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A Strategy for Gene Knockdown in Dinoflagellates.

Miranda Judd1, Allen R Place1

  • 1Institute of Marine and Environmental Technologies, University of Maryland Center for Environmental Science, 701 E Pratt St., Baltimore, MD 21022, USA.

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|June 24, 2022
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Summary

Researchers developed a new method to inhibit gene expression in dinoflagellates using peptide-delivered morpholinos. This technique successfully reduced levels of the translation initiation factor eIF4E in Amphidinium carterae.

Keywords:
dinoflagellateknockdownmorpholinotranslation

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Area of Science:

  • * Molecular Biology
  • * Protistology
  • * Gene Regulation

Background:

  • * Dinoflagellates possess unique nuclear characteristics and regulate gene expression primarily at the translational level.
  • * The eukaryotic initiation factor 4E (eIF4E) is crucial for translation initiation, binding the mRNA 5' cap.
  • * Dinoflagellates have multiple eIF4E family members, necessitating methods to study their specific functions.

Purpose of the Study:

  • * To establish a method for targeted gene knockdown in dinoflagellates.
  • * To investigate the role of eIF4E family members in dinoflagellate gene expression.
  • * To develop a technique for delivering morpholinos into dinoflagellate cells.

Main Methods:

  • * Utilized peptide-based reagents for cell-penetrating delivery of fluorescently-tagged morpholinos into the cytosol of *Amphidinium carterae*.
  • * Designed morpholinos to target the eIF4e-1a sequence, aiming to inhibit translation.
  • * Verified knockdown efficiency using microscopy and Western blot analysis.

Main Results:

  • * Successfully delivered morpholinos into the cytosol of *Amphidinium carterae* without apparent cell membrane damage.
  • * Achieved specific knockdown of eIF4e-1a, with success rates up to 42%.
  • * Confirmed knockdown through visual microscopy and protein level analysis via Western blot.

Conclusions:

  • * Peptide-mediated morpholino delivery is an effective method for targeted translational inhibition in dinoflagellates.
  • * This approach enables functional studies of specific eIF4E family members in dinoflagellates.
  • * The developed technique opens new avenues for genetic manipulation in these unique protists.