Cited by 175T-cell and B-cell ImmunologyArtificial Immune Systems ApplicationsEvolution and Genetic Dynamics

How many TCR clonotypes does a body maintain?

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Lythe, Grant, Callard, Robin E., Hoare, Rollo L., Molina-París, Carmen·2016·Journal of Theoretical Biology

Abstract

We consider the lifetime of a T cell clonotype, the set of T cells with the same T cell receptor, from its thymic origin to its extinction in a multiclonal repertoire. Using published estimates of total cell numbers and thymic production rates, we calculate the mean number of cells per TCR clonotype, and the total number of clonotypes, in mice and humans. When there is little peripheral division, as in a mouse, the number of cells per clonotype is small and governed by the number of cells with identical TCR that exit the thymus. In humans, peripheral division is important and a clonotype may survive for decades, during which it expands to comprise many cells. We therefore devise and analyse a computational model of homeostasis of a multiclonal population. Each T cell in the model competes for self pMHC stimuli, cells of any one clonotype only recognising a small fraction of the many subsets of stimuli. A constant mean total number of cells is maintained by a balance between cell division and death, and a stable number of clonotypes by a balance between thymic production of new clonotypes and extinction of existing ones. The number of distinct clonotypes in a human body may be smaller than the total number of naive T cells by only one order of magnitude.

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Crossref · 10.1016/j.jtbi.2015.10.016

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  • This estimate is consistent with TREC frequencies and with modeling predicting that the number of distinct human TCR sequences is only one order of magnitude lower than the number of total naive cells.

    “This estimate is consistent with TREC frequencies as well as with modeling experiments which predict that the number of distinct sequences in humans is by only one order of magnitude lower than the number of total naive cells”

    From Successful and Maladaptive T Cell Aging (2017) · cites this paper as Lythe et al., 2016

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Authors
Lythe, G., Callard, R. E., Hoare, R. L., & Molina-París, C.
Affiliations
  • University of Leeds (GB)
  • University College London (GB)
Corresponding author
Lythe, Grant
Venue
Journal of Theoretical Biology
Publisher
Elsevier BV
Published
2016-01
Volume
389
Pages
214-224
ISSN
0022-5193 (ISSN-L)
OpenAlex
W2141312574
Cited by
175
References
134
Citations by year
2026: 10 · 2025: 13 · 2024: 14 · 2023: 25 · 2022: 26 · 2021: 22 · 2020: 22 · 2019: 15 · 2018: 13 · 2017: 11 · 2016: 4
FWCI
4.59
Type
journal article
Language
en
Open access
Locations
  • Journal of Theoretical Biology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • White Rose Research Online (University of Leeds, The University of Sheffield, University of York) (acceptedVersion)
  • UCL Discovery (University College London) (submittedVersion)
Funders
BBSRC Research Development Fellowship (BB/G023395/1)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
  • Physical Sciences › Engineering › Biomedical Engineering › Artificial Immune Systems Applications
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
Keywords
T cell clonotypes, T cell receptor repertoire, thymic output, naive T cells
MeSH terms
Algorithms, Animals, Cell Division, Computer Simulation, Homeostasis, Humans, Immunologic Memory, Models, Theoretical, Receptors, Antigen, T-Cell, Stochastic Processes, T-Lymphocytes, Thymus Gland, Mice

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