An organogenesis network-based comparative transcriptome analysis for understanding early human development in vivo and in vitro

BMC Systems Biology

Kankan Wang³  Ji Zhang³  Ying Jin⁴  Ying Yang⁴  Wen Jin¹  Hai Fang² 

[1] State Key Laboratory of Medical Genomics, Sino-French Research Center for Life Sciences and Genomics, Ruijin Hospital affiliated to Shanghai Jiao Tong University School of Medicine (SJTU-SM), Ruijin Rd. II, Shanghai 200025, China;Department of Computer Science, University of Bristol, Woodland Road, Bristol BS8 1UB, UK;Key Laboratory of Stem Cell Biology, Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences and SJTU-SM, 225 South Chongqing Road, Shanghai 200025, China;Shanghai Stem Cell Institute, 225 South Chongqing Road, Shanghai 200025, China

关键词: Transcriptome;    Gene set enrichment analysis;    Differentiation-relevant module;    Stemness-relevant module;    Human organogenesis;    Integrated networks;   

Others  :  1160460
DOI  :  10.1186/1752-0509-5-108

 received in 2011-04-04, accepted in 2011-07-06,  发布年份 2011

【 摘 要 】

Background

Integrated networks hold great promise in a variety of contexts. In a recent study, we have combined expression and interaction data to identify a putative network underlying early human organogenesis that contains two modules, the stemness-relevant module (hStemModule) and the differentiation-relevant module (hDiffModule). However, owing to its hypothetical nature, it remains unclear whether this network allows for comparative transcriptome analysis to advance our understanding of early human development, both in vivo and in vitro.

Results

Based on this integrated network, we here report comparisons with the context-dependent transcriptome data from a variety of sources. By viewing the network and its two modules as gene sets and conducting gene set enrichment analysis, we demonstrate the network's utility as a quantitative monitor of the stem potential versus the differentiation potential. During early human organogenesis, the hStemModule reflects the generality of a gradual loss of the stem potential. The hDiffModule indicates the stage-specific differentiation potential and is therefore not suitable for depicting an extended developmental window. Processing of cultured cells of different types further revealed that the hStemModule is a general indicator that distinguishes different cell types in terms of their stem potential. In contrast, the hDiffModule cannot distinguish between differentiated cells of different types but is able to predict differences in the differentiation potential of pluripotent cells of different origins. We also observed a significant positive correlation between each of these two modules and early embryoid bodies (EBs), which are used as in vitro differentiation models. Despite this, the network-oriented comparisons showed considerable differences between the developing embryos and the EBs that were cultured in vitro over time to try to mimic in vivo processes.

Conclusions

We strongly recommend the use of these two modules either when pluripotent cell types of different origins are involved or when the comparisons made are constrained to the in vivo embryos during early human organogenesis (and an equivalent in vitro differentiation models). Network-based comparative transcriptome analysis will contribute to an increase in knowledge about human embryogenesis, particularly when only transcriptome data are currently available. These advances will add an extra dimension to network applications.

【 授权许可】

   
2011 Fanget al; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

Figure 3.

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