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T Cell Activation and Clonal Selection

T Cell Activation and Clonal Selection

T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...

Types of Selection

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...

Frequency-dependent Selection

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.

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Related Experiment Video

Updated: May 2, 2026

Examination of Thymic Positive and Negative Selection by Flow Cytometry

Examination of Thymic Positive and Negative Selection by Flow Cytometry

Published on: October 8, 2012

Theories and quantification of thymic selection.

Andrew J Yates¹

¹Departments of Systems and Computational Biology, Microbiology and Immunology, Albert Einstein College of Medicine , New York, NY , USA.

Frontiers in Immunology

|February 20, 2014

Summary

The thymus shapes the T cell repertoire using random T cell receptor (TCR) generation and selection processes. Quantitative modeling helps understand how these steps balance T cell diversity and self-tolerance.

Keywords:

T cells mathematical modeling repertoire selection theoretical biology thymic selection

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Area of Science:

Immunology
Computational Biology
Systems Biology

Background:

The peripheral T cell repertoire originates from thymic progenitor cells with randomly generated T cell receptors (TCRs).
Developmental and selection processes in the thymus eliminate T cells that are unresponsive or autoreactive to self-peptide-MHC complexes.

Purpose of the Study:

To review quantitative modeling approaches for understanding T cell repertoire development.
To elucidate how thymic selection kinetics and statistics shape T cell diversity and self-tolerance.

Main Methods:

Review of existing quantitative modeling studies.
Analysis of T cell development and selection processes.

Main Results:

Quantitative models are crucial for dissecting the complex interplay of factors governing T cell repertoire formation.
These models provide insights into achieving a balance between a diverse T cell repertoire and effective self-tolerance.

Conclusions:

Understanding T cell repertoire sculpting requires integrating knowledge of developmental kinetics and selection statistics.
Quantitative modeling offers a powerful framework for addressing fundamental questions in immunology.