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Chromatin States Accurately Classify Cell Differentiation Stages

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  • Jessica L Larson
  • Guo-Cheng Yuan

Abstract

Gene expression is controlled by the concerted interactions between transcription factors and chromatin regulators. While recent studies have identified global chromatin state changes across cell-types, it remains unclear to what extent these changes are co-regulated during cell-differentiation. Here we present a comprehensive computational analysis by assembling a large dataset containing genome-wide occupancy information of 5 histone modifications in 27 human cell lines (including 24 normal and 3 cancer cell lines) obtained from the public domain, followed by independent analysis at three different representations. We classified the differentiation stage of a cell-type based on its genome-wide pattern of chromatin states, and found that our method was able to identify normal cell lines with nearly 100% accuracy. We then applied our model to classify the cancer cell lines and found that each can be unequivocally classified as differentiated cells. The differences can be in part explained by the differential activities of three regulatory modules associated with embryonic stem cells. We also found that the “hotspot” genes, whose chromatin states change dynamically in accordance to the differentiation stage, are not randomly distributed across the genome but tend to be embedded in multi-gene chromatin domains, and that specialized gene clusters tend to be embedded in stably occupied domains.

Suggested Citation

  • Jessica L Larson & Guo-Cheng Yuan, 2012. "Chromatin States Accurately Classify Cell Differentiation Stages," PLOS ONE, Public Library of Science, vol. 7(2), pages 1-9, February.
  • Handle: RePEc:plo:pone00:0031414
    DOI: 10.1371/journal.pone.0031414
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