The Relative Contributions of Newly Synthesized and Stored Messages to Hl Histone Synthesis in Interspecies Hybrid Echinoid Embryos |
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Authors: | DOUGLAS P EASTON ARTHUR H WHITELEY |
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Institution: | Department of Zoology and The Friday Harbor Laboratories, University of Washington, Seattle, Washington 98195, USA |
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Abstract: | We have measured the ratio of incoropation of 3H-lysine into the maternal and paternal forms of Hl histones synthesized by the interordinal hybrid embryo which results from the fertilization of sand dollar eggs with sea urchin sperm. This ratio has been used to calculate the relative contributions of newly transcribed and stored Hl histone mRNA to the synthesis of Hl histone at five different stages of development. These calculations are based on the assumption that histone mRNA of both parental types is transcribed with equal efficiency from the genome and that these RNAs are translated with equal efficiency in the cytoplasm of the hybrid embryos. On this basis, we have estimated that the contribution of new mRNA respresents 80% of total Hl histone synthesis at the 16–32 cell stage, 54% at the hatching blastula stage, 40% at the mesenchyme blastula stage, and 100% after gastrulation. These data are discussed in the light of presently known parameters of histone and histone mRNA synthesis in echinoderm embryos. |
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