The utility of chromosomal microarray analysis in developmental and behavioral pediatrics

Area of Science:

• Genetics
• Developmental Biology

Background:

• Chromosomal microarray analysis (CMA) is increasingly utilized for diagnosing developmental disabilities.
• Genomic abnormalities, including copy number variants (CNVs), are implicated in various neurodevelopmental disorders.

Purpose of the Study:

• To highlight the role of CMA in identifying genomic abnormalities in developmental disabilities.
• To compare CMA with traditional genetic testing methods.

Main Methods:

• CMA encompasses array comparative genomic hybridization (CGH) and single nucleotide polymorphism (SNP) arrays.
• These methods detect genomic copy number variants (CNVs), such as microdeletions and microduplications.

Main Results:

• CMA is highly effective in detecting disease-causing CNVs, particularly in children with moderate to severe intellectual disability (20%-25%).
• Disease-causing CNVs are identified in 5%-10% of autism cases, with higher prevalence in severe phenotypes.
• CMA has become the preferred first-tier genetic test for evaluating developmental and behavioral disabilities, superseding Giemsa-banded karyotype.

Conclusions:

• CMA is a powerful tool for diagnosing developmental disabilities by identifying genomic abnormalities.
• Its superior diagnostic yield makes it the recommended first-line genetic evaluation for affected children.