Interaction between Ataxin-2 Binding Protein 1 and Cubitus-interruptus during wing development in Drosophila

Area of Science:

• Developmental Biology
• Molecular Genetics
• Signal Transduction

Background:

• Animal growth and development rely on conserved signaling pathways like the Hedgehog (Hh) pathway.
• Cubitus-interruptus (Ci) is traditionally considered the sole mediator of Hh pathway functions.

Purpose of the Study:

• To investigate the role of CG32062, the Drosophila homologue of Ataxin-2 Binding Protein 1 (dA2BP1), in Hh pathway signaling.
• To elucidate the mechanism by which Ci regulates gene targets, particularly in the context of wing development.

Main Methods:

• Utilized Drosophila melanogaster as a model organism.
• Performed protein interaction studies to assess molecular complex formation.
• Conducted chromatin-immunoprecipitation experiments to determine DNA binding interactions.
• Analyzed gene expression patterns in developing wing imaginal discs.

Main Results:

• Identified dA2BP1 as a functional cofactor for Ci in specifying the intervein region between L3 and L4 wing veins.
• Demonstrated that Ci-mediated transactivation of the knot/collier (kn) gene is dependent on dA2BP1.
• Provided evidence that Ci facilitates dA2BP1 binding to the kn promoter, enhancing kn expression.

Conclusions:

• dA2BP1 plays a critical role as a cofactor for Ci in the Hh pathway during Drosophila wing development.
• Established a novel mechanism where Ci, with the help of dA2BP1, can activate target genes like kn that lack canonical Ci/Gli-binding sites.