PMC:1624833 / 25680-26991 JSONTXT

{"project":"2_test","denotations":[{"id":"16952321-12399584-1695226","span":{"begin":102,"end":104},"obj":"12399584"},{"id":"16952321-14555958-1695227","span":{"begin":149,"end":151},"obj":"14555958"}],"text":"The two protein-DNA datasets we study correspond to the growth of S. cerevisiae cells in rich medium [31] and to growth under exposure to rapamycin [30], a condition that mimics nutrient starvation. We restricted our attention to transcription factors studied in both papers. We ran our implementation of the Apriori algorithm [32] that computes closed biclusters (as defined in Section 1) on both these datasets, applied our layout algorithm on biclusters with at least two genes and at least two transcription factors, and obtained the layout in Figure 4(a). Biclusters obtained from the data under growth in rich medium are shown as blue boxes and rapamycin-induced biclusters are shown as red boxes. A cell in the figure is dark grey (respectively, light grey) if the transcription factor binds to the gene's promoter in both (respectively, one) condition. The image strikingly demonstrates that under exposure to rapamycin, the transcriptional regulatory network activated in the cell is very different from the network activated under growth in rich medium. The rich medium data contains only four biclusters involving these transcription factors while the rapamycin data contains 38 biclusters. We conclude that very few genes are co-regulated by the same set of transcription factors in both conditions."}