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Genetics, Vol 128, 729-738, Copyright © 1991
INVESTIGATIONS |
Histone Regulatory (hir) Mutations Suppress {delta} Insertion Alleles in Saccharomyces cerevisiae
P. W. Sherwood and M. A. Osley
Program in Molecular Biology, Sloan Kettering Cancer Center, and Cornell University Graduate School of Medical Sciences, New York, New York 10021
Changes in histone gene dosage as well as mutations within some histone genes suppress {delta} insertion mutations in the HIS4 and LYS2 loci of Saccharomyces cerevisiae by altering the site of transcription initiation. We have found that three histone regulatory (hir) mutations, identified by their effects on the regulation of histone gene expression, suppress the same insertion mutations. In addition, we have examined whether any previously identified spt (suppressor of Ty) mutations might suppress the {delta} insertion alleles because of effects on histone gene regulation. Our results demonstrate that mutations in the histone genes SPT11/HTA1 and SPT12/HTB1 and in three other SPT genes, SPT1, SPT10 and SPT21, confer Hir(-) phenotypes. The spt1 mutation was found to be an allele of HIR2 while the spt10 and spt21 mutations are not in any of the known HIR genes.
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