Cell-free DNA: Comparison of Technologies

Area of Science:

• Prenatal diagnostics
• Genetics
• Molecular biology

Background:

• Cell-free fetal DNA (cfDNA) screening for Down syndrome has seen rapid adoption.
• Traditional first-trimester screening methods are being increasingly replaced by cfDNA tests.

Purpose of the Study:

• To review and compare the main laboratory methodologies for cfDNA screening.
• To assess the performance of different cfDNA screening technologies for trisomy 21.
• To discuss the potential of these technologies for broader applications.

Main Methods:

• Massive parallel shotgun sequencing (MPSS)
• Targeted massive parallel sequencing (t-MPS)
• Single nucleotide polymorphism (SNP) based approaches

Main Results:

• All three main cfDNA screening technologies demonstrated comparable performance.
• These methods were superior to traditional first-trimester screening for trisomy 21 detection.
• Performance differences were mainly observed for chromosomal anomalies other than trisomy 21.

Conclusions:

• Understanding the benefits and limitations of each cfDNA technology is crucial for patient counseling.
• cfDNA screening technologies hold significant potential beyond common aneuploidy screening.
• Further research into investigational technologies is warranted.