Replication Timing of CD4 and CD8 in Single-Positive Peripheral Blood Lymphocytes

The regulatory events leading to the mutually exclusive expression of CD4 and CD8 on peripheral lymphocytes are not fully understood. In particular, the association between DNA replication timing and transcriptional activity of these genes has not been previously investigated. Here, the replication...

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Bibliographic Details
Published in:Cellular immunology 1999-11, Vol.198 (1), p.61-68
Main Authors: Hibbard, Michele K., Strehl, Sabine, Lalande, Marc
Format: Article
Language:English
Subjects:
AIDS/HIV
beta 2-Microglobulin - genetics
CD4 antigen
CD4 Antigens - biosynthesis
CD4 Antigens - genetics
CD4-Positive T-Lymphocytes - immunology
CD4-Positive T-Lymphocytes - metabolism
CD8 antigen
CD8 Antigens - biosynthesis
CD8 Antigens - genetics
CD8-Positive T-Lymphocytes - immunology
CD8-Positive T-Lymphocytes - metabolism
Cell Separation
Cells, Cultured
DNA Replication - genetics
DNA Replication - immunology
Genetic Markers - immunology
Humans
Immunophenotyping
T-Lymphocyte Subsets - cytology
T-Lymphocyte Subsets - immunology
T-Lymphocyte Subsets - metabolism
Time Factors
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Summary:The regulatory events leading to the mutually exclusive expression of CD4 and CD8 on peripheral lymphocytes are not fully understood. In particular, the association between DNA replication timing and transcriptional activity of these genes has not been previously investigated. Here, the replication kinetics of the CD4 and CD8 loci in mature single-positive T-cell populations have been examined using a novel approach to the separation of CD4+ or CD8+ lymphocytes into discrete cell cycle fractions and a competitive PCR replication timing assay. While the timing of replication of each of these loci is independent of their expression in mature CD4 or CD8 single positive T-cells, the replication of CD8, but not of CD4, shifts to a later time in S phase in transcriptionally silent HS68 fibroblast cells. These findings suggest that changes in DNA replication timing are associated with the developmentally regulated but not with the tissue-specific expression of CD4 and CD8.
ISSN:0008-8749
1090-2163
DOI:10.1006/cimm.1999.1582