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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.
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
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The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
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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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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Pleiotropy is the phenomenon in which a single gene impacts multiple, seemingly unrelated phenotypic traits. For example, defects in the SOX10 gene cause Waardenburg Syndrome Type 4, or WS4, which can cause defects in pigmentation, hearing impairments, and an absence of intestinal contractions necessary for elimination. This diversity of phenotypes results from the expression pattern of SOX10 in early embryonic and fetal development. SOX10 is found in neural crest cells that form melanocytes,...
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Video Experimental Relacionado

Updated: Jul 30, 2025

Detection of Retrotransposition Activity of Hot LINE-1s by Long-Distance Inverse PCR
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Retrotransposición somática generalizada en el epitelio colorrectal normal

Chang Hyun Nam1, Jeonghwan Youk1,2,3, Jeong Yeon Kim2

  • 1Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.

Nature
|May 10, 2023
PubMed
Resumen

Las células somáticas acumulan alteraciones genómicas a través de la retrotransposición del elemento nuclear intercalado largo-1 (L1), un elemento móvil. Este estudio revela que la actividad de L1 en las células normales aumenta con la edad y en el cáncer colorrectal.

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Área de la Ciencia:

  • La genómica
  • Biología molecular
  • La epigenética

Sus antecedentes:

  • Las alteraciones genómicas se acumulan en las células somáticas durante toda la vida.
  • El papel de la retrotransposición del elemento nuclear-1 (L1) intercalado largo en los paisajes de mutación celular normales se entiende mal.

Objetivo del estudio:

  • Investigar las secuencias de todo el genoma de clones unicelulares para comprender la retrotransposición somática L1 en células normales.
  • Identificar la velocidad, las características y la regulación de los eventos de retrotransposición L1 en diferentes tipos de células y edades.

Principales métodos:

  • Secuenciación de todo el genoma de 899 clones de una sola célula de 28 individuos.
  • Identificación y análisis de los eventos de retrotransposición somática L1.
  • Impresión digital de los elementos de origen L1 y análisis multidimensional de la actividad de retrotransposición.

Principales resultados:

  • Se identificaron 1.708 eventos somáticos de retrotransposición L1, enriquecidos en el epitelio colorrectal y correlacionados con la edad.
  • Las retrotransposiciones somáticas L1 ocurren desde la embriogénesis temprana, con regulación epigenética establecida durante la organogénesis.
  • Las L1 competentes para la retrotransposición con frecuencias aleloides más bajas mostraron una mayor actividad, y solo una fracción de las transcripciones de L1 fueron retrotranspuestas.

Conclusiones:

  • La retrotransposición somática L1 contribuye al mosaicismo en las células normales a lo largo de la vida humana.
  • Las tasas de retrotransposición L1 aumentan significativamente durante la tumorigénesis colorrectal.
  • Este estudio proporciona información sobre la regulación genómica y epigenómica de los elementos transponibles.