Abstract
Close examination of how the CD4 and CD8 genes are regulated during T lymphocyte development, not only in the thymus but also in secondary lymphoid organs, has provided with valuable insight into mechanisms of lineage specification. Studies in this area promise to uncover how helper versus cytotoxic T cells differentiate, and, possibly, even how effector T cells give rise to subsets of long-lived memory T cells with specialized activation properties. In a more general sense, examination of these loci has provided a unique opportunity to study epigenetic regulation in vertebrate development. The CD4 locus remains the only vertebrate gene currently shown to undergo developmentally regulated epigenetic silencing, and as such, it presents an ideal system for analyzing how heterochromatin is established during developmental processes in higher eukaryotes.
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