Variant 15-66703712-CCGGCGGG-C details in Genebe, Genetics Data Aggregator

Variant summary

Our verdict is Uncertain significance. Variant got 4 ACMG points: 8P and 4B. PVS1BS2

The ENST00000288840.10(SMAD6):c.465_471del(p.Gly156ValfsTer23) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.0000141 in 1,346,942 control chromosomes in the GnomAD database, with no homozygous occurrence. Variant has been reported in ClinVar as Uncertain significance (★★). Synonymous variant affecting the same amino acid position (i.e. P152P) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

Frequency

Genomes: 𝑓 0.000013 ( 0 hom., cov: 32)

Exomes 𝑓: 0.000014 ( 0 hom. )

Consequence

SMAD6
ENST00000288840.10 frameshift

Scores

Not classified

Clinical Significance

Uncertain significance criteria provided, multiple submitters, no conflicts P:1U:3O:1

Conservation

PhyloP100: 1.96

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 links:

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ACMG classification

Classification made for transcript

Verdict is Uncertain_significance. Variant got 4 ACMG points.

PVS1

Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.

BS2

High AC in GnomAdExome4 at 17 AD gene.

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	Protein
SMAD6	NM_005585.5 linkuse as main transcript	c.465_471del	p.Gly156ValfsTer23	frameshift_variant	1/4	ENST00000288840.10	NP_005576.3
SMAD6	NR_027654.2 linkuse as main transcript	n.1488_1494del		non_coding_transcript_exon_variant	1/5
SMAD6	XR_931827.3 linkuse as main transcript	n.1488_1494del		non_coding_transcript_exon_variant	1/4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Protein	Appris	UniProt
SMAD6	ENST00000288840.10 linkuse as main transcript	c.465_471del	p.Gly156ValfsTer23	frameshift_variant	1/4	1	NM_005585.5	ENSP00000288840	P1	O43541-1
SMAD6	ENST00000557916.5 linkuse as main transcript	c.465_471del	p.Gly156ValfsTer23	frameshift_variant, NMD_transcript_variant	1/5	1		ENSP00000452955		O43541-4
SMAD6	ENST00000612349.1 linkuse as main transcript	n.647_653del		non_coding_transcript_exon_variant	1/1

Frequencies

GnomAD3 genomes

AF:

0.0000133

AC:

AN:

150106

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.00

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00

Gnomad ASJ

AF:

0.000290

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:

0.0000142

AC:

AN:

1196836

Hom.:

AF XY:

0.00000683

AC XY:

AN XY:

585938

show subpopulations

Gnomad4 AFR exome

AF:

0.0000400

Gnomad4 AMR exome

AF:

0.00

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000199

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000155

Gnomad4 OTH exome

AF:

0.00

GnomAD4 genome

AF:

0.0000133

AC:

AN:

150106

Hom.:

Cov.:

AF XY:

0.0000273

AC XY:

AN XY:

73216

show subpopulations

Gnomad4 AFR

AF:

0.00

Gnomad4 AMR

AF:

0.00

Gnomad4 ASJ

AF:

0.000290

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.0000148

Gnomad4 OTH

AF:

0.00

Bravo

AF:

0.0000113

ClinVar

Significance: Uncertain significance

Submissions summary: Pathogenic:1Uncertain:3Other:1

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

Craniosynostosis syndrome

Pathogenic:1

Pathogenic, no assertion criteria provided

literature only

Yale Center for Mendelian Genomics, Yale University

Jan 01, 2018

- -

Radioulnar synostosis

Uncertain:1

Uncertain significance, no assertion criteria provided

case-control

The Laboratory of Genetics and Metabolism, Hunan Children’s Hospital

May 14, 2019

PVS1, PM2, PP4, BS4 -

Aortic valve disease 2

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jul 15, 2019

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. The current clinical and genetic evidence is not sufficient to establish whether loss-of-function variants in SMAD6 cause disease. This variant has been observed in an individual affected with sagittal craniosynostosis as well as his unaffected parent. In addition, the affected individual had a de novo variant in another gene related to craniosynostosis, indicating that the SMAD6 variant was not the primary cause of disease (PMID:¬†28808027). This variant has also been observed in an individual with bicuspid aortic valve associated thoracic aortic aneurysm (PMID: 28659821). The frequency data for this variant in the population databases is considered unreliable, as metrics indicate insufficient coverage at this position in the ExAC database. This sequence change creates a premature translational stop signal (p.Gly156Valfs*23) in the SMAD6 gene. It is expected to result in an absent or disrupted protein product. -

not provided

Uncertain:1

Uncertain significance, criteria provided, single submitter

clinical testing

GeneDx

Jun 15, 2022

Reported in a patient with craniosynostosis who also harbored an additional potentially disease-causing variant in the TCF12 gene (Timberlake et al., 2017); Not observed at significant frequency in large population cohorts (gnomAD); Frameshift variant predicted to result in protein truncation or nonsense mediated decay in a gene or region of a gene for which loss of function is not a well-established mechanism of disease.; This variant is associated with the following publications: (PMID: 28659821, 30038786, 31138930, 28808027) -

Radioulnar synostosis, nonsyndromic, susceptibility to

Other:1

risk factor, no assertion criteria provided

literature only

OMIM

Aug 28, 2020

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

Splicing

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