The Ontogeny of Chromosome and Chromonema Spirals A Re-evaluation

Wilson, G. B.; Coleman, P. G.

doi:10.1508/cytologia.17.270

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The Mitotic and Meiotic Programs Comprise Global Cycles Of C1

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2009

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Cited by 5 publications

(1 citation statement)

References 15 publications

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“…21 and Fig. 6), as also seen in Tradescantia (22). The prophase͞prometaphase͞metaphase progression is also seen in ultrastructural chromatin fiber studies (23).…”

Section: The Mitotic and Meiotic Programs Comprise Global Cycles Of Csupporting

confidence: 65%

A mechanical basis for chromosome function

Kleckner

Zickler

Jones

et al. 2004

Proc. Natl. Acad. Sci. U.S.A.

290

365

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“…21 and Fig. 6), as also seen in Tradescantia (22). The prophase͞prometaphase͞metaphase progression is also seen in ultrastructural chromatin fiber studies (23).…”

Section: The Mitotic and Meiotic Programs Comprise Global Cycles Of Csupporting

confidence: 65%

A mechanical basis for chromosome function

Kleckner

Zickler

Jones

et al. 2004

Proc. Natl. Acad. Sci. U.S.A.

290

365

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Expression of chirality in columnar hexagonal phases or DNA and nucleosomes

Leforestier

Bertin

Dubochet

et al. 2008

Comptes Rendus. Chimie

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It is surprising to see how eukaryotic chromosomes or sperm nuclei are highly condensed chromatin materials and how they can sometimes present spectacular helical morphologies. We may suspect that these helical shapes originate from the chiral properties of DNA and other components of chromatin. Dense solutions of DNA and nucleosomes can be prepared in vitro to reproduce some of the characteristics of chromatin. They form multiple ordered phases, either mesophases or 3D crystals, that can be useful to analyze precisely how chiral structures can emerge, or not, from interactions between these constitutive elements. We address the question of the competition between twist and hexagonal packing in dense states of DNA, nucleosomes, chromatin and chromosomes. From the microscopic analysis of many examples, we show how the twist arising from the chirality of the objects can be diluted in the phase and/or expelled along twist walls. These walls are either parallel or normal to the direction of the columns. In the first case, we determine that the twist axis lies parallel to one q 2 direction of the hexagonal network. Helical shapes of chromosomes and bundles of DNA and chromatin may also be consequences of this competition, as illustrated here.

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Effect of high temperature on meiosis in Lolium: Nucleolar inactivation

Jain

1957

Heredity

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The Ontogeny of Chromosome and Chromonema Spirals A Re-evaluation

Cited by 5 publications

References 15 publications

A mechanical basis for chromosome function

A mechanical basis for chromosome function

Expression of chirality in columnar hexagonal phases or DNA and nucleosomes

Effect of high temperature on meiosis in Lolium: Nucleolar inactivation

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