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Distinct Single-Copy Sequence Sets in Sea Urchin Nuclear RNAs

Susan G. Ernst, Roy J. Britten and Eric H. Davidson
Proceedings of the National Academy of Sciences of the United States of America
Vol. 76, No. 5 (May, 1979), pp. 2209-2212
Stable URL: http://www.jstor.org/stable/69353
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Distinct Single-Copy Sequence Sets in Sea Urchin Nuclear RNAs
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Abstract

The purpose of this study was to determine whether nuclear RNAs (nRNA) of sea urchin embryos and adult tissues contain identical or partially distinct sets of single-copy sequence transcripts. A DNA tracer was prepared consisting mainly of sequences absent from gastrula nRNA; 3.6% of this tracer reacted with adult intestine nRNA but not with gastrula nRNA. The existence of a differentially transcribed DNA fraction was verified by its partial purification and rehybridization to intestine and gastrula nRNAs. About one-third of the genomic single-copy sequence is represented in both nRNAs, or about 2 × 108 nucleotides. The differentially transcribed portion of the single-copy genome identified in this work includes about 3.5 × 107 nucleotides.

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