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

	'''18p-''' is a [[genetic disorder]] caused by the deletion of all or part of the short arm (p arm) of [[chromosome 18]]. This condition is ~~part of a group~~ of chromosomal deletion syndromes ~~that~~ can lead to a variety of developmental and physical abnormalities~~. The severity and specific symptoms of 18p- can vary widely among affected individuals~~.		'''18p-''' is a [[genetic disorder]] caused by the deletion of all or part of the short arm (p arm) of [[chromosome 18]]. This condition is one of the many [[chromosomal deletion syndromes]] and can lead to a variety of developmental and physical abnormalities.

	==Genetics==		==Genetics==
	[[File:Cebocephaly_(2).png\|Cebocephaly, a possible feature of 18p-\|thumb\|right]]		[[File:Cebocephaly_(2).png\|Cebocephaly, a possible feature of 18p-\|thumb\|right]]
	The human genome consists of 23 pairs of [[chromosomes]], each containing a long arm (q arm) and a short arm (p arm). In individuals with 18p-, there is a deletion of genetic material from the p arm of chromosome 18. The size of the deletion can vary, and ~~this variation can influence~~ the severity of ~~the~~ symptoms.		The human genome consists of 23 pairs of [[chromosomes]], each containing a long arm (q arm) and a short arm (p arm). In individuals with 18p-, there is a deletion of genetic material from the short arm of chromosome 18. The size of the deletion can vary, and the specific genes lost in the deletion determine the severity and range of symptoms.

	The deletion can occur de novo, meaning it is a new mutation that ~~occurs during~~ the ~~formation of reproductive cells~~ or ~~in early fetal development. In some cases, the deletion may~~ be inherited from a parent who carries a balanced translocation ~~involving chromosome 18~~.		The deletion can occur de novo, meaning it is a new mutation that arises in the individual, or it can be inherited from a parent who carries a balanced [[chromosomal translocation]].

	==Symptoms==		==Symptoms==
	The symptoms of 18p- can ~~be diverse~~ and ~~may~~ include:		The symptoms of 18p- can vary widely among affected individuals, depending on the size and location of the deletion. Common features include:

	* [[Developmental delay]] and intellectual disability		* [[Developmental delay]] and [[intellectual disability]]
	* Distinctive facial features, such as a flat nasal bridge, epicanthal folds~~, and a high-arched palate~~		* [[Hypotonia]] (low muscle tone)
	* [[Cebocephaly]], a condition characterized by a single nostril and closely set eyes		* Distinctive facial features, such as a flat nasal bridge and epicanthal folds
	* [[Hearing loss]]		* [[Hearing loss]]
	* [[Growth retardation]]		* [[Growth retardation]]
	* [[~~Hypotonia~~]] ~~(low muscle tone)~~		* [[Cebocephaly]], a rare craniofacial anomaly
	* [[Congenital heart defects]]

	~~The presence and severity of these symptoms can vary significantly among individuals with 18p-.~~

	==Diagnosis==		==Diagnosis==
	Diagnosis of 18p- is typically made through genetic testing~~. [[Karyotyping~~]] ~~can reveal the deletion of the p arm of chromosome 18. More precise techniques~~, such as [[~~fluorescence in situ hybridization~~]] ~~(FISH)~~ or [[chromosomal microarray analysis]], can ~~be used to~~ determine ~~the exact~~ size and ~~location of~~ the ~~deletion~~.		Diagnosis of 18p- is typically made through [[genetic testing]], such as [[karyotyping]] or [[chromosomal microarray analysis]]. These tests can identify the deletion on chromosome 18 and help determine its size and the specific genes involved.

	==Management==		==Management==
	There is no cure for 18p-, but management ~~of the condition~~ focuses on addressing the ~~specific~~ symptoms and improving ~~the~~ quality of life ~~for affected individuals~~. This may include:		There is no cure for 18p-, but management focuses on addressing the symptoms and improving quality of life. This may include:

	* Early intervention programs to address developmental delays		* [[Early intervention]] programs to address developmental delays
	* ~~Special education services~~		* [[Speech therapy]], [[occupational therapy]], and [[physical therapy]]
	* Speech, occupational, and physical therapy		* Regular monitoring of growth and development
	* Regular monitoring and ~~treatment of associated medical conditions, such as heart defects or hearing loss~~		* Hearing assessments and interventions if necessary

	==Prognosis==		==Prognosis==
	The prognosis for individuals with 18p- varies depending on the ~~size~~ of the ~~deletion~~ and the ~~severity~~ of ~~the symptoms~~. With appropriate ~~medical care~~ and ~~support~~, many individuals ~~with 18p-~~ can lead fulfilling lives.		The prognosis for individuals with 18p- varies depending on the severity of the symptoms and the presence of any associated health issues. With appropriate support and interventions, many individuals can lead fulfilling lives.

	==Related pages==		==Related pages==

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2025-03-04T21:26:25Z

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{{Short description|Genetic disorder involving deletion of part of chromosome 18}}
{{Use dmy dates|date=October 2023}}

'''18p-''' is a [[genetic disorder]] caused by the deletion of all or part of the short arm (p arm) of [[chromosome 18]]. This condition is part of a group of chromosomal deletion syndromes that can lead to a variety of developmental and physical abnormalities. The severity and specific symptoms of 18p- can vary widely among affected individuals.

==Genetics==
[[File:Cebocephaly_(2).png|Cebocephaly, a possible feature of 18p-|thumb|right]]
The human genome consists of 23 pairs of [[chromosomes]], each containing a long arm (q arm) and a short arm (p arm). In individuals with 18p-, there is a deletion of genetic material from the p arm of chromosome 18. The size of the deletion can vary, and this variation can influence the severity of the symptoms.

The deletion can occur de novo, meaning it is a new mutation that occurs during the formation of reproductive cells or in early fetal development. In some cases, the deletion may be inherited from a parent who carries a balanced translocation involving chromosome 18.

==Symptoms==
The symptoms of 18p- can be diverse and may include:

* [[Developmental delay]] and intellectual disability
* Distinctive facial features, such as a flat nasal bridge, epicanthal folds, and a high-arched palate
* [[Cebocephaly]], a condition characterized by a single nostril and closely set eyes
* [[Hearing loss]]
* [[Growth retardation]]
* [[Hypotonia]] (low muscle tone)
* [[Congenital heart defects]]

The presence and severity of these symptoms can vary significantly among individuals with 18p-.

==Diagnosis==
Diagnosis of 18p- is typically made through genetic testing. [[Karyotyping]] can reveal the deletion of the p arm of chromosome 18. More precise techniques, such as [[fluorescence in situ hybridization]] (FISH) or [[chromosomal microarray analysis]], can be used to determine the exact size and location of the deletion.

==Management==
There is no cure for 18p-, but management of the condition focuses on addressing the specific symptoms and improving the quality of life for affected individuals. This may include:

* Early intervention programs to address developmental delays
* Special education services
* Speech, occupational, and physical therapy
* Regular monitoring and treatment of associated medical conditions, such as heart defects or hearing loss

==Prognosis==
The prognosis for individuals with 18p- varies depending on the size of the deletion and the severity of the symptoms. With appropriate medical care and support, many individuals with 18p- can lead fulfilling lives.

==Related pages==
* [[Chromosomal deletion syndrome]]
* [[Chromosome 18]]
* [[Genetic disorder]]

[[Category:Genetic disorders]]
[[Category:Chromosomal abnormalities]]

18p- - Revision history

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