Related Experiment Video
Updated: Jun 19, 2026
10:08
Experimental Design for Laser Microdissection RNA-Seq: Lessons from an Analysis of Maize Leaf Development
Published on: March 5, 2017
Next-generation sequencing reveals complex relationships between the epigenome and transcriptome in maize
Axel A Elling1, Xing Wang Deng
1Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT 06520, USA.
Plant Signaling & Behavior
|October 13, 2009
Summary
Maize gene regulation involves epigenetic marks and small RNAs. Researchers discovered distinct small RNA patterns in roots and shoots, suggesting multiple pathways for small interfering RNA (siRNA) generation.
Area of Science:
- Genomics and Epigenetics
- Plant Molecular Biology
Background:
- Epigenetic modifications, including DNA methylation and histone modifications, are crucial for gene regulation.
- Small RNAs, such as microRNAs (miRNAs) and small interfering RNAs (siRNAs), are key regulators of gene expression.
- Understanding these mechanisms in maize is vital for crop improvement.
Discussion:
- This study presents a comprehensive survey of epigenetic marks and small RNAs in the maize genome using Solexa/Illumina sequencing.
- Analysis revealed tissue-specific epigenetic patterns, highlighting antagonistic and synergistic relationships between different histone modifications.
- Small RNA distribution was found to be tissue-specific, with 24-nt siRNAs abundant in shoots and 21-nt miRNAs in roots.
Key Insights:
- A novel class of 22-nt siRNAs may be generated independently of RNA-dependent RNA polymerase (RdRP).
- This suggests maize has at least two distinct siRNA biogenesis pathways: one RdRP-dependent and another potentially RdRP-independent.
- Tissue-specific accumulation of small RNAs, like miRNAs and siRNAs, correlates with specific gene expression patterns.
Outlook:
- Further investigation into the RdRP-independent siRNA pathway could uncover novel regulatory mechanisms in maize.
- Characterizing these epigenetic and small RNA pathways can inform strategies for enhancing maize traits.
- This research provides a foundation for exploring epigenetic regulation in other complex plant genomes.
Related Concept Videos
03:21RNA-seq
RNA sequencing, or RNA-Seq, is a high-throughput sequencing technology used to study the transcriptome of a cell. Transcriptomics helps to interpret the functional elements of a genome and identify the molecular constituents of an organism. Additionally, it also helps in understanding the development of an organism and the occurrence of diseases.
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...
Before the discovery of RNA-seq, microarray-based methods and Sanger sequencing were used for transcriptome analysis. However, while microarray-based...
01:46Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
01:37Epigenetic Regulation
Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
X-chromosome...
01:46Epigenetic Regulation
Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
01:09Epistasis Analysis
Although Mendel chose seven unrelated traits in peas to study gene segregation, most traits involve multiple gene interactions that create a spectrum of phenotypes. When the interaction of various genes or alleles at different locations influences a phenotype, this is called epistasis. Epistasis often involves one gene masking or interfering with the expression of another (antagonistic epistasis). Epistasis often occurs when different genes are part of the same biochemical pathway. The...
03:00Next-generation Sequencing
The first human genome sequencing project cost $2.7 billion and was declared complete in 2003, after 15 years of international cooperation and collaboration between several research teams and funding agencies. Today, with the advent of next-generation sequencing technologies, the cost and time of sequencing a human genome have dropped over 100 fold.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.
Next-Generation Sequencing Methods
Although all next-generation methods use different technologies, they all share a set of standard features.