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Role of methyltransferase 1-dependent DNA methylation in affecting maize kernel development
Xiaosong Li1, Xuqing Tong1, Bin Wang2
1State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Taian, Shandong, 271018, China.
The Plant Journal : for Cell and Molecular Biology
|February 26, 2025
Summary
The DNA methyltransferase ZmMET1 is crucial for maize kernel development. Loss of ZmMET1 function in smk313 mutants causes small kernels and developmental defects by altering DNA methylation and chromatin accessibility.
Area of Science:
- Plant biology
- Epigenetics
- Maize genetics
Background:
- DNA methylation is vital for plant development.
- The specific role of DNA methylation in maize kernel development is not fully understood.
- Maize kernel mutants can reveal essential developmental genes.
Purpose of the Study:
- To identify the gene responsible for the maize kernel mutant smk313.
- To investigate the function of ZmMET1 in maize kernel development.
- To elucidate the molecular mechanisms underlying ZmMET1's role.
Main Methods:
- Genetic analysis of the smk313 mutant.
- Whole Genome Bisulfite Sequencing (WGBS) to analyze DNA methylation.
- Assay for Transposon Accessibility via Sequencing (ATAC-seq) to assess chromatin accessibility.
- Transcriptome analysis to study gene expression.
Main Results:
- The gene responsible for smk313 was identified as ZmMET1, a DNA methyltransferase.
- smk313 mutants exhibit small kernels with developmental abnormalities in BETL, EAS, and SEs.
- Mutants show reduced CG methylation density and increased accessible chromatin regions genome-wide.
- ZmMET1 deficiency alters expression of genes involved in starch/protein synthesis and material transport.
Conclusions:
- ZmMET1 plays a vital role in maize seed development.
- Loss of ZmMET1 function impacts kernel development through epigenetic modifications.
- Epigenetic regulation by ZmMET1 is essential for normal maize kernel formation and function.
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