Variant 4-4425196-A-C details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Likely benign. Variant got -4 ACMG points: 0P and 4B. BP4_Strong

The NM_016930.4(STX18):c.729T>G(p.Ile243Met) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000718 in 1,614,126 control chromosomes in the GnomAD database, including 2 homozygotes. In-silico tool predicts a benign outcome for this variant. 16/21 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00038 ( 1 hom., cov: 33)

Exomes 𝑓: 0.00075 ( 1 hom. )

Consequence

STX18
NM_016930.4 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -0.825

Variant links:

Genes affected

STX18 (HGNC:15942): (syntaxin 18) This gene encodes a member of the syntaxin family of soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs) which is part of a membrane tethering complex that includes other SNAREs and several peripheral membrane proteins, and is involved in vesicular transport between the endoplasmic reticulum (ER) and the Golgi complex. The encoded protein is important for the organization of the smooth, rough, and exit site ER subdomains. A pseudogene of this gene has been identified. Alternative splicing results in multiple transcript variants. [provided by RefSeq, Oct 2016]

STX18 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -4 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.018052697).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein	UniProt
STX18	NM_016930.4 link	c.729T>G	p.Ile243Met	missense_variant	8/11	ENST00000306200.7	NP_058626.1	Q9P2W9

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
STX18	ENST00000306200.7 link	c.729T>G	p.Ile243Met	missense_variant	8/11	1	NM_016930.4	ENSP00000305810.2		Q9P2W9

Frequencies

GnomAD3 genomes

AF:

0.000381

AC:

AN:

152160

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.000241

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000262

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.000207

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000632

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000342

AC:

AN:

251466

Hom.:

AF XY:

0.000324

AC XY:

AN XY:

135908

show subpopulations

Gnomad AFR exome

AF:

0.000369

Gnomad AMR exome

AF:

0.000231

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000261

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000536

Gnomad OTH exome

AF:

0.000489

GnomAD4 exome

AF:

0.000753

AC:

1101

AN:

1461848

Hom.:

Cov.:

AF XY:

0.000707

AC XY:

514

AN XY:

727226

show subpopulations

Gnomad4 AFR exome

AF:

0.000119

Gnomad4 AMR exome

AF:

0.000179

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000174

Gnomad4 FIN exome

AF:

0.0000187

Gnomad4 NFE exome

AF:

0.000933

Gnomad4 OTH exome

AF:

0.000546

GnomAD4 genome

AF:

0.000381

AC:

AN:

152278

Hom.:

Cov.:

AF XY:

0.000295

AC XY:

AN XY:

74480

show subpopulations

Gnomad4 AFR

AF:

0.000241

Gnomad4 AMR

AF:

0.000261

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.000207

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000632

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000592

Hom.:

Bravo

AF:

0.000570

TwinsUK

AF:

0.000809

AC:

ALSPAC

AF:

0.000259

AC:

ESP6500AA

AF:

0.000227

AC:

ESP6500EA

AF:

0.000581

AC:

ExAC

AF:

0.000313

AC:

EpiCase

AF:

0.000654

EpiControl

AF:

0.000593

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Ambry Genetics

Aug 10, 2021

The c.729T>G (p.I243M) alteration is located in exon 8 (coding exon 8) of the STX18 gene. This alteration results from a T to G substitution at nucleotide position 729, causing the isoleucine (I) at amino acid position 243 to be replaced by a methionine (M). 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

0.10

BayesDel_addAF

Benign

-0.46

BayesDel_noAF

Benign

-0.53

CADD

Benign

1.5

DANN

Benign

0.94

DEOGEN2

Benign

0.013

T;T;T

Eigen

Benign

-1.0

Eigen_PC

Benign

-0.98

FATHMM_MKL

Benign

0.19

LIST_S2

Uncertain

0.93

D;D;D

M_CAP

Benign

0.0090

MetaRNN

Benign

0.018

T;T;T

MetaSVM

Benign

-1.1

MutationAssessor

Benign

1.9

.;L;.

PrimateAI

Benign

0.37

PROVEAN

Benign

-0.63

N;N;N

REVEL

Benign

0.049

Sift

Benign

0.15

T;T;D

Sift4G

Benign

0.083

T;D;.

Polyphen

0.0090

.;B;.

Vest4

0.37

MVP

0.22

MPC

0.24

ClinPred

0.080

GERP RS

-2.1

Varity_R

0.10

gMVP

0.24

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.080

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