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Fig. 8. Comparison of genetic interactions in embryonic epidermis and in the
mature female genital disc, and organization of the A8 in the female genital
disc. (A) Regulatory interactions between abd-A, Abd-B and
Dll in the embryonic epidermis and in the mature genital discs. In
the embryo, Abd-B represses abd-A in the A8, and
abd-A represses Dll in the abdominal segments. In the third
instar female genital disc, it seems that Abd-B maintains
abd-A transcription, and that ectopic Dll can repress
abd-A. (B) In the A8 of the female disc we can distinguish two
regions (Estrada and
Sánchez-Herrero, 2001) (this report). The anterior region
(region I, purple) expresses buttonhead, abd-A and low levels of
Abd-B, and can activate Dll in the absence of
Abd-B. It represents the `appendage' part of the genitalia and
corresponds mainly or exclusively to the internal genitalia. The lower region
(region II) does not express abd-A or buttonhead, but
expresses high levels of Abd-B. It corresponds to the `trunk' region
of the female A8. In this region, Dll is not activated in the absence
of Abd-B.
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