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Updated: Oct 13, 2025
Use of Drosophila S2 Cells for Live Imaging of Cell Division
Published on: August 23, 2019
Pilot RNAi Screen in Drosophila Neural Stem Cell Lineages to Identify Novel Tumor Suppressor Genes Involved in
Sandra Manzanero-Ortiz1, Ana de Torres-Jurado1, Rubí Hernández-Rojas1
1Developmental Neurobiology Department, Instituto de Neurociencias, Consejo Superior de Investigaciones Científicas/Universidad Miguel Hernández, 03550 Sant Joan d'Alacant, Alicante, Spain.
Abstract:
A connection between compromised asymmetric cell division (ACD) and tumorigenesis was proven some years ago using Drosophila larval brain neural stem cells, called neuroblasts (NBs), as a model system. Since then, we have learned that compromised ACD does not always promote tumorigenesis, as ACD is an extremely well-regulated process in which redundancy substantially overcomes potential ACD failures. Considering this, we have performed a pilot RNAi screen in Drosophila larval brain NB lineages using Ras12 scribble (scrib) mutant clones as a sensitized genetic background, in which ACD is affected but does not cause tumoral growth. First, as a proof of concept, we have tested known ACD regulators in this sensitized background, such as lethal (2) giant larvae and warts. Although the downregulation of these ACD modulators in NB clones does not induce tumorigenesis, their downregulation along with Ras12 scrib does cause tumor-like overgrowth. Based on these results, we have randomly screened 79 RNAi lines detecting 15 potential novel ACD regulators/tumor suppressor genes. We conclude that Ras12 scrib is a good sensitized genetic background in which to identify tumor suppressor genes involved in NB ACD, whose function could otherwise be masked by the high redundancy of the ACD process.
Insights
This study identifies novel tumor suppressor genes by using a sensitized genetic background in Drosophila neuroblasts. This approach overcomes redundancy and reveals genes critical for asymmetric cell division (ACD) and tumor suppression.
Area of Science:
- Developmental Biology
- Genetics
- Cancer Research
Background:
- Asymmetric cell division (ACD) is crucial for development, and its disruption is linked to tumorigenesis.
- However, ACD is highly regulated, and failures do not always lead to tumor formation due to redundancy.
Purpose of the Study:
- To identify novel tumor suppressor genes involved in ACD in Drosophila neuroblasts.
- To establish a sensitized genetic background for uncovering ACD regulators masked by redundancy.
Main Methods:
- Conducted a pilot RNA interference (RNAi) screen in Drosophila larval brain neuroblast (NB) lineages.
- Utilized Ras12scribble (scrib) mutant clones as a sensitized genetic background to study ACD.
- Validated known ACD regulators (e.g., lethal(2)giant larvae, warts) in the sensitized background.
Main Results:
- The Ras12scribble background alone did not induce tumoral growth but sensitized NB ACD to failures.
- Downregulation of known ACD modulators with Ras12scribble caused tumor-like overgrowth.
- Screened 79 RNAi lines and identified 15 potential novel ACD regulators/tumor suppressor genes.
Conclusions:
- The Ras12scribble mutant clone system serves as an effective sensitized background for identifying tumor suppressor genes.
- This approach successfully uncovers genes involved in NB ACD whose functions are typically masked by redundancy.
