Similar active genes cluster in specialized transcription factories.

Similar active genes cluster in specialized transcription factories.
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DOI:
10.1083/jcb.200710053
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发表时间:
2008-05-19
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Cook PR
Cook PR
中科院分区:
其他
文献类型:
--
作者:
Xu M;Cook PR

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转录如何影响特定基因在细胞核内的排列方式仍有待完全了解。我们在这里检查转录是否发生在包含所需机制的离散位置(工厂),以及这些位置是否专门转录不同的基因。我们将编码相同复制起点但不同转录单位的质粒共转染成细胞,在那里它们被组装成微小染色体,细胞机器复制和转录这些微小染色体。在含有数千个微小染色体的细胞中,我们发现(使用荧光原位杂交)活性模板仅集中在少数工厂,这些工厂根据启动子类型和内含子的存在转录特定的单位。无论是在两个不同的微染色体上,还是在宿主染色体和微染色体上,相似的转录单位之间的接近程度都通过染色体构象捕获得到了证实。我们的结论是,工厂专门生产一种特定类型的转录本,这取决于启动子类型和基因是否包含内含子。
How transcription affects the way specific genes are arranged within the nucleus remains to be fully understood. We examine here whether transcription occurs in discrete sites (factories) containing the required machinery and whether these sites specialize in transcribing different genes. We cotransfected plasmids encoding a common origin of replication but different transcription units into cells, where they are assembled into minichromosomes that the cellular machinery replicates and transcribes. In cells containing thousands of minichromosomes, we found (using fluorescence in situ hybridization) active templates concentrated in only a few factories that transcribe particular units depending on the promoter type and the presence of an intron. Close proximity between similar transcription units, whether on two different minichromosomes or on host chromosomes and minichromosomes, is confirmed using chromosome conformation capture. We conclude that factories specialize in producing a particular type of transcript depending on promoter type and whether or not the gene contains an intron.
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