Summary
Two histone H3 genes have been cloned from a λgtWESλ.B corn genomic library. The nucleotide sequences show 96% homology and both encode the same protein, which differs from its counterpart in wheat and pea by one amino acid substitution. The 5′-flanking regions of the two corn H3 genes contain the classical histone-gene-specific consensus sequences and possess several regions of extensive nucleotide homology. A conserved octanucleotide 5′-CGCGGATC-3′ occurs at approximately 200 nucleotides upstream from the initiation ATG codon. This octanucleotide was found to exist in all of the 7 plant histone genes sequenced so far. Codon usage is characterized by a very high frequency of C (67%) and G (28%) at the third position of the codons, those ending by A (1%) and T (4%) being practically excluded.
Comparison of Southern blots of EcoRI, EcoRV and BamHI digested genomic DNA suggests that the corn H3 and H4 genes are not closely associated. The H3 genes exist as 60 to 80 copies and the H4 genes as 100 to 120 copies per diploid genome. re]19851002 rv]19851212 ac]19851216
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Chaubet, N., Philipps, G., Chaboute, ME. et al. Nucleotide sequences of two corn histone H3 genes. Genomic organization of the corn histone H3 and H4 genes. Plant Mol Biol 6, 253–263 (1986). https://doi.org/10.1007/BF00015231
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DOI: https://doi.org/10.1007/BF00015231