NDLI: Centrosome-associated RNA in surf clam oocytes.

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Centrosome-associated RNA in surf clam oocytes.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Alliegro, Mary Anne Alliegro, Mark C. Palazzo, Robert E.
Description	Author Affiliation: Alliegro MC ( Department of Cell Biology, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA.);
Abstract	Centrosomes are the major microtubule-organizing center in animal cells. They are composed of a pair of [9(3) + 0] centrioles surrounded by a relatively ill-defined pericentriolar matrix, provide the ciliary centriole-kinetosome (basal body) progenitor, and organize the assembly of microtubules into the mitotic spindle during cell division. Despite >100 years of microscopic observation and their obvious significance, our understanding of centrosome composition, dynamic organization, and mechanism of action is limited when compared with that of other cellular organelles. Centrosomes duplicate only once per cell cycle to ensure development of a normal bipolar spindle. The initial event in centrosome duplication is centriole replication, which is generative, semiconservative, and independent of the nucleus. Such observations led to the proposal that centrosomes contain their own complement of nucleic acids, possibly representative of an organellar genome comparable with those described for mitochondria and chloroplasts. The consensus in the field is that centrosomes lack DNA but may contain RNA. We isolated centrosomes from oocytes of the surf clam, Spisula solidissima, and purified from them a unique set of RNAs. We show here by biochemical means and subcellular in situ hybridization that the first transcript we analyzed is intimately associated with centrosomes. Sequence analysis reveals that this centrosome-associated RNA encodes a conserved RNA-directed polymerase domain. The hypothesis that centrosomes contain an intrinsic complement of specific RNAs suggests new opportunities to address the century-old problem of centrosome function, heredity, and evolution.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	24
Volume Number	103
Language	English
Publisher	National Academy of Sciences
Publisher Date	2006-06-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Bivalvia Genetics Centrosome Metabolism Oocytes Physiology RNA Amino Acid Sequence Animals Cytology Cytoplasm In Situ Hybridization Molecular Sequence Data Sequence Alignment Research Support, N.I.H., Extramural Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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