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B-1a cells acquire their unique characteristics by bypassing the pre-BCR selection stage

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Item Type:Preprint
Title:B-1a cells acquire their unique characteristics by bypassing the pre-BCR selection stage
Creators Name:Wong, J.B. and Hewitt, S.L. and Heltemes-Harris, L.M. and Mandal, M. and Johnson, K. and Rajewsky, K. and Koralov, S.B. and Clark, M.R. and Farrar, M.A. and Skok, J.A.
Abstract:B-1a cells are long-lived, self-renewing innate like B cells that predominantly inhabit the peritoneal and pleural cavities. In contrast to conventional B-2 cells they have a receptor repertoire that is biased towards bacterial and self-antigens, promoting a rapid response to infection and clearing of apoptotic cells. Although B-1a cells are known to primarily originate from fetal tissues the mechanisms by which they arise has been a topic of debate for many years. Here we show that in the fetal liver (FL) versus bone marrow (BM) environment, reduced IL-7R/STAT5 levels promote immunoglobulin kappa (Igk) recombination at the early pro-B cell stage. As a result, B cells can directly generate a mature B cell receptor (BCR) and bypass the requirement for a pre-BCR and pairing with surrogate light chain (SLC). This 'alternate pathway' of development enables the production of B cells with self reactive, skewed specificity receptors that are peculiar to the B-1a compartment. Together our findings connect seemingly opposing models of B-1a cell development and explain how these cells acquire their unique properties.
Keywords:Igk Recombination, B-1a Cell Development, IL-7R/STAT5 Signaling, Surrogate Light Chain, Autoreactive Receptors
Source:bioRxiv
Publisher:Cold Spring Harbor Laboratory (U.S.A.)
Article Number:214908
Date:13 November 2017
Official Publication:https://doi.org/10.1101/214908
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https://edoc.mdc-berlin.de/18480/Final version

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