Organization and Control of Microtubule Pattern in Centrohelidan Heliozoa*†
作者:
CHRISTIAN F. BARDELE,
期刊:
The Journal of Protozoology
(WILEY Available online 1977)
卷期:
Volume 24,
issue 1
页码: 9-14
ISSN:0022-3921
年代: 1977
DOI:10.1111/j.1550-7408.1977.tb05274.x
出版商: Blackwell Publishing Ltd
关键词: Heliozoa;Centrohelida;axopodia;microtubule patterning;microtubule organizing center;linker‐induced microtubule nucleation
数据来源: WILEY
摘要:
SYNOPSIS.Comparative studies of axopodial microtubule pattern in 10 different centrohelidan Heliozoa belonging to the generaAcanthocystis, RaphidiophrysandHeterophryssuggest that 2 basic principles govern pattern formation in centrohelidan Heliozoa. While the larger “open” arrays with unspecified number of microtubules, e.g. inA. aculeataandR. ambigua, may result from self‐linkage of additional microtubules around centroplast‐nucleated “starter microtubules,” the smaller “closed” arrays with specified microtubule number, e.g. inA. pectinataandH. marina, favor a template‐driven linkage mechanism. The centroplast is a highly complex microtubule organizing center involved in the control of orientation, number, and diameter of the axonemes. Its shell may serve as a surface upon which the microtubule nucleating sites assemble, but how the precise positioning of these sites occurs is still open to debate. Some of the unsolved problems of microtubule pattern formation may be explained by the “linker nucleation hypothesis” which is an extension of the “gradion hypothesis” by Roth et al. It is shown how both the formation of closed arrays and the balanced lateral growth of open arrays may result from linker‐ind
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