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Nucleotide sequences of two corn histone H3 genes. Genomic organization of the corn histone H3 and H4 genes

✍ Scribed by Nicole Chaubet; Gabriel Philipps; Marie-Edith Chaboute; Martine Ehling; Claude Gigot

Publisher: Springer
Year: 1986
Tongue: English
Weight: 851 KB
Volume: 6
Category: Article
ISSN: 0167-4412
DOI: 10.1007/bf00015231

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✦ Synopsis

Two histone H3 genes have been cloned from a XgtWESX.B corn genomic library. The nucleotide sequences show 96°7o 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 (67O7o) and G (28°7o) at the third position of the codons, those ending by A (1%) and T (4O/o) 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.

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