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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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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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Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata...
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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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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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Transposable elements in early human embryo development and embryo models.

Jonathan A DiRusso1, Amander T Clark1

  • 1Department of Molecular, Cell and Developmental Biology, University of California, 90095 Los Angeles, CA, USA; Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California, 90095 Los Angeles, CA, USA.; Molecular Biology Institute, University of California, 90095 Los Angeles, CA, USA; Center for Reproductive Science, Health and Education, University of California, 90095 Los Angeles, CA, USA.

Current Opinion in Genetics & Development
|July 13, 2023
PubMed
Summary
This summary is machine-generated.

Transposable elements (TEs) are key drivers of genomic evolution and gene regulation, especially in early development. New stem cell models offer insights into their role in human embryonic development.

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Area of Science:

  • Genomics
  • Developmental Biology
  • Molecular Evolution

Background:

  • Transposable elements (TEs), once dismissed as 'junk DNA,' are now recognized for their significant roles in shaping genomes.
  • TEs are crucial for genomic evolution, genome organization, and gene regulation.
  • Their impact is particularly pronounced during early embryonic development.

Purpose of the Study:

  • To summarize current understanding of transposable elements in early human development.
  • To explore the utility of novel stem cell-based embryo models for studying TEs.
  • To highlight advances in computational and sequencing approaches for TE research.

Main Methods:

  • Review of recent scientific literature on TEs and early development.
  • Analysis of advances in stem cell technologies.
  • Integration of next-generation sequencing and computational methods.

Main Results:

  • TEs are increasingly understood as active contributors to genomic innovation and regulation.
  • Stem cell technologies provide powerful tools to model early development and TE activity.
  • Computational and sequencing advances enable detailed analysis of TE dynamics.

Conclusions:

  • Transposable elements play a fundamental role in early mammalian and human development.
  • Stem cell-based embryo models are essential for future research on TEs.
  • Further investigation using these models will deepen our understanding of TE contributions to development and evolution.