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Fig. 1. Time course of maternal transcript degradation in activated, unfertilized eggs. (A) The same Northern blot probed for rpA1 (stable) and string, Hsp83, or nanos (unstable) transcripts. (B) Quantitative analysis of the time course of Hsp83 transcript degradation. 5 h) concentration. 5 h after egg activation. Data from two independent experiments are presented. Half-hour time windows are shown. See ref. 9 for details. Spatial Control of Maternal RNA Stability in Drosophila Although unstable maternal transcripts such as string and Hsp70 are eliminated throughout the egg or early embryo (Fig.

Our hypothesis is that mRNP complexes contain mRNAs that encode proteins that work together in a biological process or form a biological structure such as a ribosome or a spliceosome. In many cases, the encoded products may appear to be of diverse function, perhaps because they regulate complex biological outcomes. In some cases, these diverse gene products may be required for biological remodeling during growth and differentiation. For example, the ELAV/Hu proteins are associated with mRNAs that encode early response gene products (often transcription factors), signaling proteins that can activate downstream pathways, cytoskeletal proteins, and glucose transporters that can mobilize cellular energetics.

Half-hour time windows are shown. See ref. 9 for details. Spatial Control of Maternal RNA Stability in Drosophila Although unstable maternal transcripts such as string and Hsp70 are eliminated throughout the egg or early embryo (Fig. 3 A and B), unstable transcripts such as Pgc, Hsp83, and nanos are eliminated from the bulk cytoplasm of the egg or embryo but remain stable at the posterior (Fig. 3 C-F) (9). , Hsp70) or if a cisacting "protection" element is deleted (see below), then the resulting transgenic Hsp83 transcripts are degraded throughout the embryo (see Fig.

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