Sitosterolemia: Difference between revisions
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{{Infobox medical condition | |||
| name = Sitosterolemia | |||
| image = [[File:Autosomal_recessive_-_en.svg|200px]] | |||
| caption = Sitosterolemia is inherited in an [[autosomal recessive]] pattern. | |||
| synonyms = Phytosterolemia | |||
| pronounce = | |||
| specialty = [[Endocrinology]], [[Genetics]] | |||
| symptoms = [[Xanthomas]], [[premature atherosclerosis]], [[hemolytic anemia]] | |||
| complications = [[Cardiovascular disease]], [[gallstones]] | |||
| onset = Childhood | |||
| duration = Lifelong | |||
| causes = Mutations in the [[ABCG5]] or [[ABCG8]] genes | |||
| risks = | |||
| diagnosis = [[Blood test]], [[genetic testing]] | |||
| differential = [[Familial hypercholesterolemia]], [[sitosterol storage disease]] | |||
| prevention = | |||
| treatment = [[Dietary modification]], [[ezetimibe]] | |||
| medication = | |||
| prognosis = Variable, depends on management | |||
| frequency = Rare | |||
| deaths = | |||
}} | |||
{{Short description|A rare genetic disorder affecting cholesterol metabolism}} | {{Short description|A rare genetic disorder affecting cholesterol metabolism}} | ||
'''Sitosterolemia''', also known as '''phytosterolemia''', is a rare [[autosomal recessive]] genetic disorder characterized by the accumulation of dietary [[plant sterols]] in the blood and tissues. This condition is caused by mutations in the [[ABCG5]] or [[ABCG8]] genes, which are responsible for regulating the absorption and excretion of sterols. | '''Sitosterolemia''', also known as '''phytosterolemia''', is a rare [[autosomal recessive]] genetic disorder characterized by the accumulation of dietary [[plant sterols]] in the blood and tissues. This condition is caused by mutations in the [[ABCG5]] or [[ABCG8]] genes, which are responsible for regulating the absorption and excretion of sterols. | ||
==Pathophysiology== | ==Pathophysiology== | ||
Sitosterolemia is inherited in an [[autosomal recessive]] manner, meaning that an individual must inherit two copies of the mutated gene, one from each parent, to manifest the disease. The ABCG5 and ABCG8 genes encode proteins that form a transporter complex in the [[enterocyte]]s of the [[small intestine]] and in the [[liver]]. This complex is responsible for limiting the absorption of dietary sterols and promoting their excretion into the bile. | Sitosterolemia is inherited in an [[autosomal recessive]] manner, meaning that an individual must inherit two copies of the mutated gene, one from each parent, to manifest the disease. The ABCG5 and ABCG8 genes encode proteins that form a transporter complex in the [[enterocyte]]s of the [[small intestine]] and in the [[liver]]. This complex is responsible for limiting the absorption of dietary sterols and promoting their excretion into the bile. | ||
In individuals with sitosterolemia, mutations in these genes lead to defective transporter function, resulting in increased absorption and decreased excretion of plant sterols, such as [[sitosterol]], [[campesterol]], and [[stigmasterol]]. This accumulation of sterols can lead to the formation of [[xanthomas]], premature [[atherosclerosis]], and other complications. | In individuals with sitosterolemia, mutations in these genes lead to defective transporter function, resulting in increased absorption and decreased excretion of plant sterols, such as [[sitosterol]], [[campesterol]], and [[stigmasterol]]. This accumulation of sterols can lead to the formation of [[xanthomas]], premature [[atherosclerosis]], and other complications. | ||
==Clinical Features== | ==Clinical Features== | ||
Patients with sitosterolemia may present with a variety of symptoms, including: | Patients with sitosterolemia may present with a variety of symptoms, including: | ||
* [[Xanthomas]]: These are cholesterol-rich deposits that can appear on the skin, particularly on the elbows, knees, and buttocks. | * [[Xanthomas]]: These are cholesterol-rich deposits that can appear on the skin, particularly on the elbows, knees, and buttocks. | ||
* [[Atherosclerosis]]: The accumulation of sterols can lead to the premature development of atherosclerosis, increasing the risk of [[cardiovascular disease]]. | * [[Atherosclerosis]]: The accumulation of sterols can lead to the premature development of atherosclerosis, increasing the risk of [[cardiovascular disease]]. | ||
* [[Hematological abnormalities]]: Some patients may experience [[hemolytic anemia]] and [[thrombocytopenia]]. | * [[Hematological abnormalities]]: Some patients may experience [[hemolytic anemia]] and [[thrombocytopenia]]. | ||
* [[Arthralgia]]: Joint pain may occur due to the deposition of sterols in the joints. | * [[Arthralgia]]: Joint pain may occur due to the deposition of sterols in the joints. | ||
==Diagnosis== | ==Diagnosis== | ||
The diagnosis of sitosterolemia is based on clinical evaluation, laboratory testing, and genetic analysis. Laboratory tests typically reveal elevated levels of plant sterols in the blood. Genetic testing can confirm mutations in the ABCG5 or ABCG8 genes. | The diagnosis of sitosterolemia is based on clinical evaluation, laboratory testing, and genetic analysis. Laboratory tests typically reveal elevated levels of plant sterols in the blood. Genetic testing can confirm mutations in the ABCG5 or ABCG8 genes. | ||
==Management== | ==Management== | ||
Management of sitosterolemia involves dietary modifications and pharmacological interventions. Patients are advised to follow a diet low in plant sterols, which includes avoiding foods high in [[nuts]], [[seeds]], and [[vegetable oils]]. | Management of sitosterolemia involves dietary modifications and pharmacological interventions. Patients are advised to follow a diet low in plant sterols, which includes avoiding foods high in [[nuts]], [[seeds]], and [[vegetable oils]]. | ||
Pharmacological treatment may include the use of [[ezetimibe]], a medication that inhibits the absorption of sterols in the intestine. In some cases, [[bile acid sequestrants]] may also be used to reduce sterol levels. | Pharmacological treatment may include the use of [[ezetimibe]], a medication that inhibits the absorption of sterols in the intestine. In some cases, [[bile acid sequestrants]] may also be used to reduce sterol levels. | ||
==Prognosis== | ==Prognosis== | ||
With appropriate management, individuals with sitosterolemia can lead relatively normal lives. However, without treatment, the risk of cardiovascular complications and other health issues increases significantly. | With appropriate management, individuals with sitosterolemia can lead relatively normal lives. However, without treatment, the risk of cardiovascular complications and other health issues increases significantly. | ||
==See also== | |||
== | |||
* [[Hyperlipidemia]] | * [[Hyperlipidemia]] | ||
* [[Cholesterol]] | * [[Cholesterol]] | ||
* [[Genetic disorders]] | * [[Genetic disorders]] | ||
[[Category:Genetic disorders]] | [[Category:Genetic disorders]] | ||
[[Category:Metabolic disorders]] | [[Category:Metabolic disorders]] | ||
Latest revision as of 18:22, 8 April 2025
Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
Founder, WikiMD Wellnesspedia &
W8MD's medical weight loss NYC, sleep center NYC
Philadelphia medical weight loss and Philadelphia sleep clinics
| Sitosterolemia | |
|---|---|
| |
| Synonyms | Phytosterolemia |
| Pronounce | |
| Specialty | Endocrinology, Genetics |
| Symptoms | Xanthomas, premature atherosclerosis, hemolytic anemia |
| Complications | Cardiovascular disease, gallstones |
| Onset | Childhood |
| Duration | Lifelong |
| Types | N/A |
| Causes | Mutations in the ABCG5 or ABCG8 genes |
| Risks | |
| Diagnosis | Blood test, genetic testing |
| Differential diagnosis | Familial hypercholesterolemia, sitosterol storage disease |
| Prevention | |
| Treatment | Dietary modification, ezetimibe |
| Medication | |
| Prognosis | Variable, depends on management |
| Frequency | Rare |
| Deaths | |
A rare genetic disorder affecting cholesterol metabolism
Sitosterolemia, also known as phytosterolemia, is a rare autosomal recessive genetic disorder characterized by the accumulation of dietary plant sterols in the blood and tissues. This condition is caused by mutations in the ABCG5 or ABCG8 genes, which are responsible for regulating the absorption and excretion of sterols.
Pathophysiology[edit]
Sitosterolemia is inherited in an autosomal recessive manner, meaning that an individual must inherit two copies of the mutated gene, one from each parent, to manifest the disease. The ABCG5 and ABCG8 genes encode proteins that form a transporter complex in the enterocytes of the small intestine and in the liver. This complex is responsible for limiting the absorption of dietary sterols and promoting their excretion into the bile. In individuals with sitosterolemia, mutations in these genes lead to defective transporter function, resulting in increased absorption and decreased excretion of plant sterols, such as sitosterol, campesterol, and stigmasterol. This accumulation of sterols can lead to the formation of xanthomas, premature atherosclerosis, and other complications.
Clinical Features[edit]
Patients with sitosterolemia may present with a variety of symptoms, including:
- Xanthomas: These are cholesterol-rich deposits that can appear on the skin, particularly on the elbows, knees, and buttocks.
- Atherosclerosis: The accumulation of sterols can lead to the premature development of atherosclerosis, increasing the risk of cardiovascular disease.
- Hematological abnormalities: Some patients may experience hemolytic anemia and thrombocytopenia.
- Arthralgia: Joint pain may occur due to the deposition of sterols in the joints.
Diagnosis[edit]
The diagnosis of sitosterolemia is based on clinical evaluation, laboratory testing, and genetic analysis. Laboratory tests typically reveal elevated levels of plant sterols in the blood. Genetic testing can confirm mutations in the ABCG5 or ABCG8 genes.
Management[edit]
Management of sitosterolemia involves dietary modifications and pharmacological interventions. Patients are advised to follow a diet low in plant sterols, which includes avoiding foods high in nuts, seeds, and vegetable oils. Pharmacological treatment may include the use of ezetimibe, a medication that inhibits the absorption of sterols in the intestine. In some cases, bile acid sequestrants may also be used to reduce sterol levels.
Prognosis[edit]
With appropriate management, individuals with sitosterolemia can lead relatively normal lives. However, without treatment, the risk of cardiovascular complications and other health issues increases significantly.
