Yeast H3 and H4 histone messenger RNAs are transcribed from two non-allelic gene sets
- PMID: 6313932
- DOI: 10.1016/s0022-2836(83)80163-6
Yeast H3 and H4 histone messenger RNAs are transcribed from two non-allelic gene sets
Abstract
The genes coding for the H3 and H4 histones of Saccharomyces cerevisiae have been isolated by recombinant DNA cloning. The genes were detected in a bacteriophage lambda library of the yeast genome by hybridization with plasmids containing the cloned Psammechinus miliaris sea urchin histone genes (pCH7) and the cloned Drosophila histone genes (cDM500). Two non-allelic sets of the H3 and H4 genes have been isolated. Each set consists of one H3 gene and one H4 gene arranged as a divergently transcribed pair separated by an intergene spacer DNA. The histone genes were located on the cloned yeast fragments by S1 nuclease mapping, as was a gene (SMT1) of unknown function that does not code for a histone but is closely linked to one of the histone sets. Sequence homology between the two non-allelic sets is confined to the coding regions of the respective genes while the flanking DNA and intergene spacer DNA are extensively divergent. Cellular RNA homologous to the histone genes, including transcribed non-coding sequences unique to each of the four genes, was detected by S1 mapping, thus demonstrating that all four genes are transcribed in vegetative cells.
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