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LRF acts as an activator and repressor of the human β-like globin gene transcription in a developmental stage dependent manner

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Leukemia/lymphoma-related factor (LRF; a hematopoietic transcription factor) has been suggested to repress fetal γ-globin genes in the human adult stage β-globin locus. Here, to study the role of LRF in the fetal stage β-globin locus, we knocked out its expression in erythroid K562 cells, in which the γ-globin genes are mainly transcribed. The γ-globin transcription was reduced in LRF knock-out cells, and transcription factor binding to the β-globin locus control region hypersensitive sites (LCR HSs) and active histone organization in the LCR HSs were disrupted by the depletion of LRF. In contrast, LRF loss in the adult stage β-globin locus did not affect active chromatin structure in the LCR HSs and induced the fetal γ-globin transcription. These results indicate that LRF may act as an activator and repressor of the human β-like globin gene transcription in a manner dependent on developmental stage.
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Keywords: LRF; activateur; activator; repressor; répresseur; transcription; β-globin; β-globine; γ-globin; γ-globine

Document Type: Research Article

Affiliations: Department of Molecular Biology, College of Natural Sciences, Pusan National University, Busan 46241, Republic of Korea.

Publication date: January 1, 2019

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