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Modulating the bicoid gradient in space and time.

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The Bicoid (Bcd) gradient formation in Drosophila is complex, involving mRNA poly(A) tail length regulated by Wisp and Cyclin B. These factors influence gene expression and development, requiring revised models of gradient formation.

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Area of Science:

  • Developmental Biology
  • Molecular Genetics
  • Cell Biology

Background:

  • The Bicoid (Bcd) gradient in Drosophila embryogenesis is a key model for morphogen gradient formation.
  • Existing models, including the SDD and ARTS models, do not fully explain Bcd gradient mechanisms.

Purpose of the Study:

  • To identify novel cis- and trans-acting factors regulating Bcd gradient formation.
  • To investigate the role of mRNA poly(A) tail length and Cyclin B in Bcd gradient dynamics.

Main Methods:

  • Analysis of poly(A) tail length dynamics of bcd mRNA in relation to spatial and temporal factors.
  • Experimental manipulation of Wisp (poly(A) polymerase) and Cyclin B activity.
  • Assessment of Bcd gradient effects on downstream gene targets and embryonic patterning.
  • Utilizing the maternal haploid (mh) mutation to investigate nuclear cycle effects.

Main Results:

  • Identified poly(A) tail length of bcd mRNA as a dynamic factor, with posterior mRNA exhibiting longer tails, likely mediated by Wisp.
  • Demonstrated that modulating Wisp activity alters the Bcd gradient, affecting downstream gap and pair-rule genes and cuticular patterns.
  • Showed that an additional nuclear cycle (15th) via the mh mutation did not affect Bcd gradient formation, suggesting determination occurs within the first 14 cycles.
  • Identified Cyclin B as a trans-acting factor regulating Bcd protein movement within the embryo.

Conclusions:

  • Bcd gradient formation is more intricate than previously understood, necessitating a re-evaluation of current models.
  • Novel cis-acting factors (poly(A) tail length) and trans-acting factors (Cyclin B) play critical roles in establishing the Bcd gradient.