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Whole Body Regeneration

Whole Body Regeneration

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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Related Experiment Video

Updated: Aug 8, 2025

Pharmacological and Functional Genetic Assays to Manipulate Regeneration of the Planarian Dugesia japonica

Pharmacological and Functional Genetic Assays to Manipulate Regeneration of the Planarian Dugesia japonica

Published on: August 31, 2011

A Simple Method for Quantifying Blastema Growth in Regenerating Planarians.

Natali Campillo¹, Danielle Ireland¹, Yashvi Patel²

¹Department of Biology, Swarthmore College, Swarthmore, Pennsylvania.

Current Protocols

|March 6, 2023

Summary

This summary is machine-generated.

Freshwater planarians offer a model for studying chemical toxicity effects on regeneration. New protocols quantify blastema growth rates, providing a more sensitive measure of regeneration defects than qualitative assessments.

Keywords:

Dugesia japonica blastema flatworm growth rate image analysis morphology regeneration

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Related Experiment Videos

Last Updated: Aug 8, 2025

Pharmacological and Functional Genetic Assays to Manipulate Regeneration of the Planarian Dugesia japonica

Pharmacological and Functional Genetic Assays to Manipulate Regeneration of the Planarian Dugesia japonica

Published on: August 31, 2011

Planarian Immobilization, Partial Irradiation, and Tissue Transplantation

Planarian Immobilization, Partial Irradiation, and Tissue Transplantation

Published on: August 6, 2012

Surgical Ablation Assay for Studying Eye Regeneration in Planarians

Surgical Ablation Assay for Studying Eye Regeneration in Planarians

Published on: April 14, 2017

Area of Science:

Developmental Biology
Toxicology
Regenerative Medicine

Background:

Freshwater planarians possess remarkable regenerative capabilities, making them ideal models for studying stem cell biology and regeneration.
Previous toxicity assessments relied on qualitative observation of head and eye regeneration, which can only detect severe defects.
Quantitative methods are needed to accurately assess subtle regeneration defects caused by chemical exposure.

Purpose of the Study:

To present novel protocols for quantifying blastema growth rate in regenerating planarians.
To establish a more sensitive method for assessing chemical toxicity by measuring regeneration defects.
To provide adaptable protocols suitable for both research and undergraduate teaching settings.

Main Methods:

Step-by-step imaging protocols for monitoring planarian regeneration over several days.
Quantitative analysis of blastema size using freeware (ImageJ) and standard image analysis techniques.
Calculation of blastema growth rate through linear curve fitting in spreadsheet software.

Main Results:

Developed and validated protocols for quantifying blastema growth rate in regenerating planarians.
Demonstrated that blastema growth rate provides a sensitive measure of regeneration defects.
The protocols are easy to implement, low-cost, and adaptable to different species and wound sites.

Conclusions:

Quantifying blastema growth rate offers a superior method for assessing chemical toxicity compared to qualitative measures.
These protocols enhance the utility of planarians as a model system for toxicology and regeneration research.
The accessibility of these methods makes them valuable for educational purposes in regenerative biology.