Abstract
Forkhead Box (Fox) DNA binding proteins control multiple genome activities, including transcription, replication, and repair. These activities are organized spatially and temporally in the nucleus, and Fox proteins Fkh1 and Fkh2 have emerged as regulators of long-range chromosomal interactions involved with these activities, such as the clustering of replication origins programmed for early initiation. Fkh1 and Fkh2 bind a subset of replication origins and are thought to dimerize to mediate long-range chromosomal contacts between these origins. The binding of Fkh1 and/or Fkh2 (Fkh1/2) to replication origins and the recombination enhancer (RE), which is involved in DNA repair required for mating-type switching, is cell cycle-regulated and thus appears to be more dynamic than Fkh1/2 binding at regulated target genes. Here we report the identification of Fkh1/2 binding sequence variants at replication origins and the RE compared with Fkh1/2 binding sequences found at target genes of the CLB2 group. These different binding sequences have previously been characterized as weak and strong, respectively, suggesting that the presence of weak sites contributes to more dynamic interactions at replication origins and RE, possibly facilitat...Continue Reading
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