rs185229386

Variant names:

• chrX-47575250-T-C
• rs185229386
• NM_006950.3:c.1183A>G

Variant summary

Our verdict is Uncertain significance. Variant got 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_006950.3(SYN1):​c.1183A>G​(p.Ile395Val) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000177 in 112,771 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 0.000018 (0 hom., 0 hem., cov: 23)
• Consequence: SYN1 NM_006950.3 missense
• Clinical Significance: Uncertain significance criteria provided, multiple submitters, no conflicts U:3
• Conservation: PhyloP100: 2.47

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]

ENSG00000283743 (HGNC:):

ACMG classification

Verdict is Uncertain_significance. Variant got 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.14625537).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SYN1	NM_006950.3	c.1183A>G	p.Ile395Val	missense_variant	Exon 10 of 13	ENST00000295987.13	NP_008881.2
SYN1	NM_133499.2	c.1183A>G	p.Ile395Val	missense_variant	Exon 10 of 13		NP_598006.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SYN1	ENST00000295987.13	c.1183A>G	p.Ile395Val	missense_variant	Exon 10 of 13	2	NM_006950.3	ENSP00000295987.7
SYN1	ENST00000340666.5	c.1183A>G	p.Ile395Val	missense_variant	Exon 10 of 13	1		ENSP00000343206.4
ENSG00000283743	ENST00000638776.2	n.3639A>G		non_coding_transcript_exon_variant	Exon 16 of 16	5

Frequencies

GnomAD3 genomes AF: 0.0000177 AC: 2 AN: 112718 Hom.: 0 Cov.: 23 AF XY: 0.00 AC XY: 0 AN XY: 34864

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: 0.0000376

Gnomad OTH AF: 0.00

GnomAD4 exome Cov.: 32

GnomAD4 genome AF: 0.0000177 AC: 2 AN: 112771 Hom.: 0 Cov.: 23 AF XY: 0.00 AC XY: 0 AN XY: 34927

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: 0.0000376

Gnomad4 OTH AF: 0.00

Bravo AF: 0.0000189

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:3

Revision: criteria provided, multiple submitters, no conflicts

Submissions by phenotype

not specified Uncertain:1

Aug 19, 2015

Genomic Diagnostic Laboratory, Division of Genomic Diagnostics, Children's Hospital of Philadelphia

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

not provided Uncertain:1

Jun 15, 2017

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

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

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

Oct 15, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change replaces isoleucine, which is neutral and non-polar, with valine, which is neutral and non-polar, at codon 395 of the SYN1 protein (p.Ile395Val). This variant is not present in population databases (gnomAD no frequency). 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: 252671). 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. 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. -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.27
BayesDel_addAF	Benign	-0.32	T
BayesDel_noAF	Benign	-0.70
CADD	Benign	20
DANN	Uncertain	0.99
DEOGEN2	Benign	0.31	T;.
FATHMM_MKL	Benign	0.66	D
LIST_S2	Uncertain	0.94	D;D
M_CAP	Benign	0.013	T
MetaRNN	Benign	0.15	T;T
MetaSVM	Benign	-1.0	T
MutationAssessor	Uncertain	2.2	M;M
PrimateAI	Benign	0.48	T
PROVEAN	Benign	-0.74	N;N
REVEL	Benign	0.052
Sift	Benign	0.072	T;T
Sift4G	Benign	0.10	T;T
Polyphen		0.17	B;B
Vest4		0.26
MVP		0.46
MPC		0.71
ClinPred		0.66	D
GERP RS		4.0
Varity_R		0.12
gMVP		0.83

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

Other links and lift over

dbSNP: rs185229386; hg19: chrX-47434649;