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Update on Sitosterolemia and Atherosclerosis.

Viviane Zorzanelli Rocha1,2, Mauricio Teruo Tada3, Ana Paula Marte Chacra4

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Summary

Sitosterolemia is a rare inherited lipid disorder causing high plant sterol levels due to ABCG5/ABCG8 gene variants. Early diagnosis and treatment with diet and ezetimibe are crucial for managing xanthomatosis and preventing atherosclerotic disease.

Keywords:
AtherosclerosisCholesterolHypercholesterolemiaPlant sterolsSitosterolemiaXanthomas

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Area of Science:

  • Lipidology
  • Genetics
  • Cardiovascular Disease

Background:

  • Sitosterolemia is an inherited lipid disorder characterized by elevated plasma plant sterols.
  • It results from genetic variants in ABCG5 or ABCG8, impairing sterol excretion.
  • Patients often present with xanthomatosis, hypercholesterolemia, and premature atherosclerosis.

Purpose of the Study:

  • To summarize updated information on sitosterolemia.
  • To highlight the importance of recognizing this condition, which can mimic familial hypercholesterolemia.
  • To discuss diagnostic and therapeutic strategies.

Main Methods:

  • Review of current literature on sitosterolemia.
  • Genetic analysis for ABCG5/ABCG8 variants.
  • Assessment of plasma phytosterol levels.

Main Results:

  • Sitosterolemia is caused by loss-of-function variants in ABCG5 or ABCG8.
  • Clinical presentation is heterogeneous, including xanthomatosis and early atherosclerotic disease.
  • Genetic variants in ABCG5/ABCG8 can mimic familial hypercholesterolemia.

Conclusions:

  • Sitosterolemia is a rare, underdiagnosed, but treatable cause of premature atherosclerotic disease.
  • High index of suspicion is needed for diagnosis, confirmed by genetic testing or plasma phytosterol measurement.
  • Treatment involves a plant sterol-restricted diet and ezetimibe, effectively reducing plasma plant sterol levels.