title: Identification of differentially expressed genes in human memory (CD45RO+) CD4+ T lymphocytes.
abstract: The precise nature and development of the memory (CD45RO+) CD4+ T lymphocytes remain unknown. In this study, we analyzed differential gene expression of human memory CD4+ T lymphocytes in relation to their naive counterparts. A suppression subtractive hybridization technique was used to isolate and clone differentially expressed genes in the memory subset with respect to the naive subset. We screened approximately 300 clones by dot blot analysis and sequenced 23 differentially expressed clones. GenBank sequence homology search showed that these clones included genes for transcription factors, enzymes and immunomodulatory molecules. Differential expression of a subset of these genes was further confirmed by RT-PCR and densitometric analysis revealed that they were expressed five to eightfold more in memory than naive CD4+ T lymphocytes. Collectively, these results suggest that multiple genes with different functions contribute to the development of immunological memory in human T lymphocytes.
authors.affiliation: Department of Cell Biology and Molecular Genetics, University of Maryland, College Park 20742, USA.
authors.forename: V G
authors.initials: VG
authors.lastname: Warke
authors.forename: S
authors.initials: S
authors.lastname: Krishnan
authors.forename: M P
authors.initials: MP
authors.lastname: Nambiar
authors.forename: D L
authors.initials: DL
authors.lastname: Farber
authors.forename: G C
authors.initials: GC
authors.lastname: Tsokos
authors.forename: H K
authors.initials: HK
authors.lastname: Wong
mesh_terms: D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D002999:Clone Cells; D018076:DNA, Complementary; D015870:Gene Expression; D006801:Humans; D007156:Immunologic Memory; D017493:Leukocyte Common Antigens; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D018076:DNA, Complementary; D017493:Leukocyte Common Antigens