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      Differences in Renal Tubule Primary Cilia Length in a Mouse Model of Bardet-Biedl Syndrome

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          Background: Bardet-Biedl syndrome (BBS) is a heterogeneous genetic disorder that comprises numerous features, including renal cystic disease. Twelve BBS genes have been identified (BBS1–12). Although the exact functions of the BBS proteins are unknown, evidence suggests that they are involved in cilia assembly, maintenance and/or function. Renal primary cilia dysfunction can lead to cystic kidney disease. To test whether lacking Bbs4 affects cilia assembly and structure, we analyzed primary cilia in Bbs4-null (Bbs4<sup>–/–</sup> ) mice. Methods: Renal tubule cultures from wild-type (Bbs4<sup>+/+</sup> ) and Bbs4<sup>–/–</sup> mice were examined by immunocytochemistry and scanning and transmission electron microscopy. Results: Our culture conditions generated ciliated epithelial cells that were mostly of collecting duct origin. The microtubule ultrastructure of cilia and basal bodies did not appear disrupted in Bbs4<sup>–/–</sup> cells. In control cells, cilia length was maximal at 7 days in culture. In cells cultured from Bbs4<sup>–/–</sup> mice, cilia were shorter initially, but surpassed the length of control cilia by 10 days. Renal primary cilia were also longer in Bbs4<sup>–/–</sup> kidneys. Conclusions: Lacking Bbs4 does not lead to aberrant cilia or basal body structure. However, the dynamics of cilia assembly is altered in Bbs4<sup>–/–</sup> cells, suggesting a role for Bbs4 in the regulation of ciliary assembly.

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          Most cited references 32

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          Comparative genomics identifies a flagellar and basal body proteome that includes the BBS5 human disease gene.

          Cilia and flagella are microtubule-based structures nucleated by modified centrioles termed basal bodies. These biochemically complex organelles have more than 250 and 150 polypeptides, respectively. To identify the proteins involved in ciliary and basal body biogenesis and function, we undertook a comparative genomics approach that subtracted the nonflagellated proteome of Arabidopsis from the shared proteome of the ciliated/flagellated organisms Chlamydomonas and human. We identified 688 genes that are present exclusively in organisms with flagella and basal bodies and validated these data through a series of in silico, in vitro, and in vivo studies. We then applied this resource to the study of human ciliation disorders and have identified BBS5, a novel gene for Bardet-Biedl syndrome. We show that this novel protein localizes to basal bodies in mouse and C. elegans, is under the regulatory control of daf-19, and is necessary for the generation of both cilia and flagella.
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            The Bardet-Biedl protein BBS4 targets cargo to the pericentriolar region and is required for microtubule anchoring and cell cycle progression.

            BBS4 is one of several proteins that cause Bardet-Biedl syndrome (BBS), a multisystemic disorder of genetic and clinical complexity. Here we show that BBS4 localizes to the centriolar satellites of centrosomes and basal bodies of primary cilia, where it functions as an adaptor of the p150(glued) subunit of the dynein transport machinery to recruit PCM1 (pericentriolar material 1 protein) and its associated cargo to the satellites. Silencing of BBS4 induces PCM1 mislocalization and concomitant deanchoring of centrosomal microtubules, arrest in cell division and apoptotic cell death. Expression of two truncated forms of BBS4 that are similar to those found in some individuals with BBS had a similar effect on PCM1 and microtubules. Our findings indicate that defective targeting or anchoring of pericentriolar proteins and microtubule disorganization contribute to the BBS phenotype and provide new insights into possible causes of familial obesity, diabetes and retinal degeneration.
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              Intraflagellar transport balances continuous turnover of outer doublet microtubules

              A central question in cell biology is how cells determine the size of their organelles. Flagellar length control is a convenient system for studying organelle size regulation. Mechanistic models proposed for flagellar length regulation have been constrained by the assumption that flagella are static structures once they are assembled. However, recent work has shown that flagella are dynamic and are constantly turning over. We have determined that this turnover occurs at the flagellar tips, and that the assembly portion of the turnover is mediated by intraflagellar transport (IFT). Blocking IFT inhibits the incorporation of tubulin at the flagellar tips and causes the flagella to resorb. These results lead to a simple steady-state model for flagellar length regulation by which a balance of assembly and disassembly can effectively regulate flagellar length.

                Author and article information

                Nephron Exp Nephrol
                Cardiorenal Medicine
                S. Karger AG
                July 2007
                22 May 2007
                : 106
                : 3
                : e88-e96
                Departments of aPharmacology and bInternal Medicine, Division of Human Genetics, Ohio State University, Columbus, Ohio, USA
                103021 Nephron Exp Nephrol 2007;106:e88–e96
                © 2007 S. Karger AG, Basel

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                Page count
                Figures: 3, Tables: 1, References: 52, Pages: 1
                Original Paper


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