rs1555412070

Variant names:

• chr15-67164933-G-GGC
• rs1555412070
• NM_005902.4:c.246_247dupGC

Variant summary

Our verdict is Pathogenic. The variant received 12 ACMG points: 12P and 0B. PVS1 PM2 PP5_Moderate

The NM_005902.4(SMAD3):​c.246_247dupGC​(p.Leu83ArgfsTer34) variant causes a frameshift change involving the alteration of a non-conserved nucleotide. The variant was absent in control chromosomes in GnomAD project. Variant has been reported in ClinVar as Pathogenic (★). Synonymous variant affecting the same amino acid position (i.e. L83L) has been classified as Likely benign. Variant results in nonsense mediated mRNA decay.

• Frequency: Genomes: not found (cov: 33)
• Consequence: SMAD3 NM_005902.4 frameshift
• Clinical Significance: Pathogenic criteria provided, single submitter P:1
• Conservation: PhyloP100: -0.0850
• Publications: 0 publications found

Genes affected

SMAD3 (HGNC:6769): (SMAD family member 3) The SMAD family of proteins are a group of intracellular signal transducer proteins similar to the gene products of the Drosophila gene 'mothers against decapentaplegic' (Mad) and the C. elegans gene Sma. The SMAD3 protein functions in the transforming growth factor-beta signaling pathway, and transmits signals from the cell surface to the nucleus, regulating gene activity and cell proliferation. This protein forms a complex with other SMAD proteins and binds DNA, functioning both as a transcription factor and tumor suppressor. Mutations in this gene are associated with aneurysms-osteoarthritis syndrome and Loeys-Dietz Syndrome 3. [provided by RefSeq, May 2022]

SMAD3 Gene-Disease associations (from GenCC):

• aneurysm-osteoarthritis syndrome

  Inheritance: Unknown, AD Classification: DEFINITIVE, STRONG, SUPPORTIVE Submitted by: ClinGen, G2P, Genomics England PanelApp, Orphanet, Labcorp Genetics (formerly Invitae)
• familial thoracic aortic aneurysm and aortic dissection

  Inheritance: Unknown, AD Classification: DEFINITIVE, SUPPORTIVE Submitted by: ClinGen, Orphanet

ACMG classification

Our verdict: Pathogenic. The variant received 12 ACMG points.

• PVS1: Loss of function variant, product undergoes nonsense mediated mRNA decay. LoF is a known mechanism of disease.
• PM2: Very rare variant in population databases, with high coverage
• PP5: Variant 15-67164933-G-GGC is Pathogenic according to our data. Variant chr15-67164933-G-GGC is described in ClinVar as Pathogenic. ClinVar VariationId is 405565.Status of the report is criteria_provided_single_submitter, 1 stars.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005902.4. You can select a different transcript below to see updated ACMG assignments.

RefSeq Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMAD3	NM_005902.4	MANE Select	c.246_247dupGC	p.Leu83ArgfsTer34	frameshift	Exon 2 of 9	NP_005893.1	P84022-1
	SMAD3	NM_001407011.1		c.246_247dupGC	p.Leu83ArgfsTer34	frameshift	Exon 2 of 10	NP_001393940.1	H3BQ00
	SMAD3	NM_001145103.2		c.114_115dupGC	p.Leu39ArgfsTer34	frameshift	Exon 2 of 9	NP_001138575.1	P84022-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMAD3	ENST00000327367.9	TSL:1 MANE Select	c.246_247dupGC	p.Leu83ArgfsTer34	frameshift	Exon 2 of 9	ENSP00000332973.4	P84022-1
	SMAD3	ENST00000439724.7	TSL:1	c.114_115dupGC	p.Leu39ArgfsTer34	frameshift	Exon 2 of 9	ENSP00000401133.3	P84022-2
	SMAD3	ENST00000540846.6	TSL:1	c.-70_-69dupGC		5_prime_UTR	Exon 2 of 9	ENSP00000437757.2	P84022-3

Frequencies

GnomAD3 genomes Cov.: 33

GnomAD4 exome Cov.: 31

GnomAD4 genome Cov.: 33

ClinVar

ClinVar submissions

Significance: Pathogenic

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
1	-	-	Familial thoracic aortic aneurysm and aortic dissection (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
PhyloP100		-0.085
Mutation Taster		=0/200	disease causing (ClinVar)

Splicing

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

Other links and lift over

dbSNP: rs1555412070; hg19: chr15-67457271;