Re: What are the causes of cyclosis?

I'm not sure if you mean nuclear cyclosis or cytoplasmic cyclosis, or both.  
The latter is found in a number of plant and protist cells (including some 
Paramecium) and is caused by motor proteins (like dynein or kinesin) 
attached to vesicles, chloroplasts, mitochondria, etc. that "walk" along a 
parallel circumferential band of either microtubules or microfilaments (or 
both).
For example, think of microtubules as a cog railroad, with the train 
pulling itself up via two intermeshing gears.  
This motor-protein induced movement is, of course, energized by ATP 
hydrolysis.
What is cytoplasmic cyclosis good for?  I honestly don't know; I have seen 
it in a long, slender, pencil-shaped diatom called Rhizosolenia, in which 
the diatoms constantly move from right to left and then back across the 
length of the cell.  (I have not seen it in any other type of diatom.)  
Perhaps cyclosis works to keep the cell contents in a dispersed state, so 
that when the cell divides in half each cell gets roughly half of its 
chloroplasts, etc.  (Cyclosis continues all through mitosis; even when the 
two daughter cells have nearly pinched off into two separate cells, the 
chloroplasts keep moving from cell to cell until the last moment.)

I have also been privileged to see Nuclear cyclosis in a group of 
microscopic marine phytoplanktonic flagellates called dinoflagellates.  
This happens during some stage of meiosis (during which a 2N zygote 
generates 4 1N cells).  The nucleus (or probably, just the inside of the 
nucleus, not including the rER-linked nuclear envelope) rotates constantly 
during this phase, driven by not-yet determined motor proteins.  The sight 
is quite amazing, reminding me of a mystical world rotating within a cell 
(remember, in Men in Black, the galaxy in Orion's belt?)
I don't know if anyone understands the function of this "dance of the chrom 
osomes"; does it help them arrange themselves, to find some binding site on 
the inside of the nucleus?  All I know is that it is a beautiful, 
mysterious sight, something few people have ever seen.

I hope I have adequately answered your question.