15-66703620-G-C

Variant names:

• chr15-66703620-G-C
• rs80232004
• NM_005585.5:c.362G>C

Variant summary

Our verdict is Uncertain significance. The variant received 0 ACMG points: 2P and 2B. PM2 BP4_Moderate

The NM_005585.5(SMAD6):​c.362G>C​(p.Cys121Ser) variant causes a missense change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00000662 in 151,010 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. Another variant affecting the same amino acid position, but resulting in a different missense (i.e. C121Y) has been classified as Likely benign.

• Frequency:
  • Genomes: 𝑓 0.0000066 (0 hom., cov: 33)
  • Exomes 𝑓: 0.0 (0 hom.)
  • Failed GnomAD Quality Control
• Consequence: SMAD6 NM_005585.5 missense
• Clinical Significance: Not reported in ClinVar
• Conservation: PhyloP100: 2.86
• Publications: 4 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 0 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (MetaRNN=0.20248458).

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005585.5. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMAD6	NM_005585.5	MANE Select	c.362G>C	p.Cys121Ser	missense	Exon 1 of 4	NP_005576.3
	SMAD6	NR_027654.2		n.1385G>C		non_coding_transcript_exon	Exon 1 of 5

Ensembl Transcripts

Selected	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMAD6	ENST00000288840.10	TSL:1 MANE Select	c.362G>C	p.Cys121Ser	missense	Exon 1 of 4	ENSP00000288840.5
	SMAD6	ENST00000557916.5	TSL:1	n.362G>C		non_coding_transcript_exon	Exon 1 of 5	ENSP00000452955.1
	SMAD6	ENST00000612349.1	TSL:6	n.544G>C		non_coding_transcript_exon	Exon 1 of 1

Frequencies

GnomAD3 genomes AF: 0.00000662 AC: 1 AN: 151010 Hom.: 0 Cov.: 33

Gnomad AFR AF: 0.0000242

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 Data not reliable, filtered out with message: AC0 AF: 0.00 AC: 0 AN: 1080210 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 513618

African (AFR) AF: 0.00 AC: 0 AN: 22162

American (AMR) AF: 0.00 AC: 0 AN: 7956

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 13146

East Asian (EAS) AF: 0.00 AC: 0 AN: 25050

South Asian (SAS) AF: 0.00 AC: 0 AN: 19836

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 29480

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 2856

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 917266

Other (OTH) AF: 0.00 AC: 0 AN: 42458

GnomAD4 genome AF: 0.00000662 AC: 1 AN: 151010 Hom.: 0 Cov.: 33 AF XY: 0.0000136 AC XY: 1 AN XY: 73762

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5.

African (AFR) AF: 0.0000242 AC: 1 AN: 41320

American (AMR) AF: 0.00 AC: 0 AN: 15174

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 3458

East Asian (EAS) AF: 0.00 AC: 0 AN: 5154

South Asian (SAS) AF: 0.00 AC: 0 AN: 4826

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 10166

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

European-Non Finnish (NFE) AF: 0.00 AC: 0 AN: 67616

Other (OTH) AF: 0.00 AC: 0 AN: 2072

⚠️ The allele balance in gnomAD version 4 Genomes is significantly skewed from the expected value of 0.5. (p-value = 0), which strongly suggests a high chance of mosaicism in these individuals.

Alfa AF: 0.00 Hom.: 0

Bravo AF: 0.0000227

ClinVar

Not reported in ClinVar

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
AlphaMissense	Benign	0.092
BayesDel_addAF	Uncertain	0.11	D
BayesDel_noAF	Uncertain	-0.080
CADD	Benign	20
DANN	Benign	0.96
DEOGEN2	Benign	0.31	T
Eigen	Benign	-0.27
Eigen_PC	Benign	-0.12
FATHMM_MKL	Uncertain	0.95	D
LIST_S2	Benign	0.58	T
M_CAP	Pathogenic	0.66	D
MetaRNN	Benign	0.20	T
MetaSVM	Benign	-0.83	T
MutationAssessor	Benign	0.95	L
PhyloP100		2.9
PrimateAI	Pathogenic	0.96	D
PROVEAN	Benign	-0.46	N
REVEL	Uncertain	0.40
Sift	Benign	0.21	T
Sift4G	Benign	0.57	T
Polyphen		0.030	B
Vest4		0.33
MutPred		0.21		Gain of relative solvent accessibility (P = 0.005)
MVP		0.77
MPC		1.4
ClinPred		0.32	T
GERP RS		3.9
Varity_R		0.19
gMVP		0.39
Mutation Taster		=67/33	polymorphism

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

Other links and lift over

dbSNP: rs80232004; hg19: chr15-66995958;