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Updated: May 9, 2026
Generating a "Humanized" Drosophila S2 Cell Line Sensitive to Pharmacological Inhibition of Kinesin-5
Published on: January 20, 2016
Development of a Drosophila cell-based error correction assay
Jeffrey D Salemi1, Philip T McGilvray, Thomas J Maresca
1Biology Department, University of Massachusetts , Amherst, MA , USA.
Abstract:
Accurate transmission of the genome through cell division requires microtubules from opposing spindle poles to interact with protein super-structures called kinetochores that assemble on each sister chromatid. Most kinetochores establish erroneous attachments that are destabilized through a process called error correction. Failure to correct improper kinetochore-microtubule (kt-MT) interactions before anaphase onset results in chromosomal instability (CIN), which has been implicated in tumorigenesis and tumor adaptation. Thus, it is important to characterize the molecular basis of error correction to better comprehend how CIN occurs and how it can be modulated. An error correction assay has been previously developed in cultured mammalian cells in which incorrect kt-MT attachments are created through the induction of monopolar spindle assembly via chemical inhibition of kinesin-5. Error correction is then monitored following inhibitor wash out. Implementing the error correction assay in Drosophila melanogaster S2 cells would be valuable because kt-MT attachments are easily visualized and the cells are highly amenable to RNAi and high-throughput screening. However, Drosophila kinesin-5 (Klp61F) is unaffected by available small molecule inhibitors. To overcome this limitation, we have rendered S2 cells susceptible to kinesin-5 inhibitors by functionally replacing Klp61F with human kinesin-5 (Eg5). Eg5 expression rescued the assembly of monopolar spindles typically caused by Klp61F depletion. Eg5-mediated bipoles collapsed into monopoles due, in part, to kinesin-14 (Ncd) activity when treated with the kinesin-5 inhibitor S-trityl-L-cysteine (STLC). Furthermore, bipolar spindles reassembled and error correction was observed after STLC wash out. Importantly, error correction in Eg5-expressing S2 cells was dependent on the well-established error correction kinase Aurora B. This system provides a powerful new cell-based platform for studying error correction and CIN.
Insights
Researchers developed a new cell model to study how cells correct errors during division, which is crucial for preventing chromosomal instability and understanding cancer development.
Area of Science:
- Cell Biology
- Genetics
- Cancer Research
Background:
- Accurate genome transmission during cell division relies on microtubule-kinetochore interactions.
- Errors in these interactions can lead to chromosomal instability (CIN), a hallmark of cancer.
- Understanding error correction mechanisms is vital for cancer research.
Purpose of the Study:
- To establish a novel cell-based platform in Drosophila S2 cells for studying kinetochore-microtubule error correction.
- To overcome limitations of existing methods, particularly the lack of suitable inhibitors for Drosophila kinesin-5.
Main Methods:
- Functionally replaced Drosophila kinesin-5 (Klp61F) with human kinesin-5 (Eg5) in S2 cells.
- Induced monopolar spindles using kinesin-5 inhibitor S-trityl-L-cysteine (STLC).
- Monitored error correction upon inhibitor washout, assessing dependence on Aurora B kinase.
Main Results:
- Eg5 expression enabled STLC-induced monopolar spindle formation in S2 cells.
- Spindle bipolarity was restored and error correction occurred after STLC removal.
- Error correction in this system was dependent on Aurora B kinase activity.
Conclusions:
- A new, powerful cell-based system in Drosophila S2 cells was established for studying error correction.
- This platform facilitates research into the molecular basis of CIN and potential therapeutic strategies.
