Transcriptional regulators Proteins that bind to specific promoter sequences in genome Regulate genome expression and its maintenance Cell cycle, environment changes, replication, condensation, cohesion, etc.
Genome wide location analysis Crosslink protein to DNA in vivo with formaldehyde Break open cells and shear DNA Immunoprecipitate Reverse-crosslinks, blunt DNA and ligate to unidirectional linkers LM-PCR Labeling Hybridize to array Ren B et al, 2004
Procedure They tested the binding by GWLA: 203 (84) DNA transcriptional regulators in rich media -> 11,000 unique interactions between regulators and promoter regions at high confidence (P<0.001)
Yeast transcriptional regulatory map
3,353 interactions within 1,296 promoter regions
Regulator binding behaviour
Summary Construction of the yeast transcriptional regulatory map Promoter architectures Patterns of regulator binding behaviour