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Videos de Conceptos Relacionados

What is Meiosis?01:36

What is Meiosis?

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Meiosis is the process by which diploid cells divide to produce haploid daughter cells. In humans, each diploid cell contains 46 chromosomes, half from the mother and half from the father. Following meiosis, the resulting haploid eggs or sperm only contain 23 chromosomes; however, each of these chromosomes contains a unique combination of parental information that results from the meiotic process of crossing over.
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Meiosis II01:57

Meiosis II

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Meiosis II is the second and final stage of meiosis. It relies on the haploid cells produced during meiosis I, each of which contain only 23 chromosomes—one from each homologous initial pair. Importantly, each chromosome in these cells is composed of two joined copies, and when these cells enter meiosis II, the goal is to separate such sister chromatids using the same microtubule-based network employed in other division processes. The result of meiosis II is two haploid cells, each...
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Meiosis I01:49

Meiosis I

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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...
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Transcription Factors02:16

Transcription Factors

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Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...
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Coordination Number and Geometry02:57

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Switching of BJT01:22

Switching of BJT

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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
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Updated: Feb 14, 2026

Single Molecule Fluorescence In Situ Hybridization smFISH Analysis in Budding Yeast Vegetative Growth and Meiosis
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Cambios generalizados y coordinados en el nivel de proteínas impulsados por la conmutación de isóformos de

Ze Cheng1, George Maxwell Otto1, Emily Nicole Powers1

  • 1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA.

Cell
|February 24, 2018
PubMed
Resumen

La regulación de la expresión génica es más compleja de lo que se pensaba anteriormente. Un estudio en la levadura en ciernes revela un nuevo mecanismo donde el tipo de transcripción, no solo la abundancia, controla los niveles de proteína durante el desarrollo.

Palabras clave:
Los Estados miembrosCoordinaciónDiferenciaciónexpresión génicaTipo de producto:La meiosisPerfilamiento de los ribosomasFactor de transcripciónTraducciónuORF (en inglés)

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Área de la Ciencia:

  • Biología molecular
  • La genética
  • Biología del desarrollo

Sus antecedentes:

  • Comprender los mecanismos reguladores de los genes es crucial para descifrar los procesos de desarrollo.
  • Los modelos existentes se centran principalmente en los niveles de ARNm para predecir la producción de proteínas.

Objetivo del estudio:

  • Investigar los mecanismos de regulación genética de todo el genoma durante la diferenciación meiótica en levaduras en ciernes.
  • Para medir simultáneamente los niveles de ARNm, traducción y proteínas.

Principales métodos:

  • Medidas simultáneas de todo el genoma de ARNm, traducción y proteínas.
  • Análisis de la diferenciación meiótica en la levadura en ciernes.
  • Identificación de los niveles de ARNm y proteínas anticorrelacionadas.

Principales resultados:

  • Cientos de ARNm mostraron una anticorrelación con sus productos proteicos.
  • Más del 8% de los genes medidos (al menos 380) utilizan un nuevo mecanismo regulador.
  • Este mecanismo implica el cambio entre las isoformas de ARNm traducibles y no traducibles.
  • Un solo factor de transcripción puede coordinar la activación y la represión de la síntesis de proteínas.

Conclusiones:

  • La regulación génica durante el desarrollo implica un mecanismo generalizado que modula los niveles de proteínas a través de la conmutación de isoformas de transcripción.
  • El tipo de transcripción producida, no solo la inducción de ARNm, dicta la síntesis de proteínas.
  • Este descubrimiento ofrece una nueva perspectiva sobre la regulación genética post-transcripcional.