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Related Concept Videos

Overview of Transposition and Recombination02:13

Overview of Transposition and Recombination

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Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...
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Epigenetic Regulation01:37

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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...
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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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DNA-only Transposons02:57

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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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As the name suggests, non-LTR retrotransposons lack the long terminal repeats characteristic of the LTR retrotransposons. Additionally, both LTR and non-LTR retrotransposons use distinct mechanisms of mobilization. Non-LTR retrotransposons are further divided into two classes - Long interspersed nuclear elements (LINEs) and short interspersed nuclear elements (SINEs), both of which occur abundantly in most mammals, including humans. Some of the active non-LTR retrotransposons in humans are L1...
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Related Experiment Video

Updated: Mar 13, 2026

Profiling of H3K4me3 Modification in Plants using Cleavage under Targets and Tagmentation
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Profiling Transposable Elements and Their Epigenetic Effects in Non-model Species.

Christian Parisod1

  • 1Laboratory of Evolutionary Botany, Biology Institute, University of Neuchâtel, Rue Emile-Argand 11, 2009, Neuchâtel, Switzerland. christian.parisod@unine.ch.

Methods in Molecular Biology (Clifton, N.J.)
|October 23, 2016
PubMed
Summary
This summary is machine-generated.

Studying transposable elements (TEs) and their epigenetic changes is difficult without a reference genome. New molecular methods, like methyl-sensitive transposon display (MSTD), help analyze TE methylation and genome variation in such species.

Keywords:
Epigenetic effectsMethyl-sensitive transposon displayPlantsTransposable elementsTransposons

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Area of Science:

  • Genomics
  • Epigenetics
  • Molecular Biology

Background:

  • Assessing genetic and epigenetic variation is challenging in species lacking high-quality reference genomes, particularly concerning transposable elements (TEs).
  • Transposable elements play significant roles in genome evolution and function, but their study is hampered by their repetitive nature and the absence of comprehensive genomic resources in many organisms.

Purpose of the Study:

  • To describe molecular techniques for analyzing genetic and epigenetic variation related to transposable elements in species without a reference genome.
  • To introduce methyl-sensitive transposon display (MSTD) as a method to investigate the methylation status of TE insertions.

Main Methods:

  • Development and application of molecular techniques to reduce genome complexity and target TE-specific alterations.
  • Utilizing methyl-sensitive transposon display (MSTD), which employs isoschizomers and PCR amplification.
  • Assessing the methylation environment of TE insertions by analyzing differential DNA cutting or protection patterns.

Main Results:

  • Methyl-sensitive transposon display (MSTD) provides reliable insights into the methylation status of transposable element insertions.
  • The described methods enable the study of genome-wide epigenetic changes associated with TEs, even without a reference genome.
  • Combining MSTD with other techniques that track random sequences can offer a more comprehensive view of genomic and epigenomic variation.

Conclusions:

  • The presented molecular techniques, including MSTD, offer valuable tools for studying transposable elements and epigenetic variation in non-model organisms.
  • These methods facilitate a deeper understanding of the role of TEs in genome dynamics and evolution across diverse species.
  • The ability to analyze TE methylation and restructuring without a reference genome opens new avenues for comparative epigenomics.