title: Evolution of the class IV HD-zip gene family in streptophytes.
abstract: 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.
authors.affiliation: Section of Plant Biology, University of California, Davis.
authors.forename: Christopher S
authors.initials: CS
authors.lastname: Zalewski
authors.forename: Sandra K
authors.initials: SK
authors.lastname: Floyd
authors.forename: Chihiro
authors.initials: C
authors.lastname: Furumizu
authors.forename: Keiko
authors.initials: K
authors.lastname: Sakakibara
authors.forename: Dennis W
authors.initials: DW
authors.lastname: Stevenson
authors.forename: John L
authors.initials: JL
authors.lastname: Bowman
mesh_terms: D017360:Arabidopsis / Q000235:genetics*; D029681:Arabidopsis Proteins / Q000235:genetics* / Q000378:metabolism*; D001483:Base Sequence; D003062:Codon; D019669:Embryophyta / Q000145:classification / Q000235:genetics*; D019143:Evolution, Molecular; D020440:Gene Duplication; D018506:Gene Expression Regulation, Plant; D018398:Homeodomain Proteins / Q000145:classification / Q000235:genetics* / Q000378:metabolism*; D016350:Leucine Zippers / Q000235:genetics*; D005810:Multigene Family; D009154:Mutation; D010802:Phylogeny; D010940:Plant Proteins / Q000145:classification / Q000235:genetics / Q000378:metabolism; D012045:Regulatory Sequences, Nucleic Acid; D057949:Streptophyta / Q000145:classification / Q000235:genetics*; D014157:Transcription Factors / Q000145:classification / Q000235:genetics / Q000378:metabolism
chemical_list: D029681:Arabidopsis Proteins; D003062:Codon; C493946:HD-Zip protein, Arabidopsis; D018398:Homeodomain Proteins; D010940:Plant Proteins; D014157:Transcription Factors
keywords: gene duplication; gene family evolution; homeodomain leucine zipper; transcription factor
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