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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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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.
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The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.
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Updated: Apr 4, 2026

Production and Use of Customizable Agarose Molds for Scaffold-Free Mouse Ovarian Follicle Culture
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Ovary-Derived Signals Align Protein Appetite with Oogenesis.

R R Nóbrega1, A P Francisco1, A M Gontijo2,3

  • 1Organismal Metabolic Physiology, GIMM - Gulbenkian Institute for Molecular Medicine, Lisbon, Portugal.

Biorxiv : the Preprint Server for Biology
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Summary
This summary is machine-generated.

The ovary influences yeast appetite in fruit flies by altering oogenesis progression. Disruptions in egg development signal nutrient needs, impacting feeding behavior.

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Area of Science:

  • Reproductive Biology
  • Neuroscience
  • Metabolism

Background:

  • Organismal homeostasis relies on coordinating organ metabolism with nutrient intake.
  • Central hunger pathways are known, but peripheral organ influence on nutrient-specific appetite is unclear.

Purpose of the Study:

  • Identify novel signaling axes linking peripheral organ physiology to nutrient-specific appetite.
  • Investigate the ovary's role in modulating feeding behavior in Drosophila melanogaster.

Main Methods:

  • Conducted a targeted germline RNAi screen in Drosophila melanogaster.
  • Analyzed oogenesis progression, including vitellogenic follicle accumulation and mature oocyte counts.
  • Assessed the role of the relaxin-like hormone Dilp8 and mating status.

Main Results:

  • Ovarian perturbations disrupting oogenesis selectively increased yeast appetite.
  • Decreased expression of Dilp8 correlated with increased yeast appetite.
  • Ovarian regulation of appetite was independent of amino acid status but required mating.

Conclusions:

  • Uncovered a novel signaling axis from the ovary regulating nutrient-specific appetite in fruit flies.
  • Demonstrated the ovary's role as an active regulator of whole-organism nutritional decisions.
  • Proposed a framework for reproductive tissue communication of physiological demands and potential conserved mechanisms in other animals.