Microdeletion syndrome: Difference between revisions

Latest revision as of 14:19, 21 February 2025

Microdeletion Syndrome[edit]

Microdeletion syndrome refers to a group of genetic disorders caused by the deletion of a small segment of a chromosome. These deletions are typically too small to be detected by conventional karyotyping and often require more sensitive techniques such as fluorescence in situ hybridization (FISH) or comparative genomic hybridization (CGH) for diagnosis.

Characteristics[edit]

Microdeletion syndromes can result in a wide range of clinical features, depending on the specific genes that are deleted. Common characteristics may include developmental delays, intellectual disabilities, distinctive facial features, and congenital anomalies. The severity and specific symptoms can vary widely even among individuals with the same microdeletion.

Common Microdeletion Syndromes[edit]

22q11.2 Deletion Syndrome[edit]

The 22q11.2 deletion syndrome, also known as DiGeorge syndrome or velocardiofacial syndrome, is one of the most common microdeletion syndromes. It is caused by the deletion of a small segment of chromosome 22 and can lead to heart defects, immune deficiencies, and characteristic facial features.

Williams Syndrome[edit]

Williams syndrome is caused by a deletion on chromosome 7q11.23. It is characterized by cardiovascular disease, distinctive facial features, and a unique cognitive profile with strengths in verbal short-term memory and language.

Prader-Willi Syndrome[edit]

Prader-Willi syndrome is associated with a deletion on chromosome 15q11-q13. It is characterized by hypotonia, obesity, intellectual disability, and hypogonadism.

Angelman Syndrome[edit]

Angelman syndrome results from a deletion on chromosome 15q11-q13, similar to Prader-Willi syndrome, but involves different genes. It is characterized by severe intellectual disability, lack of speech, and a happy demeanor.

Diagnosis[edit]

Diagnosis of microdeletion syndromes often involves genetic testing techniques such as FISH, CGH, or next-generation sequencing. These tests can identify the specific chromosomal deletions responsible for the syndrome.

Management[edit]

Management of microdeletion syndromes is typically multidisciplinary, involving specialists in genetics, cardiology, neurology, and other fields as needed. Treatment focuses on addressing the specific symptoms and complications associated with the syndrome.

Related Pages[edit]

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-{{Short description|A genetic disorder caused by the deletion of a small chromosomal segment}}
+== Microdeletion Syndrome ==
-'''Microdeletion syndrome''' is a genetic disorder characterized by the deletion of a small segment of a chromosome. These deletions can lead to a variety of developmental and physical abnormalities, depending on the specific genes that are lost. Microdeletion syndromes are often identified through genetic testing, such as [[fluorescence in situ hybridization]] (FISH) or [[comparative genomic hybridization]] (CGH).
+[[File:Jedyne_w_Polsce_bliźniaki_z_zespołem_mikrodelecji_22q11.jpg|thumb|right|Children with 22q11.2 microdeletion syndrome]]
-==Overview==
+'''Microdeletion syndrome''' refers to a group of genetic disorders caused by the deletion of a small segment of a chromosome. These deletions are typically too small to be detected by conventional [[karyotyping]] and often require more sensitive techniques such as [[fluorescence in situ hybridization]] (FISH) or [[comparative genomic hybridization]] (CGH) for diagnosis.
-Microdeletion syndromes are a subset of [[chromosomal deletion]] syndromes, where a small part of a chromosome is missing. These deletions can occur on any chromosome and can vary in size. The loss of genetic material can disrupt the function of multiple genes, leading to a range of clinical features.
-==Common Microdeletion Syndromes==
+== Characteristics ==
-Several well-known microdeletion syndromes have been identified, each associated with specific clinical features:
+Microdeletion syndromes can result in a wide range of clinical features, depending on the specific genes that are deleted. Common characteristics may include developmental delays, intellectual disabilities, distinctive facial features, and congenital anomalies. The severity and specific symptoms can vary widely even among individuals with the same microdeletion.
-===22q11.2 Deletion Syndrome===
+== Common Microdeletion Syndromes ==
-[[22q11.2 deletion syndrome]], also known as DiGeorge syndrome or velocardiofacial syndrome, is one of the most common microdeletion syndromes. It is caused by the deletion of a small segment on chromosome 22. Clinical features can include congenital heart defects, cleft palate, immune deficiencies, and developmental delays.
-===Williams Syndrome===
+=== 22q11.2 Deletion Syndrome ===
-[[Williams syndrome]] is caused by a deletion on chromosome 7. It is characterized by distinctive facial features, cardiovascular problems, and developmental delays. Individuals with Williams syndrome often have a unique cognitive profile, with strengths in verbal abilities and weaknesses in visuospatial tasks.
+The 22q11.2 deletion syndrome, also known as [[DiGeorge syndrome]] or velocardiofacial syndrome, is one of the most common microdeletion syndromes. It is caused by the deletion of a small segment of chromosome 22 and can lead to heart defects, immune deficiencies, and characteristic facial features.
-===Prader-Willi Syndrome===
+=== Williams Syndrome ===
-[[Prader-Willi syndrome]] results from a deletion on chromosome 15. It is associated with hypotonia, obesity, intellectual disability, and endocrine abnormalities. The syndrome is caused by the loss of paternal genes in the 15q11-q13 region.
+[[Williams syndrome]] is caused by a deletion on chromosome 7q11.23. It is characterized by cardiovascular disease, distinctive facial features, and a unique cognitive profile with strengths in verbal short-term memory and language.
-===Angelman Syndrome===
+=== Prader-Willi Syndrome ===
-[[Angelman syndrome]] is caused by a deletion on the maternal chromosome 15, in the same region as Prader-Willi syndrome. It is characterized by severe intellectual disability, lack of speech, seizures, and a happy demeanor.
+[[Prader-Willi syndrome]] is associated with a deletion on chromosome 15q11-q13. It is characterized by hypotonia, obesity, intellectual disability, and hypogonadism.
-==Diagnosis==
+=== Angelman Syndrome ===
-Microdeletion syndromes are typically diagnosed using genetic testing techniques. [[Fluorescence in situ hybridization]] (FISH) can be used to detect specific deletions, while [[comparative genomic hybridization]] (CGH) allows for the detection of larger deletions across the genome. [[Next-generation sequencing]] (NGS) is also increasingly used to identify microdeletions.
+[[Angelman syndrome]] results from a deletion on chromosome 15q11-q13, similar to Prader-Willi syndrome, but involves different genes. It is characterized by severe intellectual disability, lack of speech, and a happy demeanor.
-==Management==
+== Diagnosis ==
-Management of microdeletion syndromes is often multidisciplinary, involving specialists in genetics, cardiology, neurology, and developmental pediatrics. Treatment is symptomatic and supportive, focusing on addressing the specific medical and developmental needs of the individual.
+Diagnosis of microdeletion syndromes often involves genetic testing techniques such as FISH, CGH, or [[next-generation sequencing]]. These tests can identify the specific chromosomal deletions responsible for the syndrome.
-==Images==
+== Management ==
-[[File:Chromosome_deletion.png|thumb|right|Diagram of a chromosomal deletion.]]
+Management of microdeletion syndromes is typically multidisciplinary, involving specialists in genetics, cardiology, neurology, and other fields as needed. Treatment focuses on addressing the specific symptoms and complications associated with the syndrome.
-==Related pages==
+== Related Pages ==
 * [[Chromosomal deletion]]
 * [[Genetic disorder]]