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Popkova, A., Bernardoni, R., Diebold, C., Van de Bor, V., Schuettengruber, B., Gonz├ílez, I., Busturia, A., Cavalli, G., Giangrande, A. (2012). Polycomb controls gliogenesis by regulating the transient expression of the gcm/glide fate determinant.  PLoS Genet. 8(12): e1003159.
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Research paper

The Gcm/Glide transcription factor is transiently expressed and required in the Drosophila nervous system. Threshold Gcm/Glide levels control the glial versus neuronal fate choice, and its perdurance triggers excessive gliogenesis, showing that its tight and dynamic regulation ensures the proper balance between neurons and glia. Here, we present a genetic screen for potential gcm/glide interactors and identify genes encoding chromatin factors of the Trithorax and of the Polycomb groups. These proteins maintain the heritable epigenetic state, among others, of HOX genes throughout development, but their regulatory role on transiently expressed genes remains elusive. Here we show that Polycomb negatively affects Gcm/Glide autoregulation, a positive feedback loop that allows timely accumulation of Gcm/Glide threshold levels. Such temporal fine-tuning of gene expression tightly controls gliogenesis. This work performed at the levels of individual cells reveals an undescribed mode of Polycomb action in the modulation of transiently expressed fate determinants and hence in the acquisition of specific cell identity in the nervous system.

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PMC3531469 (PMC) (EuropePMC)
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    Publication Type
    PLoS Genet.
    PLoS Genetics
    Publication Year
    1553-7404 1553-7390
    Data From Reference
    Aberrations (59)
    Alleles (41)
    Genes (37)
    Natural transposons (1)
    Insertions (1)
    Transgenic Constructs (5)