chr6-33438190-C-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BS2

The NM_006772.3(SYNGAP1):c.1285C>T(p.Arg429Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000403 in 1,614,096 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Conflicting classifications of pathogenicity (no stars). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R429Q) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000020 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000042 ( 0 hom. )

Consequence

SYNGAP1
NM_006772.3 missense

Scores

Clinical Significance

Conflicting classifications of pathogenicity criteria provided, conflicting classifications U:4B:1

Conservation

PhyloP100: 1.74

Publications

1 publications found

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:

MIR5004 (HGNC:43532): (microRNA 5004) microRNAs (miRNAs) are short (20-24 nt) non-coding RNAs that are involved in post-transcriptional regulation of gene expression in multicellular organisms by affecting both the stability and translation of mRNAs. miRNAs are transcribed by RNA polymerase II as part of capped and polyadenylated primary transcripts (pri-miRNAs) that can be either protein-coding or non-coding. The primary transcript is cleaved by the Drosha ribonuclease III enzyme to produce an approximately 70-nt stem-loop precursor miRNA (pre-miRNA), which is further cleaved by the cytoplasmic Dicer ribonuclease to generate the mature miRNA and antisense miRNA star (miRNA*) products. The mature miRNA is incorporated into a RNA-induced silencing complex (RISC), which recognizes target mRNAs through imperfect base pairing with the miRNA and most commonly results in translational inhibition or destabilization of the target mRNA. The RefSeq represents the predicted microRNA stem-loop. [provided by RefSeq, Sep 2009]

MIR5004 links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -4 ACMG points.

BS2

High AC in GnomAdExome4 at 62 AD,Unknown gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SYNGAP1	NM_006772.3 link	c.1285C>T	p.Arg429Trp	missense_variant	Exon 8 of 19	ENST00000646630.1	NP_006763.2	Q96PV0-1A0A1U9X8L0

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SYNGAP1	ENST00000646630.1 link	c.1285C>T	p.Arg429Trp	missense_variant	Exon 8 of 19		NM_006772.3	ENSP00000496007.1	Q96PV0-1
SYNGAP1	ENST00000644458.1 link	c.1285C>T	p.Arg429Trp	missense_variant	Exon 8 of 19			ENSP00000495541.1	A0A2R8Y6T2
SYNGAP1	ENST00000449372.7 link	c.1285C>T	p.Arg429Trp	missense_variant	Exon 8 of 18	5		ENSP00000416519.4	B7ZCA0
SYNGAP1	ENST00000418600.7 link	c.1285C>T	p.Arg429Trp	missense_variant	Exon 8 of 19	5		ENSP00000403636.3	Q96PV0-2
SYNGAP1	ENST00000645250.1 link	c.1108C>T	p.Arg370Trp	missense_variant	Exon 6 of 17			ENSP00000494861.1	A0A2R8YDS2

Frequencies

GnomAD3 genomes

AF:

0.0000197

AC:

AN:

152206

Hom.:

Cov.:

show subpopulations

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:

0.0000441

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000281

AC:

AN:

249188

AF XY:

0.0000148

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.0000544

Gnomad FIN exome

AF:

0.0000462

Gnomad NFE exome

AF:

0.0000359

Gnomad OTH exome

AF:

0.000163

GnomAD4 exome

AF:

0.0000424

AC:

AN:

1461890

Hom.:

Cov.:

AF XY:

0.0000358

AC XY:

AN XY:

727246

show subpopulations

African (AFR)

AF:

0.0000299

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.0000252

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86258

European-Finnish (FIN)

AF:

0.0000187

AC:

AN:

53420

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

0.0000486

AC:

AN:

1112010

Other (OTH)

AF:

0.0000828

AC:

AN:

60394

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.478

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.0000197

AC:

AN:

152206

Hom.:

Cov.:

AF XY:

0.0000134

AC XY:

AN XY:

74350

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41444

American (AMR)

AF:

0.00

AC:

AN:

15278

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3470

East Asian (EAS)

AF:

0.00

AC:

AN:

5202

South Asian (SAS)

AF:

0.00

AC:

AN:

4836

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10622

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000441

AC:

AN:

68032

Other (OTH)

AF:

0.00

AC:

AN:

2094

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.458

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000847

Hom.:

Bravo

AF:

0.0000227

ExAC

AF:

0.00000824

AC:

ClinVar

Significance: Conflicting classifications of pathogenicity

Submissions summary: Uncertain:4Benign:1

Revision: criteria provided, conflicting classifications

LINK: link

Submissions by phenotype

not provided

Uncertain:2

Aug 01, 2016

CeGaT Center for Human Genetics Tuebingen

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Oct 24, 2023

GeneDx

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

In silico analysis supports that this missense variant has a deleterious effect on protein structure/function; Has not been previously published as pathogenic or benign to our knowledge -

Intellectual disability, autosomal dominant 5

Uncertain:1Benign:1

Feb 26, 2021

New York Genome Center

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

The de novo heterozygous missense c.1285C>T (p.Arg429Trp) variant identified in the SYNGAP1 gene of this individual has not been reported in affected individuals in the literature. It has been reported in the ClinVar database as a variant of uncertain significance (2) and likely benign (1) [Variation ID:374457]. The variant has 0.00001971 allele frequency in the gnomAD(v3) database (3 out of 152,206 heterozygous alleles, no homozygotes) suggesting it is not a common benign allele in the populations represented in that database. The affected residue is not well conserved. In silico tools provide conflicting predictions about potential pathogenicity of this variant [CADD score = 25.9, REVEL score =0.282]. Functional studies to evaluate the functional consequences of this variant have not been reported. Given the lack of compelling evidence about its pathogenicity, the de novo heterozygous missense c.1285C>T (p.Arg429Trp) variant identified in the SYNGAP1 gene is reported here as a variant of uncertain significance. -

Jun 23, 2023

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Likely benign

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Global developmental delay

Uncertain:1

Feb 21, 2017

Claritas Genomics

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Uncertain

0.50

BayesDel_addAF

Benign

0.0037

BayesDel_noAF

Uncertain

-0.060

CADD

Pathogenic

(source)

DANN

Pathogenic

1.0

DEOGEN2

Uncertain

0.65

D;D;.;.;.;.;.;.

Eigen

Uncertain

0.46

Eigen_PC

Uncertain

0.42

FATHMM_MKL

Uncertain

0.93

LIST_S2

Pathogenic

0.98

.;D;D;D;D;D;D;D

M_CAP

Benign

0.011

MetaRNN

Uncertain

0.64

D;D;D;D;D;D;D;D

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.5

L;L;.;.;L;L;.;.

PhyloP100

1.7

PrimateAI

Uncertain

0.75

PROVEAN

Uncertain

-3.1

.;.;.;D;.;D;D;.

REVEL

Benign

0.28

Sift

Benign

0.031

.;.;.;D;.;D;D;.

Sift4G

Uncertain

0.013

.;D;.;D;D;D;D;.

Polyphen

1.0

D;D;.;D;D;D;.;.

Vest4

0.52, 0.51, 0.54, 0.50

MutPred

0.65

Loss of solvent accessibility (P = 0.1077);Loss of solvent accessibility (P = 0.1077);Loss of solvent accessibility (P = 0.1077);Loss of solvent accessibility (P = 0.1077);Loss of solvent accessibility (P = 0.1077);Loss of solvent accessibility (P = 0.1077);.;.;

MVP

0.61

MPC

2.3

ClinPred

0.71

GERP RS

4.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.47

gMVP

0.86

Mutation Taster

=57/43

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.11

Details are displayed if max score is > 0.2

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

Publications

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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over