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Nucleic Acids02:43

Nucleic Acids

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Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and carry instructions for its functioning.
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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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Nucleic Acids and Nucleotides01:20

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Nucleic acids are the most important macromolecules for the continuity of life. They carry the cell's genetic blueprint and have instructions for its functioning. The two main types of nucleic acids are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA).
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Evaluation of Polymeric Gene Delivery Nanoparticles by Nanoparticle Tracking Analysis and High-throughput Flow Cytometry
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Polymers for nucleic acid transfer-an overview.

Ernst Wagner1

  • 1Pharmaceutical Biotechnology, Department of Pharmacy, Ludwig-Maximilians-University Munich, and Nanosystems Initiative Munich (NIM), Munich, Germany.

Advances in Genetics
|November 21, 2014
PubMed
Summary
This summary is machine-generated.

Cationic polymers facilitate nucleic acid delivery, evolving into advanced polyplexes for targeted gene therapy. Challenges remain in nuclear delivery and demonstrating medical efficacy for diverse nucleic acid therapeutics.

Keywords:
Cationic polymersGene transferReceptor targetingpDNAsiRNA

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Area of Science:

  • Biomaterials Science
  • Gene Therapy
  • Nanotechnology

Background:

  • Cationic polymers have been instrumental in nucleic acid transfection for five decades.
  • Advancements in polymer chemistry and understanding biological barriers have driven innovation in polyplex development.

Purpose of the Study:

  • To review the evolution of cationic polymers and polyplexes for nucleic acid delivery.
  • To highlight breakthroughs in nanoparticle design, targeting, and intracellular delivery.
  • To discuss persistent challenges and future directions in gene therapy vector development.

Main Methods:

  • Review of literature on polymer-nucleic acid interactions and polyplex formulation.
  • Analysis of developments in macromolecular chemistry and biological delivery hurdles.
  • Examination of second-generation polymer properties and therapeutic applications.

Main Results:

  • Development of polycations for stable polyplex nanoparticles.
  • Incorporation of targeting ligands and shielding for receptor-mediated delivery.
  • Improved endosomal escape and intracellular transfer efficacy.
  • Emergence of dynamic polymers with pH-responsive and biodegradable features.

Conclusions:

  • Significant progress has been made in polyplex design for enhanced gene delivery.
  • Challenges in nuclear delivery and long-term gene expression persist.
  • Tailoring carriers for diverse nucleic acid payloads (mRNA, siRNA, microRNA) is crucial.
  • Bioinspired multifunctional polyplexes offer promise but require optimized design and reproducible preparation.