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Loeys-Dietz Syndrome
Joe D Velchev1, Lut Van Laer1, Ilse Luyckx1,2
1Center for Medical Genetics, Antwerp University Hospital/University of Antwerp, Antwerp, Belgium.
Advances in Experimental Medicine and Biology
|November 22, 2021
Summary
Loeys-Dietz syndrome involves aortic aneurysms and genetic mutations affecting TGFβ signaling. Despite loss-of-function mutations, aortic tissue shows increased TGFβ signaling, suggesting new therapeutic targets.
Area of Science:
- Genetics
- Cardiovascular Medicine
- Molecular Biology
Background:
- Loeys-Dietz syndrome is an autosomal dominant disorder causing aortic aneurysms and multisystemic issues.
- Key features include hypertelorism, bifid uvula/cleft palate, and aortic aneurysm with tortuosity.
- Patients face risks of aortic dissection at smaller diameters and widespread arterial aneurysms.
Purpose of the Study:
- To summarize the genetic basis and clinical manifestations of Loeys-Dietz syndrome.
- To investigate the paradoxical increase in TGFβ signaling in patient-derived aortic tissues.
- To explore potential therapeutic interventions based on signaling pathway insights.
Main Methods:
- Review of clinical and genetic data for Loeys-Dietz syndrome.
- Analysis of patient-derived aortic tissues to assess TGFβ signaling pathway activity.
- Correlation of genetic mutations with observed signaling phenotypes.
Main Results:
- Loeys-Dietz syndrome is linked to mutations in TGFβ pathway genes (TGFBR1, TGFBR2, SMAD2, SMAD3, TGFB2, TGFB3).
- Contrary to expectations from loss-of-function mutations, aortic tissues exhibit heightened TGFβ signaling.
- This suggests a complex downstream effect of these genetic alterations.
Conclusions:
- Understanding the paradoxical TGFβ signaling in Loeys-Dietz syndrome is crucial.
- These findings open avenues for targeted therapeutic strategies.
- Further research into TGFβ pathway modulation may benefit affected individuals.
Keywords:
Acetabular protrusionAmblyopiaAneurysm- osteoarthritis syndromeAortic aneurysm with tortuosityAortic dissectionArachnodactylyBifid uvula/cleft palateBlue scleraeCervical spine malformationCraniosynostosisCutis laxaDilatation of aortic rootDystrophic scarsEasy bruisingFamilial thoracic aortic aneurysmHypertelorismIncreased TGFβ signallingJoint laxityLoeys-Dietz syndromeMYH11 and MYLKMutations in ACTA2Mutations in SKIMutations in TGFBR1MyopiaOsteoporosisOverlap with Marfan and Ehlers-Danlos syndromePectus excavatum or pectus carinatumPeripartal uterine rupturePes planusRetrognathiaSMAD3 or TGFB2ScoliosisShprintzen-Goldberg syndromeSpondylolisthesisSpontaneous bowel ruptureStrabismusTGFBR2Talipes equinovarusTranslucent skin
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