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Superenhancer reprogramming drives a B-cell-epithelial transition and high-risk leukemia
Harvard Medical Sch, MA 02129 USA.
Harvard Medical Sch, MA 02129 USA.
Harvard Medical Sch, MA 02129 USA.
Harvard Medical Sch, MA 02129 USA.
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2016 (English)In: Genes & Development, ISSN 0890-9369, E-ISSN 1549-5477, Vol. 30, no 17, 1971-1990 p.Article in journal (Refereed) Published
Abstract [en]

IKAROS is required for the differentiation of highly proliferative pre-B-cell precursors, and loss of IKAROS function indicates poor prognosis in precursor B-cell acute lymphoblastic leukemia (B-ALL). Here we show that IKAROS regulates this developmental stage by positive and negative regulation of superenhancers with distinct lineage affiliations. IKAROS defines superenhancers at pre-B-cell differentiation genes together with B-cell master regulators such as PAX5, EBF1, and IRF4 but is required for a highly permissive chromatin environment, a function that cannot be compensated for by the other transcription factors. IKAROS is also highly enriched at inactive enhancers of genes normally expressed in stem-epithelial cells. Upon IKAROS loss, expression of pre-B-cell differentiation genes is attenuated, while a group of extralineage transcription factors that are directly repressed by IKAROS and depend on EBF1 relocalization at their enhancers for expression is induced. LHX2, LMO2, and TEAD-YAP1, normally kept separate from native B-cell transcription regulators by IKAROS, now cooperate directly with them in a de novo superenhancer network with its own feed-forward transcriptional reinforcement. Induction of de novo superenhancers antagonizes Polycomb repression and superimposes aberrant stem epithelial cell properties in a B-cell precursor. This dual mechanism of IKAROS regulation promotes differentiation while safeguarding against a hybrid stem epithelial B-cell phenotype that underlies high-risk B-ALL.

Place, publisher, year, edition, pages
COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT , 2016. Vol. 30, no 17, 1971-1990 p.
Keyword [en]
TEAD; YAP1; LHX2; PRC2; self-renewal
National Category
Developmental Biology
Identifiers
URN: urn:nbn:se:liu:diva-132482DOI: 10.1101/gad.283762.116ISI: 000384964600008PubMedID: 27664237OAI: oai:DiVA.org:liu-132482DiVA: diva2:1046264
Note

Funding Agencies|National Institutes of Health [R01CA162092, R21AI124326, R01CA090576, R01CA190964]

Available from: 2016-11-13 Created: 2016-11-12 Last updated: 2016-12-02

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Somasundaram, RajeshSigvardsson, Mikael
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Division of Microbiology and Molecular MedicineFaculty of Medicine and Health Sciences
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