DOUBLE HELICAL ARRANGEMENT OF SPREAD DINOFLAGELLATE CHROMOSOMES
DOUBLE HELICAL ARRANGEMENT OF SPREAD DINOFLAGELLATE CHROMOSOMES
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DOI：
10.1007/bf00327568
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发表时间：
1980-01-01
期刊：
影响因子：
1.6
通讯作者：
BOULIGAND, Y
中科院分区：
文献类型：
--
作者：
LIVOLANT, F;BOULIGAND, Y
甲藻的染色体在薄片上呈现出规则的排列模式，这与DNA的液晶螺旋排列相对应。周围的DNA丝在周围的核质中形成环系统。当这种染色体（在海洋原甲藻中研究）在水的存在下，它们大大延长，形成一个双螺旋束。在这些束的外围，可以观察到许多细丝，这些细丝是光滑的，没有核小体;它们的直径是恒定的。这项研究，在相衬和EM，允许统计测量。提出了一个几何模型，并显示了最简单的方法，从完整的扩展形式。染色体的液晶特性可能与延伸机制有关。
Dinoflagellate chromosomes observed in thin section show regular patterns which have been shown to correspond to a liquid crystalline helicoidal arrangement of DNA. Peripheral DNA filaments form a system of loops in the surrounding nucleoplasm. When such chromosomes (studied in Prorocentrum micans) are in presence of water, they extend considerably and form a double helical bundle. At the periphery of these bundles, one observes numerous filaments, which are smooth and devoid of nucleosomes; their diameter is constant. This study, in phase contrast and in EM, allows statistical measurements. A geometrical model is proposed and shows the simplest way to pass from the intact to the extended form. The liquid crystalline character of the chromosome is probably involved in the extension mechanisms.