rs8140818

Positions:

• chr22-32832736-T-C

Variant summary

Our verdict is Benign. Variant got -12 ACMG points: 0P and 12B. BP4_Strong BA1

The NM_003490.4(SYN3):​c.711+32179A>G variant causes a intron change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.103 in 151,814 control chromosomes in the GnomAD database, including 927 homozygotes. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar.

• Frequency: Genomes: 𝑓 0.10 (927 hom., cov: 31)
• Consequence: SYN3 NM_003490.4 intron
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: -1.10

Genes affected

TIMP3 (HGNC:11822): (TIMP metallopeptidase inhibitor 3) This gene belongs to the TIMP gene family. The proteins encoded by this gene family are inhibitors of the matrix metalloproteinases, a group of peptidases involved in degradation of the extracellular matrix (ECM). Expression of this gene is induced in response to mitogenic stimulation and this netrin domain-containing protein is localized to the ECM. Mutations in this gene have been associated with the autosomal dominant disorder Sorsby's fundus dystrophy. [provided by RefSeq, Jul 2008]

SYN3 (HGNC:11496): (synapsin III) 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. The protein encoded by this gene shares the synapsin family domain model, with domains A, C, and E exhibiting the highest degree of conservation. The protein contains a unique domain J, located between domains C and E. Based on this gene's localization to 22q12.3, a possible schizophrenia susceptibility locus, and the established neurobiological roles of the synapsins, this family member may represent a candidate gene for schizophrenia. The TIMP3 gene is located within an intron of this gene and is transcribed in the opposite direction. Alternative splicing of this gene results in multiple splice variants that encode different isoforms. [provided by RefSeq, Oct 2008]

ACMG classification

Verdict is Benign. Variant got -12 ACMG points.

• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.94).
• BA1: GnomAd4 highest subpopulation (AFR) allele frequency at 95% confidence interval = 0.165 is higher than 0.05.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
TIMP3	NM_000362.5	c.122-16716T>C		intron_variant		ENST00000266085.7	NP_000353.1
SYN3	NM_003490.4	c.711+32179A>G		intron_variant		ENST00000358763.7	NP_003481.3

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
TIMP3	ENST00000266085.7	c.122-16716T>C		intron_variant		1	NM_000362.5	ENSP00000266085	P1
SYN3	ENST00000358763.7	c.711+32179A>G		intron_variant		5	NM_003490.4	ENSP00000351614	P1
SYN3	ENST00000462268.1	n.225+32179A>G		intron_variant, non_coding_transcript_variant		3

Frequencies

GnomAD3 genomes AF: 0.102 AC: 15543 AN: 151696 Hom.: 924 Cov.: 31

Gnomad AFR AF: 0.168

Gnomad AMI AF: 0.0681

Gnomad AMR AF: 0.0746

Gnomad ASJ AF: 0.111

Gnomad EAS AF: 0.0526

Gnomad SAS AF: 0.0716

Gnomad FIN AF: 0.0832

Gnomad MID AF: 0.136

Gnomad NFE AF: 0.0781

Gnomad OTH AF: 0.0983

We have no GnomAD4 exomes data on this position. Probably position not covered by the project.

GnomAD4 genome AF: 0.103 AC: 15564 AN: 151814 Hom.: 927 Cov.: 31 AF XY: 0.102 AC XY: 7563 AN XY: 74170

Gnomad4 AFR AF: 0.168

Gnomad4 AMR AF: 0.0743

Gnomad4 ASJ AF: 0.111

Gnomad4 EAS AF: 0.0528

Gnomad4 SAS AF: 0.0713

Gnomad4 FIN AF: 0.0832

Gnomad4 NFE AF: 0.0781

Gnomad4 OTH AF: 0.0987

Alfa AF: 0.0912 Hom.: 98

Bravo AF: 0.107

Asia WGS AF: 0.0610 AC: 212 AN: 3478

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.94
CADD	Benign	0.51
DANN	Benign	0.24

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: rs8140818; hg19: chr22-33228722;