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CpG Methylation of the Proximal Promoter Region Regulates the Expression of NAC6D Gene in Response to High Temperature in Wheat (Triticum aestivum)

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Abstract

Methylation of DNA promoter sequences at the CpG islands has become a molecular tool for gene regulation. NAC6D gene is induced by different biotic and abiotic stimuli. The proximal promoter sequence of NAC6D was investigated for the impact of CpG methylation on its expression in response to high temperature in wheat. Gene expression was estimated by real time PCR and methylation of NAC6D promoter sequence was investigated by bisulfite sequencing. Results showed that NAC6D was highly induced by high temperature, whereas DNA methylatransferase 3 (Met3) was highly reduced by high temperature. Close investigation of NAC6D promoter methylation revealed that high temperature caused hypomehtylation of the proximal promoter sequence. Twelve CpGsites showed low difference in methylation compared to the control (normal temperature, 25°C), while 3 CpGs (–59, –169, –204) were extremely hypomethylated in response to high temperature compared to their methylation status under the normal condition. The induction of NAC6D was negatively correlated with Met3 suppression and methylation level at the CpG sites in the promoter region. Results prove that methylation greatly contribute to the regulation of NAC6D in response to high temperature. This will improve our current understanding of how plants respond to abiotic stresses at the molecular level and the integration of DNA methylation and epigenetics in the next generation plant breeding.

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The current work was funded by Taif University Researcher Supporting Project number (TURSP–2020/75), Taif University, Taif, Saudi Arabia.

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  1. Department of Biotechnology, College of Science, Taif University, 21944, Taif, P.O. Box 11099, Saudi Arabia

    A. M. El-Shehawi

  2. Department of Genetics, Faculty of Agriculture, University of Alexandria, 21545, Elshatby, Alexandria, Egypt

    M. A. Elseehy & M. M. Elseehy

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El-Shehawi, A.M., Elseehy, M.A. & Elseehy, M.M. CpG Methylation of the Proximal Promoter Region Regulates the Expression of NAC6D Gene in Response to High Temperature in Wheat (Triticum aestivum). Cytol. Genet. 56, 449–457 (2022). https://doi.org/10.3103/S009545272205005X

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