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Related Concept Videos

Criteria for Causality: Bradford Hill Criteria - II01:28

Criteria for Causality: Bradford Hill Criteria - II

The Bradford Hill criteria serve as guidelines for establishing causative links in epidemiological research. Beyond Strength, Consistency, Specificity, and Temporality, key criteria also include Biological Gradient, Plausibility, Coherence, Experiment, and Analogy. These principles assist scientists in assessing the likelihood of causation in complex biological contexts. Below is a summary of these concepts:
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Criteria for Causality: Bradford Hill Criteria - I

The Bradford Hill criteria are a group of principles that provide a framework to determine a causal relationship between a specific factor and a disease. There are nine criteria that are pivotal in assessing causality in epidemiological studies. Here's a closer look at Strength, Consistency, Specificity, and Temporality criteria with definitions and examples:
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First Derivative Test: Problem Solving

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Quadratic Models

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Slant Asymptotes

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Related Experiment Videos

The Goodwin model: behind the Hill function.

Didier Gonze1, Wassim Abou-Jaoudé

  • 1Université Libre de Bruxelles, Bruxelles, Belgium. dgonze@ulb.ac.be

Plos One
|August 13, 2013
PubMed
Summary
This summary is machine-generated.

This study provides molecular mechanisms for the Goodwin model, a key system for understanding biological oscillations. Fast phosphorylation processes quantitatively explain the model

Related Experiment Videos

Area of Science:

  • Biochemistry
  • Systems Biology
  • Molecular Biology

Background:

  • The Goodwin model is a foundational system for understanding molecular oscillations.
  • It relies on a Hill function for repression, requiring high coefficients (>8) for oscillations, which are biologically challenging to explain.
  • Existing models often overlook the dynamics of post-translational modifications.

Purpose of the Study:

  • To present molecular models for the Goodwin model using phosphorylation/dephosphorylation mechanisms.
  • To demonstrate how these mechanisms can generate switch-like responses and oscillations.
  • To provide a mechanistic basis for the Goodwin model's parameters and dynamics.

Main Methods:

  • Developing molecular models based on single and multisite phosphorylation/dephosphorylation of transcription factors.
  • Analyzing the conditions under which these detailed mechanisms approximate the Goodwin model.
  • Investigating the role of phosphorylation/dephosphorylation speed in generating oscillations.

Main Results:

  • Multisite phosphorylation mechanisms quantitatively replicate Goodwin model oscillations when phosphorylation/dephosphorylation is rapid.
  • Conditions for approximating the Goodwin model with detailed mechanisms were identified.
  • A double phosphorylation/dephosphorylation mechanism explains a Goodwin model variant with bistability and relaxation oscillations.

Conclusions:

  • Molecular models based on phosphorylation/dephosphorylation provide a mechanistic basis for the Goodwin model.
  • The speed of post-translational modification processes is critical for biochemical oscillator dynamics.
  • This work bridges the gap between simplified models and complex molecular realities in biological oscillators.