Genetic Variant SMAD6:p.Ser7Ala (chr15-66703277-T-G) – ACMG Classification: Uncertain_significance (3 pts)

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 4P and 1B. PM1PM2BP4

The NM_005585.5(SMAD6):c.19T>G(p.Ser7Ala) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000375 in 1,331,952 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 14/22 in silico tools predict a benign outcome for this variant. 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. S7P) has been classified as Uncertain significance.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000038 ( 0 hom. )

Consequence

SMAD6
NM_005585.5 missense

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 1.42

Publications

0 publications found

Variant links:

Genes affected

SMAD6 (HGNC:6772): (SMAD family member 6) The protein encoded by this gene belongs to the SMAD family of proteins, which are related to Drosophila 'mothers against decapentaplegic' (Mad) and C. elegans Sma. SMAD proteins are signal transducers and transcriptional modulators that mediate multiple signaling pathways. This protein functions in the negative regulation of BMP and TGF-beta/activin-signalling. Multiple transcript variants have been found for this gene.[provided by RefSeq, Sep 2014]

SMAD6 Gene-Disease associations (from GenCC):

craniosynostosis 7
Inheritance: AD, Unknown Classification: STRONG, MODERATE, LIMITED Submitted by: G2P, Labcorp Genetics (formerly Invitae), Ambry Genetics, PanelApp Australia
radioulnar synostosis, nonsyndromic, susceptibility to
Inheritance: AD Classification: STRONG Submitted by: Ambry Genetics
aortic valve disease 2
Inheritance: AD, Unknown Classification: MODERATE, LIMITED Submitted by: Ambry Genetics, PanelApp Australia, Labcorp Genetics (formerly Invitae)
familial bicuspid aortic valve
Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet
congenital radioulnar synostosis
Inheritance: AR, Unknown Classification: SUPPORTIVE, LIMITED Submitted by: Ambry Genetics, Orphanet
congenital heart defects, multiple types
Inheritance: AD Classification: LIMITED Submitted by: Ambry Genetics

SMAD6 links:

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ACMG classification

Classification was made for transcript

Our verdict: Uncertain_significance. The variant received 3 ACMG points.

PM1

In a hotspot region, there are 2 aminoacids with missense pathogenic changes in the window of +-8 aminoacids around while only 0 benign, 10 uncertain in NM_005585.5

PM2

Very rare variant in population databases, with high coverage;

BP4

Computational evidence support a benign effect (MetaRNN=0.31650865).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMAD6	NM_005585.5 link	c.19T>G	p.Ser7Ala	missense_variant	Exon 1 of 4	ENST00000288840.10	NP_005576.3	O43541-1
SMAD6	NR_027654.2 link	n.1042T>G		non_coding_transcript_exon_variant	Exon 1 of 5
SMAD6	XR_931827.3 link	n.1042T>G		non_coding_transcript_exon_variant	Exon 1 of 4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	UniProt
SMAD6	ENST00000288840.10 link	c.19T>G	p.Ser7Ala	missense_variant	Exon 1 of 4	1	NM_005585.5	ENSP00000288840.5	O43541-1
SMAD6	ENST00000557916.5 link	n.19T>G		non_coding_transcript_exon_variant	Exon 1 of 5	1		ENSP00000452955.1	O43541-4
SMAD6	ENST00000612349.1 link	n.201T>G		non_coding_transcript_exon_variant	Exon 1 of 1	6

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000375

AC:

AN:

1331952

Hom.:

Cov.:

AF XY:

0.00000152

AC XY:

AN XY:

658024

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

26730

American (AMR)

AF:

0.00

AC:

AN:

26104

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

23124

East Asian (EAS)

AF:

0.00

AC:

AN:

29012

South Asian (SAS)

AF:

0.00

AC:

AN:

72438

European-Finnish (FIN)

AF:

0.00

AC:

AN:

47334

Middle Eastern (MID)

AF:

0.00

AC:

AN:

4194

European-Non Finnish (NFE)

AF:

0.00000477

AC:

AN:

1048650

Other (OTH)

AF:

0.00

AC:

AN:

54366

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.405

Heterozygous variant carriers

0.00

0.20

0.40

0.60

0.80

0.95

Allele balance

GnomAD4 genome

Cov.:

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.16

BayesDel_addAF

Benign

-0.046

BayesDel_noAF

Benign

-0.30

CADD

Benign

(source)

DANN

Uncertain

0.99

DEOGEN2

Uncertain

0.49

Eigen

Benign

-0.20

Eigen_PC

Benign

-0.052

FATHMM_MKL

Benign

0.73

LIST_S2

Benign

0.68

M_CAP

Pathogenic

0.79

MetaRNN

Benign

0.32

MetaSVM

Benign

-0.69

MutationAssessor

Benign

1.8

PhyloP100

1.4

PrimateAI

Pathogenic

0.93

PROVEAN

Benign

-0.70

REVEL

Benign

0.29

Sift

Uncertain

0.017

Sift4G

Benign

0.067

Polyphen

0.012

Vest4

0.30

MutPred

0.24

Loss of phosphorylation at S7 (P = 0.0046);

MVP

0.67

MPC

2.1

ClinPred

0.90

GERP RS

3.9

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.8

Varity_R

0.16

gMVP

0.50

Mutation Taster

=80/20

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

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15-66703277-T-G

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

ClinVar

Computational scores

Splicing

Publications

Other links and lift over