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Videos de Conceptos Relacionados

Crossing Over01:34

Crossing Over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
Crossing Over01:30

Crossing Over

Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...
Meiosis I01:49

Meiosis I

Meiosis is a carefully orchestrated set of cell divisions, the goal of which—in humans—is to produce haploid sperm or eggs, each containing half the number of chromosomes present in somatic cells elsewhere in the body. Meiosis I is the first such division, and involves several key steps, among them: condensation of replicated chromosomes in diploid cells; the pairing of homologous chromosomes and their exchange of information; and finally, the separation of homologous chromosomes by a...
Meiosis I03:09

Meiosis I

Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Meiosis I03:09

Meiosis I

Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...

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Video Experimental Relacionado

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Frequency and Distribution of Crossovers in Caenorhabditis elegans Meiosis by SNP Genotyping using Real-time PCR
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Published on: July 11, 2025

La FANCM limita los cruces entre medio y medio.

Wayne Crismani1, Chloé Girard, Nicole Froger

  • 1Institut National de la Recherche Agronomique (INRA), UMR1318, Institut Jean-Pierre Bourgin, Versailles, France.

Science (New York, N.Y.)
|June 23, 2012
PubMed
Resumen

Los científicos identificaron la helicasa FANCM como un factor clave que limita los cruces meióticos (COs) en Arabidopsis. El mutante fancm mostró un aumento de tres veces en COs, revelando una nueva vía para la regulación de CO con potencial en el mejoramiento de plantas.

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Frequency and Distribution of Crossovers in Caenorhabditis elegans Meiosis by SNP Genotyping using Real-time PCR
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Área de la Ciencia:

  • Genética vegetal y biología molecular.
  • Meiosis y estabilidad del genoma.

Sus antecedentes:

  • La frecuencia de cruce meiótico (CO) está estrictamente regulada, a pesar de los abundantes precursores moleculares.
  • Los factores específicos que limitan los números de CO siguen siendo en gran medida no identificados.

Objetivo del estudio:

  • Para identificar los factores genéticos clave que limitan la formación de cruce meiotic en Arabidopsis thaliana.
  • Comprender el papel de la helicasa FANCM en la regulación de la frecuencia mediotica de CO.

Principales métodos:

  • Se llevó a cabo una prueba genética en Arabidopsis thaliana para identificar mutantes con tasas de CO meiotic alteradas.
  • Se analizaron las frecuencias de CO en plantas de tipo silvestre y fancm mutantes.

Principales resultados:

  • Identificó la helicasa FANCM conservada como un factor importante que limita el CO meiotico.
  • El mutante fancm exhibió un aumento de tres veces en la frecuencia de CO en comparación con el tipo silvestre.
  • El aumento de COs en el mutante surgió de una vía alternativa, típicamente menor.

Conclusiones:

  • FANCM es un regulador crucial que impone un límite superior a las COs meioticas.
  • La función de FANCM en la limitación de CO ofrece potencial para la manipulación en las estrategias de mejoramiento de plantas.