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Fig. 6. The expression pattern of mirr diverged evolutionarily between
D. melanogaster and D.
virilis. (A-H) The expression of mirr was
detected by in situ hybridization during the DA formation in D.
melanogaster (A-D) and D. virilis (E-H). (A) D. melanogaster
mirr was expressed as a single broad domain at the dorsal-anterior region
of the follicle cells at stage 9. (B) At stage 10A the D. melanogaster
mirr expression was repressed in the dorsal midline (white arrowhead) and
elevated in the cells at the anterior border of this expression domain (white
arrow). By stage 10B, the mirr expression was restricted to the
single row of anterior cells on either side of the midline (white arrow in C),
and then was barely detected at stage 11 (D). (E) D. virilis mirr was
expressed at stage 9 at the dorsal-anterior region of the follicle cells, like
D. melanogaster mirr. (F) The mirr expression was gradually
lost from the anterior region of its expression domain (white arrowhead) early
in stage 10A. (G) By late in stage 10A, the D. virilis mirr
expression was resolved into two dorso-lateral domains, similar to D.
virilis rho expression at the same stage (see
Fig. 1E). Note that the
mirr expression was absent from a triangle at the anterior midline
region of the follicle cells. (H) The expression was almost absent at stage
11.
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