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Nucleic Acids Research, 1977, Vol. 4, No. 12 4425-4438
© 1977

Articles

The evolution of repetitive DNA sequences in sea urchins*,+

Michael M. Harpold{varepsilon} and Sydney P. Craig

Department of Biology, University of South Carolina Columbia, S.C. 292O8 Department of Biology, Tulane University New Orleans, LA 70118, USA

+Reprint requests should be sent to S.P. Craig at the Department of Biology, University of South Carolina, Columbia, South Carolina, 29208, U.S.A.

Received November 14, 1977.

Molecular hybridization of nuclear DNAs has been employed to study the evolution of the repetitive DNA sequences in four species of sea urchin. The data show that relative to S. purpuratus there has been approximately 0.1% sequence divergence per million years in the repetitive DNA sequences of S. droebachiensis, S. franciscanus, and L. pictus. These results confirm that repetitive DNA sequences are strongly conserved during evolution. However, comparison of the extent of base pair mismatch in the repetitive DNA heteroduplexes formed at Cot 20 with those formed at Cot 200 during the hybridization of S. purpuratus and L. pictus DNAs reveals that highly repetitive sequences of sea urchins may diverge more rapidly than do the more moderately repetitive sequences.

*Submitted by M.M. Harpold to the Department of Biology at Tulane University in partial fulfillment of the requirements for the doctor of philosophy degree.

{varepsilon}Present Address: The Rockefeller University, 1230 York Avenue, New York, New York 10021.


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