Chromatin condensation in terminally differentiating mouse erythroblasts does not involve special architectural proteins but depends on histone deacetylation
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Abstract
Terminal erythroid differentiation in vertebrates is characterized by progressive heterochromatin formation and chromatin condensation and, in mammals, culminates in nuclear extrusion. To date, although mechanisms regulating avian erythroid chromatin condensation have been identified, little is known regarding this process during mammalian erythropoiesis. To elucidate the molecular basis for mammalian erythroblast chromatin condensation, we used Friend virus-infected murine spleen erythroblasts that undergo terminal differentiation in vitro. Chromatin isolated from early and late-stage erythroblasts had similar levels of linker and core histones, only a slight difference in nucleosome repeats, and no significant accumulation of known developmentally regulated architectural chromatin proteins. However, histone H3(K9) dimethylation markedly increased while histone H4(K12) acetylation dramatically decreased and became segregated from the histone methylation as chromatin condensed. One histone deacetylase, HDAC5, was significantly upregulated during the terminal stages of Friend virus-infected erythroblast differentiation. Treatment with histone deacetylase inhibitor, trichostatin A, blocked both chromatin condensation and nuclear extrusion. Based on our data, we propose a model for a unique mechanism in which extensive histone deacetylation at pericentromeric heterochromatin mediates heterochromatin condensation in vertebrate erythroblasts that would otherwise be mediated by developmentally-regulated architectural proteins in nucleated blood cells.
Key words
erythroblast enucleation chromatin condensation heterochromatin histone deacetylationAbbreviations
- FVA cells
Friend virus-infected murine spleen erythroblasts
- H3acK9,K14
histone H3 acetylated at lysines 9 and 14
- H3me2K9
histone H3 dimethylated at lysine 9
- H3me3K9
histone H3 trimethylated at lysine 9
- H4acK12
histone H4 acetylated at lysine 12
- HDAC
histone deacetylase
- HP1
heterochromatin protein 1
- HPLC
high-performance liquid chromatography
- KCM buffer
120 mM KCl, 20 mM NaCl, 10 mM Tris-HCl, pH 7.7, 0.1% Triton X-100
- MEL
mouse erythroleukemia cells
- PBS
phosphate-buffered saline
- RSB
reticulocyte standard buffer (10 mM NaCl, 3 mM MgCl2, 10 mM Hepes, pH 7.5)
- SDS-PAGE
sodium dodecyl sulfate–polyacrylamide gel electrophoresis
- TSA
trichostatin A
Notes
Acknowledgments
We are grateful to Drs. P. Singh (Borstel, Germany), D. Tremethick (Canberra, Australia), and N. Chaudhary (Woodlands, TX, USA) for their kind gifts of antibodies against HP1, H2A.Z, and lamins A/C and B. Supported in part by National Institutes of Health Grants DK32094, DK56267, DK59079, and CA084214; National Science Foundation grant MCB-0615536, and by the Director, Office of Health and Environment Research Division, US Department of Energy, under Contract DE-AC03-76SF00098; and by Merit Review Award from the Department of Veteran Affairs.
Supplementary material
References
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