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首页> 外文期刊>Journal of genetics >Distinct classical and molecular cytogenetics of Astyanax marionae and A-fasciatus (Characiformes: Characidae): a comparative study of the organization of heterochromatin and repetitive genes
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Distinct classical and molecular cytogenetics of Astyanax marionae and A-fasciatus (Characiformes: Characidae): a comparative study of the organization of heterochromatin and repetitive genes

机译：Astyanax Marionae和A-Fasciatus（Characiformes：characidae）的不同的古典和分子细胞源性：杂蛋白和重复基因组织的比较研究

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摘要

Genus Astyanax is well distributed in Neotropical freshwater environments and its taxonomic position is uncertain, as is the case with other Characidae genera allocated in the group incertae sedis. This study aimed to analyse the karyotype of different populations of Astyanax fasciatus (Corumbatai River basin) using Giemsa staining, C-band technique, and fluorescence in situ hybridization for the H3 histone and 5S rRNA genes, in addition we describe for the first time the chromosomal organization of H3 histone and 5S rRNAgenes in A. marionae (Paraguay River basin). Chromosomes of three A. fasciatus populations were analysed (two with 2n = 50 and one with 2n = 48) and the heterochromatin was organized in two forms (blocks with blurred boundaries and distinct blocks). H3 histone and 5S rRNA genes were observed in all the three populations of A. fasciatus on two chromosome pairs (one metacentric chromosome showing H3 histone and 5S rRNA gene clusters). In A. marionae (2n = 48), H3 histone and 5S rRNA genes were observed in one acrocentric chromosome pair (different pairs). Further, differences between karyotypes and heterochromatin, as well as the chromosomal organization of H3 histone and 5S rRNA genes in Astyanax species, focussing on chromosome evolution in the group are discussed.
机译：Astyanax属在崭新教淡水环境中分布得很好，其分类立场是不确定的，就像其他Characidae属的情况一样，Chenertae Sedis群体分配。本研究旨在利用Giemsa染色，C波段技术和5S rRNA基因的原位杂交，荧光分析不同群体的凯西氏菌（Corumbatai River盆地）的核型。除了第一次描述H3组蛋白和5S rrnagenes的染色体组织在A. Marionae（巴拉圭河流域）。分析了三种染色体的染色体（用2N = 50且含有2n = 48的两个），并以两种形式组织异铬胺（具有模糊的边界和明显嵌段的嵌段）。在两种染色体对的所有三种群体中观察到H3组蛋白和5S rRNA基因（显示H3组蛋白和5S rRNA基因簇的一个态染色体）。在A. marionae（2n = 48）中，在一种上注染色体对（不同对）中观察到H3组蛋白和5S rRNA基因。此外，讨论了核型和异铬酰胺之间的差异，以及在哮喘物种中，侧重于本组中的染色体演化的H3组蛋白和5S rRNA基因的H3组蛋白和5S rRNA基因的染色体组织。

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