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Fixing Double-strand Breaks02:04

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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
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Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
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Lagging Strand Synthesis01:59

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During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
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In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA...
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Guidelines for Experiments Using Antisense Oligonucleotides and Double-Stranded RNAs.

Keith T Gagnon1,2, David R Corey3

  • 11 Department of Biochemistry and Molecular Biology, School of Medicine, Southern Illinois University, Carbondale, Illinois.

Nucleic Acid Therapeutics
|March 26, 2019
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Summary
This summary is machine-generated.

Synthetic nucleic acids show promise as therapeutics, but inadequate experimental designs hinder progress. Establishing minimum control experiments is crucial for validating results and advancing the field of synthetic oligonucleotide research.

Keywords:
antisense oligonucleotidecontrolsduplex RNAguidelines

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Area of Science:

  • Molecular Biology
  • Drug Development
  • Biotechnology

Background:

  • Synthetic nucleic acids are increasingly successful in clinical applications.
  • Research focuses on modulating messenger RNA and noncoding RNAs using synthetic nucleic acids.
  • Inadequate experimental designs lead to misinterpreted data and wasted resources.

Purpose of the Study:

  • To identify common problems in synthetic nucleic acid research, particularly for new investigators.
  • To outline essential control experiments for validating molecular interactions.
  • To promote standardized practices for experimental design and data interpretation.

Main Methods:

  • Review of common experimental design flaws in synthetic nucleic acid research.
  • Proposal of a minimum set of control experiments.
  • Discussion of standards for data interpretation and publication.

Main Results:

  • Experimental designs often lack sufficient controls, leading to unreliable conclusions.
  • Specific control experiments are necessary to confirm on-target effects.
  • Standardization can improve the quality and impact of research in this field.

Conclusions:

  • Improved experimental rigor is essential for the advancement of synthetic nucleic acid therapeutics and tools.
  • Implementing standardized control experiments will enhance data reliability and research reproducibility.
  • Adoption of common standards will accelerate the development and clinical translation of synthetic nucleic acid-based drugs.