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Xiang Y, Zhang M, Hu Y, Wang L, Xiao X, Yin F, Cao X, Sui M, Yao Y. Epigenetic modifications of 45S rDNA associates with the disruption of nucleolar organisation during Cd stress response in Pakchoi. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 270:115859. [PMID: 38157795 DOI: 10.1016/j.ecoenv.2023.115859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Revised: 12/06/2023] [Accepted: 12/17/2023] [Indexed: 01/03/2024]
Abstract
The role of the nucleolus in Pakchoi response to Cd stress remains largely unknown. In this work, we focus on exploring the underling mechanism between nucleolus disruption and epigenetic modification in Cd stressed-Pakchoi. Our results indicated that the proportion of nucleolus disruption, decondensation of 45 S rDNA chromatin, and a simultaneous increase in 5' external transcribed spacer region (ETS) transcription were observed with increasing Cd concentration, accompanied by genome-wide alterations in the levels of histone acetylation and methylation. Further results showed that Cd treatment exhibited a significant increase in H3K9ac, H4K5ac, and H3K9me2 levels occurred in promoter regions of the 45 S rDNA. Additionally, DNA methylation assays in the 45 S rDNA promoter region revealed that individual site-specific hypomethylation may be engaged in the activation of 45 S rDNA transcription. Our study provides some molecular mechanisms for the linkage between Cd stress, rDNA epigenetic modifications, and nucleolus disintegration in plants.
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Affiliation(s)
- Yan Xiang
- College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China
| | - Ming Zhang
- Department of Biotechnology, Jiangxi Biotech Vocational College, Nanchang 330200, China
| | - Yuanfeng Hu
- College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China
| | - Liangdeng Wang
- College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China
| | - Xufeng Xiao
- College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China.
| | - Fengrui Yin
- College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China
| | - Xiaoqun Cao
- College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China
| | - Meilan Sui
- College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China
| | - Yuekeng Yao
- College of Agronomy, Jiangxi Agricultural University, Nanchang 330045, China
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Haga E, Inoue N, Iwatani Y, Arakawa Y, Morita E, Hashimoto H, Noguchi Y, Hidaka Y, Watanabe M. Intraindividual variation in histone acetylation and its impact on autoimmune thyroid diseases. Endocr J 2023; 70:1169-1174. [PMID: 37779085 DOI: 10.1507/endocrj.ej23-0204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/03/2023] Open
Abstract
Autoimmune thyroid diseases (AITDs), such as Graves' disease (GD) and Hashimoto's disease (HD), are organ-specific autoimmune diseases. Histone acetylation, especially that of histone H3, is an epigenetic mechanism that regulates gene expression and is associated with the development of autoimmune diseases. However, physiological variations in histone acetylation are not yet clear, and we believe that physiological variations should be examined prior to analysis of the role of histone H3 in the pathogenesis of AITDs. In this study, we analyzed histone H3 acetylation levels in peripheral blood mononuclear cells (PBMCs) using a histone H3 total acetylation detection fast kit. Blood samples were collected before meals, between 8:30-9:00 am, daily for 10 weeks to evaluate the daily variation. At 4 days, blood was also collected before meals three times a day (at 8:30-9:00, 12:30-13:00, and 16:30-17:00) to evaluate circadian variation. Then, histone H3 acetylation levels were evaluated in AITD patients to clarify the association with the pathogenesis of AITD. Although we could not find a common pattern of circadian variance, we observed daily variation in histone H3 acetylation levels, and their coefficient of variances (CVs) were approximately 48.3%. Then, we found that histone H3 acetylation levels were significantly lower in GD and HD patients than in control subjects and these differences were larger than the daily variation in histone acetylation. In conclusion, histone H3 acetylation levels were associated with the development of AITD, even allowing for daily variation.
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Affiliation(s)
- Emi Haga
- Department of Clinical Laboratory and Biomedical Sciences, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
| | - Naoya Inoue
- Department of Clinical Laboratory and Biomedical Sciences, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
- Laboratory for Clinical Investigation, Osaka University Hospital, Osaka 565-0871, Japan
| | - Yoshinori Iwatani
- Department of Clinical Laboratory and Biomedical Sciences, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
| | - Yuya Arakawa
- Department of Clinical Laboratory and Biomedical Sciences, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
| | - Emi Morita
- Department of Clinical Laboratory and Biomedical Sciences, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
| | - Hidemi Hashimoto
- Department of Clinical Laboratory and Biomedical Sciences, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
| | - Yusuke Noguchi
- Department of Clinical Laboratory and Biomedical Sciences, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
| | - Yoh Hidaka
- Laboratory for Clinical Investigation, Osaka University Hospital, Osaka 565-0871, Japan
| | - Mikio Watanabe
- Department of Clinical Laboratory and Biomedical Sciences, Division of Health Sciences, Osaka University Graduate School of Medicine, Osaka 565-0871, Japan
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