Microdeletion syndrome

Microdeletion syndrome is a genetic condition that results from the deletion of several genes on a chromosome. This condition is also known as a chromosomal deletion or a partial monosomy.

Overview

Microdeletion syndromes are caused by submicroscopic deletions in the DNA sequence that are too small to be detected by conventional cytogenetic methods. These deletions can occur in any part of the genome and can affect any number of genes. The clinical manifestations of microdeletion syndromes are highly variable and depend on the specific genes that are deleted.

Causes

Microdeletion syndromes are typically caused by non-allelic homologous recombination (NAHR) during meiosis. NAHR is a type of genetic recombination that occurs between two sequences of DNA that are similar but not identical. This can lead to the deletion of the DNA sequence between the two homologous sequences.

Diagnosis

Diagnosis of microdeletion syndromes is typically made through genetic testing. This can include karyotyping, fluorescence in situ hybridization (FISH), and comparative genomic hybridization (CGH). More recently, next-generation sequencing (NGS) technologies have been used to diagnose microdeletion syndromes.

Treatment

There is currently no cure for microdeletion syndromes. Treatment is typically supportive and focuses on managing the symptoms of the condition. This can include physical therapy, occupational therapy, speech therapy, and educational support. In some cases, medication may be used to manage specific symptoms.

See also

• Genetic disorder
• Chromosome abnormality
• Genomic disorder
• Copy-number variation

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