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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 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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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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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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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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Horizontal Gene Transfer

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Horizontal gene transfer (HGT) is a process where genetic material moves between organisms within the same generation, unlike vertical gene transfer, which occurs from parent to offspring. HGT plays a crucial role in microbial evolution, adaptation, and survival, particularly in shared environments like the human gut.Mobile genetic elements such as plasmids, prophages, integrons, insertion sequences, and transposons facilitate this process. HGT occurs through three primary mechanisms:...
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HOX Loci Focused CRISPR/sgRNA Library Screening Identifying Critical CTCF Boundaries
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La tectónica del transposón humano en la tectónica del transposón humano.

Kathleen H Burns1, Jef D Boeke

  • 1Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. kburns@jhmi.edu

Cell
|May 15, 2012
PubMed
Resumen
Este resumen es generado por máquina.

Los elementos móviles del ADN llamados retrotransposones pueden moverse y crear nuevas inserciones, causando potencialmente enfermedades. Las nuevas tecnologías ayudan a detectar estos cambios dinámicos, revelando su impacto en la variación del genoma humano y la salud.

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Área de la Ciencia:

  • La genómica es la genómica.
  • Biología Molecular Biología Molecular
  • Genética Humana Genética Humana.

Sus antecedentes:

  • El ADN móvil, particularmente los retrotransposones, constituye más de la mitad del genoma humano.
  • La mayoría de las retrotransposones están inactivas, pero algunas conservan la capacidad de transposición.
  • La actividad del retrotransposón puede conducir a enfermedades genéticas y cáncer a través de inserciones de novo.

Objetivo del estudio:

  • Para investigar el papel del ADN móvil en la conformación del genoma humano.
  • Explorar la naturaleza dinámica de las inserciones de retrotransposones y su contribución a la variación estructural.
  • Para resaltar los desafíos y avances en la detección de inserciones de retrotransposición de novo.

Principales métodos:

  • Utilizó nuevas tecnologías para detectar inserciones polimórficas.
  • Se analizaron las repeticiones intercaladas resultantes de la actividad del retrotransposón.
  • Los eventos de inserción de novo investigados.

Principales resultados:

  • Los ADN móviles son una fuente sustancial de variación estructural dinámica.
  • Pueden ocurrir nuevos eventos de transposición, desafiando las nociones anteriores de quiescencia de retrotransposición.
  • Los avances en las tecnologías de detección están mejorando nuestra capacidad para identificar estos elementos móviles.

Conclusiones:

  • Las retrotransposones siguen siendo una fuerza activa en la evolución y variación del genoma.
  • Comprender las inserciones de novo es crucial para el diagnóstico de enfermedades genéticas y cáncer.
  • Se necesita más investigación para cuantificar el impacto de la transposición en la salud humana.