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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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Transposons, or "jumping genes," are small mobile genetic elements (MGEs) that range from 700 to 40,000 base pairs in length. They are found in all organisms and can move within the same chromosome or transfer to different chromosomes. In some cases, transposons can also jump between different host DNA molecules, such as plasmids or viruses, contributing to genetic variability.Barbara McClintock first discovered these mobile genetic elements in the 1940s while studying maize genetics, and she...
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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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LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
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Non-LTR Retrotransposons03:18

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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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Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
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Updated: May 1, 2026

Genetic Mapping of Thermotolerance Differences Between Species of Saccharomyces Yeast via Genome-Wide Reciprocal Hemizygosity Analysis
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TEMP: a computational method for analyzing transposable element polymorphism in populations.

Jiali Zhuang1, Jie Wang1, William Theurkauf2

  • 1Program in Bioinformatics and Integrative Biology, Department of Biochemistry and Molecular Pharmacology.

Nucleic Acids Research
|April 23, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces TEMP, a new method to track transposable element (TE) movements in populations. TEMP accurately detects TE insertions and estimates their frequencies, advancing genome evolution research.

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Following the Dynamics of Structural Variants in Experimentally Evolved Populations
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Area of Science:

  • Genomics
  • Population Genetics
  • Molecular Evolution

Background:

  • Transposable elements (TEs) significantly influence genome stability and variability.
  • Understanding TE dynamics at the population level is key to deciphering genome evolution.
  • High-throughput sequencing of pooled DNA is effective for population polymorphism studies.

Purpose of the Study:

  • To develop a novel method, TEMP, for detecting transposable element (TE) movements across a range of population frequencies.
  • To accurately estimate transposition event frequencies and pinpoint high-frequency junctions at nucleotide resolution.
  • To provide a freely available tool for population-level TE analysis.

Main Methods:

  • TEMP utilizes pair-end and split reads to identify TE insertions and deletions in pooled genomic DNA.
  • The method is validated using simulation data and whole-genome human data from the 1000 Genomes Project.
  • Application to Drosophila melanogaster populations to study TE inheritance and effects.

Main Results:

  • TEMP demonstrates superior performance compared to existing algorithms like PoPoolationTE, RetroSeq, VariationHunter, and GASVPro.
  • The method successfully characterized TE frequencies and inheritance patterns in a wild Drosophila population.
  • Identified sequence signatures of TE insertion and their potential molecular impacts, including altered gene expression and piRNA production.

Conclusions:

  • TEMP is a powerful and accurate tool for analyzing transposable element dynamics in populations.
  • The method provides crucial insights into genome evolution mechanisms driven by TE activity.
  • TEMP facilitates the study of TE insertion effects on host genomes and gene regulation.