NDLI: Induction of nucleolar and mitochondrial DNA replication in Tetrahymena pyriformis.

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Induction of nucleolar and mitochondrial DNA replication in Tetrahymena pyriformis.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Engberg, J. Leick, V. Nilsson, J. R. Pearlman, R. E.
Abstract	Selective induction of replication of nucleolar and mitochondrial DNA has been demonstrated in starved-refed cultures of Tetrahymena pyriformis by different techniques. Labeling of starved cells with [(3)H]thymidine during a nutritional shift-up and analysis of the DNA in isopycnic CsCl gradients shows that the two initially labeled species of DNA are two species banding on the heavy and light side of the bulk macronuclear DNA. In isolated macronuclei the radioactivity is found only in the high density fraction, which has been shown to be of nucleolar origin. In sucrose gradients the newly replicated mitochondrial and nucleolar DNAs sediment considerably slower than the bulk DNA, as one discrete band corresponding to a molecular weight of about 3 to 4 x 10(7). Electron microscope autoradiography of cells labeled with [(3)H]thymidine as above shows that the peripheral nucleoli of the macronucleus as well as the mitochondria are labeled before any radioactivity is found in the chromatin granules of the macronucleus. The results clearly indicate that nucleolar and mitochondrial DNA replication are under a control independent of that for the replication of bulk DNA.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	3
Volume Number	71
Language	English
Publisher	National Academy of Sciences
Publisher Date	1974-06-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	DNA Replication DNA, Mitochondrial Biosynthesis Tetrahymena Pyriformis Metabolism Animals Cell Nucleolus Cell Nucleus Centrifugation, Density Gradient DNA Isolation & Purification Hot Temperature Kinetics Microscopy, Electron Molecular Weight Nucleic Acid Denaturation Phosphorus Radioisotopes Cytology Thymidine Tritium Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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