.5 link	c.1971C>T	p.His657His	synonymous_variant	Exon 12 of 13	1		ENSP00000343206.4	P17600-2
SYN1	ENST00000640721.1 link	c.70+675C>T		intron_variant	Intron 1 of 1	5		ENSP00000492857.1	A0A1W2PSE9

Frequencies

GnomAD3 genomes

AF:

0.0000355

AC:

AN:

112671

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

34825

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:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000753

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.0000718

AC:

AN:

1031353

Hom.:

Cov.:

AF XY:

0.0000725

AC XY:

AN XY:

331075

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000909

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000355

AC:

AN:

112722

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

34886

show subpopulations

Gnomad4 AFR

AF:

0.00

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:

0.0000753

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000151

ClinVar

Significance: Likely benign

Submissions summary: Benign:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not provided

Benign:1

Sep 01, 2023

CeGaT Center for Human Genetics Tuebingen

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

SYN1: BP4, BP7 -

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

Benign:1

Dec 07, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.67

CADD

Benign

9.3

DANN

Benign

0.93

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