15-66703520-G-T

Variant names:

Variant summary

Our verdict is Likely benign. The variant received -1 ACMG points: 0P and 1B. BP4

The NM_005585.5(SMAD6):c.262G>T(p.Gly88Cys) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000999 in 1,221,260 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. 13/22 in silico tools predict a benign outcome for this variant. 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. G88A) has been classified as Uncertain significance.

Frequency

Genomes: 𝑓 0.0000066 ( 0 hom., cov: 33)

Exomes 𝑓: 0.00011 ( 0 hom. )

Consequence

SMAD6
NM_005585.5 missense

Scores

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts U:2

Conservation

PhyloP100: 0.158

Publications

1 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:

Genome browser will be placed here

ACMG classification

Classification was made for transcript

Our verdict: Likely_benign. The variant received -1 ACMG points.

BP4

Computational evidence support a benign effect (MetaRNN=0.36225766).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMAD6	NM_005585.5 link	c.262G>T	p.Gly88Cys	missense_variant	Exon 1 of 4	ENST00000288840.10	NP_005576.3	O43541-1
SMAD6	NR_027654.2 link	n.1285G>T		non_coding_transcript_exon_variant	Exon 1 of 5
SMAD6	XR_931827.3 link	n.1285G>T		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.262G>T	p.Gly88Cys	missense_variant	Exon 1 of 4	1	NM_005585.5	ENSP00000288840.5	O43541-1
SMAD6	ENST00000557916.5 link	n.262G>T		non_coding_transcript_exon_variant	Exon 1 of 5	1		ENSP00000452955.1	O43541-4
SMAD6	ENST00000612349.1 link	n.444G>T		non_coding_transcript_exon_variant	Exon 1 of 1	6

Frequencies

GnomAD3 genomes

AF:

0.00000661

AC:

AN:

151236

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

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:

0.0000148

Gnomad OTH

AF:

0.00

GnomAD4 exome

AF:

0.000113

AC:

121

AN:

1070024

Hom.:

Cov.:

AF XY:

0.000109

AC XY:

AN XY:

506322

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

22096

American (AMR)

AF:

0.00

AC:

AN:

7740

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

13304

East Asian (EAS)

AF:

0.00

AC:

AN:

24800

South Asian (SAS)

AF:

0.00

AC:

AN:

19518

European-Finnish (FIN)

AF:

0.00

AC:

AN:

26350

Middle Eastern (MID)

AF:

0.00

AC:

AN:

2804

European-Non Finnish (NFE)

AF:

0.000132

AC:

120

AN:

911154

Other (OTH)

AF:

0.0000237

AC:

AN:

42258

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:

0.00000661

AC:

AN:

151236

Hom.:

Cov.:

AF XY:

0.00

AC XY:

AN XY:

73860

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

41318

American (AMR)

AF:

0.00

AC:

AN:

15194

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

3464

East Asian (EAS)

AF:

0.00

AC:

AN:

5128

South Asian (SAS)

AF:

0.00

AC:

AN:

4834

European-Finnish (FIN)

AF:

0.00

AC:

AN:

10286

Middle Eastern (MID)

AF:

0.00

AC:

AN:

312

European-Non Finnish (NFE)

AF:

0.0000148

AC:

AN:

67712

Other (OTH)

AF:

0.00

AC:

AN:

2078

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

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:

0.00

Hom.:

Bravo

AF:

0.0000264

ClinVar

Significance: Uncertain significance

Submissions summary: Uncertain:2

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Aortic valve disease 2

Uncertain:1

Oct 30, 2024

Labcorp Genetics (formerly Invitae), Labcorp

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

This sequence change replaces glycine, which is neutral and non-polar, with cysteine, which is neutral and slightly polar, at codon 88 of the SMAD6 protein (p.Gly88Cys). This variant is not present in population databases (gnomAD no frequency). This variant has not been reported in the literature in individuals affected with SMAD6-related conditions. ClinVar contains an entry for this variant (Variation ID: 581943). An algorithm developed to predict the effect of missense changes on protein structure and function (PolyPhen-2) suggests that this variant is likely to be disruptive. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance. -

Craniosynostosis 7

Uncertain:1

Feb 02, 2022

Victorian Clinical Genetics Services, Murdoch Childrens Research Institute

Significance:Uncertain significance

Review Status:criteria provided, single submitter

Collection Method:clinical testing

Based on the classification scheme VCGS_Germline_v1.3.4, this variant is classified as VUS-3C. Following criteria are met: 0102 - Loss of function is a known mechanism of disease in this gene and is associated with aortic valve disease 2 (MIM#614823) and craniosynostosis 7 (MIM#617439). (I) 0107 - This gene is associated with autosomal dominant disease. (I) 0112 - The condition associated with this gene has incomplete penetrance. Variants associated with craniosynostosis have been reported to be inherited from clinically unaffected parents (PMIDs: 32499606, 27606499). (I) 0200 - Variant is predicted to result in a missense amino acid change from glycine to cysteine. (I) 0251 - This variant is heterozygous. (I) 0302 - Variant is present in gnomAD (v3) <0.001 for a dominant condition (1 heterozygote, 0 homozygotes). (SP) 0309 - An alternative amino acid change at the same position has been observed in gnomAD (v3) (1 heterozygote, 0 homozygotes). (I) 0503 - Missense variant consistently predicted to be tolerated by multiple in silico tools or not conserved in placental mammals with a minor amino acid change. (SB) 0604 - Variant is not located in an established domain, motif, hotspot or informative constraint region. (I) 0705 - No comparable missense variants have previous evidence for pathogenicity. (I) 0809 - Previous evidence of pathogenicity for this variant is inconclusive. It has been reported as uncertain pathogenicity in an individual with craniosynostosis (PMID: 32499606), and reported as a VUS in ClinVar. (I) 0905 - No published segregation evidence has been identified for this variant. (I) 1004 - This variant has moderate functional evidence supporting normal protein function. Functional studies using transfected cells showed normal inhibitory activity and normal protein stability (PMID: 32499606). (SB) 1205 - This variant has been shown to be maternally inherited (by trio analysis). (I) Legend: (SP) - Supporting pathogenic, (I) - Information, (SB) - Supporting benign -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

AlphaMissense

Benign

0.14

BayesDel_addAF

Benign

-0.043

BayesDel_noAF

Benign

-0.30

CADD

Uncertain

(source)

DANN

Uncertain

1.0

DEOGEN2

Benign

0.30

Eigen

Benign

-0.28

Eigen_PC

Benign

-0.31

FATHMM_MKL

Benign

0.66

LIST_S2

Benign

0.49

M_CAP

Pathogenic

0.92

MetaRNN

Benign

0.36

MetaSVM

Benign

-0.91

MutationAssessor

Benign

1.1

PhyloP100

0.16

PrimateAI

Pathogenic

0.92

PROVEAN

Benign

-0.63

REVEL

Benign

0.16

Sift

Uncertain

0.019

Sift4G

Uncertain

0.019

Polyphen

0.95

Vest4

0.25

MutPred

0.33

Loss of methylation at R91 (P = 0.0691);

MVP

0.67

MPC

2.2

ClinPred

0.64

GERP RS

2.0

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.8

Varity_R

0.14

gMVP

0.38

Mutation Taster

=78/22

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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Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

Publications

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

Age Distribution

Age Distribution

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

Other links and lift over