6-33447872-G-T

Variant names:

• chr6-33447872-G-T
• rs1057520146
• NM_006772.3:c.3824G>T

Variant summary

Our verdict is Likely benign. Variant got -1 ACMG points: 3P and 4B. PM2 PP2 BP4_Moderate BP6_Moderate

The NM_006772.3(SYNGAP1):​c.3824G>T​(p.Arg1275Leu) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000715 in 1,399,108 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 7.1e-7 (0 hom.)
• Consequence: SYNGAP1 NM_006772.3 missense
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 1.25

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

ACMG classification

Verdict is Likely_benign. Variant got -1 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the SYNGAP1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 56 curated pathogenic missense variants (we use a threshold of 10). The gene has 112 curated benign missense variants. Gene score misZ: 5.6047 (above the threshold of 3.09). Trascript score misZ: 7.6762 (above the threshold of 3.09). GenCC associations: The gene is linked to autosomal dominant non-syndromic intellectual disability, complex neurodevelopmental disorder, intellectual disability, autosomal dominant 5, SYNGAP1-related developmental and epileptic encephalopathy, myoclonic-astatic epilepsy.
• BP4: Computational evidence support a benign effect (MetaRNN=0.19013739).
• BP6: Variant 6-33447872-G-T is Benign according to our data. Variant chr6-33447872-G-T is described in ClinVar as [Likely_benign]. Clinvar id is 377150.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SYNGAP1	NM_006772.3	c.3824G>T	p.Arg1275Leu	missense_variant	Exon 18 of 19	ENST00000646630.1	NP_006763.2

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SYNGAP1	ENST00000646630.1	c.3824G>T	p.Arg1275Leu	missense_variant	Exon 18 of 19		NM_006772.3	ENSP00000496007.1
SYNGAP1	ENST00000644458.1	c.3824G>T	p.Arg1275Leu	missense_variant	Exon 18 of 19			ENSP00000495541.1
SYNGAP1	ENST00000449372.7	c.3776G>T	p.Arg1259Leu	missense_variant	Exon 17 of 18	5		ENSP00000416519.4
SYNGAP1	ENST00000645250.1	c.3647G>T	p.Arg1216Leu	missense_variant	Exon 16 of 17			ENSP00000494861.1
SYNGAP1	ENST00000418600.7	c.3837G>T	p.Pro1279Pro	synonymous_variant	Exon 18 of 19	5		ENSP00000403636.3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 7.15e-7 AC: 1 AN: 1399108 Hom.: 0 Cov.: 30 AF XY: 0.00 AC XY: 0 AN XY: 690122

Gnomad4 AFR exome AF: 0.00

Gnomad4 AMR exome AF: 0.00

Gnomad4 ASJ exome AF: 0.00

Gnomad4 EAS exome AF: 0.0000280

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.: 32

ClinVar

Significance: Likely benign

Submissions summary: Benign:1

Revision: criteria provided, single submitter

Submissions by phenotype

not provided Benign:1

Jul 13, 2016

Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics

Significance: Likely benign

Review Status: criteria provided, single submitter

Collection Method: clinical testing

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Uncertain	0.45
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.39
CADD	Pathogenic	26
DANN	Uncertain	1.0
DEOGEN2	Benign	0.28	T;T;.;.;.;.;.
Eigen	Benign	0.16
Eigen_PC	Benign	0.22
FATHMM_MKL	Uncertain	0.96	D
LIST_S2	Uncertain	0.96	.;D;D;D;D;D;D
M_CAP	Benign	0.011	T
MetaRNN	Benign	0.19	T;T;T;T;T;T;T
MetaSVM	Benign	-1.0	T
PrimateAI	Uncertain	0.61	T
PROVEAN	Uncertain	-3.9	.;.;.;D;.;D;.
REVEL	Benign	0.12
Sift	Uncertain	0.0020	.;.;.;D;.;D;.
Sift4G	Uncertain	0.0060	.;D;.;D;D;D;.
Polyphen		0.80	P;P;.;.;P;.;.
Vest4		0.37, 0.40, 0.46
MutPred		0.15		Loss of MoRF binding (P = 0.1655);Loss of MoRF binding (P = 0.1655);Loss of MoRF binding (P = 0.1655);.;Loss of MoRF binding (P = 0.1655);.;.;
MVP		0.38
ClinPred		0.69	D
GERP RS		4.1
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.14
gMVP		0.46

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: rs1057520146; hg19: chr6-33415649;