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Published on: August 27, 2011
Drosophila Mcm10 is required for DNA replication and differentiation in the compound eye
Nicole Vo1, Ayano Taga1, Yasuhiro Inaba1
1Department of Applied Biology, Kyoto Institute of Technology, Kyoto, Japan; Insect Biomedical Research Center, Kyoto Institute of Technology, Kyoto, Japan.
Abstract:
Mini chromosome maintenance 10 (Mcm10) is an essential protein, which is conserved from S. cerevisiae to Drosophila and human, and is required for the initiation of DNA replication. Knockdown of Drosophila Mcm10 (dMcm10) by RNA interference in eye imaginal discs induces abnormal eye morphology (rough eye phenotype), and the number of ommatidia is decreased in adult eyes. We also observed a delay in the S phase and M phase in eye discs of dMcm10 knockdown fly lines. These results show important roles for dMcm10 in the progression of S and M phases. Furthermore, genome damage and apoptosis were induced by dMcm10 knockdown in eye imaginal discs. Surprisingly, when we used deadpan-lacZ and klingon-lacZ enhancer trap lines to monitor the photoreceptor cells in eye discs, knockdown of dMcm10 by the GMR-GAL4 driver reduced the signals of R7 photoreceptor cells. These data suggest an involvement of dMcm10 in R7 cell differentiation. This involvement appears to be independent of the apoptosis induced by dMcm10 knockdown. Together, these results suggest that dMcm10 knockdown has an effect on DNA replication and R7 cell differentiation.
Insights
Mini chromosome maintenance 10 (Mcm10) is crucial for DNA replication and cell cycle progression. Knockdown in Drosophila eyes disrupts development, causing abnormal morphology and affecting R7 cell differentiation.
Area of Science:
- Molecular Biology
- Developmental Biology
- Genetics
Background:
- Mini chromosome maintenance 10 (Mcm10) is an essential conserved protein.
- Mcm10 plays a critical role in the initiation of DNA replication.
Purpose of the Study:
- To investigate the function of Drosophila Mcm10 (dMcm10) in eye development.
- To determine the role of dMcm10 in cell cycle progression, genome stability, and cell differentiation.
Main Methods:
- RNA interference (RNAi) mediated knockdown of dMcm10 in Drosophila eye imaginal discs using the GMR-GAL4 driver.
- Analysis of eye morphology, ommatidia count, cell cycle progression (S and M phases), genome damage, apoptosis, and R7 photoreceptor cell differentiation using enhancer trap lines (deadpan-lacZ, klingon-lacZ).
Main Results:
- dMcm10 knockdown resulted in a rough eye phenotype and reduced ommatidia number.
- Delayed S and M phase progression was observed in dMcm10 knockdown eye discs.
- Genome damage and apoptosis were induced by dMcm10 knockdown.
- Knockdown of dMcm10 reduced R7 photoreceptor cell signals, suggesting a role in R7 cell differentiation, independent of apoptosis.
Conclusions:
- dMcm10 is essential for normal eye development in Drosophila.
- dMcm10 plays significant roles in DNA replication, cell cycle progression, and R7 cell differentiation.
- dMcm10 knockdown leads to developmental defects including abnormal morphology, cell cycle delays, genome instability, and impaired R7 cell differentiation.
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