chr6-33451776-C-T

Variant names:

• chr6-33451776-C-T
• rs199694815
• NM_006772.3:c.3902C>T

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_006772.3(SYNGAP1):​c.3902C>T​(p.Pro1301Leu) variant causes a missense change. The variant allele was found at a frequency of 0.00000186 in 1,613,468 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. P1301H) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 31)
  • Exomes 𝑓: 0.0000014 (0 hom.)
• Consequence: SYNGAP1 NM_006772.3 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 6.83
• Publications: 2 publications found

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

Our verdict: Uncertain_significance. The variant received 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.2281813).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_006772.3. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SYNGAP1	NM_006772.3	MANE Select	c.3902C>T	p.Pro1301Leu	missense	Exon 19 of 19	NP_006763.2
	SYNGAP1	NM_001130066.2		c.3853C>T	p.Pro1285Ser	missense	Exon 18 of 18	NP_001123538.1
	SYNGAP1-AS1	NR_174954.1		n.136+2494G>A		intron	N/A

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SYNGAP1	ENST00000646630.1	MANE Select	c.3902C>T	p.Pro1301Leu	missense	Exon 19 of 19	ENSP00000496007.1
	SYNGAP1	ENST00000644458.1		c.3901C>T	p.Pro1301Ser	missense	Exon 19 of 19	ENSP00000495541.1
	SYNGAP1	ENST00000449372.7	TSL:5	c.3853C>T	p.Pro1285Ser	missense	Exon 18 of 18	ENSP00000416519.4

Frequencies

GnomAD3 genomes AF: 0.00000658 AC: 1 AN: 152038 Hom.: 0 Cov.: 31

Gnomad AFR AF: 0.0000242

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: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00000137 AC: 2 AN: 1461430 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 726978

African (AFR) AF: 0.00 AC: 0 AN: 33466

American (AMR) AF: 0.00 AC: 0 AN: 44692

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26126

East Asian (EAS) AF: 0.00 AC: 0 AN: 39694

South Asian (SAS) AF: 0.00 AC: 0 AN: 86196

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53382

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5692

European-Non Finnish (NFE) AF: 0.00000180 AC: 2 AN: 1111820

Other (OTH) AF: 0.00 AC: 0 AN: 60362

GnomAD4 genome AF: 0.00000658 AC: 1 AN: 152038 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 74254

African (AFR) AF: 0.0000242 AC: 1 AN: 41352

American (AMR) AF: 0.00 AC: 0 AN: 15270

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5192

South Asian (SAS) AF: 0.00 AC: 0 AN: 4830

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10620

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 316

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67990

Other (OTH) AF: 0.00 AC: 0 AN: 2084

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000756

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.099
BayesDel_addAF	Benign	-0.11	T
BayesDel_noAF	Benign	-0.39
CADD	Uncertain	25
DANN	Uncertain	0.99
DEOGEN2	Benign	0.054	T
Eigen	Benign	0.14
Eigen_PC	Benign	0.19
FATHMM_MKL	Uncertain	0.87	D
LIST_S2	Benign	0.85	T
M_CAP	Uncertain	0.094	D
MetaRNN	Benign	0.23	T
MetaSVM	Benign	-0.85	T
MutationAssessor	Benign	0.55	N
PhyloP100		6.8
PrimateAI	Uncertain	0.77	T
PROVEAN	Benign	-1.5	N
REVEL	Benign	0.082
Sift	Uncertain	0.0050	D
Sift4G	Uncertain	0.0060	D
Polyphen		0.017	B
Vest4		0.29
MutPred		0.18		Loss of catalytic residue at P1300 (P = 0.0188)
MVP		0.082
ClinPred		0.67	D
GERP RS		3.5
RBP_binding_hub_radar		0.0
RBP_regulation_power_radar		1.7
Varity_R		0.15
gMVP		0.49
Mutation Taster		=74/26	polymorphism

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

Other links and lift over

dbSNP: rs199694815; hg19: chr6-33419553; COSMIC: COSV99537810; COSMIC: COSV99537810;