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Although the spatial location of genes within the nucleus has been implicated in their transcriptional status, little is known about the dynamics of gene location that accompany large-scale changes in gene expression. The mating of haploid yeast Saccharomyces cerevisiae is accompanied by a large-scale change in transcription and developmental program. We examined changes in nuclear organization that accompany stimulus by the mating pheromone alpha factor and found that most alpha-factor-induced genes become associated with components of the nuclear envelope. The myosin-like protein Mlp1, which has been implicated in mRNA export, was further shown to exhibit RNA dependence in its association with alpha-factor-induced genes. High-resolution mapping of association of chromosome III with Mlp1 revealed alpha-factor-dependent determinants of nuclear pore association, including origins of replication, specific intergenic regions, and the 3' ends of transcriptionally activated genes. Taken together, these results reveal RNA- and DNA-dependent determinants of nuclear organization as well as a detailed picture of how an entire chromosome alters its spatial conformation in response to a developmental cue.

Developmentally induced changes in transcriptional program alter spatial organization across chromosomes