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2023 Fiscal Year Final Research Report

Analysis of epigenome reprogramming controlling the activity of transposable elements

Research Project

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Project/Area Number 21K05519
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 39010:Science in plant genetics and breeding-related
Research InstitutionKindai University

Principal Investigator

Tsukiyama Takuji  近畿大学, 農学部, 准教授 (00423004)

Co-Investigator(Kenkyū-buntansha) 吉川 貴徳  京都大学, 農学研究科, 助教 (00721606)
谷坂 隆俊  吉備国際大学, 農学部, 教授 (80026591)
Project Period (FY) 2021-04-01 – 2024-03-31
Keywords転移因子 / イネ
Outline of Final Research Achievements

In this study, we found that (1) an autonomous element Ping-O present in a tropical japonica cultivar ‘Oiran’ was maintained to be silenced by CG methylation, though the methylation degree of CHG sites in Ping-O was decreased by crossing between tropical and temperate japonica cultivars, and (2) homozygous for the Ping-O allele was necessary for the re-methylation of CHG sites in Ping-O. Furthermore, our results suggest a possibility that ‘Oiran’ might be a valuable cultivar for the study of epigenetics because the epigenome is variable by crossing with temperate japonica cultivars.

Free Research Field

植物育種学

Academic Significance and Societal Importance of the Research Achievements

本研究は、熱帯ジャポニカ品種「おいらん」が有するPing-OのCHGサイトのメチル化は、温帯ジャポニカ品種との交雑によって低下するものの、自殖の過程でPing-Oがホモ接合化することで再度メチル化されることを明らかにした。このことは、ゲノムと転移因子が今なお進化的軍拡競争を繰り広げていることを示すものであり、イネゲノムによるmPing/Pingの転移抑制機構の一端を解明したものである。また、本研究の成果は、エピゲノムの消去と再構築の分子機構を理解するための重要な知見となり得るものである。

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Published: 2025-01-30  

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