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. 1986 Apr;6(4):1108–1116. doi: 10.1128/mcb.6.4.1108

Chromatin structure and developmental expression of the human alpha-globin cluster.

M Yagi, R Gelinas, J T Elder, M Peretz, T Papayannopoulou, G Stamatoyannopoulos, M Groudine
PMCID: PMC367621  PMID: 3785159

Abstract

The human alpha-like globins undergo a switch from the embryonic zeta-chain to the alpha-chain early in human development, at approximately the same time as the beta-like globins switch from the embryonic epsilon-to the fetal gamma-chains. We investigated the chromatin structure of the human alpha-globin gene cluster in fetal and adult erythroid cells. Our results indicate that DNase I-hypersensitive sites exist at the 5' ends of the alpha 1- and alpha 2-globin genes as well as at several other sites in the cluster in all erythroid cells examined. In addition, early and late fetal liver erythroid cells and adult bone marrow cells contain hypersensitive sites at the 5' end of the zeta gene, and in a purified population of 130-day-old fetal erythroid cells, the entire zeta-to alpha-globin region is sensitive to DNase I digestion. The presence of features of active chromatin in the zeta-globin region in fetal liver and adult bone marrow cells led us to investigate the transcription of zeta in these cells. By nuclear runoff transcription studies, we showed that initiated polymerases are present on the zeta-globin gene in these normal erythroid cells. Immunofluorescence with anti-zeta-globin antibodies also showed that late fetal liver cells contain zeta-globin. These findings demonstrate that expression of the embryonic zeta-globin continues at a low level in normal cells beyond the embryonic to fetal globin switch.

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