Analysis of C. elegans VIG-1 Expression

  • Shin, Kyoung-Hwa (School of Life Sciences, Chungbuk National University) ;
  • Choi, Boram (School of Life Sciences, Chungbuk National University) ;
  • Park, Yang-Seo (School of Life Sciences, Chungbuk National University) ;
  • Cho, Nam Jeong (School of Life Sciences, Chungbuk National University)
  • Received : 2008.06.02
  • Accepted : 2008.09.09
  • Published : 2008.12.31


Double-stranded RNA (dsRNA) induces gene silencing in a sequence-specific manner by a process known as RNA interference (RNAi). The RNA-induced silencing complex (RISC) is a multi-subunit ribonucleoprotein complex that plays a key role in RNAi. VIG (Vasa intronic gene) has been identified as a component of Drosophila RISC; however, the role VIG plays in regulating RNAi is poorly understood. Here, we examined the spatial and temporal expression patterns of VIG-1, the C. elegans ortholog of Drosophila VIG, using a vig-1::gfp fusion construct. This construct contains the 908-bp region immediately upstream of vig-1 gene translation initiation site. Analysis by confocal microscopy demonstrated GFP-VIG-1 expression in a number of tissues including the pharynx, body wall muscle, hypodermis, intestine, reproductive system, and nervous system at the larval and adult stages. Furthermore, western blot analysis showed that VIG-1 is present in each developmental stage examined. To investigate regulatory sequences for vig-1 gene expression, we generated constructs containing deletions in the upstream region. It was determined that the GFP expression pattern of a deletion construct (${\Delta}-908$ to -597) was generally similar to that of the non-deletion construct. In contrast, removal of a larger segment (${\Delta}-908$ to -191) resulted in the loss of GFP expression in most cell types. Collectively, these results indicate that the 406-bp upstream region (-596 to -191) contains essential regulatory sequences required for VIG-1 expression.


C. elegans;RNA-induced silencing complex;RNA interference;VIG-1


Supported by : Korea Research Foundation


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