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The development of all multicellular organisms starts with the fusion of haploid cells called sperm and egg to form a diploid zygote. A zygote is a totipotent cell that can develop into a complete organism. The zygote undergoes cell division or cleavage to form an 8-cell mass. Until this stage, the cells are spherical, loosely attached, and remain totipotent. Totipotent cells are capable of developing both the embryonic and the extraembryonic tissues. However, as they continue to divide, they...
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Functional Modules in Gametogenesis.

Mariko Kikuchi1, Minoru Tanaka1

  • 1Laboratory of Reproductive Biology, Graduate School of Science, Nagoya University, Nagoya, Japan.

Frontiers in Cell and Developmental Biology
|June 13, 2022
PubMed
Summary
This summary is machine-generated.

Gametogenesis involves coordinated pathways initiating germ cell development after commitment. Distinct functional modules in germ cells explain diverse reproductive systems, like parthenogenesis and hermaphroditism.

Keywords:
folliculogenesisgametogenesisgerm cellmeiosissex

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Area of Science:

  • Developmental Biology
  • Reproductive Biology
  • Genetics

Background:

  • Gametogenesis, the production of eggs and sperm, is crucial for sexual reproduction.
  • Germ cells undergo significant changes in genomic size and sex-specific characteristics post-commitment.
  • The initial integration of diverse gametogenesis processes remains poorly understood.

Purpose of the Study:

  • To investigate how distinct gametogenesis pathways are initially integrated after germ cell commitment.
  • To explore the concept of functional modules in germ cell development.
  • To understand the evolutionary basis of diverse reproductive systems.

Main Methods:

  • Utilized the teleost fish medaka (Oryzias latipes) as a model organism.
  • Leveraged medaka's continuous gamete production in mature gonads and identified sexual switch genes.
  • Analyzed the cooperative initiation of distinct gametogenesis pathways.

Main Results:

  • Identified that distinct pathways cooperatively initiate gametogenesis after commitment.
  • Proposed the concept of "functional modules" where interlocked genes confer gamete characteristics.
  • Demonstrated that combinations of these modules can explain reproductive diversity.

Conclusions:

  • Gametogenesis initiation involves cooperative, distinct pathways forming functional modules.
  • Functional modules provide a framework for understanding the evolution of reproductive strategies like parthenogenesis and hermaphroditism.