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- W2018900997 abstract "The chapter discusses the status and the activity of genes of moderate level of reiteration in echinoid development. The chromosomes of echinoids are small, numerous, and cytologically undistinguished. The chapter describes the organization and transcription of the echinoid genome. A small, relatively constant, set of units is transcribed during cleavage, producing increasing numbers of simple and constant sets of multiple-copy transcripts and their regulated messages. The renewed synthesis of egg RNA after fertilization and continuation after cleavage could occur, if the sets of acceptor sites transcribed during oogenesis remained unblocked in the unfertilized eggs— that is, if RNA synthesis in the unfertilized egg were regulated by blockage at or immediately adjacent to the promoter sites. Then, the removal of the latter block would restart the transcriptional program characteristic of oogenesis. Cell-specific transcription, as in the micromeres, and stage-specific transcription initiated at hatching are the consequence of unblocking of additional acceptor sites and/or by activation of new promoter sites. If different sets of genes shared common promoter sites, a mechanism for the coordinated initiation of a number of sets of functionally related genes would exist. Transcriptional units with longer acceptor zones may undergo more mutational and recombinational events leading to greater base sequence diversification, whereas those with shorter acceptor zones may have retained sites with less divergence. The transcriptional units account for the appearance of the changing populations of multiple copy transcripts in heterogeneous nuclear RNA; the transcriptional units for tandem repeat elements would lead to the appearance of reiterated DXA transcripts in the cytoplasm." @default.
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- W2018900997 date "1969-04-01" @default.
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- W2018900997 title "Transcription of nuclear and cytoplasmic genes during early development of sea urchin embryos" @default.
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- W2018900997 doi "https://doi.org/10.1016/0022-2836(69)90133-8" @default.
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