Scientists Engineer Fruit Flies to Express Plastic-Degrading Enzymes
Researchers have genetically engineered Drosophila melanogaster fruit flies to express two enzymes capable of breaking down polyethylene terephthalate (PET) plastic. The study used evolved variants of IsPETase and leaf-branch compost cutinase (LCC), which were successfully secreted by both fly cells and transgenic larvae in functional form. The findings suggest insects could one day serve as biological platforms for processing plastic-contaminated organic waste that current recycling systems fail to capture.
A team of researchers has demonstrated that the common fruit fly, Drosophila melanogaster, can be engineered to synthesize and secrete functional PET-degrading enzymes, representing a novel approach to plastic bioconversion. The study introduced in vitro-evolved variants of two enzymes — Ideonella sakaiensis PETase and leaf-branch compost cutinase (LCC) — fused to secretory signals, enabling their production in both cultured Drosophila cells and living transgenic larvae. Crucially, the TA-ΔLCC variant demonstrated the ability to depolymerize PET nanoparticles in vitro using crude larval extracts under optimal conditions. Importantly, the genetically modified flies showed no apparent adverse effects, maintaining normal development, fertility, and gut morphology and function. The researchers frame this as a proof-of-concept platform for comparing enzyme performance within an insect host, rather than an immediately deployable recycling solution. The work addresses the challenge of plastic contamination in organic municipal waste streams, which frequently bypasses conventional recycling infrastructure. The authors suggest this approach could contribute to broader strategies for plastic waste mitigation through biological systems.
What's missing
The study tests PET degradation using nanoparticles under optimized in vitro conditions rather than bulk PET plastic under realistic waste-processing environments, leaving open questions about scalability and real-world efficacy. The paper does not address the efficiency or rate of PET degradation relative to existing enzymatic or industrial recycling methods, nor does it discuss potential ecological risks of releasing transgenic insects. Long-term stability of enzyme expression across fly generations is also not reported.
What different sources said
- bioRxivCenter
Drosophila melanogaster as a platform for the functional expression of engineered PET-degrading enzymes
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