Superworm beetle shell-hardening gene proves critical for growth and survival
Cheng Y, Liang X, Dai H, Liu Y, Zhang J
Crispr
Superworms are a go-to composting insect for breaking down kitchen scraps into garden castings, and understanding what governs their development could help hobbyist worm-bin keepers maintain healthier, more productive colonies.
When a beetle sheds its skin, a group of enzymes hardens and darkens the new shell. Scientists switched off the main enzyme gene in superworms using two different tools and found the insects stayed ghostly pale and soft, grew poorly, and could not finish their life cycle. The study also establishes CRISPR gene-editing in this species for the first time, giving researchers a reliable way to study superworm biology going forward.
Key Findings
RNAi silencing of Zmlaccase2 caused persistent depigmentation from larval through adult stages and reduced both pupation and adult emergence rates significantly
CRISPR/Cas9 knockout of Zmlaccase2 produced mosaic depigmentation and complete failure to pupate in all tested mutant individuals
Gene expression peaked during the prepupal and late pupal stages, tracking precisely with the periods of active shell remodeling
chevron_right Technical Summary
Researchers identified the gene Zmlaccase2 in superworm beetles (Zophobas morio) and showed it is essential for shell hardening, darkening, and completing metamorphosis. Blocking the gene by two independent methods left beetles pale and soft and prevented them from pupating or surviving to adulthood.
Abstract Preview
Original paper
Zmlaccase2 is essential for cuticle pigmentation and development in the edible beetle Zophobas morio.
Laccase2 is a multicopper oxidase that plays a central role in insect cuticle tanning and sclerotization, yet its molecular characteristics and biological functions remain poorly understood in the ...
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