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Mapping epigenetic modifications on chicken lampbrush chromosomes.
Molecular Cytogenetics ( IF 1.3 ) Pub Date : 2020-08-03 , DOI: 10.1186/s13039-020-00496-0
Tatiana Kulikova 1 , Anna Surkova 1 , Anna Zlotina 1 , Alla Krasikova 1
Affiliation  

The epigenetic regulation of genome is crucial for implementation of the genetic program of ontogenesis through establishing and maintaining differential gene expression. Thus mapping of various epigenetic modifications to the genome is relevant for studying the regulation of gene expression. Giant transcriptionally active lampbrush chromosomes are an established tool for high resolution physical mapping of the genome and its epigenetic modifications. This study is aimed at characterizing the epigenetic status of compact chromatin domains (chromomeres) of chicken lampbrush macrochromosomes. Distribution of three epigenetic modifications – 5-methylcytosine, histone H3 trimethylated at lysine 9 and hyperacetylated histone H4 – along the axes of chicken lampbrush chromosomes 1–4, Z and W was analyzed in details. Enrichment of chromatin domains with the investigated epigenetic modifications was indicated on the cytological chromomere-loop maps for corresponding chicken lampbrush chromosomes. Heterogeneity in the distribution of 5-methylcytosine and histone H3 trimethylated at lysine 9 along the chromosome axes was revealed. On examples of certain chromomeres of chicken lampbrush chromosomes 1, 3, 4 and W we demonstrated that a combination of immunofluorescent staining and fluorescence in situ hybridization allows to relate the epigenetic status and a DNA sequence context of individual chromomeres.

中文翻译:

绘制鸡灯刷染色体上的表观遗传修饰。

通过建立和维持差异基因表达,基因组的表观遗传调控对于个体发生的遗传程序的实施至关重要。因此,将各种表观遗传修饰映射到基因组与研究基因表达的调节有关。巨大的转录活性灯刷染色体是对基因组及其表观遗传修饰进行高分辨率物理作图的既定工具。本研究旨在表征鸡灯刷大染色体致密染色质结构域(染色体)的表观遗传状态。详细分析了三种表观遗传修饰——5-甲基胞嘧啶、组蛋白 H3 在赖氨酸 9 处三甲基化和高乙酰化组蛋白 H4——沿鸡灯刷染色体 1-4、Z 和 W 的轴的分布。染色质结构域与所研究的表观遗传修饰的富集在相应的鸡灯刷染色体的细胞学染色体环图上显示。揭示了沿染色体轴在赖氨酸 9 处三甲基化的 5-甲基胞嘧啶和组蛋白 H3 分布的异质性。在鸡灯刷染色体 1、3、4 和 W 的某些染色体的例子中,我们证明了免疫荧光染色和荧光原位杂交的组合允许将单个染色体的表观遗传状态和 DNA 序列背景联系起来。揭示了沿染色体轴在赖氨酸 9 处三甲基化的 5-甲基胞嘧啶和组蛋白 H3 分布的异质性。在鸡灯刷染色体 1、3、4 和 W 的某些染色体的例子中,我们证明了免疫荧光染色和荧光原位杂交的组合允许将单个染色体的表观遗传状态和 DNA 序列背景联系起来。揭示了沿染色体轴在赖氨酸 9 处三甲基化的 5-甲基胞嘧啶和组蛋白 H3 分布的异质性。在鸡灯刷染色体 1、3、4 和 W 的某些染色体的例子中,我们证明了免疫荧光染色和荧光原位杂交的组合允许将单个染色体的表观遗传状态和 DNA 序列背景联系起来。
更新日期:2020-08-03
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