Association of adipogenic genes with SC-35 domains during porcine adipogenesis

被引:31
作者
Szczerbal, Izabela [1 ]
Bridger, Joanna M. [2 ]
机构
[1] Poznan Univ Life Sci, Dept Genet & Anim Breeding, PL-60637 Poznan, Poland
[2] Brunel Univ, Sch Hlth Sci & Social Care, Lab Nucl & Genom Hlth, Ctr Cell & Chromosome Biol, London UB8 3PH, England
关键词
adipogenesis; gene positioning; genome organization; gene clustering; nuclear organization; pig; SC-35; domains; ACTIVE GENES; TRANSCRIPTION FACTORIES; NUCLEAR SPECKLES; SPLICING FACTORS; MESSENGER-RNA; LOCUS; ORGANIZATION; ARRANGEMENTS; TRANSPORT;
D O I
10.1007/s10577-010-9176-1
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
070307 [化学生物学]; 071010 [生物化学与分子生物学];
摘要
Spatial organization of the genome within interphase nuclei is non-random. It has been shown that not only whole chromosomes but also individual genes occupy specific nuclear locations and these locations can be changed during different processes like differentiation or disease. Using a porcine in vitro adipogenesis stem cell differentiation system as a model to study nuclear organization, it was demonstrated that nuclear position of selected genes involved in porcine adipogenesis was altered with the up-regulation of gene expression, correlating with these genes becoming more internally located within nuclei, without whole territory relocation. Here, we investigated whether the gene relocation observed during porcine adipogenesis is related to spatial co-association with SC-35 domains. These domains are nuclear speckles enriched in numerous splicing and RNA metabolic factors. Using a DNA immuno-FISH approach we investigated the localisation of three adipogenic genes (PPARG, SREBF1, and FABP4) with SC-35 domains in porcine mesenchymal stem cells and after they were differentiated into adipocytes. We found that the location of these genes relative to SC-35 domains was non-random and correlated with the up-regulation of gene expression. In addition, we observed more frequent clustering of the studied genes located on different chromosomes around the same nuclear speckle in differentiated adipocytes than in mesenchymal stem cells. However, the choice of the domain was more random. This study adds to the evidence that SC-35 domains are hubs of gene activity and gene-domain association may be considered as a common mechanism to enhance gene expression.
引用
收藏
页码:887 / 895
页数:9
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