Circulating DNA, a Potentially Sensitive and Specific Diagnostic Tool for Future Medicine

Area of Science:

• Biochemistry
• Molecular Biology
• Genetics

Background:

• Liquid biopsy, using cell-free DNA (cfDNA), offers potential for early disease detection.
• Circulating tumor DNA (ctDNA) can indicate cancer origin but faces challenges due to heterogeneity.
• Fetal cfDNA is established for prenatal screening of aneuploidies.

Purpose of the Study:

• To review the discovery and development of tumor and fetal cfDNA.
• To discuss sample handling, cfDNA purification methods, and analysis technologies.
• To explore the future prospects of cfDNA in diagnostics.

Main Methods:

• Literature review of cfDNA research.
• Comparison of cfDNA purification protocols (classic vs. commercial kits).
• Summary and discussion of cfDNA analysis technologies, including recent advancements.

Main Results:

• cfDNA analysis is valuable for early disease screening, especially in oncology and pregnancy.
• Standardization of sample collection, transport, and preservation is crucial.
• Various cfDNA purification and analysis techniques have been developed and refined.

Conclusions:

• Despite current limitations, cfDNA is a promising tool for point-of-care diagnostics.
• Further research and development are needed for widespread clinical adoption.
• cfDNA applications extend beyond early diagnosis to broader healthcare benefits.