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- Title
Cell-type-specific contacts to immunoglobulin enhancers in nuclei.
- Authors
Church, George M.; Ephrussi, Anne; Gilbert, Walter; Tonegawa, Susumu
- Abstract
The introns separating the variable and constant regions of active immunoglobulin genes contain tissue-specific transcriptional enhancer elements1-3, DNA segments which act in cis in an orientation and distanceindependent (up to a few kilobases (kb)) manner to enhance transcription initiation at adjacent promoters4-9. The immunoglobulin heavy-chain enhancer is active only in lymphoid cells: in transfection assays it is capable of controlling in cis transcription from the simian virus 40 (SV40) T-antigen, rabbit β-globin and immunoglobulin gene promoters up to at least 2 kb away1-3. Genetic deletion analysis suggests that a region of as few as 140 base pairs (bp) is sufficient for the enhancement effect1,2. These functional characteristics and DNA sequences are conserved between mouse and man10-15. However, it is riot known whether tissue-specific proteins bind to the enhancer. Proteins that interact with DNA at specific sequences can prevent or enhance the reactions of individual guanines or adenines with dimethyl sulphate (DMS)16, and this property has been used to display the DNA contacts of various regulatory proteins16-26. Here we apply this DMS strategy in experiments involving single-copy genes within intact mammalian nuclei using genomic sequencing27.
- Publication
Nature, 1985, Vol 313, Issue 6005, p798
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/313798a0