Nonconcerted evolution of histone 3 genes in a liverwort, Conocephalum conicum. Kim, H., N. & Yamazaki, T. Genes genetic systems, 79(6):331-344, 2004. abstract bibtex To estimate the extent of genetic variation at the DNA level, the histone 3 (H3) genes were sequenced from single individual each from the three cryptic species recognized based on allozyme analyses, YFS, J and T types of Conocephalum conicum and two closely related species, C. japonicum and Marchantia polymorpha. Although the H3 genes are known to be highly conserved, the nucleotide diversities were 0.128, 0.109, 0.108, 0.049 and 0.034. These values are 30 to 100 times higher than that in Drosophila melanogaster (0.001). Besides, there were considerable differences in the position, length and number of introns among the loci of H3 genes. The observed high level of nucleotide diversities was explained by the fixation of many random mutations, and non-concerted evolution that resulted from low rates of unequal crossing-over and gene conversion probably due to the dispersed structure of H3 genes on genome in this species. The non-concerted evolutionary pattern was established by the analysis of phylogenetic tree and divergence rates. This study confirmed previous results suggesting that natural populations of liverwort maintains high extent of variation at DNA level.
@article{
title = {Nonconcerted evolution of histone 3 genes in a liverwort, Conocephalum conicum.},
type = {article},
year = {2004},
pages = {331-344},
volume = {79},
institution = {Laboratory of Molecular Population Genetics, Department of Molecular Biology, Faculty of Medicine, Kyushu University, Fukuoka 812-8581, Japan. hnkim@jj.ac.kr},
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last_modified = {2011-05-20T17:26:16.000Z},
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abstract = {To estimate the extent of genetic variation at the DNA level, the histone 3 (H3) genes were sequenced from single individual each from the three cryptic species recognized based on allozyme analyses, YFS, J and T types of Conocephalum conicum and two closely related species, C. japonicum and Marchantia polymorpha. Although the H3 genes are known to be highly conserved, the nucleotide diversities were 0.128, 0.109, 0.108, 0.049 and 0.034. These values are 30 to 100 times higher than that in Drosophila melanogaster (0.001). Besides, there were considerable differences in the position, length and number of introns among the loci of H3 genes. The observed high level of nucleotide diversities was explained by the fixation of many random mutations, and non-concerted evolution that resulted from low rates of unequal crossing-over and gene conversion probably due to the dispersed structure of H3 genes on genome in this species. The non-concerted evolutionary pattern was established by the analysis of phylogenetic tree and divergence rates. This study confirmed previous results suggesting that natural populations of liverwort maintains high extent of variation at DNA level.},
bibtype = {article},
author = {Kim, Hong Nam and Yamazaki, Tsuneyuki},
journal = {Genes genetic systems},
number = {6}
}
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