rs1555226395

Variant names:

• chr12-79448945-G-A
• rs1555226395
• NM_005639.3:c.1090G>A

Variant summary

Our verdict is Likely pathogenic. Variant got 9 ACMG points: 9P and 0B. PM1 PM2 PP2 PP3_Moderate PP5_Moderate

The NM_005639.3(SYT1):​c.1090G>A​(p.Asp364Asn) variant causes a missense change involving the alteration of a conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. In-silico tool predicts a pathogenic outcome for this variant. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SYT1 NM_005639.3 missense
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 9.99

Genes affected

SYT1 (HGNC:11509): (synaptotagmin 1) This gene encodes a member of the synaptotagmin protein family. The synaptotagmins are integral membrane proteins of synaptic vesicles that serve as calcium sensors in the process of vesicular trafficking and exocytosis. The encoded protein participates in triggering neurotransmitter release at the synapse in response to calcium binding. Mutations in this gene are associated with Baker-Gordon syndrome. [provided by RefSeq, Jan 2023]

ENSG00000257894 (HGNC:58105):

ACMG classification

Verdict is Likely_pathogenic. Variant got 9 ACMG points.

• PM1: In a region_of_interest Phospholipid binding (size 246) in uniprot entity SYT1_HUMAN there are 4 pathogenic changes around while only 0 benign (100%) in NM_005639.3
• PM2: Very rare variant in population databases, with high coverage
• PP2: Missense variant in the SYT1 gene, where missense mutations are typically associated with disease (based on misZ statistic). The gene has 12 curated pathogenic missense variants (we use a threshold of 10). The gene has 2 curated benign missense variants. Gene score misZ: 2.8351 (below the threshold of 3.09). Trascript score misZ: 4.0021 (above the threshold of 3.09). GenCC associations: The gene is linked to intellectual disability, autosomal dominant 40, infantile hypotonia-oculomotor anomalies-hyperkinetic movements-developmental delay syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.887
• PP5: Variant 12-79448945-G-A is Pathogenic according to our data. Variant chr12-79448945-G-A is described in ClinVar as [Likely_pathogenic]. Clinvar id is 521149.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SYT1	NM_005639.3	c.1090G>A	p.Asp364Asn	missense_variant	Exon 11 of 11	ENST00000261205.9	NP_005630.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SYT1	ENST00000261205.9	c.1090G>A	p.Asp364Asn	missense_variant	Exon 11 of 11	1	NM_005639.3	ENSP00000261205.4

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Inborn genetic diseases Pathogenic:1

Jul 02, 2018

Ambry Genetics

Significance: Likely pathogenic

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	Pathogenic	1.0
BayesDel_addAF	Uncertain	0.098	D
BayesDel_noAF	Benign	-0.10
CADD	Pathogenic	29
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.89	D;D;.;D
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	1.0
FATHMM_MKL	Uncertain	0.97	D
LIST_S2	Pathogenic	1.0	.;.;D;D
M_CAP	Benign	0.056	D
MetaRNN	Pathogenic	0.89	D;D;D;D
MetaSVM	Uncertain	0.49	D
MutationAssessor	Uncertain	2.3	M;M;.;M
PrimateAI	Pathogenic	0.89	D
PROVEAN	Uncertain	-4.3	D;D;D;D
REVEL	Uncertain	0.55
Sift	Pathogenic	0.0	D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D
Polyphen		1.0	D;D;.;D
Vest4		0.83
MutPred		0.79		Gain of methylation at K367 (P = 0.0955);Gain of methylation at K367 (P = 0.0955);.;Gain of methylation at K367 (P = 0.0955);
MVP		0.79
MPC		2.6
ClinPred		1.0	D
GERP RS		6.2
Varity_R		0.93
gMVP		0.88

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.030		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: rs1555226395; hg19: chr12-79842725;