Genetic Variant SMTN:c.-80-252G>A (chr22-31082927-G-A) – ACMG Classification: Likely_benign (-2 pts)

Variant summary

Our verdict is Likely benign. The variant received -2 ACMG points: 2P and 4B. PM2BP4_Strong

The NM_001382642.1(SMTN):c.127G>A(p.Val43Ile) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000436 in 1,534,982 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/18 in silico tools predict a benign outcome for this variant. Variant has been reported in ClinVar as Uncertain significance (★).

Frequency

Genomes: 𝑓 0.00030 ( 0 hom., cov: 33)

Exomes 𝑓: 0.000015 ( 0 hom. )

Consequence

SMTN
NM_001382642.1 missense

Scores

Clinical Significance

Uncertain significance criteria provided, single submitter U:1

Conservation

PhyloP100: 0.219

Publications

0 publications found

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:

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ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.0035636723).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_001382642.1. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SMTN	NM_134269.3	MANE Select	c.-80-252G>A		intron	N/A	NP_599031.1	P53814-5
SMTN	NM_001382642.1		c.127G>A	p.Val43Ile	missense	Exon 3 of 23	NP_001369571.1
SMTN	NM_001207017.1		c.7G>A	p.Val3Ile	missense	Exon 1 of 21	NP_001193946.1	A0A087X1R1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
SMTN	ENST00000333137.12	TSL:1 MANE Select	c.-80-252G>A		intron	N/A	ENSP00000329532.7	P53814-5
SMTN	ENST00000347557.6	TSL:1	c.-80-252G>A		intron	N/A	ENSP00000328635.5	P53814-1
SMTN	ENST00000619644.5	TSL:2	c.7G>A	p.Val3Ile	missense	Exon 1 of 21	ENSP00000484398.1	A0A087X1R1

Frequencies

GnomAD3 genomes

AF:

0.000302

AC:

AN:

152198

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.0482

Gnomad AMR

AF:

0.00

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:

0.0000294

Gnomad OTH

AF:

0.00

GnomAD2 exomes

AF:

0.0000340

AC:

AN:

147210

AF XY:

0.0000252

show subpopulations

Gnomad AFR exome

AF:

0.00

Gnomad AMR exome

AF:

0.0000815

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.0000551

Gnomad OTH exome

AF:

0.00

GnomAD4 exome

AF:

0.0000152

AC:

AN:

1382784

Hom.:

Cov.:

AF XY:

0.0000146

AC XY:

AN XY:

683046

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

31284

American (AMR)

AF:

0.0000841

AC:

AN:

35670

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

25038

East Asian (EAS)

AF:

0.00

AC:

AN:

35666

South Asian (SAS)

AF:

0.00

AC:

AN:

78954

European-Finnish (FIN)

AF:

0.00

AC:

AN:

48160

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5670

European-Non Finnish (NFE)

AF:

0.0000160

AC:

AN:

1064882

Other (OTH)

AF:

0.0000174

AC:

AN:

57460

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.475

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Exome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

GnomAD4 genome

AF:

0.000302

AC:

AN:

152198

Hom.:

Cov.:

AF XY:

0.000282

AC XY:

AN XY:

74352

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41432

American (AMR)

AF:

0.00

AC:

AN:

15284

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3472

East Asian (EAS)

AF:

0.00

AC:

AN:

5204

South Asian (SAS)

AF:

0.00

AC:

AN:

4836

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10624

Middle Eastern (MID)

AF:

0.00

AC:

AN:

316

European-Non Finnish (NFE)

AF:

0.0000294

AC:

AN:

68028

Other (OTH)

AF:

0.00

AC:

AN:

2090

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.499

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

Age Distribution

Genome Het

Variant carriers

<30

30-35

35-40

40-45

45-50

50-55

55-60

60-65

65-70

70-75

75-80

>80

Age

Alfa

AF:

0.0000494

Hom.:

Bravo

AF:

0.000416

ClinVar

ClinVar submissions

Significance:Uncertain significance

Revision:criteria provided, single submitter

View on ClinVar

Pathogenic

VUS

Benign

Condition

not specified (1)

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.12

BayesDel_addAF

Benign

-0.27

BayesDel_noAF

Benign

-0.44

CADD

Benign

2.2

(source)

DANN

Benign

0.67

Eigen

Benign

-1.2

Eigen_PC

Benign

-1.3

FATHMM_MKL

Benign

0.36

LIST_S2

Benign

0.41

MetaRNN

Benign

0.0036

MetaSVM

Benign

-1.0

PhyloP100

0.22

PrimateAI

Benign

0.47

PROVEAN

Benign

-0.19

REVEL

Benign

0.015

Sift

Pathogenic

0.0

Sift4G

Pathogenic

0.0

Vest4

0.047

MVP

0.12

ClinPred

0.15

GERP RS

-0.046

PromoterAI

-0.029

Neutral

(source)

gMVP

0.027

Mutation Taster

=100/0

polymorphism

(source)

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

You must be logged in to view publications. This limit was set because tens of millions (!) of queries from AI bots are generated daily.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Variant Effect in Transcripts

RefSeq Transcripts

Ensembl Transcripts

Frequencies

Age Distribution

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over