Remodeling of the juvenile hormone pathway through caste-biased gene expression and positive selection along a gradient of termite eusociality

Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution
Evelien JongepierJudith Korb

Abstract

The evolution of division of labor between sterile and fertile individuals represents one of the major transitions in biological complexity. A fascinating gradient in eusociality evolved among the ancient hemimetabolous insects, ranging from noneusocial cockroaches through the primitively social lower termites-where workers retain the ability to reproduce-to the higher termites, characterized by lifetime commitment to worker sterility. Juvenile hormone (JH) is a prime candidate for the regulation of reproductive division of labor in termites, as it plays a key role in insect postembryonic development and reproduction. We compared the expression of JH pathway genes between workers and queens in two lower termites (Zootermopsis nevadensis and Cryptotermes secundus) and a higher termite (Macrotermes natalensis) to that of analogous nymphs and adult females of the noneusocial cockroach Blattella germanica. JH biosynthesis and metabolism genes ranged from reproductive female-biased expression in the cockroach to predominantly worker-biased expression in the lower termites. Remarkably, the expression profile of JH pathway genes sets the higher termite apart from the two lower termites, as well as the cockroach, indicating that JH sig...Continue Reading

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Citations

Sep 1, 2018·Journal of Experimental Zoology. Part B, Molecular and Developmental Evolution·Erich Bornberg-BauerEvelien Jongepier
Aug 30, 2020·Hormones and Behavior·Hagai Y ShpiglerGuy Bloch
Mar 9, 2021·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Judith KorbUNKNOWN So-Long consortium

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