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Mutations affecting the secretory COPII coat component SEC23B cause congenital dyserythropoietic anemia type II

Nature Genetics volume 41, pages 936–940 (2009)Cite this article

Abstract

Congenital dyserythropoietic anemias (CDAs) are phenotypically and genotypically heterogeneous diseases1,2,3,4. CDA type II (CDAII) is the most frequent CDA. It is characterized by ineffective erythropoiesis and by the presence of bi- and multinucleated erythroblasts in bone marrow, with nuclei of equal size and DNA content, suggesting a cytokinesis disturbance5. Other features of the peripheral red blood cells are protein and lipid dysglycosylation and endoplasmic reticulum double-membrane remnants4,6. Development of other hematopoietic lineages is normal. Individuals with CDAII show progressive splenomegaly, gallstones and iron overload potentially with liver cirrhosis or cardiac failure. Here we show that the gene encoding the secretory COPII component SEC23B is mutated in CDAII. Short hairpin RNA (shRNA)-mediated suppression of SEC23B expression recapitulates the cytokinesis defect. Knockdown of zebrafish sec23b also leads to aberrant erythrocyte development. Our results provide in vivo evidence for SEC23B selectivity in erythroid differentiation and show that SEC23A and SEC23B, although highly related paralogous secretory COPII components, are nonredundant in erythrocyte maturation.

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Figure 1: SEC23B mutation analysis.
Figure 2: SEC23B expression and function in erythroid cells.
Figure 3: Analysis of sec23b zebrafish morphants.

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Acknowledgements

We acknowledge the technical assistance of S. Braun, I. Janz, T. Kersten, G. Baur, T. Becker and R. Leichtle. Anti-ts-O45-G monoclonal antibody 'VG' was a gift from K. Simons (Max Planck Institute of Molecular Cell Biology and Genetics). HeLa-Kyoto cells (human cervix carcinoma cells) were from S. Narumiya (Kyoto University) and T. Hirota (Institute of Molecular Pathology). These studies were supported by the German Red Cross Blood Service Baden-Wuerttemberg-Hessen to K.S., by the University of Ulm to H.H. and by the Else Kröner Fresenius Stiftung to K.S. and H.H. Additional support was provided by the Italian Ministero dell'Università e della Ricerca, by Telethon (Italy), by grants MUR-P35/126/IND and by grants Convenzione CEINGE-Regione Campania-Ass. Sanità to A.I. University of Utah Core facilities were supported by an US National Institutes of Health grant. K.-P.H. acknowledges support from the Deutsche Forschungsgemeinschaft (SFB 684). We thank the DIM Facility for imaging microscopy and the Flow Cytometry Facility for cell cycle analyses at CEINGE Institute.

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Author notes

  1. Klaus Schwarz and Achille Iolascon: These authors contributed equally to this work.

Authors and Affiliations

  1. Institute for Transfusion Medicine, University of Ulm, Ulm, Germany

    Klaus Schwarz, Katja Heinrich, Markus T Rojewski & Ulrich Pannicke

  2. Institute for Clinical Transfusion Medicine and Immunogenetics Ulm, German Red Cross Blood Service Baden-Wuerttemberg-Hessen, Ulm, Germany

    Klaus Schwarz & Markus T Rojewski

  3. Department of Biochemistry and Medical Biotechnologies, University Federico II of Naples and CEINGE Advanced Biotechnologies, Naples, Italy

    Achille Iolascon, Roberta Russo, Maria Rosaria Esposito, Daniela Spano & Luigia De Falco

  4. Cell Biology and Biophysics, European Molecular Biology Laboratory, Heidelberg, Germany

    Fatima Verissimo, Brigitte Joggerst & Rainer Pepperkok

  5. Huntsman Cancer Institute, University of Utah, Salt Lake City, Utah, USA

    Nikolaus S Trede & Wyatt Horsley

  6. Department of Pediatrics, University of Utah, Salt Lake City, Utah, USA

    Nikolaus S Trede & Wyatt Horsley

  7. Department of Medicine, Hematology Division, and Hematology-Oncology Division, Brigham & Women's Hospital, Children's Hospital Boston, Harvard Medical School, Boston, Massachusetts, USA

    Wen Chen & Barry H Paw

  8. Department of Chemistry and Biochemistry, Center for Integrated Protein Science and Gene Center, Ludwig-Maximilians-University Munich, Munich, Germany

    Karl-Peter Hopfner

  9. Chip Facility ZKF, University Hospital Ulm, Ulm, Germany

    Karlheinz Holzmann

  10. Department of Pediatrics, Second University of Naples, Naples, Italy

    Silverio Perrotta

  11. Department of Pediatrics, University of Rostock, Rostock, Germany

    Jonas Denecke

  12. INSERM U 779, Hôpital de Bicêtre, 94275 Le Kremlin-Bicêtre, France

    Jean Delaunay

  13. Department Internal Medicine III, University Hospital Ulm, Ulm, Germany

    Hermann Heimpel

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  1. Klaus Schwarz
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Contributions

K.S., A.I. and H.H. designed the study. H.H., A.I., S.P. and J. Delaunay treated subjects, collected clinical data and, together with J. Denecke, performed clinical laboratory analyses. K. Holzmann performed and K. Holzmann and K.S. analyzed the chip experiments. K.S., F.V., R.R., M.R.E., D.S., L.D.F., K. Heinrich, B.J., U.P. and R.P. performed the molecular, protein and cell analyses. K.-P.H. modeled the SEC23B structure. N.S.T. and W.H. performed zebrafish morpholino injections, blood cell preparations and electron microscopy. W.C. and B.H.P. performed the zebrafish western blot analysis. M.T.R. did the FACS analyses and fibroblast differentiation. K.S., A.I. and H.H. wrote the paper.

Corresponding authors

Correspondence to Klaus Schwarz or Achille Iolascon.

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Schwarz, K., Iolascon, A., Verissimo, F. et al. Mutations affecting the secretory COPII coat component SEC23B cause congenital dyserythropoietic anemia type II. Nat Genet 41, 936–940 (2009). https://doi.org/10.1038/ng.405

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