Hormones and Sex-Specific Transcription Factors Jointly Control Yolk Protein Synthesis in Musca domestica

Figure 1

Ecdysteroid and YP concentrations in hemolymph of Musca domestica. In females, levels of ecdysteroids and yolk proteins oscillate in synchrony with the stages of ovarian development. Both levels reach a maximum in females with vitellogenic egg chambers. Stages 2-3: previtellogenic, stages 4–8: vitellogenic, stages 9-10: postvitellogenic stages. In males, the concentration of ecdysteroids is constantly low and no YP are produced. Summarized results from Adams and Filipi [13] and Adams et al. [14].