CaltechAUTHORS
  A Caltech Library Service

Differential Transcriptional Regulation of Individual TCR V Segments Before Gene Rearrangement

Chen, Fei and Rowen, Lee and Hood, Lee and Rothenberg, Ellen V. (2001) Differential Transcriptional Regulation of Individual TCR V Segments Before Gene Rearrangement. Journal of Immunology, 166 (3). pp. 1771-1780. ISSN 0022-1767. https://resolver.caltech.edu/CaltechAUTHORS:20170213-104935777

[img] PDF - Published Version
Restricted to Caltech community only
See Usage Policy.

2431Kb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20170213-104935777

Abstract

The promoter sequences of individual murine TCR Vβ segments are dissimilar, but any functional differences between them are masked after productive gene rearrangement by the dominance of the TCRβ 3′ enhancer. However, thymocytes of recombination-activating gene-2 (Rag2)-deficient mice allow the transcriptional activity of Vβ promoters to be studied before rearrangement. Here we report that many Vβ segments are detectably transcribed in Rag2^(−/−) thymocytes and that there are significant differences in expression among different Vβ segments. Primer extension and characterization of cDNA clones from SCID thymocytes suggest that these germline Vβ transcripts generally use the same start sites as those previously determined in mature T cells. The strength of expression before rearrangement does not correlate with proximity to the known enhancer, because members of the most distal Vβ cluster (Vβ2.1, Vβ1.1, Vβ4.1) are relatively strongly expressed and more proximal Vβ segments (Vβ14.1, Vβ3.1, Vβ7.1, Vβ6.1) are only weakly expressed. Different Vβ segments also show different developmental programs of activation in different thymocyte subsets, with the Vβ5.1(L)-8.2(V) spliced transcript expressed earliest as well as most strongly overall. Comparison with Rag^+ MHC class I^(−/−) and class II^(−/−) thymocytes confirms that many of these expression differences are leveled by rearrangement and/or by β selection, before MHC-dependent selection. However, the expression pattern of Vβ2.1 is highly distinctive and includes cell types apparently outside the T lineage, suggesting potential acquisition of specialized roles.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.4049/jimmunol.166.3.1771DOIArticle
http://www.jimmunol.org/content/166/3/1771.fullPublisherArticle
ORCID:
AuthorORCID
Hood, Lee0000-0001-7158-3678
Rothenberg, Ellen V.0000-0002-3901-347X
Additional Information:© 2001 The American Association of Immunologists. Received for publication October 10, 2000. Accepted for publication November 15, 2000. This work was supported by the DNA Sequencer Royalty Fund at Caltech. We thank Michele Anderson for the arrayed cDNA library from SCID thymocytes; Hua Wang for samples of sorted mutant thymocyte populations; Rochelle Diamond for expert assistance with the cell separations; Janice Telfer and Mary Yui for samples of fresh and IL-2 stimulated NK cells; Gabriela Hernandez-Hoyos for transgenic T cells expressing the AND-TCR; and members of the Rothenberg laboratory for valuable advice and suggestions. We also thank Ellen Robey (University of California, Berkeley, CA) for the gift of the MHC-deficient mouse breeding stock. This work was also made possible by the Caltech Biopolymer Synthesis Facility; by the Caltech Flow Cytometry and Cell Sorting Facility; and by Dana Miller and, later, employees of the Office of Laboratory Animal Research at Caltech who provided excellent care of the immunodeficient mice.
Funders:
Funding AgencyGrant Number
DNA Sequencer Royalty Fund, CaltechUNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20170213-104935777
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170213-104935777
Official Citation:Differential Transcriptional Regulation of Individual TCR Vβ Segments Before Gene Rearrangement Fei Chen, Lee Rowen, Lee Hood, Ellen V. Rothenberg The Journal of Immunology February 1, 2001, 166 (3) 1771-1780; DOI: 10.4049/jimmunol.166.3.1771
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74236
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:13 Feb 2017 19:55
Last Modified:03 Oct 2019 16:36

Repository Staff Only: item control page