Cited by 59Hemoglobinopathies and Related DisordersGenomics and Chromatin DynamicsHemoglobin structure and function

Flanking HS-62.5 and 3′ HS1, and regions upstream of the LCR, are not required for β-globin transcription

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Bender, M. A., Byron, Rachel, Ragoczy, Tobias, Telling, Agnes, Bulger, Michael, Groudine, Mark·2006·Blood

Abstract

The locus control region (LCR) was thought to be necessary and sufficient for establishing and maintaining an open beta-globin locus chromatin domain in the repressive environment of the developing erythrocyte. However, deletion of the LCR from the endogenous locus had no significant effect on chromatin structure and did not silence transcription. Thus, the cis-regulatory elements that confer the open domain remain unidentified. The conserved DNaseI hypersensitivity sites (HSs) HS-62.5 and 3'HS1 that flank the locus, and the region upstream of the LCR have been implicated in globin gene regulation. The flanking HSs bind CCCTC binding factor (CTCF) and are thought to interact with the LCR to form a "chromatin hub" involved in beta-globin gene activation. Hispanic thalassemia, a deletion of the LCR and 27 kb upstream, leads to heterochromatinization and silencing of the locus. Thus, the region upstream of the LCR deleted in Hispanic thalassemia (upstream Hispanic region [UHR]) may be required for expression. To determine the importance of the UHR and flanking HSs for beta-globin expression, we generated and analyzed mice with targeted deletions of these elements. We demonstrate deletion of these regions alone, and in combination, do not affect transcription, bringing into question current models for the regulation of the beta-globin locus.

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  1. Ragoczy T, Bender MA, Telling A, Byron R, Grou- dine M. The murine beta-globin LCR positions the globin locus at engaged transcription factories during erythroid maturation. Genes Dev. 2006;20: 1447-1457.

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Authors
Bender, M. A., Byron, R., Ragoczy, T., Telling, A., Bulger, M., & Groudine, M.
Affiliations
University of Washington (US)
Venue
Blood
Published
2006-08-15
Volume
108
Issue
4
Pages
1395-1401
ISSN
  • 0006-4971 (ISSN-L)
  • 1528-0020
OpenAlex
W2084095051
Cited by
59
References
52
Citations by year
2021: 2 · 2019: 2 · 2018: 1 · 2017: 3 · 2016: 2 · 2015: 3 · 2013: 5 · 2012: 7
FWCI
4.20
Type
journal article
Language
en
Open access
Locations
  • Blood (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Burroughs Wellcome Fund
  • Fred Hutchinson Cancer Research Center
  • National Institutes of Health
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 44746)
Topics
  • Health Sciences › Medicine › Genetics › Hemoglobinopathies and Related Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Hemoglobin structure and function
Keywords
locus control region, CTCF, globin gene regulation, cis-regulatory elements, erythroid gene expression
MeSH terms
Animals, Base Sequence, Chromatin, Gene Expression Regulation, Globins, Models, Genetic, Thalassemia, Transcription, Genetic, Transcriptional Activation, Sequence Deletion, Mice, Knockout, Locus Control Region, 5' Flanking Region, Quantitative Trait Loci, Mice

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