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Generation of a Synthetic Human Chromosome with Two Centromeric Domains for Advanced Epigenetic Engineering Studies.
ACS Synthetic Biology ( IF 3.7 ) Pub Date : 2018-03-29 , DOI: 10.1021/acssynbio.8b00018
Elisa Pesenti 1 , Natalay Kouprina 2 , Mikhail Liskovykh 2 , Joan Aurich-Costa 3 , Vladimir Larionov 2 , Hiroshi Masumoto 4 , William C Earnshaw 1 , Oscar Molina 1, 5
Affiliation  

It is generally accepted that chromatin containing the histone H3 variant CENP-A is an epigenetic mark maintaining centromere identity. However, the pathways leading to the formation and maintenance of centromere chromatin remain poorly characterized due to difficulties of analysis of centromeric repeats in native chromosomes. To address this problem, in our previous studies we generated a human artificial chromosome (HAC) whose centromere contains a synthetic alpha-satellite (alphoid) DNA array containing the tetracycline operator, the alphoidtetO-HAC. The presence of tetO sequences allows the specific targeting of the centromeric region in the HAC with different chromatin modifiers fused to the tetracycline repressor. The alphoidtetO-HAC has been extensively used to investigate protein interactions within the kinetochore and to define the epigenetic signature of centromeric chromatin to maintain a functional kinetochore. In this study, we developed a novel synthetic HAC containing two alphoid DNA arrays with different targeting sequences, tetO, lacO and gal4, the alphoidhybrid-HAC. This new HAC can be used for detailed epigenetic engineering studies because its kinetochore can be simultaneously or independently targeted by different chromatin modifiers and other fusion proteins.

中文翻译:

用于高级表观遗传工程研究的具有两个着丝粒域的合成人类染色体的生成。

人们普遍认为,含有组蛋白 H3 变体 CENP-A 的染色质是一种保持着丝粒身份的表观遗传标记。然而,由于难以分析天然染色体中的着丝粒重复序列,导致着丝粒染色质形成和维持的途径仍然没有得到很好的表征。为了解决这个问题,在我们之前的研究中,我们生成了一个人类人工染色体 (HAC),其着丝粒包含一个合成的 alpha 卫星 (alphoid) DNA 阵列,其中包含四环素算子,alphoidtetO-HAC。tetO 序列的存在允许使用与四环素阻遏物融合的不同染色质修饰剂特异性靶向 HAC 中的着丝粒区域。alphoidtetO-HAC 已被广泛用于研究动粒内的蛋白质相互作用,并定义着丝粒染色质的表观遗传特征以维持功能性动粒。在这项研究中,我们开发了一种新型合成 HAC,其中包含两个具有不同靶向序列、tetO、lacO 和 gal4(alphoidhybrid-HAC)的 alphoid DNA 阵列。这种新的 HAC 可用于详细的表观遗传工程研究,因为它的动粒可以同时或独立地被不同的染色质修饰剂和其他融合蛋白靶向。
更新日期:2018-03-22
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