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We have analyzed the pattern of core histone acetylation across 250 kb of the telomeric region of the short arm of human chromosome 16. This gene-dense region, which includes the alpha-globin genes and their regulatory elements embedded within widely expressed genes, shows marked differences in histone acetylation between erythroid and non-erythroid cells. In non-erythroid cells, there was a uniform 2- to 3-fold enrichment of acetylated histones, compared with heterochromatin, across the entire region. In erythroid cells, an approximately 100-kb segment of chromatin encompassing the alpha genes and their remote major regulatory element was highly enriched in histone H4 acetylated at Lys-5. Other lysines in the N-terminal tail of histone H4 showed intermediate and variable levels of enrichment. Similar broad segments of erythroid-specific histone acetylation were found in the corresponding syntenic regions containing the mouse and chicken alpha-globin gene clusters. The borders of these regions of acetylation are located in similar positions in all three species, and a sharply defined 3' boundary coincides with the previously identified breakpoint in conserved synteny between these species. We have therefore demonstrated that an erythroid-specific domain of acetylation has been conserved across several species, encompassing not only the alpha-globin genes but also a neighboring widely expressed gene. These results contrast with those at other clusters and demonstrate that not all genes are organized into discrete regulatory domains.

Original publication

DOI

10.1073/pnas.201413098

Type

Journal article

Journal

Proc Natl Acad Sci U S A

Publication Date

09/10/2001

Volume

98

Pages

12114 - 12119

Keywords

Acetylation, Animals, Binding Sites, Cell Line, Transformed, Chickens, Chromosomes, Human, Pair 16, Conserved Sequence, Erythrocytes, Globins, Histones, Humans, K562 Cells, Mice, Multigene Family, Synteny, Tumor Cells, Cultured