Unusual pattern of mitosis in the free-living flagellateDimastigella mimosa (Kinetoplastida) |
| |
Authors: | A O Frolov S O Skarlato |
| |
Institution: | (1) Laboratory of Protozoology, Zoological Institute, Russian Academy of Sciences, 32 Angliskyi prospect, 190121 St. Petersburg, Russia;(2) Institute of Cytology, Russian Academy of Sciences, St. Petersburg |
| |
Abstract: | Summary The three-dimensional ultrastructural organization of the mitotic apparatus ofDimastigella mimosa was studied by computer-aided, serial-section reconstruction. The nuclear envelope remains intact during nuclear division. During mitosis, chromosomes do not condense, whereas intranuclear microtubules are found in close association with six pairs of kinetochores. No discrete microtubule-organizing centers, except kinetochore pairs, could be found within the nucleus. The intranuclear microtubules form six separate bundles oriented at different angles to each other. Each bundle contains up to 8 tightly packed microtubules which push the daughter kinetochores apart. At late anaphase only, midzones of these bundles align along an extended interzonal spindle within the narrow isthmus between segregating progeny nuclei. The nuclear division inD. mimosa can be described as closed intranuclear mitosis with acentric and separate microtubular bundles and weakly condensed chromosomes.Abbreviation MTOC
microtubule-organizing center |
| |
Keywords: | Kinetochore Kinetoplastida Intranuclear microtubules Mitosis Ultrastructure |
本文献已被 SpringerLink 等数据库收录! |
|