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Mizuko Osanai-Futahashi1, Takahiro Ohde, Junya Hirata

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Researchers developed a novel insect transgenesis marker using melanin pigment color changes. This visible marker, unlike fluorescence, aids genetic modification in silkworms and other insects like fruit flies.

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Area of Science:

  • Genetics and Molecular Biology
  • Developmental Biology
  • Entomology

Background:

  • Current insect transgenesis heavily relies on fluorescence markers, which can be limiting.
  • Melanin pigments are widespread across animal taxa, offering a potential basis for a universal marker system.

Purpose of the Study:

  • To establish a novel, non-fluorescent transformation marker system for insect transgenesis.
  • To utilize visible color changes in melanin pigments for genetic modification tracking.

Main Methods:

  • Overexpression of arylalkylamine-N-acetyl transferase (AANAT) in silkworm (Bombyx mori) using a baculovirus immediate early 1 gene promoter.
  • Analysis of pigmentation changes in larvae and adult stages.
  • Ectopic expression of AANAT in other insect species, including Harmonia axyridis and Drosophila melanogaster.

Main Results:

  • Ubiquitous AANAT overexpression in Bombyx mori resulted in a visible color shift from black to light brown in first-instar larvae.
  • This pigmentation change persisted throughout larval and adult stages.
  • Ectopic AANAT expression also lightened coloration in ladybird beetles and fruit flies, demonstrating broad applicability.

Conclusions:

  • A novel, visible transformation marker system based on melanin pigment modification has been successfully established.
  • This system offers a valuable alternative to fluorescence markers for transgenesis in diverse insect species.
  • The marker's effectiveness across different taxa highlights its potential for wider application in entomological research.