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Modeling the Size Spectrum for Macroinvertebrates and Fishes in Stream Ecosystems

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Published on: July 30, 2019

An extended steepness model for leg-size determination based on Dachsous/Fat trans-dimer system.

Hiroshi Yoshida¹, Tetsuya Bando², Taro Mito³

¹Faculty of Mathematics, Kyushu University, Motooka 744, Nishi-ku, Fukuoka, 819-0395, Japan.

Scientific Reports

|March 12, 2014

Summary

This study extends the steepness hypothesis to explain organ size. A new model using the Dachsous/Fat system in cricket leg regeneration provides a molecular basis for growth determination.

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Area of Science:

Developmental Biology
Regenerative Medicine
Cell Signaling

Background:

Organ size determination is a fundamental biological question.
The Dachsous/Fat (Ds/Ft) system, a cell-cell adhesion system, has been implicated in regulating tissue patterning and growth.
Lawrence et al. (2008) proposed the steepness hypothesis, linking Ds/Ft gradients to organ size control.

Purpose of the Study:

To extend the steepness hypothesis model for organ size determination.
To interpret experimental results in cricket leg regeneration using an extended model.
To provide a molecular-based explanation for organ size regulation.

Main Methods:

Development of an extended steepness model based on Ds/Ft dimer redistribution during cell division.
Assumption that growth cessation occurs when cell-cell dimer differentials fall below a threshold.
Simulation of cricket leg regeneration experiments using the extended model.

Main Results:

The extended steepness model qualitatively reproduced experimental results from cricket leg regeneration.
The model's predictions were consistent with data obtained via RNA interference in crickets.
The model offers a molecular mechanism for size control in intercalary regeneration.

Conclusions:

The extended steepness model provides a viable framework for understanding organ size determination.
The Dachsous/Fat system plays a crucial role in regulating organ size through cell division and dimer redistribution.
This research offers molecular insights into regenerative processes and overall organ size control.