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  • Title: The temporally regulated transcription factor sel-7 controls developmental timing in C. elegans.
    Author: Xia D, Huang X, Zhang H.
    Journal: Dev Biol; 2009 Aug 15; 332(2):246-57. PubMed ID: 19500563.
    Abstract:
    The temporal sequence of cell division and differentiation is explicitly controlled for succession and synchrony of developmental events. In this study we describe how the Caenorhabditis elegans gene sel-7 specifies the L3 stage-specific fate of seam cells, which adopt temporal specificities at each of four larval stages. Loss of function of sel-7 causes reiteration of the L2 stage fate at the L3 stage. sel-7 is involved in regulating the temporal expression pattern of hbl-1, which is a key factor in specifying the L2/L3 progression. We also show that sel-7 functions redundantly with other retarded heterochronic genes, including lin-46, daf-12 and the let-7 family miRNAs, in preventing adoption of the L2 fate at later stages. Expression of sel-7 in seam cells is temporally regulated through an evolutionarily conserved regulatory element located in intron 4 of sel-7. We further demonstrate that reiteration of the L2 proliferative seam cell division at the L3 stage in sel-7 mutants requires activity of the transcriptional mediator complex. Our study reveals that sel-7 functions as a novel heterochronic gene in controlling temporal cell identities and also demonstrates a role of the transcriptional mediator complex in integrating temporal information to specify seam cell division patterns in C. elegans.
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