12-79285934-A-G

Position:

chr12-79285934-A-G

Variant summary

Our verdict is Likely benign. Variant got -6 ACMG points: 1P and 7B. PP2BP4_ModerateBS1_SupportingBS2

The NM_005639.3(SYT1):c.314A>G(p.Lys105Arg) variant causes a missense change. The variant allele was found at a frequency of 0.00000682 in 1,612,740 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 Uncertain significance (★).

Frequency

Genomes: 𝑓 0.000026 ( 0 hom., cov: 32)

Exomes 𝑓: 0.0000048 ( 0 hom. )

Consequence

SYT1
NM_005639.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 6.03

Variant links:

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]

SYT1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -6 ACMG points.

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.

BP4

Computational evidence support a benign effect (MetaRNN=0.25535297).

BS1

Variant frequency is greater than expected in population amr. gnomad4 allele frequency = 0.0000263 (4/152232) while in subpopulation AMR AF= 0.000196 (3/15286). AF 95% confidence interval is 0.0000528. There are 0 homozygotes in gnomad4. There are 2 alleles in male gnomad4 subpopulation. Median coverage is 32. This position pass quality control queck. Existence of Clinvar submissions makes me limit the strength of this signal to Supporting

BS2

High AC in GnomAdExome4 at 7 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SYT1	NM_005639.3 linkuse as main transcript	c.314A>G	p.Lys105Arg	missense_variant	5/11	ENST00000261205.9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SYT1	ENST00000261205.9 linkuse as main transcript	c.314A>G	p.Lys105Arg	missense_variant	5/11	1	NM_005639.3	P3

Frequencies

GnomAD3 genomes

AF:

0.0000263

AC:

AN:

152232

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000196

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

GnomAD3 exomes

AF:

0.00000400

AC:

AN:

249862

Hom.:

AF XY:

0.00000741

AC XY:

AN XY:

135004

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000882

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.00000479

AC:

AN:

1460508

Hom.:

Cov.:

AF XY:

0.00000413

AC XY:

AN XY:

726540

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.00

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000630

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000263

AC:

AN:

152232

Hom.:

Cov.:

AF XY:

0.0000269

AC XY:

AN XY:

74374

show subpopulations

Gnomad4 AFR

AF:

0.0000241

Gnomad4 AMR

AF:

0.000196

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.00

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.0000564

Hom.:

Bravo

AF:

0.0000264

TwinsUK

AF:

0.00

AC:

ALSPAC

AF:

0.000259

AC:

ExAC

AF:

0.0000165

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

Inborn genetic diseases

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Feb 12, 2024

The c.314A>G (p.K105R) alteration is located in exon 6 (coding exon 2) of the SYT1 gene. This alteration results from a A to G substitution at nucleotide position 314, causing the lysine (K) at amino acid position 105 to be replaced by an arginine (R). Based on insufficient or conflicting evidence, the clinical significance of this alteration remains unclear. -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.13

BayesDel_addAF

Benign

-0.087

BayesDel_noAF

Benign

-0.30

CADD

Uncertain

DANN

Uncertain

1.0

DEOGEN2

Uncertain

0.64

D;D;.;D;T;T

Eigen

Benign

0.16

Eigen_PC

Uncertain

0.32

FATHMM_MKL

Pathogenic

0.98

LIST_S2

Uncertain

0.88

.;.;D;D;D;D

M_CAP

Benign

0.012

MetaRNN

Benign

0.26

T;T;T;T;T;T

MetaSVM

Benign

-0.99

MutationAssessor

Uncertain

2.9

M;M;.;M;.;.

MutationTaster

Benign

1.0

D;D;D;D

PrimateAI

Pathogenic

0.82

PROVEAN

Benign

-1.8

N;N;N;N;N;N

REVEL

Benign

0.096

Sift

Benign

0.047

D;D;D;D;T;T

Sift4G

Benign

0.062

T;T;T;T;T;D

Polyphen

0.074

B;B;.;B;.;.

Vest4

0.45

MutPred

0.32

Loss of ubiquitination at K105 (P = 0.0283);Loss of ubiquitination at K105 (P = 0.0283);Loss of ubiquitination at K105 (P = 0.0283);Loss of ubiquitination at K105 (P = 0.0283);Loss of ubiquitination at K105 (P = 0.0283);Loss of ubiquitination at K105 (P = 0.0283);

MVP

0.28

MPC

0.20

ClinPred

0.62

GERP RS

5.6

Varity_R

0.31

gMVP

0.29

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

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over