Molecular evolution of the nontandemly repeated genes of the histone 3 multigene family.

In some species, histone gene clusters consist of tandem arrays of each type of histone gene, whereas in other species the genes may be clustered but not arranged in tandem. In certain species, however, histone genes are found scattered across several different chromosomes. This study examines the evolution of histone 3 (H3) genes that are not arranged in large clusters of tandem repeats. Although H3 amino acid sequences are highly conserved both within and between species, we found that the nucleotide sequence divergence at synonymous sites is high, indicating that purifying selection is the major force for maintaining H3 amino acid sequence homogeneity over long-term evolution. In cases where synonymous-site divergence was low, recent gene duplication appeared to be a better explanation than gene conversion. These results, and other observations on gene inactivation, organization, and phylogeny, indicated that these H3 genes evolve according to a birth-and-death process under strong purifying selection. Thus, we found little evidence to support previous claims that all H3 proteins, regardless of their genome organization, undergo concerted evolution. Further analyses of the structure of H3 proteins revealed that the histones of higher eukaryotes might have evolved from a replication-independent-like H3 gene.

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