chr12-79296070-T-G

Position:

• chr12-79296070-T-G

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.476T>G​(p.Leu159Arg) variant causes a missense, splice region 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. 3/3 splice prediction tools predict no significant impact on normal splicing. Variant has been reported in ClinVar as Likely pathogenic (★).

• Frequency: Genomes: not found (cov: 32)
• Consequence: SYT1 NM_005639.3 missense, splice_region
• Scores: Splicing: ADA: 0.7995
• Clinical Significance: Likely pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: 8.02

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]

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 gene, where missense usually causes diseases (based on misZ statistic), SYT1. . Gene score misZ 2.8351 (greater than the threshold 3.09). Trascript score misZ 4.0021 (greater than threshold 3.09). GenCC has associacion of gene with intellectual disability, autosomal dominant 40, infantile hypotonia-oculomotor anomalies-hyperkinetic movements-developmental delay syndrome.
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.876
• PP5: Variant 12-79296070-T-G is Pathogenic according to our data. Variant chr12-79296070-T-G is described in ClinVar as [Likely_pathogenic]. Clinvar id is 1064864.Status of the report is criteria_provided_single_submitter, 1 stars.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
SYT1	NM_005639.3	c.476T>G	p.Leu159Arg	missense_variant, splice_region_variant	7/11	ENST00000261205.9	NP_005630.1

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SYT1	ENST00000261205.9	c.476T>G	p.Leu159Arg	missense_variant, splice_region_variant	7/11	1	NM_005639.3	ENSP00000261205	P3

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome Cov.: 30

GnomAD4 genome Cov.: 32

ClinVar

Significance: Likely pathogenic

Submissions summary: Pathogenic:1

Revision: criteria provided, single submitter

Submissions by phenotype

Neurodevelopmental disorder Pathogenic:1

Likely pathogenic, criteria provided, single submitter

clinical testing

Laboratory of Molecular Genetics (Pr. Bezieau's lab), CHU de Nantes

Oct 27, 2020

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Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	1.0
BayesDel_addAF	Pathogenic	0.30	D
BayesDel_noAF	Pathogenic	0.19
CADD	Pathogenic	30
DANN	Uncertain	1.0
DEOGEN2	Pathogenic	0.97	D;D;.;D;D;D
Eigen	Pathogenic	1.0
Eigen_PC	Pathogenic	0.93
FATHMM_MKL	Pathogenic	0.98	D
LIST_S2	Uncertain	0.96	.;.;D;D;D;D
M_CAP	Uncertain	0.085	D
MetaRNN	Pathogenic	0.88	D;D;D;D;D;D
MetaSVM	Uncertain	0.088	D
MutationAssessor	Pathogenic	4.3	H;H;.;H;.;.
MutationTaster	Benign	1.0	D;D;D;D
PrimateAI	Pathogenic	0.88	D
PROVEAN	Pathogenic	-5.6	D;D;D;D;D;D
REVEL	Pathogenic	0.79
Sift	Pathogenic	0.0	D;D;D;D;D;D
Sift4G	Pathogenic	0.0	D;D;D;D;D;D
Polyphen		1.0	D;D;.;D;.;.
Vest4		0.93
MutPred		0.71		Loss of stability (P = 0.0236);Loss of stability (P = 0.0236);.;Loss of stability (P = 0.0236);.;Loss of stability (P = 0.0236);
MVP		0.71
MPC		1.1
ClinPred		1.0	D
GERP RS		5.5
Varity_R		0.97
gMVP		0.97

Splicing

Name	Calibrated prediction	Score	Prediction
dbscSNV1_ADA	Benign	0.80
dbscSNV1_RF	Benign	0.49
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

No publications associated with this variant yet.

Other links and lift over

hg19: chr12-79689850;