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Highly Efficient Knockout of a Squid Pigmentation Gene.

Karen Crawford1, Juan F Diaz Quiroz2, Kristen M Koenig3

  • 1Biology Department, St. Mary's College of Maryland, 18952 E. Fisher Road, St. Mary's City, MD 20650, USA; The Eugene Bell Center, The Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA 02543, USA.

Current Biology : CB
|August 1, 2020
PubMed
Summary

Researchers successfully used CRISPR-Cas9 gene editing to create pigment-free squid embryos. This breakthrough in genetic manipulation paves the way for advanced studies in cephalopod biology and behavior.

Keywords:
CRISPR-Cas9Doryteuthis pealeiiTDOTryptophan 2,3 dioxygenasecephalopodschromatophoresommochromessquid

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Area of Science:

  • Neurobiology and Genetics
  • Cephalopod Research

Background:

  • Squid models historically advanced neurobiology (action potential, ion channels, synaptic transmission).
  • Use of squid declined due to lack of genetic tractability.
  • Recent advances include CRISPR-Cas9 and cephalopod genome sequencing.

Purpose of the Study:

  • To demonstrate efficient gene knockout in the squid Doryteuthis pealeii using CRISPR-Cas9.
  • To establish genetic tractability in squid for future biological discoveries.
  • To explore the role of Tryptophan 2,3 Dioxygenase (TDO) in pigment synthesis.

Main Methods:

  • Utilized CRISPR-Cas9 gene editing technology for targeted gene disruption.
  • Focused on knocking out the Tryptophan 2,3 Dioxygenase (TDO) gene.
  • Administered CRISPR-Cas9 during early embryonic development for precise control.

Main Results:

  • Achieved efficient gene knockout of TDO in Doryteuthis pealeii embryos.
  • Successfully eliminated pigmentation in knockout squid embryos.
  • Demonstrated knockout efficiencies routinely exceeding 90% via genotyping.
  • Showcased precise control over pigmentation levels by timing gene editing.

Conclusions:

  • This study establishes CRISPR-Cas9 as an effective tool for genetic manipulation in squid.
  • Efficient gene knockout advances squid as a genetically tractable model organism.
  • Opens new avenues for studying complex behaviors and biological novelties in cephalopods.