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Related Concept Videos

Gonadal and Placental Hormones01:24

Gonadal and Placental Hormones

The gonads, namely the testes in males and the ovaries in females, are pivotal in producing gonadal hormones that orchestrate the intricate processes of sexual development and reproduction.
In males, testosterone is the primary gonadal androgen. It plays a central role in the maturation of male reproductive organs — the penis and testes. Additionally, testosterone is instrumental in the development of secondary sexual characteristics — a deep voice as well as facial and pubic hair growth — and...
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During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
Nondisjunction01:21

Nondisjunction

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers.  Nondisjunction is common during anaphase I or anaphase II of meiosis.  Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...
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...
Mate Choice01:20

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Mate choice—the decision about whom to mate with—is a type of natural selection, since animals must reproduce to pass down their genes. Mate choice is also called intersexual selection because the behavior occurs between the sexes.
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Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male reproductive...

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Effect of Male Accessory Gland Products on Egg Laying in Gastropod Molluscs
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Published on: June 22, 2014

Polyamines on the reproductive landscape.

Pavine L C Lefèvre1, Marie-France Palin, Bruce D Murphy

  • 1Centre de Recherche en Reproduction Animale, Faculté de Médecine Vétérinaire, Université de Montréal, 3200 rue Sicotte, Saint-Hyacinthe, Canada QC J2S 2M2.

Endocrine Reviews
|July 28, 2011
PubMed
Summary
This summary is machine-generated.

Polyamines like spermine, spermidine, and putrescine are vital for reproduction and development. Their absence causes infertility and developmental arrest, highlighting their essential biological roles.

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Area of Science:

  • Reproductive biology
  • Developmental biology
  • Cellular biology

Background:

  • Polyamines (spermine, spermidine, putrescine) are essential polycationic compounds.
  • They are crucial for male and female reproductive processes and embryo/fetal development.
  • Their absence leads to infertility and arrested embryogenesis.

Purpose of the Study:

  • To review the essential roles of polyamines in mammalian reproduction and development.
  • To highlight their involvement in spermatogenesis, ovulation, and embryo implantation.
  • To underscore the need for further research into polyamine regulatory mechanisms.

Main Methods:

  • Literature review of studies on polyamines in reproduction and development.
  • Analysis of research on polyamine synthesis, metabolism, and function.
  • Synthesis of findings from mammalian studies.

Main Results:

  • Polyamines regulate cell growth, gene expression, mitosis, and meiosis.
  • They are critical for spermatogenesis, sperm motility, ovarian follicle development, and steroidogenesis.
  • Polyamines are essential for embryo implantation, decidualization, placental formation, and preventing intrauterine growth retardation.

Conclusions:

  • Polyamines are indispensable for successful reproduction and fetal development.
  • Dietary polyamines and arginine may influence fertility.
  • Further investigation is needed to elucidate the precise mechanisms of polyamine action.