Trends in Genetics
Volume 31, Issue 10, October 2015, Pages 564-575
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Review
Special Issue: Human Genetics
Accessing Genetic Information with Liquid Biopsies

https://doi.org/10.1016/j.tig.2015.06.001Get rights and content

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There will be huge efforts from both academia and industry to develop ultrasensitive and specific methods, including technology platforms, assays, and data analysis tools for (i) circulating cell isolation, manipulation and characterization/analysis, and (ii) circulating nucleic acids analysis.

There will be large-scale, well-designed clinical trials to demonstrate the clinical utility of ctDNA/CTC for disease detection and monitoring.

There will be continued efforts to integrate knowledge from liquid biopsies into our understanding of health and disease conditions.

Non-invasive, liquid biopsy-based diagnostics will be rapidly incorporated into standard healthcare practice and become the central piece in the future precision medicine.

Recent scientific advances in understanding circulating tumor cells, cell-free DNA/RNA, and exosomes in blood have laid a solid foundation for the development of routine molecular ‘liquid biopsies’. This approach provides non-invasive access to genetic information – somatic mutations, epigenetic changes, and differential expression – about the physiological conditions of our body and diseases. It opens a valuable avenue for future genetic studies and human disease diagnosis, including prenatal and neurodegenerative disease diagnosis, as well as for cancer screening and monitoring. With the rapid development of highly sensitive and accurate technologies such as next-generation sequencing, molecular ‘liquid biopsies’ will quickly become a central piece in the future of precision medicine.

Section snippets

Blood-Based Sources for Future Molecular Diagnosis

Human blood contains rich genetic information which can greatly facilitate accurate diagnosis of a variety of diseases. Genomic DNA derived from leukocytes has long been used as the gold standard for molecular diagnosis of germline genetic diseases. However, there are additional forms of genetic material, albeit in extremely low quantities, within the blood, including DNA/RNA derived from circulating tumor cells (CTCs) and cell-free nucleic acids (cfNAs: cfDNA/cfRNA/circulating miRNA) (Box 1) 1

Technologies and Approaches to Analyze CTCs and cfNAs

Several types of genetic information, including somatic mutations, epigenetic modifications, and mRNA/miRNA differential expression, are currently being pursued as biomarkers for cancer and prenatal diagnosis. In particular, cancer-specific somatic mutations have received the most attention.

Concluding Remarks and Future Perspectives

In combination with NGS, liquid biopsies are quickly moving into the clinic, creating a new sphere of molecular diagnostics in areas including prenatal health, oncology, organ transplantation, and neurodegenerative disease 1, 18, 29, 56, 57. Reflective of its rapid development and tremendous potential impact, it was recently selected as one of the top 10 technology breakthroughs in 2015 by MIT Technology Review.

NIPT is the first and, arguably, most-successful clinical adoption of the liquid

Glossary

Companion diagnostics
in vitro diagnostics that provide information essential for the safe and effective use of a corresponding drug or biological product, such as cancer-targeted therapy drugs.
CpG island
in eukaryotic genomes, regions of several hundred bp that are enriched with CpG dinucleotides. They often overlap with transcription start-sites and can regulate gene expression via their differential methylation states [67].
DNA methylation
addition of a methyl group to cytosine residues at the

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