title: Analysis of xbx genes in C. elegans.
abstract: Cilia and flagella are widespread eukaryotic subcellular components that are conserved from green algae to mammals. In different organisms they function in cell motility, movement of extracellular fluids and sensory reception. While the function and structural description of cilia and flagella are well established, there are many questions that remain unanswered. In particular, very little is known about the developmental mechanisms by which cilia are generated and shaped and how their components are assembled into functional machineries. To find genes involved in cilia development we used as a search tool a promoter motif, the X-box, which participates in the regulation of certain ciliary genes in the nematode Caenorhabditis elegans. By using a genome search approach for X-box promoter motif-containing genes (xbx genes) we identified a list of about 750 xbx genes (candidates). This list comprises some already known ciliary genes as well as new genes, many of which we hypothesize to be important for cilium structure and function. We derived a C. elegans X-box consensus sequence by in vivo expression analysis. We found that xbx gene expression patterns were dependent on particular X-box nucleotide compositions and the distance from the respective gene start. We propose a model where DAF-19, the RFX-type transcription factor binding to the X-box, is responsible for the development of a ciliary module in C. elegans, which includes genes for cilium structure, transport machinery, receptors and other factors.
authors.affiliation: Karolinska Institute, Department of Biosciences and Södertörn University College, Section of Natural Sciences, S-14189 Huddinge, Sweden.
authors.forename: Evgeni
authors.initials: E
authors.lastname: Efimenko
authors.forename: Kerry
authors.initials: K
authors.lastname: Bubb
authors.forename: Ho Yi
authors.initials: HY
authors.lastname: Mak
authors.forename: Ted
authors.initials: T
authors.lastname: Holzman
authors.forename: Michel R
authors.initials: MR
authors.lastname: Leroux
authors.forename: Gary
authors.initials: G
authors.lastname: Ruvkun
authors.forename: James H
authors.initials: JH
authors.lastname: Thomas
authors.forename: Peter
authors.initials: P
authors.lastname: Swoboda
mesh_terms: D000818:Animals; D017173:Caenorhabditis elegans / Q000235:genetics*; D029742:Caenorhabditis elegans Proteins / Q000235:genetics*; D002923:Cilia / Q000235:genetics*; D019295:Computational Biology; D015870:Gene Expression; D005796:Genes / Q000235:genetics*; D049452:Green Fluorescent Proteins; D008856:Microscopy, Fluorescence; D008957:Models, Genetic; D009154:Mutation / Q000235:genetics; D011401:Promoter Regions, Genetic / Q000235:genetics*; D034622:RNA Interference; D014157:Transcription Factors / Q000235:genetics*
chemical_list: D029742:Caenorhabditis elegans Proteins; C410596:DAF-19 protein, C elegans; D014157:Transcription Factors; D049452:Green Fluorescent Proteins