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Molecular Biology and Evolution 19:689-697 (2002)
© 2002 Society for Molecular Biology and Evolution

Purifying Selection and Birth-and-death Evolution in the Histone H4 Gene Family

Helen Piontkivska, Alejandro P. Rooney and Masatoshi Nei

Institute of Molecular Evolutionary Genetics and Department of Biology, Pennsylvania State University

Histones are small basic proteins encoded by a multigene family and are responsible for the nucleosomal organization of chromatin in eukaryotes. Because of the high degree of protein sequence conservation, it is generally believed that histone genes are subject to concerted evolution. However, purifying selection can also generate a high degree of sequence homogeneity. In this study, we examined the long-term evolution of histone H4 genes to determine whether concerted evolution or purifying selection was the major factor for maintaining sequence homogeneity. We analyzed the proportion (pS) of synonymous nucleotide differences between the H4 genes from 59 species of fungi, plants, animals, and protists and found that pS is generally very high and often close to the saturation level (pS ranging from 0.3 to 0.6) even though protein sequences are virtually identical for all H4 genes. A small proportion of genes showed a low level of pS values, but this appeared to be caused by recent gene duplication. Our findings suggest that the members of this gene family evolve according to the birth-and-death model of evolution under strong purifying selection. Using histone-like genes in archaebacteria as outgroups, we also showed that H1, H2A, H2B, H3, and H4 histone genes in eukaryotes form separate clusters and that these classes of genes diverged nearly at the same time, before the eukaryotic kingdoms diverged.


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