Which are the causes of Arterial Tortuosity Syndrome?

Arterial Tortuosity Syndrome is a rare genetic connective tissue disorder caused by mutations in the SLC2A10 gene, which provides instructions for producing the protein GLUT10. These genetic changes disrupt the structural integrity of the arterial walls, leading to the characteristic elongation, twisting, and narrowing (stenosis) of the body's major blood vessels.

What causes Arterial Tortuosity Syndrome?

The primary cause of Arterial Tortuosity Syndrome is a pathogenic variant in the SLC2A10 gene. This gene is responsible for regulating the function of elastic fibers within the walls of arteries. When this gene is mutated, the arterial walls lose their ability to maintain proper tension and shape, resulting in the "tortuous" or winding appearance seen in patients with Arterial Tortuosity Syndrome.

Is Arterial Tortuosity Syndrome hereditary?

Yes, Arterial Tortuosity Syndrome is inherited in an autosomal recessive pattern. This means an individual must inherit two copies of the mutated gene—one from each parent—to manifest the condition. Parents of an affected child are typically asymptomatic carriers, each carrying one copy of the SLC2A10 mutation. In families with one child diagnosed with Arterial Tortuosity Syndrome, there is a 25% chance for each subsequent pregnancy to also be affected.

What mechanisms underlie the vessel damage?

Research indicates that the SLC2A10 protein, GLUT10, plays a critical role in the transport of glucose and vitamin C within cells. The biological impact of these mutations includes:

• Disruption of the TGF-beta (transforming growth factor-beta) signaling pathway, which is essential for healthy tissue development.


• Fragmentation and disorganization of elastic fibers in the arterial media.


• Increased susceptibility to mechanical stress on vessel walls, leading to aneurysms or stenoses.

Is the etiology of Arterial Tortuosity Syndrome fully understood?

While the genetic basis of Arterial Tortuosity Syndrome is well-defined, researchers are still investigating exactly how GLUT10 deficiency leads to specific arterial phenotypes. Current studies focus on the role of vitamin C metabolism and how it influences collagen and elastin stability. As our DiseaseMaps.org community of 7 members demonstrates, ongoing patient data collection is vital for clinical researchers to better understand the variable progression of Arterial Tortuosity Syndrome.

Next steps

• Consult with a clinical geneticist to discuss family planning and carrier testing for Arterial Tortuosity Syndrome.


• Schedule regular screenings with a vascular cardiologist to monitor arterial health.


• Join the DiseaseMaps.org community to connect with other families navigating this diagnosis.

Medical disclaimer: This content is for informational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Arterial Tortuosity Syndrome.


• Orphanet: Rare Disease Database (ORPHA:93928).


• OMIM (Online Mendelian Inheritance in Man): #208050.