Sitosterolemia - Revision history

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2025-04-08T18:22:30Z

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			{{SI}}
			{{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}}
	~~{{Use dmy dates\|date=October 2023}}~~

	'''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==
	~~[[File:Autosomal_recessive_-_en.svg\|thumb\|right\|Diagram of autosomal recessive inheritance]]~~
	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==
	==~~Related pages~~==
	* [[Hyperlipidemia]]		* [[Hyperlipidemia]]
	* [[Cholesterol]]		* [[Cholesterol]]
	* [[Genetic disorders]]		* [[Genetic disorders]]

	[[Category:Genetic disorders]]		[[Category:Genetic disorders]]
	[[Category:Metabolic disorders]]		[[Category:Metabolic disorders]]

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2025-02-16T05:50:06Z

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← Older revision		Revision as of 05:50, 16 February 2025
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	~~'''Sitosterolemia''' is a~~ rare~~, autosomal recessive~~ disorder that is characterized by the accumulation of plant sterols in the body. It is caused by mutations in either the ABCG5 or ABCG8 genes, which encode for the ATP-binding cassette (ABC) transporters that are responsible for the efflux of plant sterols from the body.		{{Short description\|A rare genetic disorder affecting cholesterol metabolism}}
			{{Use dmy dates\|date=October 2023}}

	~~== Symptoms ==~~		'''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.
	~~The symptoms of sitosterolemia can vary greatly among affected individuals. Some may be asymptomatic~~, ~~while others may present with xanthomas, arthralgia~~, and ~~premature atherosclerosis~~. ~~Hematologic abnormalities such as macrothrombocytopenia, stomatocytosis~~, and ~~hemolytic anemia can also occur~~.

	== ~~Diagnosis~~ ==		==Pathophysiology==
	~~The diagnosis~~ of ~~sitosterolemia~~ is ~~based on~~ the ~~clinical findings~~, the ~~presence~~ of ~~elevated plant sterol levels~~ in the ~~plasma, and~~ the ~~identification~~ of ~~a pathogenic variant in either~~ the ~~ABCG5 or ABCG8 gene~~.		[[File:Autosomal_recessive_-_en.svg\|thumb\|right\|Diagram of autosomal recessive inheritance]]
			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.

	~~== Treatment ==~~		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.
	~~The treatment of~~ sitosterolemia ~~involves dietary modifications~~ to ~~reduce the intake of plant sterols~~, ~~the use of bile acid sequestrants to reduce the~~ absorption of plant sterols, and ~~the use~~ of ~~ezetimibe~~ to ~~inhibit~~ the ~~intestinal absorption~~ of ~~dietary cholesterol~~ and ~~plant sterols~~.

	== ~~Prognosis~~ ==		==Clinical Features==
	~~The prognosis for individuals~~ with sitosterolemia ~~is generally good~~ with ~~early diagnosis and treatment. However~~, ~~if left untreated, the disease can lead to premature atherosclerosis and other complications.~~		Patients with sitosterolemia may present with a variety of symptoms, including:

	~~== See also ==~~		* [[Xanthomas]]: These are cholesterol-rich deposits that can appear on the skin, particularly on the elbows, knees, and buttocks.
	* [[~~Hypercholesterolemia~~]]		* [[Atherosclerosis]]: The accumulation of sterols can lead to the premature development of atherosclerosis, increasing the risk of [[cardiovascular disease]].
	* [[~~Xanthoma~~]]		* [[Hematological abnormalities]]: Some patients may experience [[hemolytic anemia]] and [[thrombocytopenia]].
	* [[~~Atherosclerosis~~]]		* [[Arthralgia]]: Joint pain may occur due to the deposition of sterols in the joints.
	* [[~~ABCG5~~]]
	* [[~~ABCG8~~]]

	== ~~References~~ ==		==Diagnosis==
	~~<references />~~		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.

	[[~~Category:Rare diseases~~]]		==Management==
	[[Category:Genetic ~~diseases~~]]		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==
			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.

			==Related pages==
			* [[Hyperlipidemia]]
			* [[Cholesterol]]
			* [[Genetic disorders]]

			[[Category:Genetic disorders]]
	[[Category:Metabolic disorders]]		[[Category:Metabolic disorders]]
	~~[[Category:Cholesterol]]~~

	~~{{stub}}~~

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2024-02-25T05:49:05Z

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New page

'''Sitosterolemia''' is a rare, autosomal recessive disorder that is characterized by the accumulation of plant sterols in the body. It is caused by mutations in either the ABCG5 or ABCG8 genes, which encode for the ATP-binding cassette (ABC) transporters that are responsible for the efflux of plant sterols from the body.

== Symptoms ==
The symptoms of sitosterolemia can vary greatly among affected individuals. Some may be asymptomatic, while others may present with xanthomas, arthralgia, and premature atherosclerosis. Hematologic abnormalities such as macrothrombocytopenia, stomatocytosis, and hemolytic anemia can also occur.

== Diagnosis ==
The diagnosis of sitosterolemia is based on the clinical findings, the presence of elevated plant sterol levels in the plasma, and the identification of a pathogenic variant in either the ABCG5 or ABCG8 gene.

== Treatment ==
The treatment of sitosterolemia involves dietary modifications to reduce the intake of plant sterols, the use of bile acid sequestrants to reduce the absorption of plant sterols, and the use of ezetimibe to inhibit the intestinal absorption of dietary cholesterol and plant sterols.

== Prognosis ==
The prognosis for individuals with sitosterolemia is generally good with early diagnosis and treatment. However, if left untreated, the disease can lead to premature atherosclerosis and other complications.

== See also ==
* [[Hypercholesterolemia]]
* [[Xanthoma]]
* [[Atherosclerosis]]
* [[ABCG5]]
* [[ABCG8]]

== References ==
<references />

[[Category:Rare diseases]]
[[Category:Genetic diseases]]
[[Category:Metabolic disorders]]
[[Category:Cholesterol]]

{{stub}}