Transgene-mediated co-suppression of DNA topoisomerase-1 gene in caenorhabditis elegans

Myon Hee Lee, Dong Seok Cha, Srivalli Swathi Mamillapalli, Young Chul Kwon, Hyeon Sook Koo

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4 Citations (Scopus)


Ectopic expression of multi-transgenic copies can result in reduced expression of the transgene and can induce silence of endogenous gene; this process is called as co-suppression. Using a transgene-mediated co-suppression technique, we demonstrated the biological function of DNA topoisomerase-1 (top-1) in C. elegans development. Introduction of full-length top-1 transgene sufficiently induced the co-suppression of endogenous top-1 gene, causing embryonic lethality and abnormal germline development. We also found that the co-suppression of top-1 gene affected morphogenesis, lifespan and larval growth that were not observed in top-1(RNAi) animals. Strikingly, co-suppression effects were significantly reduced by the elimination of top-1 introns, suggesting that ef-ficient co-suppression may require intron(s) in C. elegans. Sequence analysis revealed that the introns 1 and 2 of top-1 gene possess consensus binding sites for several transcription factors, including MAB-3, LIN-14, TTX-3/CEH-10, CEH-1, and CEH-22. Among them, we examined a genetic link between ceh-22 and top-1. The ceh-22 is partially required for the specification of distal tip cells (DTC), which functions as a stem cell niche in the C. elegans gonad. Intriguingly, top-1(RNAi) significantly enhanced DTC loss in ceh-22 mutant gonads, indicating that top-1 may play an important role in CEH-22-mediated DTC fate specification. Therefore, our findings suggest that transgene-mediated co-suppression facilitates the silencing of the specific genes and the study of gene function in vivo.

Original languageEnglish
Pages (from-to)11-20
Number of pages10
JournalInternational Journal of Biochemistry and Molecular Biology
Issue number1
Publication statusPublished - 2014

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology


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