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Recently, we have demonstrated a predominant association of Rad26p with the coding sequences but not promoters of several GAL genes following transcriptional induction. Here, we show that the occupancy of histone H2A-H2B dimer at the coding sequences of these genes is not altered following transcriptional induction in the absence of Rad26p. A histone H2A-H2B dimer-enriched chromatin in Δrad26 is correlated to decreased association of RNA polymerase II with the active coding sequences (and hence transcription). However, the reduced association of RNA polymerase II with the active coding sequence in the absence of Rad26p is not due to the defect in formation of transcription complex at the promoter. Thus, Rad26p regulates the occupancy of histone H2A-H2B dimer, which is correlated to the association of elongating RNA polymerase II with active GAL genes. Similar results are also found at other inducible non-GAL genes. Collectively, our results define a new role of Rad26p in orchestrating chromatin structure and hence transcription in vivo.

Rad26p regulates the occupancy of histone H2A–H2B dimer at the active genes in vivo