Dynamic expression of LIM cofactors in the developing mouse neural tube

Authors

  • Heather P. Ostendorff,

    1. Zentrum für Molekulare Neurobiologie Hamburg (ZMNH), Universität Hamburg, Martinistr. 85, 20251 Hamburg, Germany
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    • Heather P. Ostendorff and Baris Tursun contributed equally to this work.

  • Baris Tursun,

    1. Zentrum für Molekulare Neurobiologie Hamburg (ZMNH), Universität Hamburg, Martinistr. 85, 20251 Hamburg, Germany
    2. Program in Gene Function and Expression, University of Massachusetts Medical School, Worcester, Massachusetts
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    • Heather P. Ostendorff and Baris Tursun contributed equally to this work.

  • Kerstin Cornils,

    1. Zentrum für Molekulare Neurobiologie Hamburg (ZMNH), Universität Hamburg, Martinistr. 85, 20251 Hamburg, Germany
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  • Anne Schlüter,

    1. Zentrum für Molekulare Neurobiologie Hamburg (ZMNH), Universität Hamburg, Martinistr. 85, 20251 Hamburg, Germany
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  • Alexander Drung,

    1. Zentrum für Molekulare Neurobiologie Hamburg (ZMNH), Universität Hamburg, Martinistr. 85, 20251 Hamburg, Germany
    2. Program in Gene Function and Expression, University of Massachusetts Medical School, Worcester, Massachusetts
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  • Cenap Güngör,

    1. Zentrum für Molekulare Neurobiologie Hamburg (ZMNH), Universität Hamburg, Martinistr. 85, 20251 Hamburg, Germany
    2. Program in Gene Function and Expression, University of Massachusetts Medical School, Worcester, Massachusetts
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  • Ingolf Bach

    Corresponding author
    1. Zentrum für Molekulare Neurobiologie Hamburg (ZMNH), Universität Hamburg, Martinistr. 85, 20251 Hamburg, Germany
    2. Program in Gene Function and Expression, University of Massachusetts Medical School, Worcester, Massachusetts
    3. Program in Molecular Medicine, University of Massachusetts Medical School, Worcester, Massachusetts
    • Program in Gene Foundation and Expression, University of Massachusetts Medical School, 364 Plantation Street, LRB 513, Worcester, MA 01605-2324
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Abstract

The developmental regulation of LIM homeodomain transcription factors (LIM-HD) by the LIM domain-binding cofactors CLIM/Ldb/NLI and RLIM has been demonstrated. Whereas CLIM cofactors are thought to be required for at least some of the in vivo functions of LIM-HD proteins, the ubiquitin ligase RLIM functions as a negative regulator by its ability to target CLIM cofactors for proteasomal degradation. In this report, we have investigated and compared the protein expression of both factors in the developing mouse neural tube. We co-localize both proteins in many tissues and, although widely expressed, we detect high levels of both cofactors in specific neural tube regions, e.g., in the ventral neural tube, where motor neurons reside. The mostly ubiquitous distribution of RLIM- and CLIM-encoding mRNA differs from the more specific expression of both cofactors at the protein level, indicating post-transcriptional regulation. Furthermore, we show that both cofactors not only co-localize with each other but also with Isl and Lhx3 LIM-HD proteins in developing ventral neural tube neurons. Our results demonstrate the dynamic expression of cofactors participating in the regulation of LIM-HD proteins during the development of the neural tube in mice and suggest additional post-transcriptional regulation in the nuclear LIM-HD protein network. Developmental Dynamics 235:786–791, 2006. © 2006 Wiley-Liss, Inc.

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