A genetic screen to identify novel interactions of the phosphatidylinositol phosphate signaling pathway in Drosophila spermatogenesis
Phosphatidylinositol (PI) phosphates (PIPs) are membrane lipids with crucial roles in intracellular signaling, membrane trafficking and cytoskeletal organization. To perturb PIP function in Drosophila melanogaster sperm development, we previously expressed the Salmonella PIP phosphatase SigD (also known as SopB) under control of a spermatocyte- specific promoter. SigD expression results in…
Phosphatidylinositol (PI) phosphates (PIPs) serve vital functions in various cellular processes within Drosophila melanogaster sperm development. Previous research demonstrated that expressing the Salmonella PIP phosphatase SigD (SopB) under a spermatocyte-specific promoter leads to reduced levels of plasma membrane PI 4,5-bisphosphate (PIP2) and male sterility.
Transgenic lines displaying high (SigD-high) or low (SigD-low) levels of SigD exhibit defects in spermatocyte cytokinesis, ciliary transition zone maturation, spermatid elongation, nuclear shaping, and cell polarization, respectively.
To delve deeper into the PIPs' role during sperm development, researchers performed a sensitized genetic screen involving 760 chromosomal deficiencies covering 83.6% of chromosomes 2 and 3. This approach identified 80 interacting regions, which were subsequently narrowed down to 40 individual suppressors. Among the most significant interactors were genes linked to microtubule dynamics, nucleocytoplasmic transport, and membrane trafficking.
These novel genetic interactions offer valuable insights into the molecular mechanisms underlying the observed defects in sperm development.
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