Abstract：
:Communication between distal chromosomal elements is essential for control of many nuclear processes. For example, genes in higher eukaryotes often require distant enhancer sequences for high-level expression. The mechanisms proposed for long-range enhancer action fall into two basic categories. Non-contact models propose that enhancers act at a distance to create a favorable environment for gene transcription, or act as entry sites or nucleation points for factors that ultimately communicate with the gene. Contact models propose that communication occurs through direct interaction between the distant enhancer and the gene by various mechanisms that 'loop out' the intervening sequences. Although much attention has focused on contact models, the existence and nature of long-range interactions is still controversial and speculative, as there is no direct evidence that distant sequences physically interact in vivo. Here, we report the development of a widely applicable in situ technique to tag and recover chromatin in the immediate vicinity of an actively transcribed gene. We show that the classical enhancer element, HS2 of the prototypical locus control region (LCR) of the beta-globin gene cluster, is in close physical proximity to an actively transcribed HBB (beta-globin) gene located over 50 kb away in vivo, suggesting a direct regulatory interaction. The results give unprecedented insight into the in vivo structure of the LCR-gene interface and provide the first direct evidence of long-range enhancer communication.
journal_name
Nat Genetjournal_title
Nature geneticsauthors
Carter D,Chakalova L,Osborne CS,Dai YF,Fraser Pdoi
10.1038/ng1051keywords:
subject
Has Abstractpub_date
2002-12-01 00:00:00pages
623-6issue
4eissn
1061-4036issn
1546-1718pii
ng1051journal_volume
32pub_type
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