Variant 22-31088016-C-T details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Uncertain significance. Variant got 2 ACMG points: 2P and 0B. PM2

The NM_134269.3(SMTN):c.103C>T(p.Arg35Trp) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000893 in 1,611,664 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★). Another variant affecting the same amino acid position, but resulting in a different missense (i.e. R35Q) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.000092 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000089 ( 0 hom. )

Consequence

SMTN
NM_134269.3 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 2.29

Variant links:

Genes affected

SMTN (HGNC:11126): (smoothelin) This gene encodes a structural protein that is found exclusively in contractile smooth muscle cells. It associates with stress fibers and constitutes part of the cytoskeleton. This gene is localized to chromosome 22q12.3, distal to the TUPLE1 locus and outside the DiGeorge syndrome deletion. Alternative splicing of this gene results in multiple transcript variants encoding distinct isoforms. [provided by RefSeq, May 2011]

SMTN links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
SMTN	NM_134269.3 linkuse as main transcript	c.103C>T	p.Arg35Trp	missense_variant	3/21	ENST00000333137.12

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
SMTN	ENST00000333137.12 linkuse as main transcript	c.103C>T	p.Arg35Trp	missense_variant	3/21	1	NM_134269.3	P1	P53814-5

Frequencies

GnomAD3 genomes

AF:

0.0000920

AC:

AN:

152236

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.000131

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.000193

Gnomad SAS

AF:

0.000620

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.000118

Gnomad OTH

AF:

0.00

GnomAD3 exomes

AF:

0.000105

AC:

AN:

248182

Hom.:

AF XY:

0.000104

AC XY:

AN XY:

134818

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000872

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.000196

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000134

Gnomad OTH exome

AF:

0.000331

GnomAD4 exome

AF:

0.0000891

AC:

130

AN:

1459310

Hom.:

Cov.:

AF XY:

0.000101

AC XY:

AN XY:

725592

show subpopulations

Gnomad4 AFR exome

AF:

0.00

Gnomad4 AMR exome

AF:

0.0000448

Gnomad4 ASJ exome

AF:

0.0000383

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.000232

Gnomad4 FIN exome

AF:

0.0000759

Gnomad4 NFE exome

AF:

0.0000846

Gnomad4 OTH exome

AF:

0.000149

GnomAD4 genome

AF:

0.0000919

AC:

AN:

152354

Hom.:

Cov.:

AF XY:

0.000121

AC XY:

AN XY:

74500

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.000131

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.000193

Gnomad4 SAS

AF:

0.000621

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000118

Gnomad4 OTH

AF:

0.00

Alfa

AF:

0.000205

Hom.:

Bravo

AF:

0.0000718

ExAC

AF:

0.0000742

AC:

EpiCase

AF:

0.0000545

EpiControl

AF:

0.00

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 16, 2022

The c.265C>T (p.R89W) alteration is located in exon 3 (coding exon 3) of the SMTN gene. This alteration results from a C to T substitution at nucleotide position 265, causing the arginine (R) at amino acid position 89 to be replaced by a tryptophan (W). 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

Pathogenic

0.70

BayesDel_addAF

Pathogenic

0.21

BayesDel_noAF

Pathogenic

0.32

Cadd

Pathogenic

Dann

Pathogenic

1.0

Eigen

Uncertain

0.50

Eigen_PC

Uncertain

0.50

FATHMM_MKL

Uncertain

0.94

LIST_S2

Uncertain

0.95

D;D;D;D;D;D;D;D;D;D;D

M_CAP

Uncertain

0.15

MetaRNN

Uncertain

0.51

D;D;D;D;D;D;D;D;D;D;D

MetaSVM

Uncertain

0.61

MutationTaster

Benign

1.0

D;D;D

PrimateAI

Pathogenic

0.91

PROVEAN

Pathogenic

-7.5

D;D;D;D;N;N;N;.;.;.;D

REVEL

Uncertain

0.61

Sift

Pathogenic

0.0

D;D;D;D;D;D;D;.;.;.;D

Sift4G

Pathogenic

0.0

D;D;D;D;D;D;D;D;D;D;D

Polyphen

1.0

.;.;.;.;.;D;D;.;.;.;.

Vest4

0.80, 0.81, 0.87, 0.85, 0.91

MutPred

0.41

.;Loss of MoRF binding (P = 0.0815);.;.;Loss of MoRF binding (P = 0.0815);Loss of MoRF binding (P = 0.0815);Loss of MoRF binding (P = 0.0815);Loss of MoRF binding (P = 0.0815);.;.;.;

MVP

0.89

MPC

0.68

ClinPred

0.38

GERP RS

4.8

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.7

Varity_R

0.37

gMVP

0.81

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