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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.
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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,...
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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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Cross talk during the periconception period.

Alireza Fazeli1, William V Holt1

  • 1Department of Oncology & Metabolism, Academic Unit of Reproductive and Developmental Medicine, The University of Sheffield, Sheffield, UK.

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|May 11, 2016
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Summary
This summary is machine-generated.

Maternal communication with gametes and embryos fine-tunes reproduction and offspring epigenetics. Understanding this crucial cross talk offers new fertility treatments and epigenomic insights.

Keywords:
EmbryoFallopian tubeOocyteOviductPericonceptionSpermatozoa

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Area of Science:

  • Reproductive Biology
  • Epigenetics
  • Developmental Biology

Background:

  • Reproductive events are precisely regulated by interactions between gametes, embryos, and the female reproductive tract.
  • These interactions significantly impact offspring epigenetics and long-term health.
  • Recent research has begun to uncover the mechanisms of this maternal-fetal communication.

Purpose of the Study:

  • To review recent investigations into the cross talk between the female reproductive tract, gametes, and embryos.
  • To highlight key requirements for understanding maternal communication with reproductive cells.
  • To propose hypotheses on how the female reproductive tract recognizes gametes and embryos.

Main Methods:

  • Literature review of recent reproductive biology and epigenetics research.
  • Synthesis of current understanding regarding maternal-gamete-embryo interactions.
  • Formulation of hypotheses based on existing data.

Main Results:

  • The cross talk is essential for reproductive success and influences offspring epigenetics.
  • Understanding this communication requires further investigation into specific molecular signals.
  • Two hypotheses are proposed regarding the recognition mechanisms employed by the female reproductive tract.

Conclusions:

  • Deciphering the maternal-gamete-embryo cross talk is vital for reproductive health.
  • This knowledge can lead to novel strategies for enhancing fertility.
  • Potential exists to modulate offspring epigenomic profiles for improved adult health.