18-47841890-C-T

Variant names:

• chr18-47841890-C-T
• rs2144276540
• NM_005901.6:c.1341G>A

Variant summary

Our verdict is Likely benign. The variant received -3 ACMG points: 2P and 5B. PM2 BP4_Moderate BP6_Moderate BP7

The NM_005901.6(SMAD2):​c.1341G>A​(p.Gln447Gln) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.000000684 in 1,461,764 control chromosomes in the GnomAD database, with no homozygous occurrence. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★).

• Frequency:
  • Genomes: not found (cov: 32)
  • Exomes 𝑓: 6.8e-7 (0 hom.)
• Consequence: SMAD2 NM_005901.6 synonymous
• Clinical Significance: Likely benign criteria provided, single submitter B:1
• Conservation: PhyloP100: 0.758
• Publications: 0 publications found

Genes affected

SMAD2 (HGNC:6768): (SMAD family member 2) The protein encoded by this gene belongs to the SMAD, a family of proteins similar to the gene products of the Drosophila gene 'mothers against decapentaplegic' (Mad) and the C. elegans gene Sma. SMAD proteins are signal transducers and transcriptional modulators that mediate multiple signaling pathways. This protein mediates the signal of the transforming growth factor (TGF)-beta, and thus regulates multiple cellular processes, such as cell proliferation, apoptosis, and differentiation. This protein is recruited to the TGF-beta receptors through its interaction with the SMAD anchor for receptor activation (SARA) protein. In response to TGF-beta signal, this protein is phosphorylated by the TGF-beta receptors. The phosphorylation induces the dissociation of this protein with SARA and the association with the family member SMAD4. The association with SMAD4 is important for the translocation of this protein into the nucleus, where it binds to target promoters and forms a transcription repressor complex with other cofactors. This protein can also be phosphorylated by activin type 1 receptor kinase, and mediates the signal from the activin. Alternatively spliced transcript variants have been observed for this gene. [provided by RefSeq, May 2012]

SMAD2 Gene-Disease associations (from GenCC):

• congenital heart disease

  Inheritance: AD Classification: DEFINITIVE, MODERATE Submitted by: ClinGen, Ambry Genetics
• Loeys-Dietz syndrome 6

  Inheritance: AD Classification: DEFINITIVE, STRONG, MODERATE Submitted by: PanelApp Australia, Ambry Genetics, Labcorp Genetics (formerly Invitae), ClinGen
• congenital heart defects, multiple types, 8, with or without heterotaxy

  Inheritance: AD Classification: STRONG, MODERATE, LIMITED Submitted by: PanelApp Australia, Ambry Genetics, G2P, Labcorp Genetics (formerly Invitae)
• Loeys-Dietz syndrome

  Inheritance: AD Classification: STRONG Submitted by: Genomics England PanelApp
• familial thoracic aortic aneurysm and aortic dissection

  Inheritance: AD Classification: SUPPORTIVE Submitted by: Orphanet

ACMG classification

Our verdict: Likely_benign. The variant received -3 ACMG points.

• PM2: Very rare variant in population databases, with high coverage
• BP4: Computational evidence support a benign effect (BayesDel_noAF=-0.38).
• BP6: Variant 18-47841890-C-T is Benign according to our data. Variant chr18-47841890-C-T is described in ClinVar as Likely_benign. ClinVar VariationId is 3445807.Status of the report is criteria_provided_single_submitter, 1 stars.
• BP7: Synonymous conserved (PhyloP=0.758 with no splicing effect.

Variant Effect in Transcripts

ACMG analysis was done for transcript: NM_005901.6. 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
	SMAD2	NM_005901.6	MANE Select	c.1341G>A	p.Gln447Gln	synonymous	Exon 11 of 11	NP_005892.1	Q15796-1
	SMAD2	NM_001003652.4		c.1341G>A	p.Gln447Gln	synonymous	Exon 11 of 11	NP_001003652.1	Q15796-1
	SMAD2	NM_001135937.3		c.1251G>A	p.Gln417Gln	synonymous	Exon 10 of 10	NP_001129409.1	Q15796-2

Ensembl Transcripts

Sel.	Gene	Transcript	Tags	HGVSc	HGVSp	Effect	Exon Rank	Protein	UniProt
	SMAD2	ENST00000262160.11	TSL:1 MANE Select	c.1341G>A	p.Gln447Gln	synonymous	Exon 11 of 11	ENSP00000262160.6	Q15796-1
	SMAD2	ENST00000402690.6	TSL:1	c.1341G>A	p.Gln447Gln	synonymous	Exon 11 of 11	ENSP00000384449.1	Q15796-1
	SMAD2	ENST00000356825.8	TSL:1	c.1251G>A	p.Gln417Gln	synonymous	Exon 10 of 10	ENSP00000349282.4	Q15796-2

Frequencies

GnomAD3 genomes Cov.: 32

GnomAD4 exome AF: 6.84e-7 AC: 1 AN: 1461764 Hom.: 0 Cov.: 31 AF XY: 0.00 AC XY: 0 AN XY: 727202

African (AFR) AF: 0.00 AC: 0 AN: 33474

American (AMR) AF: 0.00 AC: 0 AN: 44724

Ashkenazi Jewish (ASJ) AF: 0.00 AC: 0 AN: 26130

East Asian (EAS) AF: 0.00 AC: 0 AN: 39690

South Asian (SAS) AF: 0.00 AC: 0 AN: 86258

European-Finnish (FIN) AF: 0.00 AC: 0 AN: 53418

Middle Eastern (MID) AF: 0.00 AC: 0 AN: 5768

European-Non Finnish (NFE) AF: 8.99e-7 AC: 1 AN: 1111912

Other (OTH) AF: 0.00 AC: 0 AN: 60390

GnomAD4 genome Cov.: 32

ClinVar

ClinVar submissions

Significance: Likely benign

Revision: criteria provided, single submitter

Pathogenic	VUS	Benign	Condition
-	-	1	Inborn genetic diseases (1)

Computational scores

Source: dbNSFP v4.9

Name	Calibrated prediction	Score	Prediction
BayesDel_noAF	Benign	-0.38
CADD	Benign	6.3
DANN	Benign	0.67
PhyloP100		0.76

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: rs2144276540; hg19: chr18-45368261;