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Related Concept Videos

Whole Body Regeneration01:33

Whole Body Regeneration

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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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Overview of Regeneration and Repair01:19

Overview of Regeneration and Repair

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Regeneration and repair processes are critical in healing damages caused by injury, disease, and aging. In regeneration, the damaged tissue is entirely replaced with new growth that restores the original architecture and function. In contrast, tissue repair usually results in a fixed tissue architecture involving scar formation. Scars generally do not reestablish tissue function and may also exhibit structural abnormalities at the injury site.
Regeneration
All animals have varying degrees of...
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Unrenewable Cells00:50

Unrenewable Cells

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In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
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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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Stem Cell Therapy for Tissue Regeneration01:21

Stem Cell Therapy for Tissue Regeneration

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Stem cell therapy is a method used in regenerative medicine to repair and restore function to damaged tissues and organs. Stem cells have the potential to proliferate and differentiate into various tissue types, making them ideal candidates for tissue regeneration. For example, hematopoietic stem cell transplants are commonly used in blood cancer treatment to replenish damaged bone marrow and restore healthy blood cells.
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The two main cell...
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Multipotency and Niche of Bulge Stem Cell01:06

Multipotency and Niche of Bulge Stem Cell

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A hair follicle or HF is a small part of the skin that produces the hair shaft. Paul Gerson Unna was the first to observe a bulge in the human hair follicle's outer root sheath (ORS). The bulge is present between the sebaceous gland and the arrector pili muscle and is the niche for hair follicle stem cells (HFSCs). The bulge is also a niche for melanocyte stem cells, and their loss results in graying of hair. The HFSCs express Sox9 and Lhx2, which help them maintain stemness and prevent...
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Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

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A parenchymal niche regulates pluripotent stem cell function in planarians.

bioRxiv : the preprint server for biology·2025
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Combinatorial mechanisms specify cellular location and neurotransmitter identity during regeneration of planarian neurons.

bioRxiv : the preprint server for biology·2025
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Planarian LDB and SSDP proteins scaffold transcriptional complexes for regeneration and patterning.

Developmental biology·2024
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In preprints: allometry of cell types during animal growth and degrowth.

Development (Cambridge, England)·2024
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Ets-1 transcription factor regulates glial cell regeneration and function in planarians.

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Planarian LDB and SSDP proteins scaffold transcriptional complexes for regeneration and patterning.

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Related Experiment Video

Updated: Sep 16, 2025

De Novo Generation of Somatic Stem Cells by YAP/TAZ
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De Novo Generation of Somatic Stem Cells by YAP/TAZ

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Development: Growing up to become a regenerative powerhouse.

Rachel H Roberts-Galbraith1

  • 1Department of Cellular Biology, University of Georgia, Athens, GA 30602, USA.

Current Biology : CB
|July 8, 2025
PubMed
Summary

Planarian flatworms regenerate after injury by reestablishing anterior polarity. This ability develops late in planarian embryogenesis, enabling their remarkable regenerative capacity.

Area of Science:

  • Developmental Biology
  • Regenerative Medicine
  • Planarian Biology

Background:

  • Adult planarians exhibit remarkable whole-body regeneration following injury.
  • Understanding the developmental basis of regeneration is crucial for regenerative medicine.

Purpose of the Study:

  • To investigate the developmental timing of regenerative capacity in planarians.
  • To determine when planarians acquire the ability to reestablish anterior polarity during embryogenesis.

Main Methods:

  • Observational studies on planarian embryogenesis.
  • Analysis of polarity establishment during development.

Main Results:

  • Planarians develop their regenerative abilities late in embryogenesis.

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  • The capacity for reestablishing anterior polarity emerges late in development, preceding robust regeneration.

    • Conclusions:

    • Late-emerging anterior polarity is a prerequisite for planarian whole-body regeneration.
    • Developmental timing significantly influences the onset of regenerative capabilities in planarians.