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Fig. 4. Diagrams depicting developmental gene networks and proposed gene
relationships, as suggested by the current research. (A)
Organization of a gene network involving JH-responsive genes from the signal
transduction, transcription and translation factors, and the cuticle and
muscle ontogeny categories. Solid arrows represent a simple hierarchical
cascade, whereas dotted arrows represent the more complex feedback between
levels that probably occurs. (B) Apparent relationship between
hexamerin titer and JH availability (Zhou
et al., 2006a; Zhou et al.,
2006b), as well as other putative intrinsic and extrinsic
caste-regulatory factors. Solid arrows represent what is known from prior and
current research, whereas dotted arrows illustrate the proposed relationships.
In this scheme, the hexamerins can be considered an environmentally-responsive
switching mechanism (Wheeler,
1986) that modulates JH-dependent morphogenesis.
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