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A novel SMAD6 variant in a patient with severely calcified bicuspid aortic valve and thoracic aortic aneurysm.

Mol Genet Genomic Med. 2019 May;7(5):e620. doi:10.1002/mgg3.620. Epub 2019 Mar 08
Jong Eun Park 1 , Jin Seok Park 2 , Shin Yi Jang 3 , Seok Hee Park 2 , Jong-Won Kim 1 , Chang-Seok Ki 4 , Duk-Kyung Kim 3
Jong Eun Park 1 , Jin Seok Park 2 , Shin Yi Jang 3 , Seok Hee Park 2 , Jong-Won Kim 1 , Chang-Seok Ki 4 , Duk-Kyung Kim 3
+ et al

[No authors listed]

Author information
  • 1 Department of Laboratory Medicine and Genetics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
  • 2 Department of Biological Sciences, Sungkyunkwan University, Suwon, Korea.
  • 3 Division of Cardiology, Department of Medicine, Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
  • 4 Green Cross Genome, Yongin, Korea.

摘要


BACKGROUND:Bicuspid aortic valve (BAV) is the most common congenital heart defect with a prevalence of 1%-2% in the general population. NOTCH1, SMAD6, and GATA5 are associated with BAV in humans, but few cases have been reported that did not involve NOTCH1. Here, we identified novel in-frame variants in SMAD6 (c.1168_1173dup; p.Gly390_Ile391dup) in a BAV patient, who presented with dilatation of the ascending aorta and severe calcification of the aortic valve. METHODS:Twenty BAV associated genes were screened by exome sequencing. Functional effects of SMAD6 variant were investigated using bone morphogenetic protein (BMP) signaling assays through in vitro functional study. RESULTS:Exome sequencing revealed he had novel in-frame variants in the SMAD6 gene (c.1168_1173dup; p.Gly390_Ile391dup). SMAD6 is known to be an inhibitory protein in the BMP signaling pathway. In vitro functional study of the p.Gly390_Ile391dup variant revealed impaired inhibition of BMP signaling and BMP-induced alkaline phosphatase activity. CONCLUSION:In conclusion, we identified a novel SMAD6 variant causing a severely calcified BAV and TAA, which contributes to our understanding of the clinical and genetic background of SMAD6-related BAV.

KEYWORDS: SMAD6 , bicuspid aortic valve, whole exome sequencing