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The statistical geometry of transcriptome divergence in cell-type evolution and cancer

  1. Lab of environmental epigenetics
  2. Publications

 

 

The statistical geometry of transcriptome divergence in cell-type evolution and cancer

by Cong Liang, FANTOM Consortium; Alistair R R Forrest
Year: 2015 DOI: 10.1038/ncomms7066

Extra Information

  • PMID: 25585899
  •  
  • DOI: 10.1038/ncomms7066

Abstract

In evolution, body plan complexity increases due to an increase in the number of individualized cell types. Yet, there is very little understanding of the mechanisms that produce this form of organismal complexity. One model for the origin of novel cell types is the sister cell-type model. According to this model, each cell type arises together with a sister cell type through specialization from an ancestral cell type. A key prediction of the sister cell-type model is that gene expression profiles of cell types exhibit tree structure. Here we present a statistical model for detecting tree structure in transcriptomic data and apply it to transcriptomes from ENCODE and FANTOM5. We show that transcriptomes of normal cells harbour substantial amounts of hierarchical structure. In contrast, cancer cell lines have less tree structure, suggesting that the emergence of cancer cells follows different principles from that of evolutionary cell-type origination.
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