Genetic Variant SMAD6:p.Gly112Gly (chr15-66703594-C-T) – ACMG Classification: Likely_benign (-4 pts)

Variant summary

Our verdict is Likely benign. The variant received -4 ACMG points: 0P and 4B. BP4_Strong

The NM_005585.5(SMAD6):c.336C>T(p.Gly112Gly) variant causes a synonymous change. The variant allele was found at a frequency of 0.00000836 in 1,076,766 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. No clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar. Synonymous variant affecting the same amino acid position (i.e. G112G) has been classified as Likely benign.

Frequency

Genomes: not found (cov: 33)

Exomes 𝑓: 0.0000084 ( 0 hom. )

Consequence

SMAD6
NM_005585.5 synonymous

Scores

Clinical Significance

Not reported in ClinVar

Conservation

PhyloP100: 4.11

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: Likely_benign. The variant received -4 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.6).

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein
SMAD6	NM_005585.5 link	c.336C>T	p.Gly112Gly	synonymous_variant	Exon 1 of 4	ENST00000288840.10	NP_005576.3
SMAD6	NR_027654.2 link	n.1359C>T		non_coding_transcript_exon_variant	Exon 1 of 5
SMAD6	XR_931827.3 link	n.1359C>T		non_coding_transcript_exon_variant	Exon 1 of 4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein
SMAD6	ENST00000288840.10 link	c.336C>T	p.Gly112Gly	synonymous_variant	Exon 1 of 4	1	NM_005585.5	ENSP00000288840.5
SMAD6	ENST00000557916.5 link	n.336C>T		non_coding_transcript_exon_variant	Exon 1 of 5	1		ENSP00000452955.1
SMAD6	ENST00000612349.1 link	n.518C>T		non_coding_transcript_exon_variant	Exon 1 of 1	6

Frequencies

GnomAD3 genomes

Cov.:

GnomAD4 exome

AF:

0.00000836

AC:

AN:

1076766

Hom.:

Cov.:

AF XY:

0.00000783

AC XY:

AN XY:

510626

show subpopulations

African (AFR)

AF:

0.00

AC:

AN:

22276

American (AMR)

AF:

0.00

AC:

AN:

8118

Ashkenazi Jewish (ASJ)

AF:

0.00

AC:

AN:

13274

East Asian (EAS)

AF:

0.00

AC:

AN:

25150

South Asian (SAS)

AF:

0.00

AC:

AN:

19764

European-Finnish (FIN)

AF:

0.00

AC:

AN:

28492

Middle Eastern (MID)

AF:

0.00

AC:

AN:

2834

European-Non Finnish (NFE)

AF:

0.00000984

AC:

AN:

914468

Other (OTH)

AF:

0.00

AC:

AN:

42390

Allele Balance Distribution

Red line indicates average allele balance

Average allele balance: 0.514

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.:

Alfa

AF:

0.00

Hom.:

Asia WGS

AF:

0.000624

AC:

AN:

3218

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.60

CADD

Benign

(source)

DANN

Benign

0.93

PhyloP100

4.1

RBP_binding_hub_radar

0.0

RBP_regulation_power_radar

1.9

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

ClinVar

Computational scores

Splicing

Publications

Other links and lift over