Characterization and modification of heterochromatin in four species of the immigrans species group of Drosophila

Gupta Jp, Arun Kumar
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引用次数: 3

Abstract

The distribution of constitutive heterochromatin in mitotic chromosomes of four species (viz., Drosophila quadrilineata de Meijere, D. immigrans Sturtevant, D. pulaua Wheeler, and D. kohkoa Wheeler) was studied using C-banding and fluorescence staining techniques. The results of this study had revealed that the heterochromatic segments detected by C-banding in the species under study were found to coincide precisely with the areas giving bright fluorescence with the two fluorochromes, Hoechst 33258 and quinacrine. This suggested the presence of A–T rich base pairs in their heterochromatin. These studies further revealed that the modification of heterochromatin caused due to the additions or deletions in particular had also played a very significant role during the differentiation of these species.Key words: heterochromatin modification, immigrans species group, Drosophila.
果蝇4个迁徙种群的异染色质特征及修饰
采用c带和荧光染色技术研究了四种果蝇(Drosophila quadrilineata de Meijere, D. emigans Sturtevant, D. pulaua Wheeler和D. kohkoa Wheeler)有丝分裂染色体的组成异染色质分布。本研究结果表明,在所研究的物种中,通过c带检测到的异色片段与两种荧光染料Hoechst 33258和quinacrine发出明亮荧光的区域完全重合。这表明在它们的异染色质中存在富含A-T的碱基对。这些研究进一步揭示了异染色质的修饰,特别是由添加或缺失引起的异染色质修饰在这些物种的分化过程中也发挥了非常重要的作用。关键词:异染色质修饰;迁徙种群;果蝇
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