期刊
MOLECULAR BIOLOGY AND EVOLUTION
卷 30, 期 10, 页码 2347-2365出版社
OXFORD UNIV PRESS
DOI: 10.1093/molbev/mst132
关键词
gene family evolution; gene duplication; transcription factor; homeodomain leucine zipper
资金
- U.S. National Science Foundation [IOS0515435]
- Australian Research Council [FF0561326]
- Grants-in-Aid for Scientific Research [24770077, 24113521] Funding Source: KAKEN
- Australian Research Council [FF0561326] Funding Source: Australian Research Council
Class IV homeodomain leucine zipper (C4HDZ) genes are plant-specific transcription factors that, based on phenotypes in Arabidopsis thaliana, play an important role in epidermal development. In this study, we sampled all major extant lineages and their closest algal relatives for C4HDZ homologs and phylogenetic analyses result in a gene tree that mirrors land plant evolution with evidence for gene duplications in many lineages, but minimal evidence for gene losses. Our analysis suggests an ancestral C4HDZ gene originated in an algal ancestor of land plants and a single ancestral gene was present in the last common ancestor of land plants. Independent gene duplications are evident within several lineages including mosses, lycophytes, euphyllophytes, seed plants, and, most notably, angiosperms. In recently evolved angiosperm paralogs, we find evidence of pseudogenization via mutations in both coding and regulatory sequences. The increasing complexity of the C4HDZ gene family through the diversification of land plants correlates to increasing complexity in epidermal characters.
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