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Organ growth coordination in Drosophila is regulated by Dilp8 hormone and its receptor Lgr3. The transcriptional co-activator Yki fine-tunes this process by controlling dilp8 expression, ensuring proper body proportions.

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Area of Science:

  • Developmental biology
  • Genetics
  • Endocrinology

Background:

  • Organ size and body proportions are crucial for organismal fitness.
  • Organ growth must be coordinated to ensure proper body proportions, despite autonomous organ growth programs.
  • The Insulin/Relaxin-like peptide 8 (Dilp8) hormone and its receptor Lethal giant larvae homolog 3 (Lgr3) are known regulators of inter-organ communication and growth coordination in Drosophila.

Purpose of the Study:

  • To investigate the role of transcriptional co-activators in regulating inter-organ growth coordination.
  • To elucidate the molecular mechanisms by which organ growth is coordinated with overall body size.
  • To understand the contribution of the Hippo pathway transcriptional co-activator Yki to Dilp8-mediated growth control.

Main Methods:

  • Genetic manipulation of Yki and Dilp8 pathways in Drosophila melanogaster.
  • Analysis of organ size and developmental timing.
  • Gene expression analysis of dilp8.

Main Results:

  • The transcriptional co-activator Yki (homologue of YAP/TAZ in mammals) was identified as a regulator of dilp8 expression.
  • Yki activity is necessary to limit developmental variability and ensure proper organ size coordination.
  • Yki contributes to the Dilp8-mediated signaling pathway that coordinates growth between different organs.

Conclusions:

  • Yki plays a critical role in coordinating organ growth by regulating the expression of the Dilp8 hormone.
  • This finding reveals a novel link between the Hippo signaling pathway and endocrine regulation of body size.
  • The Yki-Dilp8 axis is essential for maintaining developmental plasticity and ensuring proportional growth in Drosophila.