rs869312674

Variant names:

Your query was ambiguous. Multiple possible variants found:

Variant summary

Our verdict is Pathogenic. Variant got 11 ACMG points: 11P and 0B. PM2PP3PP5_Very_Strong

The NM_006772.3(SYNGAP1):c.3583-6G>A variant causes a splice region, intron change. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a benign outcome for this variant. 3/3 splice prediction tools predicting alterations to normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★★).

Frequency

Genomes: not found (cov: 31)

Exomes 𝑓: 0.0 ( 0 hom. )

Failed GnomAD Quality Control

Consequence

SYNGAP1
NM_006772.3 splice_region, intron

Scores

Splicing: ADA: 0.9999

Clinical Significance

Pathogenic/Likely pathogenic criteria provided, multiple submitters, no conflicts P:8

Conservation

PhyloP100: 4.99

Variant links:

Genes affected

SYNGAP1 (HGNC:11497): (synaptic Ras GTPase activating protein 1) This gene encodes a Ras GTPase activating protein that is a member of the N-methyl-D-aspartate receptor complex. The N-terminal domain of the protein contains a Ras-GAP domain, a pleckstrin homology domain, and a C2 domain that may be involved in binding of calcium and phospholipids. The C-terminal domain consists of a ten histidine repeat region, serine and tyrosine phosphorylation sites, and a T/SXV motif required for postsynaptic scaffold protein interaction. The encoded protein negatively regulates Ras, Rap and alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor trafficking to the postsynaptic membrane to regulate synaptic plasticity and neuronal homeostasis. Allelic variants of this gene are associated with intellectual disability and autism spectrum disorder. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Nov 2016]

SYNGAP1 links:

SYNGAP1-AS1 (HGNC:53831): (SYNGAP1 antisense RNA 1)

SYNGAP1-AS1 links:

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ACMG classification

Classification made for transcript

Verdict is Pathogenic. Variant got 11 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

PP3

Multiple lines of computational evidence support a deleterious effect 4: Cadd, dbscSNV1_ADA, dbscSNV1_RF, max_spliceai [when BayesDel_noAF, Dann was below the threshold]

PP5

Variant 6-33446569-G-A is Pathogenic according to our data. Variant chr6-33446569-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 224094.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars. Variant chr6-33446569-G-A is described in Lovd as [Pathogenic].

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SYNGAP1	NM_006772.3 link	c.3583-6G>A		splice_region_variant, intron_variant	Intron 16 of 18	ENST00000646630.1	NP_006763.2	Q96PV0-1A0A1U9X8L0

Ensembl

Gene	Transcript	HGVSc	Effect	Exon rank	TSL	MANE	Protein	UniProt
SYNGAP1	ENST00000646630.1 link	c.3583-6G>A	splice_region_variant, intron_variant	Intron 16 of 18		NM_006772.3	ENSP00000496007.1	Q96PV0-1
SYNGAP1	ENST00000644458.1 link	c.3583-6G>A	splice_region_variant, intron_variant	Intron 16 of 18			ENSP00000495541.1	A0A2R8Y6T2
SYNGAP1	ENST00000449372.7 link	c.3541-12G>A	intron_variant	Intron 15 of 17	5		ENSP00000416519.4	B7ZCA0
SYNGAP1	ENST00000418600.7 link	c.3583-6G>A	splice_region_variant, intron_variant	Intron 16 of 18	5		ENSP00000403636.3	Q96PV0-2
SYNGAP1	ENST00000645250.1 link	c.3406-6G>A	splice_region_variant, intron_variant	Intron 14 of 16			ENSP00000494861.1	A0A2R8YDS2

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

Data not reliable, filtered out with message: AC0

AF:

0.00

AC:

AN:

1461346

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

726958

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:

0.00

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

Cov.:

Alfa

AF:

0.0000468

Hom.:

ClinVar

Significance: Pathogenic/Likely pathogenic

Submissions summary: Pathogenic:8

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Intellectual disability, autosomal dominant 5

Pathogenic:5

Dec 14, 2021

MGZ Medical Genetics Center

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Jan 21, 2025

HudsonAlpha Institute for Biotechnology, HudsonAlpha Institute for Biotechnology

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: research

- -

May 15, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

This sequence change falls in intron 16 of the SYNGAP1 gene. It does not directly change the encoded amino acid sequence of the SYNGAP1 protein. This variant is not present in population databases (gnomAD no frequency). This variant has been observed in individual(s) with SYNGAP1-related conditions (PMID: 25167861, 28554332). In at least one individual the variant was observed to be de novo. ClinVar contains an entry for this variant (Variation ID: 224094). Algorithms developed to predict the effect of sequence changes on RNA splicing suggest that this variant may disrupt the consensus splice site. For these reasons, this variant has been classified as Pathogenic. -

Jul 17, 2023

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Based on the classification scheme VCGS_Germline_v1.3.4, this variant is classified as Pathogenic. Following criteria are met: 0102 - Loss of function is a known mechanism of disease in this gene and is associated with intellectual developmental disorder 5 (MIM#612621). (I) 0107 - This gene is associated with autosomal dominant disease. (I) 0212 - Non-canonical splice site variant without proven consequence on splicing (no functional evidence available). mRNA analysis from an affected individual describes this variant as resulting in the formation of a cryptic acceptor site, and a frameshift outcome (p.Val1195Alafs*27)). However, no mRNA data or results were shown (PMID: 25167861). (SP) 0251 - This variant is heterozygous. (I) 0301 - Variant is absent from gnomAD (both v2 and v3). (SP) 0311 - An alternative nucleotide change at the same canonical splice site, is present in gnomAD (v2) (1 heterozygote, 0 homozygotes). (I) 0505 - Abnormal splicing in silico tools were inconclusive and affected nucleotide is highly conserved. (I) 0801 - This variant has strong previous evidence of pathogenicity in unrelated individuals. This variant has been reported once as a VUS (PMID: 28554332), but moreso as likely pathogenic and pathogenic, and observed de novo in several individuals with features including global developmental delay, intellectual disability and hypotonia (PMID: 25167861, PMID: 30800045, PMID: 33639450). (SP) 1203 - This variant has been shown to be de novo in the proband (parental status confirmed, by trio analysis). (SP) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign -

Apr 05, 2023

Institute of Human Genetics, University of Leipzig Medical Center

Significance: Likely pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Criteria applied: PS2,PS4_MOD,PM2_SUP -

SYNGAP1-related disorder

Pathogenic:1

May 23, 2023

PreventionGenetics, part of Exact Sciences

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The SYNGAP1 c.3583-6G>A variant is predicted to interfere with splicing. This variant has been reported in the heterozygous, de novo state in an individual with intellectual disability (APN-139; Figure S8 and Table S9, Redin et al. 2014. PubMed ID: 25167861), an individual with intellectual disability (moderate), autism spectrum disorder, speech delay and seizures (Table S2, Bowling et al. 2017. PubMed ID: 28554332), and in an individual with autism, severe cognitive disability, nystagmus, feeding issues, aspecific white matter hypersignal, seizures, and no speech (Patient ID 8, Lo Barco et al. 2021. PubMed ID: 33639450). This variant has not been reported in a large population database (http://gnomad.broadinstitute.org), indicating this variant is rare. This variant is interpreted as pathogenic. -

not provided

Pathogenic:1

Feb 27, 2024

GeneDx

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

Not observed at significant frequency in large population cohorts (gnomAD); In-silico analysis, which includes splice predictors and evolutionary conservation, is inconclusive as to whether the variant alters gene splicing. In the absence of RNA/functional studies, the actual effect of this sequence change is unknown.; This variant is associated with the following publications: (PMID: 28524815, 28721930, 25167861, 28554332, 33639450, 34070602) -

Intellectual disability

Pathogenic:1

Jul 25, 2014

Diagnostic Laboratory, Strasbourg University Hospital

Significance: Pathogenic

Review Status: criteria provided, single submitter

Collection Method: clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.20

CADD

Pathogenic

DANN

Benign

0.94

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

Splicing

Name

Calibrated prediction

Score

Prediction

dbscSNV1_ADA

Pathogenic

1.0

dbscSNV1_RF

Pathogenic

0.95

SpliceAI score (max)

1.0

Details are displayed if max score is > 0.2

DS_AG_spliceai

1.0

Position offset: 2

DS_AL_spliceai

0.46

Position offset: 6

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