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The Galleria mellonella Hologenome Supports Microbiota-Independent Metabolism of Long-Chain Hydrocarbon Beeswax
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This study assembled a high-quality genome of the greater wax moth Galleria mellonella to understand how it degrades wax and plastic molecules, identifying key enzymes and pathways involved in long-chain hydrocarbon metabolism. The findings advance knowledge of the genetic basis for plastic degradation by insects and may support biotechnological applications in plastic biodegradation.
The greater wax moth, Galleria mellonella, degrades wax and plastic molecules. Despite much interest, the genetic basis of these hallmark traits remains poorly understood. Herein, we assembled high-quality genome and transcriptome data from G. mellonella to investigate long-chain hydrocarbon wax metabolism strategies. Specific carboxylesterase and lipase and fatty-acid-metabolism-related enzymes in the G. mellonella genome are transcriptionally regulated during feeding on beeswax. Strikingly, G. mellonella lacking intestinal microbiota successfully decomposes long-chain fatty acids following wax metabolism, although the intestinal microbiome performs a supplementary role in short-chain fatty acid degradation. Notably, final wax derivatives were detected by gas chromatography even in the absence of gut microbiota. Our findings provide insight into wax moth adaptation and may assist in the development of unique wax-degradation strategies with a similar metabolic approach for a plastic molecule polyethylene biodegradation using organisms without intestinal microbiota.
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Improved reference quality genome sequence of the plastic-degrading greater wax moth, Galleria mellonella
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Researchers produced an improved reference genome for the greater wax moth (Galleria mellonella), a model organism used in microplastic and plastic-degradation research because its larvae can break down polyethylene. The improved assembly provides a genomic resource supporting genetic studies of plastic-degrading enzymes in this insect.
Beyond Microbial Biodegradation: Plastic Degradation by Galleria mellonella
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Researchers reviewed the ability of the wax moth larva Galleria mellonella to degrade various types of plastic, including polyethylene. The study highlights this insect as one of the most promising biological approaches to plastic waste degradation, as it produces enzymes capable of breaking down polyethylene, offering a potential complement to microbial biodegradation strategies.
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This study identified gut bacteria in the greater wax moth that can break down plastic materials, contributing to understanding of insect-associated microorganisms capable of plastic degradation. The findings add to growing evidence that insect gut microbiomes could be harnessed as biological tools for reducing plastic waste.
Complete digestion/biodegradation of polystyrene microplastics by greater wax moth (Galleria mellonella) larvae: Direct in vivo evidence, gut microbiota independence, and potential metabolic pathways
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Researchers provided direct in vivo evidence that greater wax moth larvae can completely digest polystyrene microplastics, demonstrating that biodegradation occurs independently of gut microbiota and identifying potential metabolic pathways involved in the breakdown process.
Transcriptomic analyses of labial glands and gut tissue from two wax moths, Achroia grisella and Galleria mellonella
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Researchers sequenced the genome of the lesser wax moth Achroia grisella and generated tissue-specific RNA expression data for both it and Galleria mellonella, identifying highly expressed secretory enzymes in gut and labial tissues — including three hexamerins and two monooxygenases — as candidate plastic-degrading enzymes, and finding sequence similarity to bacterial enzymes that break down polyethylene and polystyrene.
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