16186502

pubmed:Citation

40

To become mature alphabeta T cells, developing thymocytes must first assemble a T cell receptor (TCR) beta chain gene encoding a TCRbeta chain that forms a pre-TCR. These cells then need to generate a TCRalpha chain gene encoding a TCRalpha chain, which, when paired with the TCRbeta chain, forms a selectable alphabeta TCR. Newly generated VJalpha rearrangements that do not encode TCRalpha chains capable of forming selectable alphabeta TCRs can be excised from the chromosome and replaced with new VJalpha rearrangements. Such replacement occurs through the process of TCRalpha chain gene revision whereby a Valpha gene segment upstream of the VJalpha rearrangement is appended to a downstream Jalpha gene segment. A multistep, gene-targeting approach was used to generate a modified TCRalpha locus (TCRalpha(sJ)) with a limited capacity to undergo revision of TCRalpha chain genes. Thymocytes from mice homozygous for the TCRalpha(sJ) allele are defective in their ability to generate an alphabeta TCR. Furthermore, those thymocytes that do generate an alphabeta TCR have a diminished capacity to be positively selected, and TCRalpha(sJ/sJ) mice have significantly reduced numbers of mature alphabeta T cells. Together, these findings demonstrate that normal T cell development relies on the ability of developing thymocytes to revise their TCRalpha chain genes.

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http://linkedlifedata.com/resource/pubmed/journal/7505876

http://linkedlifedata.com/resource/pubmed/chemical/Bromodeoxyuridine, http://linkedlifedata.com/resource/pubmed/chemical/DNA Primers

Oct

pubmed-author:HuangChing-YuCY, pubmed-author:KanagawaOsamiO, pubmed-author:SleckmanBarry PBP

4

NLM

14356-61

pubmed-meshheading:16186502-Animals, pubmed-meshheading:16186502-Blotting, Northern, pubmed-meshheading:16186502-Blotting, Southern, pubmed-meshheading:16186502-Bromodeoxyuridine, pubmed-meshheading:16186502-DNA Primers, pubmed-meshheading:16186502-Flow Cytometry, pubmed-meshheading:16186502-Gene Rearrangement, T-Lymphocyte, pubmed-meshheading:16186502-Gene Targeting, pubmed-meshheading:16186502-Genes, T-Cell Receptor alpha, pubmed-meshheading:16186502-Mice, pubmed-meshheading:16186502-T-Lymphocytes, pubmed-meshheading:16186502-Thymus Gland

Revision of T cell receptor {alpha} chain genes is required for normal T lymphocyte development.

Journal Article, Comparative Study, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural