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Meiosis II02:02

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Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
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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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piRNA - Piwi-interacting RNAs02:57

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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...
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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Alternative RNA Splicing02:18

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Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
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Video Experimental Relacionado

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Detection of Alternative Splicing During Epithelial-Mesenchymal Transition
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PCID2 es esencial para la diferenciación de espermatogonias mediante la regulación del empalme alternativo

Feiyin Zhu1,2,3, Ying Zhang1,2, Yu Xi1,4

  • 1Center for Reproductive Medicine, Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing, 100191, China.

Cellular and molecular life sciences : CMLS
|January 12, 2026
PubMed
Resumen

La proteína que contiene el dominio PCI 2 (PCID2) es crucial para la fertilidad masculina. Los ratones knockout muestran infertilidad debido a una espermatogénesis alterada, lo que resalta la importancia de PCID2

Palabras clave:
empalme alternativoinfertilidad masculinaPCID2espermatogénesisdiferenciación de espermatogonias

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Área de la Ciencia:

  • Biología de la Reproducción
  • Biología Molecular
  • Genética

Sus antecedentes:

  • La espermatogénesis implica una compleja regulación transcripcional.
  • La proteína que contiene el dominio PCI 2 (PCID2) forma parte del complejo de transcripción-exportación 2 (TREX-2) y participa en el procesamiento de ARN.
  • El papel específico de PCID2 en la espermatogénesis no se comprende bien.

Objetivo del estudio:

  • Investigar las funciones fisiológicas de PCID2 en la espermatogénesis y la fertilidad masculina.
  • Elucidar los mecanismos moleculares por los cuales PCID2 influye en el desarrollo de las células germinales.

Principales métodos:

  • Generación de ratones knockout condicionales de la línea germinal (Pcid2-SKO) utilizando Stra8-Cre.
  • Análisis de transcriptoma de células únicas para identificar defectos de desarrollo.
  • Análisis de enriquecimiento de conjuntos de genes (GSEA) para analizar el enriquecimiento de vías.
  • Espectrometría de masas por inmunoprecipitación (IP-MS) y Co-inmunoprecipitación (Co-IP) para identificar proteínas interactuantes.
  • Secuenciación de ARN y PCR para identificar objetivos de empalme de PCID2.

Principales resultados:

  • Los ratones Pcid2-SKO son infértiles con apoptosis extensa de células germinales, diferenciación alterada de espermatogonias e iniciación fallida de la meiosis.
  • El análisis de células únicas reveló un arresto del desarrollo en la etapa de transición de espermatogonias.
  • La deficiencia de PCID2 disminuyó significativamente el enriquecimiento de la vía de empalme de ARNm en las células germinales.
  • PCID2 interactúa con SNRPG, hnRNPH1 y SF3B1, modulando el empalme alternativo.
  • Se identificaron cuatro genes clave (Prpf3, Nek3, Dvl2, Slc30a9) como objetivos de empalme de PCID2.

Conclusiones:

  • PCID2 es esencial para la espermatogénesis normal y la fertilidad masculina.
  • PCID2 regula el empalme alternativo (AS) de genes críticos involucrados en la progresión del ciclo celular, el ensamblaje del empalmosoma y la homeostasis mitocondrial.
  • Este estudio revela nuevos mecanismos moleculares de la espermatogénesis y enfatiza la importancia del AS en el desarrollo de las células germinales.