By G.H. Bourne, J.F. Danielli and K.W. Jeon (Eds.)
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Extra resources for International Review of Cytology, Vol. 64
1 . Composition It can justifiably be argued that there is insufficient data on the composition of the spindles of any organisms to permit useful discussion of possible evolutionary relationships. However, there are a number of points that can be made. , 1974). In either case, the analysis is inaccurate, since it is based on less or more than the functional spindle. , Physarum (Oppenheim and Katzir, 197 1). Unfortunately, such spindles would still be contaminated by nucleoplasm, but since this is arguably a component of the spindle in any case, it may be a less serious problem than those facing the isolators of open spindles.
These 32 I. BRENT HEATH structures have been given a large number of different, but equivalent, names: nucleus associated organelle (NAO) of Girbardt and Hadrich (1975); spindle pole body (SPB) of Aist and Williams (1972); microtubule organizing center (MTOC) of Pickett-Heaps (1969); spindle or centrosomal plaque of Robinow and Marak (1966); and nucleus associated body (NAB) of Roos (1975a). In the present work, two generic names will be used; centrioles, for those structures that are clearly related to the familiar array of nine triplet microtubules and their associated linking structures, and nucleus associated organelles (NAOs) (Girbardt and Hadrich, 1975), for the range of other structures, including the intranuclear structures from which spindle microtubules of Physarum, Oedogonium, Minchinia, and Sapromyces seem to originate.
There are two obvious ways in which an MTOC could function in controlling microtubule formation: (1) as a template, and (2) as a controller of local cellular environmental conditions such that self assembly could be induced. , the surrounding medium). However the vesicles that are frequently associated with the NAOs could have a role in controlling the local cellular environment (see Heath, 1978a, for a partial listing of organisms containing such vesicles, and Pickett-Heaps and Tippit, 1978, for further comment on this point).