Video Experimental Relacionado
Updated: May 7, 2026

09:16
A Simple and Efficient Approach to Construct Mutant Vaccinia Virus Vectors
Published on: October 30, 2016
La viruela blanca (mu) mutantes del virus de la viruela del conejo. III. en el sentido de que se trata de un La
Cell
|November 1, 1980
Resumen
Los mutantes del virus de la viruela del conejo (RPV) revelan inserciones y deleciones de ADN en los extremos del genoma. Las secuencias de ADN terminal no son esenciales para la infección, lo que sugiere que su variabilidad influye en la patogenicidad del ortopoxvirus.
Área de la Ciencia:
- Virología Virología.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- El virus de la viruela del conejo (RPV, por sus siglas en inglés) exhibe mutantes de rango no anfitrión.
- Comprender la estructura del genoma viral es clave para la patogenicidad.
Objetivo del estudio:
- Para analizar las alteraciones del ADN en mutantes de la gama de no huéspedes del RPV.
- Para investigar el papel de las secuencias terminales de ADN en la infección por RPV y la patogenicidad.
Principales métodos:
- Análisis de fragmentos de restricción del ADN viral.
- Comparación de los patrones de ADN entre el RPV de tipo salvaje y los mutantes (RPmu21, RPmu7, RPmu81g).
Principales resultados:
- Los mutantes RPmu21 y RPmu7 muestran inserciones del ADN viral más a la izquierda en la región derecha del genoma, con deleciones en el extremo derecho.
- El mutante RPmu81g muestra inserción de secuencias de ADN más a la derecha en el extremo izquierdo del genoma, con deleciones en el extremo izquierdo.
- Todos los mutantes conservan secuencias transpuestas entrelazadas, lo que indica mecanismos específicos de reordenamiento del ADN.
Conclusiones:
- Las secuencias de ADN terminal de RPV no son esenciales para la infección productiva en algunas células huésped.
- La variabilidad e intercambiabilidad de las secuencias terminales de ADN pueden contribuir a la patogenicidad del ortopoxvirus.
- El núcleo del genoma de RPV está altamente conservado, y las regiones terminales son más dinámicas.
Videos de Conceptos Relacionados
Epistasis
In addition to multiple alleles at the same locus influencing traits, numerous genes or alleles at different locations may interact and influence phenotypes in a phenomenon called epistasis. For example, rabbit fur can be black or brown depending on whether the animal is homozygous dominant or heterozygous at a TYRP1 locus. However, if the rabbit is also homozygous recessive at a locus on the tyrosinase gene (TYR), it will have an unshaded coat that appears white, regardless of its TYRP1...
In-vitro Mutagenesis
To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
Viral Mutations
A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material for adaptive...
LTR Retrotransposons
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...
The internal coding region of LTR retrotransposons and their mechanism of transposition closely resembles a...
piRNA - Piwi-interacting RNAs
PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
Exon Recombination
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...

