Figure 2. Gene expression patterns translate regulatory changes into networks links.
Gene expression patterns can change in several ways between control and disease samples, beyond standard differential expression (purple line). The variance of a gene’s expression may be altered in disease with or without differential expression (red gene expression profile) (Ho et al., 2008). Similarly altered gene-gene correlations in disease can occur with or without changes in expression (Hudson et al., 2009). A potential mechanism mediating the loss of gene-gene correlations in the disease state, through disrupted transcription factor (TF) binding, is shown on the right.