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Comparative Study
. 2004 Jul;214(7):313-23.
doi: 10.1007/s00427-004-0408-2. Epub 2004 May 29.

Juvenile hormone acts at embryonic molts and induces the nymphal cuticle in the direct-developing cricket

Deniz F Erezyilmaz  1 , Lynn M Riddiford, James W Truman
Affiliations
Comparative Study

Juvenile hormone acts at embryonic molts and induces the nymphal cuticle in the direct-developing cricket

Deniz F Erezyilmaz et al. Dev Genes Evol. 2004 Jul.

Abstract

During embryogenesis of hemimetabolous insects, the sesquiterpenoid hormone, juvenile hormone (JH), appears late in embryogenesis coincident with formation of the first nymphal cuticle. We tested the role of embryonic JH by treating cricket embryos with JH III, or the JH-mimic (JHM) pyriproxifen, during early embryogenesis. We found two discrete windows of JH sensitivity. The first occurs during the formation of the first (E1) embryonic cuticle. Treatment with JHM prior to this molt produced small embryos that failed to complete the movements of katatrepsis. Embryos treated after the E1 molt but before the second embryonic (pronymphal) molt completed katatrepsis but then failed to complete dorsal closure and precociously formed nymphal, rather than pronymphal characters. This second sensitivity window was further assessed by treating embryos with low doses of JH III prior to the pronymphal molt. With low doses, mosaic cuticles were formed, bearing features of both the pronymphal and nymphal stages. The nymphal characters varied in their sensitivity to JH III, due at least in part to differences in the timing of their sensitivity windows. Unexpectedly, many of the JH III-treated embryos with mosaic and precocious nymphal cuticles made a second nymphal cuticle and successfully hatched. JH treatment also affected the growth of the embryos. By focusing on the developing limb, we found that the effect of JH upon growth was asymmetric, with distal segments more affected than proximal ones, but this was not reflected in misexpression of Distal-less or Bric-a-brac, which are involved in proximal-distal patterning of the limb.

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References

    1. Development. 1989 Oct;107(2):389-405 - PubMed
    1. Mech Dev. 2002 May;113(2):141-8 - PubMed
    1. Dev Biol. 1983 Jun;97(2):468-82 - PubMed
    1. Arch Insect Biochem Physiol. 1996;32(3-4):271-86 - PubMed
    1. Development. 1993 Nov;119(3):799-812 - PubMed

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