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Loeys-Dietz Syndrome.

Joe D Velchev¹, Lut Van Laer¹, Ilse Luyckx^1,2

¹Center for Medical Genetics, Antwerp University Hospital/University of Antwerp, Antwerp, Belgium.

Advances in Experimental Medicine and Biology

|November 22, 2021

Summary

This summary is machine-generated.

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.

Keywords:

Acetabular protrusion Amblyopia Aneurysm- osteoarthritis syndrome Aortic aneurysm with tortuosity Aortic dissection Arachnodactyly Bifid uvula/cleft palate Blue sclerae Cervical spine malformation Craniosynostosis Cutis laxa Dilatation of aortic root Dystrophic scars Easy bruising Familial thoracic aortic aneurysm Hypertelorism Increased TGFβ signalling Joint laxity Loeys-Dietz syndrome MYH11 and MYLK Mutations in ACTA2 Mutations in SKI Mutations in TGFBR1 Myopia Osteoporosis Overlap with Marfan and Ehlers-Danlos syndrome Pectus excavatum or pectus carinatum Peripartal uterine rupture Pes planus Retrognathia SMAD3 or TGFB2 Scoliosis Shprintzen-Goldberg syndrome Spondylolisthesis Spontaneous bowel rupture Strabismus TGFBR2 Talipes equinovarus Translucent skin

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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.