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How did a duplicated gene copy evolve into a restorer-of-fertility gene in a plant? The case of Oma1

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Title: How did a duplicated gene copy evolve into a restorer-of-fertility gene in a plant? The case of Oma1
Authors: Arakawa, Takumi Browse this author
Sugaya, Hajime Browse this author
Katsuyama, Takaya Browse this author
Honma, Yujiro Browse this author →KAKEN DB
Matsui, Katsunori Browse this author
Matsuhira, Hiroaki Browse this author →KAKEN DB
Kuroda, Yosuke Browse this author →KAKEN DB
Kitazaki, Kazuyoshi Browse this author →KAKEN DB
Kubo, Tomohiko Browse this author →KAKEN DB
Keywords: nuclear–mitochondrial interaction
gene duplication
cytoplasmic male sterility
plant reproduction
Issue Date: 6-Nov-2019
Publisher: The Royal Society
Journal Title: Royal Society Open Science
Volume: 6
Issue: 11
Start Page: 190853
Publisher DOI: 10.1098/rsos.190853
Abstract: Restorer-of-fertility (Rf) is a suppressor of cytoplasmic male sterility (CMS), a mitochondrion-encoded trait that has been reported in many plant species. The occurrence of CMS is considered to be independent in each lineage; hence, the question of how Rf evolved was raised. Sugar beet Rf resembles Oma1, a gene for quality control of the mitochondrial inner membrane. Oma1 homologues comprise a small gene family in the sugar beet genome, unlike Arabidopsis and other eukaryotes. The sugar beet sequence that best matched Arabidopsis atOma1 was named bvOma1; sugar beet Rf (RF1-Oma1) was another member. During anther development, atOma1 mRNA was detected from the tetrad to the microspore stages, whereas bvOma1 mRNA was detected at the microspore stage and RF1-Oma1 mRNA was detected during the meiosis and tetrad stages. A transgenic study revealed that, whereas RF1-Oma1 can bind to a CMS-specific protein and alter the higher-order structure of the CMS-specific protein complex, neither bvOma1 nor atOma1 show such activity. We favour the hypothesis that an ancestral Oma1 gene duplicated to form a small gene family, and that one of the copies evolved and acquired a novel expression pattern and protein function as an Rf, i.e. RF1-Oma1 evolved via neofunctionalization.
Rights: © 2019 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License, which permits unrestricted use, provided the original author and source are credited.
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 久保 友彦

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