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← Older revision		Revision as of 15:35, 8 April 2025
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	[[File:Autosomal_recessive_-_en.svg\|~~thumb~~\|~~Autosomal_recessive_-_en~~.~~svg~~]] '''Trichothiodystrophy''' ('''TTD''') is a rare [[genetic disorder]] characterized by brittle hair, intellectual disability, and a variety of other symptoms. The condition is named for the sulfur-deficient brittle hair that is a hallmark of the disorder. TTD is part of a group of disorders known as [[DNA repair]] disorders, which also includes [[xeroderma pigmentosum]] and [[Cockayne syndrome]].		{{SI}}
			{{Infobox medical condition
			\| name = Trichothiodystrophy
			\| image = [[File:Autosomal_recessive_-_en.svg\|200px]]
			\| caption = Trichothiodystrophy is inherited in an [[autosomal recessive]] pattern.
			\| synonyms = TTD, IBIDS syndrome, PIBIDS syndrome
			\| field = [[Medical genetics]]
			\| symptoms = Brittle hair, intellectual disability, photosensitivity, ichthyosis
			\| onset = [[Infancy]]
			\| duration = Lifelong
			\| causes = Mutations in [[ERCC2]], [[ERCC3]], [[GTF2H5]], [[TTC8]]
			\| risks = Genetic inheritance
			\| diagnosis = [[Genetic testing]], clinical evaluation
			\| differential = [[Xeroderma pigmentosum]], [[Cockayne syndrome]]
			\| treatment = Symptomatic management
			\| prognosis = Variable, depends on severity
			\| frequency = Rare
			}}
			'''Trichothiodystrophy''' ('''TTD''') is a rare [[genetic disorder]] characterized by brittle hair, intellectual disability, and a variety of other symptoms. The condition is named for the sulfur-deficient brittle hair that is a hallmark of the disorder. TTD is part of a group of disorders known as [[DNA repair]] disorders, which also includes [[xeroderma pigmentosum]] and [[Cockayne syndrome]].
	== Signs and Symptoms ==		== Signs and Symptoms ==
	Individuals with trichothiodystrophy often exhibit a range of symptoms, which can vary widely in severity. Common features include:		Individuals with trichothiodystrophy often exhibit a range of symptoms, which can vary widely in severity. Common features include:
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	* Recurrent infections		* Recurrent infections
	* Premature aging		* Premature aging

	== Genetics ==		== Genetics ==
	Trichothiodystrophy is typically inherited in an [[autosomal recessive]] manner, meaning that an individual must inherit two copies of the defective gene, one from each parent, to be affected. Several genes have been implicated in TTD, including [[ERCC2]], [[ERCC3]], and [[GTF2H5]], which are involved in the [[nucleotide excision repair]] pathway of DNA repair.		Trichothiodystrophy is typically inherited in an [[autosomal recessive]] manner, meaning that an individual must inherit two copies of the defective gene, one from each parent, to be affected. Several genes have been implicated in TTD, including [[ERCC2]], [[ERCC3]], and [[GTF2H5]], which are involved in the [[nucleotide excision repair]] pathway of DNA repair.

	== Diagnosis ==		== Diagnosis ==
	Diagnosis of trichothiodystrophy is based on clinical features, hair analysis, and genetic testing. The characteristic brittle hair can be identified through microscopic examination, which reveals the "tiger tail" banding pattern. Genetic testing can confirm mutations in the genes associated with TTD.		Diagnosis of trichothiodystrophy is based on clinical features, hair analysis, and genetic testing. The characteristic brittle hair can be identified through microscopic examination, which reveals the "tiger tail" banding pattern. Genetic testing can confirm mutations in the genes associated with TTD.

	== Treatment ==		== Treatment ==
	There is no cure for trichothiodystrophy, and treatment is primarily supportive and symptomatic. Management may include:		There is no cure for trichothiodystrophy, and treatment is primarily supportive and symptomatic. Management may include:
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	* Skin care for ichthyosis		* Skin care for ichthyosis
	* Sun protection for photosensitivity		* Sun protection for photosensitivity

	== Prognosis ==		== Prognosis ==
	The prognosis for individuals with trichothiodystrophy varies depending on the severity of symptoms. Some individuals may have a relatively mild form of the disorder, while others may experience significant health challenges and reduced life expectancy.		The prognosis for individuals with trichothiodystrophy varies depending on the severity of symptoms. Some individuals may have a relatively mild form of the disorder, while others may experience significant health challenges and reduced life expectancy.

	== See Also ==		== See Also ==
	* [[DNA repair]]		* [[DNA repair]]
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	* [[Cockayne syndrome]]		* [[Cockayne syndrome]]
	* [[Genetic disorder]]		* [[Genetic disorder]]

	== References ==		== References ==
	{{Reflist}}		{{Reflist}}

	== External Links ==		== External Links ==
	{{No external links}}		{{No external links}}

	[[Category:Genetic disorders]]		[[Category:Genetic disorders]]
	[[Category:Rare diseases]]		[[Category:Rare diseases]]
	[[Category:Autosomal recessive disorders]]		[[Category:Autosomal recessive disorders]]
	[[Category:DNA repair disorders]]		[[Category:DNA repair disorders]]

	{{Genetic-disorder-stub}}		{{Genetic-disorder-stub}}

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2024-05-22T17:09:29Z

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[[File:Autosomal_recessive_-_en.svg|thumb|Autosomal_recessive_-_en.svg]] '''Trichothiodystrophy''' ('''TTD''') is a rare [[genetic disorder]] characterized by brittle hair, intellectual disability, and a variety of other symptoms. The condition is named for the sulfur-deficient brittle hair that is a hallmark of the disorder. TTD is part of a group of disorders known as [[DNA repair]] disorders, which also includes [[xeroderma pigmentosum]] and [[Cockayne syndrome]].

== Signs and Symptoms ==
Individuals with trichothiodystrophy often exhibit a range of symptoms, which can vary widely in severity. Common features include:
* Brittle hair with a characteristic "tiger tail" banding pattern under polarized light microscopy
* Intellectual disability or developmental delay
* Short stature
* Ichthyosis (scaly skin)
* Photosensitivity
* Recurrent infections
* Premature aging

== Genetics ==
Trichothiodystrophy is typically inherited in an [[autosomal recessive]] manner, meaning that an individual must inherit two copies of the defective gene, one from each parent, to be affected. Several genes have been implicated in TTD, including [[ERCC2]], [[ERCC3]], and [[GTF2H5]], which are involved in the [[nucleotide excision repair]] pathway of DNA repair.

== Diagnosis ==
Diagnosis of trichothiodystrophy is based on clinical features, hair analysis, and genetic testing. The characteristic brittle hair can be identified through microscopic examination, which reveals the "tiger tail" banding pattern. Genetic testing can confirm mutations in the genes associated with TTD.

== Treatment ==
There is no cure for trichothiodystrophy, and treatment is primarily supportive and symptomatic. Management may include:
* Regular monitoring and treatment of infections
* Physical therapy and special education services for developmental delays
* Skin care for ichthyosis
* Sun protection for photosensitivity

== Prognosis ==
The prognosis for individuals with trichothiodystrophy varies depending on the severity of symptoms. Some individuals may have a relatively mild form of the disorder, while others may experience significant health challenges and reduced life expectancy.

== See Also ==
* [[DNA repair]]
* [[Xeroderma pigmentosum]]
* [[Cockayne syndrome]]
* [[Genetic disorder]]

== References ==
{{Reflist}}

== External Links ==
{{No external links}}

[[Category:Genetic disorders]]
[[Category:Rare diseases]]
[[Category:Autosomal recessive disorders]]
[[Category:DNA repair disorders]]

{{Genetic-disorder-stub}}

Trichothiodystrophy - Revision history

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