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DNA sequence organization in the genomes of five marine invertebrates |
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| Authors: | Robert B Goldberg William R Crain Joan V Ruderman Gordon P Moore Thomas R Barnett Ratchford C Higgins Robert A Gelfand Glenn A Galau Roy J Britten Eric H Davidson |
| Institution: | 1. Department of Biology, Wayne State University, 48202, Detroit, Michigan 2. Marine Biological Laboratory, Woods Hole, Massachusetts 3. Division of Biology, California Institute of Technology, 91125, Pasadena, Calif. 4. Department of Biology, Massachusetts Institute of Technology, 02139, Cambridge, Mass. 5. Department of Biology, Syracuse University, 13210, Syracuse, N. Y. 6. Department of Biology, Yale University, 06520, New Haven, Conn. 7. Department of Biochemistry and Biophysics, University of California, 95616, Davis, Calif., USA |
| Abstract: | The arrangement of repetitive and non-repetitive sequence was studied in the genomic DNA of the oyster (Crassostrea virginica), the surf clam (Spisula solidissima), the horseshoe crab (Limulus polyphemus), a nemertean worm (Cerebratulus lacteus) and a jelly-fish (Aurelia aurita). Except for the jellyfish these animals belong to the protostomial branch of animal evolution, for which little information regarding DNA sequence organization has previously been available. The reassociation kinetics of short (250-300 nucleotide) and long (2,000-3,000 nucleotide) DNA fragments was studied by the hydroxyapatite method. It was shown that in each case a major fraction of the DNA consists of single copy sequences less than about 3,000 nucleotides in length, interspersed with short repetitive sequences. The lengths of the repetitive sequences were estimated by optical hyperchromicity and S1 nuclease measurements made on renaturation products. All the genomes studied include a prominent fraction of interspersed repetitive sequences about 300 nucleotides in length, as well as longer repetitive sequence regions. |
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