Sloan-Kettering Institute, New York, NY 12750, USA. whitehoi@mskcc.org
Recent mapping of nucleosome positioning has added a new dimension to the study of transcriptional regulation. Hartley and Madhani (2009) now demonstrate the power of this approach and show that a chromatin regulator alters nucleosome positioning in the promoters of a large number of genes in the budding yeast Saccharomyces cerevisiae.