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A smart polymer for sequence-selective binding, pulldown, and release of DNA targets.

Elisha Krieg1,2,3,4,5, Krishna Gupta6,7, Andreas Dahl8

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Researchers developed a smart polymer (MeRPy) for selective DNA isolation. This polymer efficiently separates and releases DNA targets, enhancing next-generation sequencing data quality for clinical applications.

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Area of Science:

  • Biotechnology and Molecular Biology
  • Materials Science
  • Genomics and Bioinformatics

Background:

  • Selective isolation of DNA is essential for diverse applications, including molecular biology, clinical diagnostics, and forensics.
  • Existing DNA isolation methods may lack efficiency, specificity, or scalability for certain advanced applications like next-generation sequencing (NGS).

Purpose of the Study:

  • To develop and characterize a novel methanol-responsive polymer (MeRPy) for programmable DNA binding and separation.
  • To demonstrate the efficiency and selectivity of MeRPy in capturing and releasing DNA targets.
  • To evaluate the utility of MeRPy in improving the quality of clinical next-generation sequencing libraries.

Main Methods:

  • Design and synthesis of a smart methanol-responsive polymer (MeRPy).
  • Programming MeRPy for DNA target binding and release using denaturation (sequence-agnostic) and toehold-mediated strand displacement (sequence-selective) methods.
  • Application of MeRPy for depleting specific cDNA targets (insulin, glucagon, transthyretin) from clinical NGS libraries.

Main Results:

  • MeRPy demonstrated efficient binding and release of both single- and double-stranded DNA targets.
  • Sequence-selective release achieved 99.8% removal of unwanted sequences and 79% recovery of pure target DNA.
  • Depletion of specific cDNA using MeRPy significantly improved data quality for low-abundance transcripts in pancreatic tissue NGS expression profiles.

Conclusions:

  • MeRPy offers a versatile and efficient platform for selective DNA isolation with programmable control.
  • The polymer's low cost, scalability, stability, and ease of use make it suitable for various research and clinical laboratory applications.
  • MeRPy shows promise for enhancing NGS libraries, DNA extraction, preparative-scale DNA isolation, and sorting of DNA-labeled targets.