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Juvenile hormone regulates butterfly larval pattern switches
Ryo Futahashi1, Haruhiko Fujiwara
1Department of Integrated Biosciences, Graduate School of Frontier Sciences, University of Tokyo, Bioscience Building 501, Kashiwa, Chiba 277-8562, Japan.
Juvenile hormone (JH) regulates the dramatic color pattern changes in Papilio xuthus caterpillars. Lowering JH levels triggers a switch from a bird dropping mimicry pattern to a cryptic leaf camouflage pattern.
Area of Science:
- Developmental Biology
- Insect Morphology
- Chemical Ecology
Background:
- Insect larval stages exhibit diverse and dynamic color patterns.
- The swallowtail butterfly, Papilio xuthus, displays distinct phenotypes across instars, including a mimetic pattern in early stages and a cryptic pattern in later stages.
Purpose of the Study:
- To investigate the role of juvenile hormone (JH) in regulating the switch between larval color patterns in Papilio xuthus.
- To understand the molecular mechanisms underlying JH-mediated pattern changes.
Main Methods:
- Quantification of juvenile hormone (JH) titers during the fourth larval instar.
- Experimental manipulation of JH levels using a JH analog.
- Analysis of larval color patterns and gene expression.
Main Results:
- Juvenile hormone (JH) titers were observed to decrease during the fourth larval instar.
- Treatment with a JH analog induced the mimetic pattern, overriding the typical cryptic pattern.
- Altered gene expression patterns were associated with the JH-induced mimetic phenotype.
Conclusions:
- Juvenile hormone (JH) plays a critical role in regulating the progressive switch of larval color patterns in Papilio xuthus.
- JH influences both the morphological phenotype and the underlying gene expression driving pattern development.
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