Memories of lost enhancers.
Transcriptional enhancers are key determinants of developmentally regulated gene expression. Models of enhancer function must distinguish between analog or digital control of transcription, as well as their requirement to initiate or maintain transcriptional activity of a gene. In light of a recent study by Chong and colleagues (pp. 659-669) providing evidence of a transient requirement of an enhancer associated with the CD4 gene, we discuss possible mechanisms by which transcriptional memory can be propagated in the absence of enhancers.
Sen
Ranjan
R
Laboratory of Cellular and Molecular Biology, National Institute of Aging, Baltimore, Maryland 21224, USA. rs465z@nih.gov
Grosschedl
Rudolf
R
D000818:Animals; D044127:Epigenesis, Genetic / Q000235:genetics; D006801:Humans; D051379:Mice; D008957:Models, Genetic; D014157:Transcription Factors / Q000235:genetics*; D014158:Transcription, Genetic / Q000235:genetics*
D014157:Transcription Factors