Packaging of Subchromosomal-Size DNA Molecules in Chromatin Bodies in the Ciliate Macronucleus View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2021-11

AUTHORS

O. G. Leonova, A. A. Potekhin, I. V. Nekrasova, B. P. Karajan, B. V. Syomin, V. S. Prassolov, V. I. Popenko

ABSTRACT

A fundamental difference between somatic nuclei (macronuclei) of ciliates and cell nuclei of higher eukaryotes is that the macronuclear genome is a huge number (up to tens or hundreds of thousands) of gene-sized (0.5–25 kb) or subchromosomal (up to 2000 kb) minichromosomes. Electron microscopy shows that macronuclear chromatin usually looks like chromatin bodies or fibrils 200–300 nm thick in the interphase. However, the question of how many DNA molecules are contained in an individual chromatin body remains open. The organization of chromatin in macronuclei was studied in the ciliates Didinium nasutum and three Paramecium sp., which differ in pulsed-field gel electrophoresis (PFGE) karyotype, and compared with the model of topologically associated domains (TADs) of higher eukaryotic nuclei. PFGE showed that the sizes of macronuclear DNAs ranged from 50 to 1700 kb, while the majority of the molecules were less than 500 kb in length. A comparative quantitative analysis of the PFGE and electron microscopic data showed that each chromatin body contained one minichromosome in P. multimicronucleatum in the logarithmic growth phase, while bodies in the D. nasutum macronucleus contained two or more DNA molecules each. Chromatin bodies aggregated during starvation, when activity of the macronuclei decreased, leading to an increase of chromatin body size or the formation of 200- to 300-nm fibrils of several chromatin bodies. A model was proposed to explain the formation of such structures. In terms of topological characteristics, macronuclear chromatin bodies with subchromosomal DNA molecules were found to correspond to higher eukaryotic TADs. More... »

PAGES

899-909

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0026893321050083

DOI

http://dx.doi.org/10.1134/s0026893321050083

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1143980400


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