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Expression data from BCL11A-null and wild-type bone marrow erythroid pregenitors

ABSTRACT: BCL11A is a critical mediator of hemoglobin switching and gamma-globin silencing. In this study, we showed the BCL11A is required in vivo for developmental silencing of gamma-globin genes in adult animals. We used microarray to determine the changes in gene expression profile after loss of BCL11A in adult erythroid cells CD71+Ter119+ erythroid progenitor cells were FACS-sorted from bone marrows of 6-week old control (Bcl11a +/+) and BCL11A knockout (Bcl11a fl/fl EpoR-Cre+) mice.

ORGANISM(S): Mus musculus

SUBMITTER: Jian Xu

PROVIDER: E-GEOD-28333 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Correction of sickle cell disease in adult mice by interference with fetal hemoglobin silencing.

Xu Jian J Peng Cong C Sankaran Vijay G VG Shao Zhen Z Esrick Erica B EB Chong Bryan G BG Ippolito Gregory C GC Fujiwara Yuko Y Ebert Benjamin L BL Tucker Philip W PW Orkin Stuart H SH

Science (New York, N.Y.) 20111013 6058

Persistence of human fetal hemoglobin (HbF, α(2)γ(2)) in adults lessens the severity of sickle cell disease (SCD) and the β-thalassemias. Here, we show that the repressor BCL11A is required in vivo for silencing of γ-globin expression in adult animals, yet dispensable for red cell production. BCL11A serves as a barrier to HbF reactivation by known HbF inducing agents. In a proof-of-principle test of BCL11A as a potential therapeutic target, we demonstrate that inactivation of BCL11A in SCD trans ...[more]

PMID: 21998251

Similar Datasets

Expression data from BCL11A-null and wild-type bone marrow erythroid pregenitors

Project description:BCL11A is a critical mediator of hemoglobin switching and gamma-globin silencing. In this study, we showed the BCL11A is required in vivo for developmental silencing of gamma-globin genes in adult animals. We used microarray to determine the changes in gene expression profile after loss of BCL11A in adult erythroid cells

2012-03-22 | GSE28333 | GEO

Direct Promoter Repression by BCL11A Controls the Fetal to Adult Hemoglobin Switch

Project description:Fetal hemoglobin (HbF) level is genetically controlled and modifies severity of adult hemoglobin (HbA) disorders. Common genetic variation affects expression of BCL11A, a critical regulator of HbF silencing. Current models suggest that BCL11A acts at a distance from the gamma-globin genes via long-distance chromosomal interactions. Here we use a functional cellular assay and protein-binding microarray to establish a requirement for a zinc-finger cluster of BCL11A for globin repression, and identify a preferred DNA recognition sequence (TGACCA). The motif is present in embryonic and fetal-expressed globin promoters, and duplicated in gamma-globin promoters, yet only the distal motif is mutated in alleles of individuals with hereditary persistence of hemoglobin. Using CUT&RUN to map protein binding sites, we detected BCL11A occupancy preferentially at the distal motif, and validated its absence in HbF-expressing, promoter-edited erythroid cells. Taken together, our findings reveal that direct gamma-globin gene promoter repression by BCL11A underlies hemoglobin switching.

2018-03-30 | GSE104676 | GEO

HRI activates ATF4 to promote BCL11A transcription and fetal hemoglobin silencing [Capture-C]

Project description:Through a CRISPR-Cas9 guided loss-of-function screen in human erythroid cells we identified transcription factor ATF4, a known HRI-regulated protein, as a novel γ-globin repressor. ATF4 binds to a BCL11A enhancer to augment promoter contacts, stimulates BCL11A transcription to repress γ-globin expression. Notably, mice deficient for HRI displayed normal Bcl11a levels, suggesting species selective regulation that we explain here by demonstrating that the analogous ATF4 motif at the murine Bcl11a enhancer is largely dispensable. This illustrates potential limits of commonly used murine models of globin gene regulation.

2020-04-17 | GSE143962 | GEO

HRI activates ATF4 to promote BCL11A transcription and fetal hemoglobin silencing [ChIP-seq]

2020-04-17 | GSE143961 | GEO

HIC2 represses BCL11A transcription to regulate hemoglobin switching during development (RNA-Seq)

Project description:The switch from fetal to adult hemoglobin production has been studied in great depth in part because of its relevance to the treatment of hemolobinopathies. Transcription factor BCL11A, which is essential for repression of the fetal beta-type globin (γ-globin) genes after birth, is largely controlled at the level of transcription but the mechanism of BCL11A developmental control is unknown. Here, using a CRISPR-Cas9 screen in human erythroblasts, we identify transcription factor HIC2 as a repressor of BCL11A transcription. HIC2 and BCL11A expression are anti-correlated in fetal and adult erythroblasts. Forced expression of HIC2 in adult erythroblasts silences BCL11A transcription and markedly induces γ-globin expression. HIC2 binds selectively to constituent erythroid developmental BCL11A enhancer to reduce chromatin accessibility and impair access by transcription factor GATA1, resulting in loss of enhancer activity and enhancer-promoter contacts. Conversely, loss of HIC2 in fetal erythroblasts increases enhancer accessibility, enables GATA1 binding and induces BCL11A transcription. HIC2 is unveiled as a critical evolutionarily conserved regulator of globin gene switching by imposing developmental control on the BCL11A gene.

2022-05-26 | GSE173586 | GEO

HIC2 represses BCL11A transcription to regulate hemoglobin switching during development (ChIP-Seq)

2022-05-26 | GSE173584 | GEO

HIC2 represses BCL11A transcription to regulate hemoglobin switching during development [CUT&RUN]

2022-05-26 | GSE182530 | GEO

HIC2 represses BCL11A transcription to regulate hemoglobin switching during development (Capture-C)

2022-05-26 | GSE173583 | GEO

HIC2 represses BCL11A transcription to regulate hemoglobin switching during development (ATAC-Seq)

2022-05-26 | GSE173582 | GEO

The LRF/ZBTB7A transcription factor is a BCL11A-independent repressor of fetal hemoglobin

Project description:Hemoglobinopathies, including sickle cell disease and _-thalassemia, are global public health concerns. Induction of fetal-type hemoglobin (HbF) is a promising means to treat these disorders; however, precisely how HbF expression is silenced in adult erythroid cells is not fully understood. Here, we show that the LRF/ZBTB7A transcription factor is a potent repressor of HbF production. LRF inactivation derepresses embryonic/fetal _-globin expression in mouse and human adult erythroid cells. We employed genome-wide analysis of the transcriptome, chromatin accessibility and LRF occupancy sites, and demonstrate that LRF occupies the _-globin loci and maintains nucleosome density necessary for _-globin silencing. LRF confers its repressive activity through a unique NuRD repressor complex independent of BCL11A. Strikingly, human erythroid lines lacking both LRF and BCL11A exhibited almost a complete switch in expression from adult- to fetal-type globin, suggesting that these two factors cumulatively represent the near entirety of _-globin repressive activity in adult erythroid cells. RNA-seq, LRF ChIP-seq and ATAC-seq assays were used to investigtae LRF binding, effect of LRF depletion on transcription and chromatin landscape in mouse and human cells.

2016-01-15 | E-GEOD-74977 | biostudies-arrayexpress

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