基因关联:是浪漫邂逅还是核邻域中的偶然相遇?
Gene associations: true romance or chance meeting in a nuclear neighborhood?
作者信息
Lawrence Jeanne B, Clemson Christine M
机构信息
Department of Cell Biology, University of Massachusetts Medical Center, Worcester, MA 01655, USA.
出版信息
J Cell Biol. 2008 Sep 22;182(6):1035-8. doi: 10.1083/jcb.200808121.
Many recent studies have raised interest in the nuclear associations of coregulated genes from different chromosomes, often evoking interpretations of gene-gene interactions, communication, and even "romance." However, in some cases, the associations may be indirect and infrequent and may reflect the segregation of active and inactive genes into different nuclear compartments. The study by Brown et al. (see p. 1083 of this issue) reports that the apparent association of erythroid genes is not a direct interaction nor colocalization to one tiny transcription factory but arises as a result of the known clustering of many active genes with larger splicing factor-rich speckles (a.k.a., SC35-defined domains). This clustering appears largely stochastic but is impacted by the chromosomal neighborhood of the gene as well as its transcriptional status. The study adds a new twist by examining the same gene in a foreign chromosomal context, providing evidence that this impacts a gene's propensity to form gene-domain (or apparent gene-gene) associations within nuclei.
最近的许多研究引发了人们对来自不同染色体的共调控基因的核关联的兴趣,这常常引发对基因-基因相互作用、交流甚至“浪漫关系”的解读。然而,在某些情况下,这种关联可能是间接且不常见的,可能反映了活跃基因和非活跃基因在不同核区室中的分离。布朗等人的研究(见本期第1083页)报告称,红系基因的明显关联并非直接相互作用,也不是共定位于一个微小的转录工厂,而是由于许多活跃基因与富含剪接因子的较大斑点(即SC35定义的结构域)的已知聚集而产生的。这种聚集在很大程度上似乎是随机的,但受到基因的染色体邻域及其转录状态的影响。该研究通过在异源染色体背景下研究同一基因增加了新的看点,提供了证据表明这会影响基因在细胞核内形成基因-结构域(或明显的基因-基因)关联的倾向。
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