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The substructural organization of the chromosome core (scaffold) in meiotic chromosomes of Trilophidia annulata

Published online by Cambridge University Press:  14 April 2009

Jian Zhao ,
Shaobo Jin  and
Shui Hao
Jian Zhao
Affiliation:
Institute of Genetics and Cytology, Northeast Normal University, Changchun 130024, China. Institute of Hematology, Harbin First Hospital, Harbin 150010, China
Shaobo Jin*
Affiliation:
Institute of Genetics and Cytology, Northeast Normal University, Changchun 130024, China.
Shui Hao
Affiliation:
Institute of Genetics and Cytology, Northeast Normal University, Changchun 130024, China.
*
* Corresponding author.
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The substructural organization of chromosome cores or nonhistone proteins was studied within intact metaphase chromosomes at the second meiotic division in the grasshopper Trilophidia annulata by silver staining as well as light microscopy and whole mount electron microscopy of squash chromosomes. Our results revealed that the metaphase II chromosome contains a longitudinal, helical coiling core structure. Probably the two last organizational levels of the core packaging are achieved by helical coiling. The core structure retains the morphological characteristics of the original metaphase chromosome, surrounded by a halo of dispersed materials, which may be composed mainly of nonhistone proteins. The kinetochore is found to be connected with the chromosome core. The present findings combined with our previous observations on the helical structure of metaphase II chromosomes suggest that the folding path of the internal core structure in metaphase chromosomes is consistent with the final helical arrangement of the chromosome itself. These observations also imply that in condensed metaphase chromosomes nonhistone protein may form a compact network structure with helical appearance, which extends throughout the entire chromosome.

Type
Research Article
Information
Genetics Research , Volume 64 , Issue 3 , December 1994 , pp. 209 - 215
Copyright
Copyright © Cambridge University Press 1994

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