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Exon Recombination02:32

Exon Recombination

The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes. 
Exon shuffling follows “splice frame rules.” Each exon has three reading...

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Related Experiment Video

Updated: Jul 6, 2026

In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila
06:41

In Vivo Functional Study of Disease-associated Rare Human Variants Using Drosophila

Published on: August 20, 2019

Cellular studies of MrDb (DDX18).

Sandy Dubaele1, Patrick Chène

  • 1Druggability-Enzymology-Profiling Unit, Oncology Research, Novartis Institutes for BioMedical Research, CH-4002 Basel, Switzerland.

Oncology Research
|March 21, 2008
PubMed
Summary

This study reveals that the DEAD-box RNA helicase, MrDb (DDX18), is crucial for tumor cell proliferation. Inhibiting MrDb significantly reduces tumor growth without causing cell cycle arrest or apoptosis, suggesting a novel therapeutic target.

Area of Science:

  • Molecular Biology
  • Oncology
  • Virology

Background:

  • Helicases are essential enzymes found across all domains of life, including viruses, prokaryotes, and eukaryotes.
  • Several helicases have been implicated in human diseases, highlighting their critical roles in cellular processes.

Purpose of the Study:

  • To investigate the function of the DEAD-box RNA helicase, MrDb (DDX18), in tumor cells.
  • To determine the potential of MrDb as a therapeutic target for cancer treatment.

Main Methods:

  • Utilized dominant-negative mutants and short hairpin RNA (shRNA) to inhibit MrDb expression in tumor cells.
  • Assessed the impact of MrDb inhibition on tumor cell proliferation, cell cycle progression, and apoptosis.

Main Results:

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  • MrDb was identified as a nucleolar protein ubiquitously expressed in tumor cells.
  • MrDb expression levels were found to be higher in proliferating cells.
  • Inhibition of MrDb led to a reduction in tumor cell proliferation without inducing cell cycle arrest or apoptosis.

Conclusions:

  • MrDb plays a significant role in promoting tumor cell proliferation.
  • Targeting MrDb could be a viable strategy to inhibit tumor growth in cancer therapy.