Juvenile hormone titers and caste differentiation in the damp-wood termite Hodotermopsis sjostedti (Isoptera, Termopsidae)

Cornette, Richard; Gotoh, Hiroki; Koshikawa, Shigeyuki; Miura, Toru

doi:10.1016/j.jinsphys.2008.04.017

Cited by 146 publications

(137 citation statements)

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“…J uvenile hormones (JHs) are acyclic sesquiterpenoid hormones that regulate important physiological and developmental processes among arthropods, including metamorphosis, moulting, growth, reproduction, sex and caste determination [1][2][3][4][5][6][7] . As exposure of JHs to animals can easily deflect developmental pathways, JHs are well studied in crustaceans for aquaculture [8][9][10] and in insects for agricultural pest control 11,12 .…”

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confidence: 99%

A mutation in the receptor Methoprene-tolerant alters juvenile hormone response in insects and crustaceans

et al. 2013

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Juvenile hormone is an essential regulator of major developmental and life history events in arthropods. Most of the insects use juvenile hormone III as the innate juvenile hormone ligand. By contrast, crustaceans use methyl farnesoate. Despite this difference that is tied to their deep evolutionary divergence, the process of this ligand transition is unknown. Here we show that a single amino-acid substitution in the receptor Methoprene-tolerant has an important role during evolution of the arthropod juvenile hormone pathway. Microcrustacea Daphnia pulex and D. magna share a juvenile hormone signal transduction pathway with insects, involving Methoprene-tolerant and steroid receptor coactivator proteins that form a heterodimer in response to various juvenoids. Juvenile hormone-binding pockets of the orthologous genes differ by only two amino acids, yet a single substitution within Daphnia Met enhances the receptor's responsiveness to juvenile hormone III. These results indicate that this mutation within an ancestral insect lineage contributed to the evolution of a juvenile hormone III receptor system.

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A mutation in the receptor Methoprene-tolerant alters juvenile hormone response in insects and crustaceans

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“…Moreover, Korb et al (2009) showed that JH hemolymph titer levels were different among larval and each nymphal instar (N1-5 in this species) of Cryptotermes secundus. JH titers of workers molting into presoldiers were shown to be increased in Hodotermopsis sjostedti (Cornette et al, 2008). Thus, there is suggested to be a different JH titer or a different threshold JH titer for the morphogenesis of soldier characteristics between N6 and N3-5 in R. speratus.…”

Section: Wings and Mandibles: Related Development Toward Opposite Dirmentioning

confidence: 95%

“…Although proximate mechanisms, or evolutionary mechanisms of sterile-caste (i.e., worker and soldier) differentiation are almost unknown (Korb and Hartfelder, 2008), juvenile hormone (JH) plays an important role in caste differentiation in termites. It is thought that changes in JH titers regulate the differentiation of soldiers and alates (Nijhout, 1982;Cornette et al, 2008). Especially for soldier differentiation, JH is suggested to be the central internal factor.…”

Section: Introductionmentioning

confidence: 99%

Effects of juvenile hormone III on morphogenetic changes during a molt from each nymphal instar in the termite Reticulitermes speratus (Isoptera: Rhinotermitidae)

Watanabe

Shirasaki

Maekawa

2010

Appl. Entomol. Zool.

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Termite castes are defined by their specific characteristics. It is said that juvenile hormone (JH) plays an important role in caste differentiation and JH has been shown to highly influence imaginal-organ development, as well as soldier-specific morphogenesis in some species. To provide additional comparative data for interpreting the effects of JH on the development of alate and soldier characteristics, we performed morphological investigations on newly molted individuals from different nymphal instars of Reticulitermes speratus induced by various concentrations of JH III. As a result, each organ (especially wing (-bud) and mandible) development was shown to be strongly affected by JH III in each nymphal instar. Moreover, depending on the JH III concentration, there was a trade-off-like relationship between wing formation (alate character) and mandibular elongation (soldier character) only in molted individuals from final instar nymphs. Our results suggest that the endogenous JH titer or the threshold titer for caste-specific morphogenesis changes via nymphal development in R. speratus. This study shows that highly developmental plasticity is retained in the derived species of termites, and that it must be a driving force of caste evolution.

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“…This may be an adaption to enable the high fecundity of termite queens, although similar duplications also exist in females of some solitary insects (e.g., Dittmann et al, 1989). In termites, as in many insects (cockroaches: Comas et al, 1999Comas et al, , 2001Süeren-Castillo et al, 2012;others: Nijhout, 1994), generally high vitellogenin titers correlate with high JH titers Maekawa et al, 2010;reviewed in: Korb, 2015) (exception: the archotermopsid Hodotermopsis sjostedti ;Cornette et al, 2008). The causal link between both was recently confirmed with RNAi experiments (Saiki et al, 2015).…”

Section: Frontiers In Ecology and Evolution | Wwwfrontiersinorgmentioning

confidence: 98%

Genes Underlying Reproductive Division of Labor in Termites, with Comparisons to Social Hymenoptera

Korb

2016

Front. Ecol. Evol.

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All social insects are characterized by a reproductive division of labor. Within a colony only a few individuals reproduce (queens and in termites, also a king) while the large majority (workers and soldiers) forgo reproduction, at least temporarily. The evolution of such reproductive altruism can ultimately be explained by inclusive fitness theory. Here, I will review the proximate genetic mechanisms underlying this altruism in termites. As social cockroaches they evolved eusociality independently from the social Hymenoptera, which makes them interesting test cases to look for common underlying mechanisms of eusociality and lineage specific idiosyncrasies. First, I will provide a summary of the genes and their function that have been identified to underlie reproductive division of labor-so called "queen genes,"-in the drywood termite Cryptotermes secundus, an emerging model to study termite social evolution. Second, I outline how widespread these queen genes are across the termite phylogeny, using also evidence from recent genome analyses. I will provide hypotheses about the evolutionary origin of these queen genes, aiming to link proximate mechanisms with ultimate functions. Finally, I will draw comparisons to social Hymenoptera to indicate potential common underpinnings that warrant further testing.

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Juvenile hormone titers and caste differentiation in the damp-wood termite Hodotermopsis sjostedti (Isoptera, Termopsidae)

Cited by 146 publications

References 43 publications

A mutation in the receptor Methoprene-tolerant alters juvenile hormone response in insects and crustaceans

A mutation in the receptor Methoprene-tolerant alters juvenile hormone response in insects and crustaceans

Effects of juvenile hormone III on morphogenetic changes during a molt from each nymphal instar in the termite Reticulitermes speratus (Isoptera: Rhinotermitidae)

Genes Underlying Reproductive Division of Labor in Termites, with Comparisons to Social Hymenoptera

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