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Fig. 7. Schematics of the profile of Gb'byn expression and
function. (A) A comparison of extrapolated expression patterns of
Gb'hh, Gb'wg and Gb'cad in the
gut of wild-type (left) and Gb'byn RNAi (right) nymphs. In
Gb'byn RNAi nymphs, Gb'hh expression is
observed in the severely reduced hindgut as a probable combined pattern from
the small intestine and rectum sac, and in the small remnant of the Malpighian
tubules. Gb'wg expression seems to be observed in the small
intestine and posterior rectum of the severely reduced hindgut of
Gb'byn RNAi nymphs. Gb'cad expression in
the Gb'byn RNAi nymph seems to be observed in the small
remnant of the Malpighian tubules, and is almost completely eliminated in the
region surrounding the orifice of the rectum and posterior midgut. The hatched
regions indicate overlapping expression patterns. pv, proventriculus; gca,
gastric caecum; mg, midgut; mt, Malpighian tubules; si, small intestine; li,
large intestine; rsc, rectum sac; rec, rectum. (B) Comparison of the
expression of Gb'byn, Gb'wg and
Gb'cad in early embryos of Gryllus with those of
Drosophila and mouse. In early Gryllus embryos,
Gb'wg and Gb'cad expression is detected in
the posterior growth zone (Miyawaki et
al., 2004 ; Shinmyo et al.,
2005), whereas Gb'byn expression is restricted
in the posterior terminal region (see Fig.
2). In Drosophila, all three genes are expressed in the
posterior terminal region at the cellular blastoderm stage
(Hoch and Pankratz, 1996;
Kispert et al., 1994;
Singer et al., 1996;
Wu and Lengyel, 1998). In
mouse, all three genes are expressed in the primitive streak of early embryos
(Kispert and Herrmann, 1994;
Liu et al., 1999;
Meyer and Gruss, 1993).
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