Transcriptional control during T-cell development.

During the past few years, the essential role of distinct transcription factors in specifying cell-fate decisions in a stepwise fashion during T-cell differentiation has been revealed. One striking feature is that a single factor can act at several sites throughout T-cell development, possibly through interactions with different partners. The challenge is now to understand how these interactions can account for the co-ordination of complex extracellular signals and gene expression programs, such as those involved in T-cell receptor gene recombination and expression.