chr15-66703278-C-G

Variant names:

• chr15-66703278-C-G
• rs1418570348
• NM_005585.5:c.20C>G

Variant summary

Our verdict is Uncertain significance. The variant received 3 ACMG points: 3P and 0B. PM1 PP3

The NM_005585.5(SMAD6):​c.20C>G​(p.Ser7Trp) variant causes a missense change. The variant allele was found at a frequency of 0.00000471 in 1,485,308 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a pathogenic 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: 𝑓 0.0000066 (0 hom., cov: 33)
  • Exomes 𝑓: 0.0000045 (0 hom.)
• Consequence: SMAD6 NM_005585.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 3.74
• Publications: 0 publications found

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

ACMG classification

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
• PP3: MetaRNN computational evidence supports a deleterious effect, 0.819

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	MANE	Protein	UniProt
SMAD6	NM_005585.5	c.20C>G	p.Ser7Trp	missense_variant	Exon 1 of 4	ENST00000288840.10	NP_005576.3
SMAD6	NR_027654.2	n.1043C>G		non_coding_transcript_exon_variant	Exon 1 of 5
SMAD6	XR_931827.3	n.1043C>G		non_coding_transcript_exon_variant	Exon 1 of 4

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	Exon rank	TSL	MANE	Protein	Appris	UniProt
SMAD6	ENST00000288840.10	c.20C>G	p.Ser7Trp	missense_variant	Exon 1 of 4	1	NM_005585.5	ENSP00000288840.5
SMAD6	ENST00000557916.5	n.20C>G		non_coding_transcript_exon_variant	Exon 1 of 5	1		ENSP00000452955.1
SMAD6	ENST00000612349.1	n.202C>G		non_coding_transcript_exon_variant	Exon 1 of 1	6

Frequencies

GnomAD3 genomes AF: 0.00000658 AC: 1 AN: 152056 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000241

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: 0.00

Gnomad OTH AF: 0.00

GnomAD4 exome AF: 0.00000450 AC: 6 AN: 1333252 Hom.: 0 Cov.: 31 AF XY: 0.00000152 AC XY: 1 AN XY: 658624

African (AFR) AF: 0.00 AC: 0 AN: 26760

American (AMR) AF: 0.0000382 AC: 1 AN: 26212

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 23162

East Asian (EAS) AF: 0.00 AC: 0 AN: 29020

South Asian (SAS) AF: 0.00 AC: 0 AN: 72560

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 47362

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 4224

European-Non Finnish (NFE) AF: 0.00000476 AC: 5 AN: 1049500

Other (OTH) AF: 0.00 AC: 0 AN: 54452

GnomAD4 genome AF: 0.00000658 AC: 1 AN: 152056 Hom.: 0 Cov.: 33 AF XY: 0.00 AC XY: 0 AN XY: 74308

African (AFR) AF: 0.0000241 AC: 1 AN: 41422

American (AMR) AF: 0.00 AC: 0 AN: 15282

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3472

East Asian (EAS) AF: 0.00 AC: 0 AN: 5180

South Asian (SAS) AF: 0.00 AC: 0 AN: 4834

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10582

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 314

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67972

Other (OTH) AF: 0.00 AC: 0 AN: 2088

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.00000378

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.3

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Pathogenic	0.89
BayesDel_addAF	Uncertain	0.10	D
BayesDel_noAF	Benign	-0.090
CADD	Pathogenic	32
DANN	Uncertain	0.99
DEOGEN2	Uncertain	0.75	D
Eigen	Uncertain	0.45
Eigen_PC	Uncertain	0.43
FATHMM_MKL	Uncertain	0.83	D
LIST_S2	Uncertain	0.92	D
M_CAP	Pathogenic	0.90	D
MetaRNN	Pathogenic	0.82	D
MetaSVM	Uncertain	0.086	D
MutationAssessor	Benign	1.8	L
PhyloP100		3.7
PrimateAI	Pathogenic	0.94	D
PROVEAN	Benign	-2.3	N
REVEL	Uncertain	0.48
Sift	Uncertain	0.0010	D
Sift4G	Pathogenic	0.0	D
Polyphen		1.0	D
Vest4		0.55
MutPred		0.30		Loss of phosphorylation at S7 (P = 0.0046);
MVP		0.84
MPC		2.7
ClinPred		0.93	D
GERP RS		3.9
Varity_R		0.29
gMVP		0.72
Mutation Taster		=61/39	polymorphism

Splicing

Name	Calibrated prediction	Score	Prediction
SpliceAI score (max)		0.020		Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Other links and lift over

dbSNP: rs1418570348; hg19: chr15-66995616;