NM_006950.3:c.838-3C>T

Variant names:

• chrX-47576643-G-A
• rs797046021
• NM_006950.3:c.838-3C>T

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2 BP4_Strong

The NM_006950.3(SYN1):​c.838-3C>T variant causes a splice region, intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000182 in 1,098,003 control chromosomes in the GnomAD database, with no homozygous occurrence. There are 1 hemizygotes in GnomAD. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Uncertain significance (★).

• Frequency:
  • Genomes: not found (cov: 23)
  • Exomes 𝑓: 0.0000018 (0 hom. 1 hem.)
• Consequence: SYN1 NM_006950.3 splice_region, intron
• Scores: Splicing: ADA: 0.0004007
• Clinical Significance: Uncertain significance criteria provided, single submitter U:1
• Conservation: PhyloP100: 3.07
• Publications: 0 publications found

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 Gene-Disease associations (from GenCC):

• X-linked complex neurodevelopmental disorder

  Inheritance: XL Classification: DEFINITIVE Submitted by: ClinGen
• epilepsy, X-linked 1, with variable learning disabilities and behavior disorders

  Inheritance: XL Classification: STRONG, MODERATE, SUPPORTIVE Submitted by: Labcorp Genetics (formerly Invitae), Orphanet, Ambry Genetics, Laboratory for Molecular Medicine, G2P
• intellectual disability, X-linked 50

  Inheritance: XL Classification: STRONG Submitted by: PanelApp Australia

ENSG00000283743 (HGNC:):

ACMG classification

Our verdict: Likely_benign. The variant received -2 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.63).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006950.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SYN1	NM_006950.3	MANE Select	c.838-3C>T		splice_region intron	N/A	NP_008881.2	P17600-1
	SYN1	NM_133499.2		c.838-3C>T		splice_region intron	N/A	NP_598006.1	P17600-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SYN1	ENST00000295987.13	TSL:2 MANE Select	c.838-3C>T		splice_region intron	N/A	ENSP00000295987.7	P17600-1
	SYN1	ENST00000340666.5	TSL:1	c.838-3C>T		splice_region intron	N/A	ENSP00000343206.4	P17600-2
	SYN1	ENST00000950906.1		c.838-3C>T		splice_region intron	N/A	ENSP00000620965.1

Frequencies

GnomAD3 genomes Cov.: 23

GnomAD4 exome AF: 0.00000182 AC: 2 AN: 1098003 Hom.: 0 Cov.: 33 AF XY: 0.00000275 AC XY: 1 AN XY: 363409

African (AFR) AF: 0.00 AC: 0 AN: 26396

American (AMR) AF: 0.00 AC: 0 AN: 35207

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 19386

East Asian (EAS) AF: 0.00 AC: 0 AN: 30206

South Asian (SAS) AF: 0.0000185 AC: 1 AN: 54126

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 40517

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 3963

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 842126

Other (OTH) AF: 0.0000217 AC: 1 AN: 46076

GnomAD4 genome Cov.: 23

ClinVar

ClinVar submissions

Significance: Uncertain significance

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	1	-	not specified (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.63
CADD	Benign	8.6
DANN	Benign	0.64
PhyloP100		3.1

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.00040
dbscSNV1_RF	Benign	0.14
SpliceAI score (max)		0.040		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs797046021; hg19: chrX-47436042;