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Vol. 18, Issue 9, 3290-3301, September 2007
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*Division of Emerging and Transfusion Transmitted Diseases, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, MD 20892; Department of Pharmaceutical Chemistry, University of California, San Francisco, CA 94143; Department of Genetics and Biochemistry, Clemson University, Clemson, SC 29634; and ||Tumor Biology Program, Mayo Clinic College of Medicine, Rochester, MN 55905
Submitted January 12, 2007;
Revised May 22, 2007;
Accepted June 6, 2007
Monitoring Editor: Orna Cohen-Fix
Centrin is a calcium-binding centrosome/basal body–associated protein involved in duplication and segregation of these organelles in eukaryotes. We had shown that disruption of one of the centrin genes (centrin1) in Leishmania amastigotes resulted in failure of both basal body duplication and cytokinesis. Here, we undertook to define the role of centrin1 (TbCen1) in the duplication and segregation of basal body and its associated organelles kinetoplast and Golgi, as well as its role in cytokinesis of the procyclic form of Trypanosoma brucei by depleting its protein using RNA inhibition methodology. TbCen1-depleted cells showed significant reduction in growth compared with control cells. Morphological analysis of these cells showed they were large and pleomorphic with multiple detached flagella. Both immunofluorescence assays using organelle-specific antibodies and electron microscopic analysis showed that TbCen1-deficient cells contained multiple basal bodies, kinetoplasts, Golgi, and nuclei. These multiple organelles were, however, closely clustered together, indicating duplication without segregation in the absence of centrin. This failure in organelle segregation may be the likely cause of inhibition of cytokinesis, suggesting for the first time a new and unique role for centrin in the segregation of organelles without affecting their multiplication in the procyclic form of T. brucei.
The online version of this article contains supplemental material at MBC Online (http://www.molbiolcell.org).
These authors contributed equally to this work.
Address correspondence to: Hira L. Nakhasi (hira.nakhasi{at}fda.hhs.gov) or Angamuthu Selvapandiyan (angamuthu.selvapandiyan{at}fda.hhs.gov).
Abbreviations used: HA, hemagglutinin; DAPI, 4'6-diamidino-2-phenylindole; ORF, open reading frame; pAb, polyclonal antibodies; EM, electron microscopy.
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