ArticleBMC biology2024
Juvenile hormone signaling is indispensable for late embryogenesis in ametabolous and hemimetabolous insects.
Article in BMC biology, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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5 citing papers in PubMed.
- Cytochrome P450-mediated regulation of pheromone biosynthesis and adult emergence in Monochamus saltuarius (Coleoptera, Cerambycidae), with implications for pest management.Pest management science · 2026Article
- Evolution of environmental sex determination via juvenile hormone-induced gene co-option inProceedings of the National Academy of Sciences of the United States of America · 2026Article
- Knockdown of farnesyl pyrophosphate synthetase gene TuFPPS by RNAi extends quiescent period and halts molting of the spider mite, Tetranychus urticae.Experimental & applied acarology · 2025Article
- Unlocking the dual power of Charybdis natator shell: antiviral and larvicidal activities.Bioresources and bioprocessing · 2025Article
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9 authors.
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Abstract
backgroundJuvenile hormone (JH) is an insect-exclusive hormone involved in regulating diverse aspects of insect physiology, and the evolution of its diverse function is widely interesting. Studying embryogenesis in basal wingless insects is important to understand the functional evolution of JH; however, experimental studies in this regard are scarce. In this study, we conducted CRISPR/Cas9-mediated knockout (KO) of genes involved in JH biosynthesis and signaling cascades in the ametabolous firebrat, Thermobia domestica. Additionally, we investigated whether the primitive action of JH is conserved in the hemimetabolous cricket, Gryllus bimaculatus.
resultsWe observed that KO of JHAMT, CYP15A1, Met, and Kr-h1 resulted in embryonic lethality in T. domestica. Deprivation of JH or JH signaling arrested the progression of extraembryonic fluid resorption after dorsal closure and hatching, which is consistent with the gene expression pattern showing high Kr-h1 expression in the late embryos of T. domestica. The embryos deficient in JH signaling displayed wrinkled and weak legs. Comparative transcriptome analysis revealed that JH signaling promotes embryonic leg maturation through inducing energy supply and muscle activity, as validated by transmission electron microscopy (TEM). In addition, JH signaling exhibited similar embryonic effects in G. bimaculatus.
conclusionsThis study reveals the indispensable role of JH signaling in facilitating the maturation of terminal tissues during late embryogenesis, as demonstrated by the regulation of leg development, in ametabolous and hemimetabolous insects. These findings further indicate that the embryonic functions of JH evolved earlier than its anti-metamorphic functions during postembryonic development.
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