chrX-47572939-G-A

Position:

• chrX-47572939-G-A

Variant summary

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

The ENST00000340666.5(SYN1):​c.2005C>T​(p.Pro669Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 10/14 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P669L) has been classified as Uncertain significance.

• Frequency: Genomes: not found (cov: 22)
• Consequence: SYN1 ENST00000340666.5 missense
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.25

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]

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=0.19218919).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SYN1	NM_006950.3	c.2043C>T	p.Ser681=	synonymous_variant	13/13	ENST00000295987.13	NP_008881.2
SYN1	NM_133499.2	c.2005C>T	p.Pro669Ser	missense_variant	13/13		NP_598006.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SYN1	ENST00000340666.5	c.2005C>T	p.Pro669Ser	missense_variant	13/13	1		ENSP00000343206	A1
SYN1	ENST00000295987.13	c.2043C>T	p.Ser681=	synonymous_variant	13/13	2	NM_006950.3	ENSP00000295987	P3
SYN1	ENST00000640721.1	c.93C>T	p.Ser31=	synonymous_variant	2/2	5		ENSP00000492857

Frequencies

GnomAD3 genomes Cov.: 22

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 22

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Mar 12, 2023

Not observed at significant frequency in large population cohorts (gnomAD); In silico analysis supports that this missense variant does not alter protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_addAF	Benign	-0.022	T
BayesDel_noAF	Benign	-0.27
CADD	Benign	12
DANN	Uncertain	0.99
FATHMM_MKL	Benign	0.73	D
LIST_S2	Benign	0.51	T
M_CAP	Benign	0.028	D
MetaRNN	Benign	0.19	T
MetaSVM	Benign	-1.1	T
MutationTaster	Benign	1.0	D;N
PROVEAN	Benign	0.060	N
REVEL	Benign	0.049
Sift	Pathogenic	0.0	D
Sift4G	Pathogenic	0.0	D
Polyphen		0.52	P
Vest4		0.32
MutPred		0.32		Gain of phosphorylation at P669 (P = 0.0276);
MVP		0.46
ClinPred		0.84	D
GERP RS		4.8

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

No publications associated with this variant yet.

Other links and lift over

hg19: chrX-47432338;