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First published online November 19, 2004
Journal of Experimental Biology 207, 4473-4477 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.01304

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Metamorphosis in Xenopus laevis is not associated with large-scale nuclear DNA content variation

Jennifer L. Freeman and A. Lane Rayburn^*

Department of Crop Sciences, 320 ERML, 1201 W. Gregory Drive, University of Illinois, Urbana, IL 61801, USA

^* Author for correspondence (e-mail: arayburn{at}uiuc.edu)

Accepted 22 September 2004

Amphibian metamorphosis is a complex process that has been speculated to involve DNA amplification and chromatin rearrangement. While recent studies have concentrated on chromatin rearrangement, only a few studies have dealt with variation in the amount of DNA during amphibian metamorphosis. In this study, nuclei were isolated from Xenopus laevis at various developmental stages. The nuclei were examined in both an unfixed state and a fixed state. The nuclei were stained with propidium iodide and analyzed by flow cytometry to determine their fluorescence intensity. The unfixed nuclei had higher fluorescence variation compared with the fixed nuclei. This increase in variation appeared due to the presence of nuclei of variable fluorescence intensity within the unfixed nuclei. Upon optimum fixation, which has been speculated to result in more homogeneous chromatin conformation and to reduce staining artifacts, the nuclei were observed to have less fluorescence intensity variation. The differential fluorescence observed in this study is consistent with the hypothesis that large-scale intra-individual DNA variation is not associated with amphibian metamorphosis.

Key words: nuclei, flow cytometry, development, metamorphosis, Xenopus

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