Hematopoietic stem cells and lymphoid progenitors express different Ikaros isoforms, and Ikaros is localized to heterochromatin in immature lymphocytes

Christopher A. Klug, Sean J. Morrison, Marilyn Masek, Kyungmin Hahm, Stephen T. Smale, Irving L. Weissman

Research output: Contribution to journalArticle

130 Citations (Scopus)

Abstract

The generation of lymphoid cells in mice depends on the function of the Ikaros protein. Ikaros has been characterized as a lymphoid-restricted, zinc- finger transcription factor that is derived from an alternatively spliced message. Ikaros knockout mice have defects in multiple cell lineages, raising the question of whether the protein regulates multiple committed progenitors and/or multipotent stern cells. To address this issue, we examined Ikaros expression in purified populations of multipotent cells and more committed progenitors. We found that the DNA-binding isoforms of Ikaros were localized in the nucleus of the most primitive hematopoietic stem cell subset. Changes in the RNA splicing pattern of Ikaros occurred at two stages: (i) as long- term self-renewing stem cells differentiated into short-term self-renewing stem cells and (ii) as non-self-renewing multipotent progenitors differentiated into lymphoid-committed progenitors. Unexpectedly, we found Ikaros localized to heterochromatin in Abelson-transformed pre-B lymphocytes by using immunogold electron microscopy. These observations suggest a complex role for Ikaros in lymphoid development.

Original languageEnglish (US)
Pages (from-to)657-662
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume95
Issue number2
DOIs
StatePublished - Jan 20 1998

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Heterochromatin
Hematopoietic Stem Cells
Ikaros Transcription Factor
Protein Isoforms
Stem Cells
Lymphocytes
RNA Splicing
B-Lymphoid Precursor Cells
Zinc Fingers
Cell Lineage
Knockout Mice
Electron Microscopy
Transcription Factors
DNA
Population
Proteins

ASJC Scopus subject areas

  • Genetics
  • General

Cite this

Hematopoietic stem cells and lymphoid progenitors express different Ikaros isoforms, and Ikaros is localized to heterochromatin in immature lymphocytes. / Klug, Christopher A.; Morrison, Sean J.; Masek, Marilyn; Hahm, Kyungmin; Smale, Stephen T.; Weissman, Irving L.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 95, No. 2, 20.01.1998, p. 657-662.

Research output: Contribution to journalArticle

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abstract = "The generation of lymphoid cells in mice depends on the function of the Ikaros protein. Ikaros has been characterized as a lymphoid-restricted, zinc- finger transcription factor that is derived from an alternatively spliced message. Ikaros knockout mice have defects in multiple cell lineages, raising the question of whether the protein regulates multiple committed progenitors and/or multipotent stern cells. To address this issue, we examined Ikaros expression in purified populations of multipotent cells and more committed progenitors. We found that the DNA-binding isoforms of Ikaros were localized in the nucleus of the most primitive hematopoietic stem cell subset. Changes in the RNA splicing pattern of Ikaros occurred at two stages: (i) as long- term self-renewing stem cells differentiated into short-term self-renewing stem cells and (ii) as non-self-renewing multipotent progenitors differentiated into lymphoid-committed progenitors. Unexpectedly, we found Ikaros localized to heterochromatin in Abelson-transformed pre-B lymphocytes by using immunogold electron microscopy. These observations suggest a complex role for Ikaros in lymphoid development.",
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AU - Morrison, Sean J.

AU - Masek, Marilyn

AU - Hahm, Kyungmin

AU - Smale, Stephen T.

AU - Weissman, Irving L.

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