A missense TGFB2 variant p.(Arg320Cys) causes a paradoxical and striking increase in aortic TGFB1/2 expression

Raya Al Maskari, Yasmin, S. Cleary, Nikki Figg, Sarju Mehta, Doris Rassl, Ian Wilkinson, Kevin M. O'Shaughnessy*

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Loeys-Dietz syndrome (LDS) is an autosomal dominant connective tissue disorder with a range of cardiovascular, skeletal, craniofacial and cutaneous manifestations. LDS type 4 is caused by mutations in TGFβ ligand 2 (TGFB2) and based on the family pedigrees described to date, appears to have a milder clinical phenotype, often presenting with isolated aortic disease. We sought to investigate its molecular basis in a new pedigree. We identified a missense variant p.(Arg320Cys) (NM-003238.3) in a highly evolutionary conserved region of TGFB2 in a new LDS type 4 pedigree with multiple cases of aortic aneurysms and dissections. There was striking upregulation of TGFB1 and TGFB2 expression on immunofluorescent staining, and western blotting of the aortic tissue from the index case confirming the functional importance of the variant. This case highlights the striking paradox of predicted loss-of-function mutations in TGFB2 causing enhanced TGFβ signaling in this emerging familial aortopathy.

Original languageEnglish
Pages (from-to)157-160
Number of pages4
JournalEuropean Journal of Human Genetics
Volume25
Issue number1
DOIs
Publication statusPublished - Jan 2017
Externally publishedYes

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    Al Maskari, R., Yasmin, Cleary, S., Figg, N., Mehta, S., Rassl, D., ... O'Shaughnessy, K. M. (2017). A missense TGFB2 variant p.(Arg320Cys) causes a paradoxical and striking increase in aortic TGFB1/2 expression. European Journal of Human Genetics, 25(1), 157-160. https://doi.org/10.1038/ejhg.2016.143