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Responses of gut microbiomes to commercial polyester polymer biodegradation in Tenebrio molitor Larvae
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Researchers demonstrated that mealworms (Tenebrio molitor) can rapidly biodegrade commercial polyethylene terephthalate microplastics, with gut microbiome analysis revealing specific bacterial communities that shift in response to PET consumption and enable its breakdown.
Polyethylene terephthalate (PET) is a mass-produced fossil-based plastic polymer that contributes to catastrophic levels of plastic pollution. Here we demonstrated that Tenebrio molitor (mealworms) was capable of rapidly biodegrading two commercial PET resins (microplastics) with respective weight-average molecular weight (M) of 39.33 and 29.43 kDa and crystallinity of 22.8 ± 3.06% and 18 ± 2.25%, resulting in an average mass reduction of 71.03% and 73.28% after passage of their digestive tract, and respective decrease by 9.22% and 11.36% in M of residual PET polymer in egested frass. Sequencing of 16 S rRNA gene amplicons of gut microbial communities showed that dominant bacterial genera were enriched and associated with PET degradation. Also, PICRUSt prediction exhibited that oxidases (monooxygenases and dioxygenases), hydrolases (cutinase, carboxylesterase and chitinase), and PET metabolic enzymes, and chemotaxis related functions were up-regulated in the PET-fed larvae. Additionally, metabolite analyses revealed that PET uptake caused alterations of stress response and plastic degradation related pathways, and lipid metabolism pathways in the T. molitor larvae could be reprogrammed when the larvae fed on PET. This study provides new insights into gut microbial community adaptation to PET diet under nutritional stress (especially nitrogen deficiency) and its contribution to PET degradation.
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Plastic Degradation Potential and Metagenomic Analysis of an Enriched Gut Microbial Consortium from Tenebrio molitor
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Scientists found that bacteria living in the gut of mealworms (a type of beetle larvae) can break down several common plastics, including polystyrene, polyethylene, and PET — the materials used in everything from food containers to water bottles. This matters because plastic pollution, including the microplastics increasingly found in our food, water, and even our bodies, is a growing health concern, and these gut bacteria could offer clues for developing eco-friendly ways to break down plastic waste before it fragments into the tiny particles we end up consuming. The research is still early-stage — the genes and pathways were identified in the lab, so real-world plastic c
Biodegradation of various grades of polyethylene microplastics by Tenebrio molitor and Tenebrio obscurus larvae: Effects on their physiology
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Mealworm larvae (Tenebrio molitor and Tenebrio obscurus) were fed different grades of polyethylene plastic to test their ability to biodegrade this common plastic. Both species could consume and partially break down all three types of polyethylene, though the process caused oxidative stress and shifted their gut bacteria. This research suggests biological degradation of plastic waste is possible, which could help reduce the environmental breakdown of plastics into harmful microplastics.
Isolation of Plastic Digesting Microbes from the Gastrointestinal Tract of Tenebrio Molitor
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Researchers isolated bacteria from the gut of Tenebrio molitor mealworm larvae that are capable of degrading polystyrene and polyethylene microplastics. The identified gut microbes showed plastic-degrading enzymatic activity, suggesting potential for bioremediation applications.
Gut microbiome of mealworms (Tenebrio molitor Larvae) show similar responses to polystyrene and corn straw diets
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Researchers compared the gut microbiomes of mealworms fed polystyrene plastic versus corn straw and found strikingly similar microbial community responses to both diets. The findings suggest that the ability of mealworm larvae to break down plastics likely evolved from ancient biological mechanisms originally designed to digest natural plant fibers like lignocellulose. The study points to mealworm gut bacteria as a potential resource for developing biological plastic degradation strategies.
Gut Microbiome and Degradation Product Formation during Biodegradation of Expanded Polystyrene by Mealworm Larvae under Different Feeding Strategies
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Researchers found that mealworm larvae successfully degrade polystyrene under different feeding strategies, with gut microbiome composition and degradation byproduct profiles varying by diet, demonstrating that diet manipulation can optimize the biological plastic-degradation capacity of the mealworm system.
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