Genetic Variant SMO:p.Val270Leu (chr7-129205670-G-C) – ACMG Classification: Uncertain_significance (2 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 2 ACMG points: 2P and 0B. PM2

The NM_005631.5(SMO):c.808G>C(p.Val270Leu) variant causes a missense change. The variant allele was found at a frequency of 0.000000684 in 1,461,618 control chromosomes in the GnomAD database, with no homozygous occurrence. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. V270I) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 6.8e-7 ( 0 hom. )

Consequence

SMO
NM_005631.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 4.68

Publications

0 publications found

Variant links:

Genes affected

SMO (HGNC:11119): (smoothened, frizzled class receptor) The protein encoded by this gene is a G protein-coupled receptor that interacts with the patched protein, a receptor for hedgehog proteins. The encoded protein tranduces signals to other proteins after activation by a hedgehog protein/patched protein complex. [provided by RefSeq, Jul 2010]

SMO Gene-Disease associations (from GenCC):

Curry-Jones syndrome
Inheritance: AD Classification: DEFINITIVE, STRONG Submitted by: PanelApp Australia, G2P
congenital hypothalamic hamartoma syndrome
Inheritance: AR Classification: STRONG, MODERATE Submitted by: G2P, Ambry Genetics, ClinGen
Hirschsprung disease
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
medulloblastoma
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

SMO links:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 2 ACMG points.

PM2

Very rare variant in population databases, with high coverage;

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005631.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMO	NM_005631.5	MANE Select	c.808G>C	p.Val270Leu	missense	Exon 4 of 12	NP_005622.1

Ensembl Transcripts

Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein
SMO	ENST00000249373.8	TSL:1 MANE Select	c.808G>C	p.Val270Leu	missense	Exon 4 of 12	ENSP00000249373.3
SMO	ENST00000655644.1		n.*672G>C		non_coding_transcript_exon	Exon 5 of 12	ENSP00000499377.1
SMO	ENST00000655644.1		n.*672G>C		3_prime_UTR	Exon 5 of 12	ENSP00000499377.1

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

6.84e-7

AC:

AN:

1461618

Hom.:

Cov.:

AF XY:

0.00000138

AC XY:

AN XY:

727118

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

33480

American (AMR)

AF:

0.00

AC:

AN:

44724

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

26136

East Asian (EAS)

AF:

0.00

AC:

AN:

39700

South Asian (SAS)

AF:

0.00

AC:

AN:

86256

European-Finnish (FIN)

AF:

0.00

AC:

AN:

53200

Middle Eastern (MID)

AF:

0.00

AC:

AN:

5768

European-Non Finnish (NFE)

AF:

8.99e-7

AC:

AN:

1111962

Other (OTH)

AF:

0.00

AC:

AN:

60392

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.525

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

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Pathogenic

0.64

BayesDel_addAF

Uncertain

0.035

BayesDel_noAF

Benign

-0.19

CADD

Uncertain

(source)

DANN

Benign

0.78

DEOGEN2

Benign

0.40

Eigen

Benign

-0.14

Eigen_PC

Benign

0.097

FATHMM_MKL

Uncertain

0.95

LIST_S2

Uncertain

0.91

M_CAP

Benign

0.061

MetaRNN

Uncertain

0.56

MetaSVM

Benign

-0.78

MutationAssessor

Benign

-0.50

PhyloP100

4.7

PrimateAI

Pathogenic

0.81

PROVEAN

Benign

-1.1

REVEL

Benign

0.27

Sift

Benign

0.19

Sift4G

Benign

0.11

Polyphen

0.26

Vest4

0.65

MutPred

0.54

Loss of catalytic residue at V270 (P = 0.02)

MVP

0.78

MPC

0.65

ClinPred

0.80

GERP RS

5.6

Varity_R

0.36

gMVP

0.64

Mutation Taster

=74/26

polymorphism

(source)

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.050

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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over