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Zygotic Development And Stem Cell Formation01:10

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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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Regeneration is the process of restoring injured or lost tissues, organs, or body parts. While simpler organisms generally show greater ability to regenerate their whole body, few complex animals show similarly exceptional regeneration. For example, planarian flatworms have a unique regenerative potential making them a popular study organism among biologists to understand the mechanisms of whole body regeneration. Other organisms, such as hydra, also show extreme regeneration potential;...
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Organ Evolution: Emergence of Multicellular Function.

Joseph Parker1

  • 1Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, California, USA;

Annual Review of Cell and Developmental Biology
|July 3, 2024
PubMed
Summary
This summary is machine-generated.

This study proposes a framework for understanding how simple cell cooperation evolves into complex organs. It highlights functional niche creation and cell interdependencies as key drivers of multicellular evolution and organ complexity.

Keywords:
cell typesdivision of laborevolutiongene expression programsmulticellularityorgans

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Area of Science:

  • Evolutionary biology
  • Developmental biology
  • Cellular biology

Background:

  • Multicellularity enables complex organs through cell cooperation, but the evolutionary origins of organs remain poorly understood.
  • Understanding organ development requires insights into how distinct cell types arise and coordinate functions.
  • Existing research lacks a comprehensive framework for the transition from unicellular to multicellular organization and organ complexity.

Purpose of the Study:

  • To propose a novel framework explaining the evolutionary transition from cell cooperation to organ formation.
  • To elucidate the molecular mechanisms underlying the establishment of division of labor between cell types.
  • To provide a conceptual model for understanding the emergence of irreversible cell interdependencies in multicellular organisms.

Main Methods:

  • Conceptual framework development based on evolutionary and developmental biology principles.
  • Integration of insights from single-cell transcriptomics and terminal cell fate specification studies.
  • Analysis of gene expression programs as modular units of functional variation.

Main Results:

  • A proposed framework for cell-to-organ transitions emphasizes functional niche creation and cell-type subfunctionalization.
  • Division of labor originates and solidifies through the irreversible ratcheting of cell interdependencies.
  • Modular gene expression programs can be deployed, combined, or partitioned to drive multicellular innovation.

Conclusions:

  • The proposed framework offers a mechanistic and conceptual understanding of organ evolution.
  • Tracing the evolution of gene expression programs at the single-cell level can reveal pathways to organ complexity.
  • This research provides a foundation for future studies on the molecular underpinnings of multicellularity and organogenesis.