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Recombinant DNA technology called transgenesis is often used to add a foreign gene or remove a detrimental gene from an organism. Such genetically modified organisms are called transgenic organisms.
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An Anthocyanin-Based Visual Reporter System for Genetic Transformation and Genome Editing in Cassava.

Xing-Hou Zhen1, Ran-Ran Pan2, Xiao-Hua Lu1

  • 1National Key Laboratory for Tropical Crop Breeding, School of Life and Health Sciences, Hainan University, Haikou 570228, China.

International Journal of Molecular Sciences
|November 9, 2024
PubMed
Summary

Scientists developed a new visual marker system for cassava using a rubber tree gene. This system allows easy identification of genetically modified cassava plants by observing purple leaves, aiding in crop improvement.

Keywords:
cassava anthocyaninsgenetic transformationgenome editingvisual reporter

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Area of Science:

  • Plant Biotechnology
  • Molecular Biology
  • Agricultural Science

Background:

  • Cassava (Manihot esculenta) is a vital staple crop, but efficient genetic modification requires effective screening methods.
  • Current methods for identifying transgenic or gene-edited cassava can be inefficient or destructive.

Purpose of the Study:

  • To develop a visual selection marker system for identifying transgenic and gene-edited cassava plants.
  • To utilize an anthocyanin gene from rubber tree (Hevea brasiliensis) as a visual reporter.

Main Methods:

  • Introduced the R2R3-MYB transcription factor anthocyanin 1 gene (HbAN1) from rubber tree into cassava.
  • Employed an AR-CRISPR/Cas9-gRNA system with HbAN1 as a marker for gene editing.

Main Results:

  • Transgenic cassava lines expressing HbAN1 exhibited anthocyanin accumulation, resulting in visibly purple leaves.
  • Anthocyanin accumulation did not negatively impact cassava regeneration or transformation efficiency.
  • Successfully generated MeCDD4 gene-edited cassava mutants with purple leaves using the HbAN1 marker system.

Conclusions:

  • The developed anthocyanin-based visual reporter (AR) system provides an efficient and non-destructive method for screening transgenic cassava.
  • This system is effective for both genetic transformation and genome editing applications in cassava, facilitating crop improvement.