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Related Concept Videos

Oogenesis01:22

Oogenesis

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Oogenesis,  the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
Each primary oocyte is surrounded by a layer of pre-granulosa cells, forming what is...
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Oogenesis02:07

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In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
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Folliculogenesis is the development of ovarian follicles, the specialized structures within the ovarian cortex where oogenesis, or egg development, occurs. This process is essential for female reproductive health and begins during fetal development when primordial follicles are formed. Each primordial follicle comprises a primary oocyte in the center, surrounded by a single layer of squamous pre-granulosa cells. These follicles remain dormant in late prophase I of meiosis until triggered by...
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Operon Model01:23

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The operon model represents a fundamental mechanism of gene regulation in prokaryotes, enabling coordinated expression of genes involved in related metabolic or functional pathways. Operons consist of structural genes, a promoter, and an operator, with transcription regulated by repressors, activators, and small effector molecules.Structure and Function of OperonsAn operon is a cluster of structural genes transcribed together under the control of a single promoter. The promoter region...
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Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by...
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The Nucleolus02:55

The Nucleolus

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The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...
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Related Experiment Video

Updated: Dec 9, 2025

Production and Use of Customizable Agarose Molds for Scaffold-Free Mouse Ovarian Follicle Culture
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Production and Use of Customizable Agarose Molds for Scaffold-Free Mouse Ovarian Follicle Culture

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OPG Production Matters Where It Happened.

Masayuki Tsukasaki1, Tatsuo Asano1, Ryunosuke Muro1

  • 1Department of Immunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, 113-0033 Tokyo, Japan.

Cell Reports
|September 9, 2020
PubMed
Summary
This summary is machine-generated.

Local osteoprotegerin (OPG) production, not circulating levels, is vital for bone and immune health. This study reveals OPG acts locally, highlighting tissue-specific regulation of the RANKL system.

Keywords:
M cellOPGRANKRANKLbone metabolismintestinal homeostasismTECosteoblastosteoclastthymic microenvironment

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Area of Science:

  • Immunology
  • Endocrinology
  • Bone Biology

Background:

  • Osteoprotegerin (OPG) is a key regulator of the RANKL pathway, influencing bone and immune cell differentiation.
  • The systemic versus local function of OPG has remained unclear.

Purpose of the Study:

  • To investigate the cellular source and functional significance of OPG in maintaining tissue homeostasis.
  • To determine if OPG acts locally at its production site or systemically via circulation.

Main Methods:

  • Generation of OPG-floxed mice to enable conditional gene deletion.
  • Targeted deletion of OPG in osteoblastic cells and analysis of bone density.
  • Assessment of immune cell populations (mTECs, M cells) following OPG deletion.

Main Results:

  • Deletion of OPG in osteoblastic cells resulted in severe osteopenia, independent of serum OPG levels.
  • Loss of locally produced OPG led to increased numbers of medullary thymic epithelial cells (mTECs) and intestinal microfold cells (M cells).
  • Serum OPG levels remained normal despite alterations in local OPG production and downstream cellular effects.

Conclusions:

  • Locally produced OPG is critical for maintaining bone and immune homeostasis.
  • OPG exerts its functions primarily at its site of production, rather than through systemic circulation.
  • These findings underscore the importance of localized RANKL system regulation.