Oligonucleotide microarrays in constitutional genetic diagnosis

Area of Science:

• Genomics
• Molecular Biology
• Medical Genetics

Background:

• Oligonucleotide microarrays, including comparative genomic hybridization (CGH) and SNP arrays, offer high-resolution detection of copy-number variants (CNVs).
• These genomic imbalances are increasingly significant in both clinical diagnostics and biological research.

Purpose of the Study:

• To review the primary applications of high-throughput oligonucleotide microarrays in genetic diagnosis and research.
• To highlight the utility of these arrays in identifying genomic imbalances for various medical conditions.

Main Methods:

• Utilizing oligonucleotide microarrays (CGH arrays, SNP arrays) for high-throughput analysis.
• Applying these methods for genetic diagnosis in developmental disorders, autism spectrum disorders, congenital anomalies, and prenatal diagnosis.
• Employing microarrays in research for identifying disease-related genes and CNV associations with common diseases.

Main Results:

• Oligonucleotide microarrays are standard tools for diagnosing unexplained developmental delay/intellectual disability, autism spectrum disorders, and multiple congenital anomalies.
• Prenatal diagnosis benefits from microarray use to characterize rearrangements or detect cryptic imbalances in fetuses with abnormalities.
• Research applications include discovering genes for monogenic disorders and linking CNVs to common disease predisposition.

Conclusions:

• High-throughput oligonucleotide microarrays are powerful tools in genetic diagnostics and research, enabling precise identification of copy-number variants.
• Despite widespread application, interpreting microarray results can be complex, necessitating careful consideration of unexpected findings and ethical implications.