Characteristics of N 6-Methyladenosine Modification During Sexual Reproduction of Chlamydomonas Reinhardtii

Genomics, Proteomics & Bioinformatics - Tập 21 - Trang 756-768 - 2023
Ying Lv1,2,3, Fei Han1,2,3, Mengxia Liu4,5, Ting Zhang4, Guanshen Cui4, Jiaojiao Wang1,2,3,5, Ying Yang4,5,6, Yun-Gui Yang4,5,6, Wenqiang Yang1,2,3,5,7
1Photosynthesis Research Center, Key Laboratory of Photobiology, Institute of Botany, Chinese Academy of Sciences, Beijing, 100093, China,
2China National Botanical Garden, Beijing 100093, China
3College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China
4CAS Key Laboratory of Genomic and Precision Medicine, Beijing Institute of Genomics, Chinese Academy of Sciences and China National Center for Bioinformation, Beijing 100101, China
5Sino-Danish College, University of Chinese Academy of Sciences, Beijing 100049, China
6Institute of Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing 100101, China
7Innovative Academy of Seed Design, Chinese Academy of Sciences, Beijing, 100093, China

Tóm tắt

Abstract The unicellular green alga Chlamydomonas reinhardtii (hereafter Chlamydomonas) possesses both plant and animal attributes, and it is an ideal model organism for studying fundamental processes such as photosynthesis, sexual reproduction, and life cycle. N6-methyladenosine (m6A) is the most prevalent mRNA modification, and it plays important roles during sexual reproduction in animals and plants. However, the pattern and function of m6A modification during the sexual reproduction of Chlamydomonas remain unknown. Here, we performed transcriptome and methylated RNA immunoprecipitation sequencing (MeRIP-seq) analyses on six samples from different stages during sexual reproduction of the Chlamydomonas life cycle. The results show that m6A modification frequently occurs at the main motif of DRAC (D = G/A/U, R = A/G) in Chlamydomonas mRNAs. Moreover, m6A peaks in Chlamydomonas mRNAs are mainly enriched in the 3′ untranslated regions (3′UTRs) and negatively correlated with the abundance of transcripts at each stage. In particular, there is a significant negative correlation between the expression levels and the m6A levels of genes involved in the microtubule-associated pathway, indicating that m6A modification influences the sexual reproduction and the life cycle of Chlamydomonas by regulating microtubule-based movement. In summary, our findings are the first to demonstrate the distribution and the functions of m6A modification in Chlamydomonas mRNAs and provide new evolutionary insights into m6A modification in the process of sexual reproduction in other plant organisms.

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