Abstract: Transcription is one of the basic processes of gene expression,
controlled by a complex network of biochemical reactions. Despite its
importance, most work on the visualisation of biochemical networks focuses on
the representation of metabolic pathways. The visualisation of the complex
networks controlling transcription requires the implementation of a
hierarchical approach that allows the display of the structure of each
regulatory region with its transcription factors and regulated operons. This
paper presents a web-based application for the visualisation of transcriptional
control networks. It takes as case study the organism Escherichia coli. The
definition of the visual components implemented is mainly based on those
proposed by Shen-Orr et al., 2002, slightly extended to visualise complex
networks.