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Clonal Deletion versus Clonal Diversion: Footprints of Self-Tolerance in the T Cell Repertoire

Objective

Self-tolerance is a key feature of the immune system; its failure causes autoimmune diseases such as Multiple Sclerosis or Type-1-Diabetes. Remarkably, T cell tolerance operates via two fundamentally different mechanisms: potentially dangerous cells are either eliminated (clonal deletion) or re-programmed to differentiate into regulatory T (Treg) cells (clonal diversion). Paradoxically, both tolerance modes can ensue from self-antigen-encounter in the thymus, and the parameters specifying these opposing cell-fates remain poorly understood. Moreover, the relative contribution of clonal deletion versus clonal diversion to tolerance at the level of diverse immune cell repertoires has not been determined. In particular, the paucity of antigen-specific cells is a major experimental obstacle to unravelling to what extent cells with shared autoreactive specificity, yet different T cell receptors (TCRs), are subject to either mode of tolerance.
Breakthroughs in visualizing minute cohorts of antigen-specific cells, characterizing the TCRs on individual cells and large-scale TCR sequencing now provide a unique opportunity to tackle these challenging questions. Based upon my expertise in thymus biology and T cell selection, I will exploit these technological advances to reveal where and how tolerance either generates ‘holes’ in the repertoire or diverts cells into a ‘benign’ sub-repertoire. The main objectives are (i) to identify and classify deleted or diverted TCR-entities through comparing ‘uncensored’ and ‘censored’ repertoires in the absence or presence of a disease-relevant autoantigen and (ii) to identify TCR intrinsic features as well as T cell extrinsic determinants that specify clonal deletion versus clonal diversion.
The proposed research elucidates a fundamental aspect of vertebrate immunology, but also has major implications regarding the therapeutic promise of harnessing endogenous, antigen-specific Treg cells in autoimmunity.

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Keywords

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Programme(s)

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Topic(s)

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Funding Scheme

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ERC-ADG - Advanced Grant

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Call for proposal

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(opens in new window) ERC-2016-ADG

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Host institution

LUDWIG-MAXIMILIANS-UNIVERSITAET MUENCHEN
Net EU contribution

Net EU financial contribution. The sum of money that the participant receives, deducted by the EU contribution to its linked third party. It considers the distribution of the EU financial contribution between direct beneficiaries of the project and other types of participants, like third-party participants.

€ 2 414 500,00
Address
GESCHWISTER SCHOLL PLATZ 1
80539 MUNCHEN
Germany

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Region
Bayern Oberbayern München, Kreisfreie Stadt
Activity type
Higher or Secondary Education Establishments
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Total cost

The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.

€ 2 414 500,00

Beneficiaries (1)

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