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Mol. Cell. Biol., Apr 1995, 1999-2009, Vol 15, No. 4
Copyright © 1995, American Society for Microbiology

A new class of histone H2A mutations in Saccharomyces cerevisiae causes specific transcriptional defects in vivo

JN Hirschhorn, AL Bortvin, SL Ricupero-Hovasse and F Winston
Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115.

Nucleosomes have been shown to repress transcription both in vitro and in vivo. However, the mechanisms by which this repression is overcome are only beginning to be understood. Recent evidence suggests that in the yeast Saccharomyces cerevisiae, many transcriptional activators require the SNF/SWI complex to overcome chromatin-mediated repression. We have identified a new class of mutations in the histone H2A-encoding gene HTA1 that causes transcriptional defects at the SNF/SWI-dependent gene SUC2. Some of the mutations are semidominant, and most of the predicted amino acid changes are in or near the N- and C-terminal regions of histone H2A. A deletion that removes the N-terminal tail of histone H2A also caused a decrease in SUC2 transcription. Strains carrying these histone mutations also exhibited defects in activation by LexA-GAL4, a SNF/SWI-dependent activator. However, these H2A mutants are phenotypically distinct from snf/swi mutants. First, not all SNF/SWI-dependent genes showed transcriptional defects in these histone mutants. Second, a suppressor of snf/swi mutations, spt6, did not suppress these histone mutations. Finally, unlike in snf/swi mutants, chromatin structure at the SUC2 promoter in these H2A mutants was in an active conformation. Thus, these H2A mutations seem to interfere with a transcription activation function downstream or independent of the SNF/SWI activity. Therefore, they may identify an additional step that is required to overcome repression by chromatin.


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