Potentials and challenges of chromosomal microarray analysis in prenatal diagnosis

Area of Science:

• Genetics
• Prenatal Diagnosis
• Genomic Medicine

Background:

• Conventional karyotyping was the standard for prenatal genetic testing.
• Molecular cytogenetics, particularly CMA, has advanced prenatal diagnosis.
• CMA is a high-resolution, genome-wide method recommended for fetuses with structural abnormalities.

Purpose of the Study:

• To review the current applications of CMA in prenatal diagnosis.
• To discuss challenges CMA faces with emerging genome sequencing technologies.
• To compare CMA with newer techniques like copy number variation sequencing and whole exome sequencing.

Main Methods:

• Literature review of primary research on CMA for prenatal diagnosis.
• Analysis of the impact of genome sequencing on CMA's role.
• Comparative assessment of CMA and next-generation sequencing methods.

Main Results:

• CMA remains the preferred first-tier test for prenatal diagnosis currently.
• Emerging technologies like genome sequencing present challenges to CMA's dominance.
• Genome sequencing offers broader detection capabilities, including single-nucleotide variations.

Conclusions:

• CMA is still the suggested priority testing methodology in the prenatal setting.
• Pregnant women may soon benefit from genome sequencing for comprehensive genetic analysis.
• Future prenatal testing may integrate copy number variations, homozygosity, and single-nucleotide variations detection.