Variant 22-31083236-C-T details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Likely benign. Variant got -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_134269.3(SMTN):c.-23C>T variant causes a 5 prime UTR premature start codon gain change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000357 in 1,597,336 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 0.000046 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000035 ( 0 hom. )

Consequence

SMTN
NM_134269.3 5_prime_UTR_premature_start_codon_gain

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: -1.53

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:

ENSG00000273387 (HGNC:):

ENSG00000273387 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Likely_benign. Variant got -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.024610072).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMTN	NM_134269.3 link	c.-23C>T		5_prime_UTR_premature_start_codon_gain_variant	Exon 2 of 21	ENST00000333137.12	NP_599031.1	P53814-5
SMTN	NM_134269.3 link	c.-23C>T		5_prime_UTR_variant	Exon 2 of 21	ENST00000333137.12	NP_599031.1	P53814-5

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMTN	ENST00000333137 link	c.-23C>T		5_prime_UTR_premature_start_codon_gain_variant	Exon 2 of 21	1	NM_134269.3	ENSP00000329532.7		P53814-5
SMTN	ENST00000333137 link	c.-23C>T		5_prime_UTR_variant	Exon 2 of 21	1	NM_134269.3	ENSP00000329532.7		P53814-5

Frequencies

GnomAD3 genomes

AF:

0.0000460

AC:

AN:

152200

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.0000654

Gnomad ASJ

AF:

0.00115

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00

Gnomad NFE

AF:

0.0000147

Gnomad OTH

AF:

0.000478

GnomAD3 exomes

AF:

0.0000404

AC:

AN:

222818

Hom.:

AF XY:

0.0000334

AC XY:

AN XY:

119718

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.00

Gnomad ASJ exome

AF:

0.000742

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.00000985

Gnomad OTH exome

AF:

0.000182

GnomAD4 exome

AF:

0.0000346

AC:

AN:

1445136

Hom.:

Cov.:

AF XY:

0.0000446

AC XY:

AN XY:

717122

show subpopulations

Gnomad4 AFR exome

AF:

0.0000299

Gnomad4 AMR exome

AF:

0.000148

Gnomad4 ASJ exome

AF:

0.00113

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000121

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.00000542

Gnomad4 OTH exome

AF:

0.000117

GnomAD4 genome

AF:

0.0000460

AC:

AN:

152200

Hom.:

Cov.:

AF XY:

0.0000672

AC XY:

AN XY:

74354

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.0000654

Gnomad4 ASJ

AF:

0.00115

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000147

Gnomad4 OTH

AF:

0.000478

Alfa

AF:

0.0000900

Hom.:

Bravo

AF:

0.000125

ExAC

AF:

0.0000249

AC:

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:1

Revision: criteria provided, single submitter

LINK: link

Submissions by phenotype

not specified

Uncertain:1

Aug 11, 2022

Ambry Genetics

Significance: Uncertain significance

Review Status: criteria provided, single submitter

Collection Method: clinical testing

The c.140C>T (p.P47L) alteration is located in exon 2 (coding exon 2) of the SMTN gene. This alteration results from a C to T substitution at nucleotide position 140, causing the proline (P) at amino acid position 47 to be replaced by a leucine (L). 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

BayesDel_addAF

Benign

-0.32

BayesDel_noAF

Benign

-0.70

CADD

Benign

1.6

DANN

Benign

0.71

Eigen

Benign

-1.6

Eigen_PC

Benign

-1.7

FATHMM_MKL

Benign

0.024

LIST_S2

Benign

0.61

T;T;T;T

MetaRNN

Benign

0.025

T;T;T;T

MetaSVM

Benign

-1.0

PrimateAI

Benign

0.23

PROVEAN

Benign

-1.9

N;N;N;.

REVEL

Benign

0.030

Sift

Uncertain

0.011

D;D;D;.

Sift4G

Pathogenic

0.0

D;T;T;T

Vest4

0.14

MutPred

0.22

Loss of loop (P = 9e-04);Loss of loop (P = 9e-04);Loss of loop (P = 9e-04);Loss of loop (P = 9e-04);

MVP

0.10

ClinPred

0.020

GERP RS

-5.7

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.1

gMVP

0.094

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