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Cloned repetitive sequences from the S. purpuratus genome a few hundred to approximately 1000 nucleotides long were used to investigate the characteristics of individual repetitive sequence families. They wer terminally labeled by the kinase procedure and reacted with sheared S. purpuratus DNA. Repetition frequencies were measured for 26 individual families and were found to vary from a few to several thousand copies per genome. Estimates of sequence divergence were made for 18 cloned repeat families by measuring thermal stability of the heteroduplexes formed between the genomic DNA and the cloned fragments, compared with that of the renatured cloned fragments. The difference was less than 4 degrees C for three of the 18 families, and less than 10 degress C for 13 of the 18 families. These 13 repetitive sequence families lack any detectable highly divergent sequence relatives, and the results reported are shown not to change when the renaturation criterion is lowered below 55 degrees C in 0.18 M Na+. Five of the 18 cloned families displayed greater sequence divergence. The average sequence divergence of the total short repetitive sequence fraction of S. purpuratus DNA was found to match closely the average of the divergences of the cloned repeat sequences.
W H Klein, and
T L Thomas, and
C Lai, and
R H Scheller, and
R J Britten, and
E H Davidson
April 1977,
Science (New York, N.Y.),
W H Klein, and
T L Thomas, and
C Lai, and
R H Scheller, and
R J Britten, and
E H Davidson
January 1978,
Cold Spring Harbor symposia on quantitative biology,
W H Klein, and
T L Thomas, and
C Lai, and
R H Scheller, and
R J Britten, and
E H Davidson
January 1981,
Journal of molecular biology,
W H Klein, and
T L Thomas, and
C Lai, and
R H Scheller, and
R J Britten, and
E H Davidson
June 1981,
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W H Klein, and
T L Thomas, and
C Lai, and
R H Scheller, and
R J Britten, and
E H Davidson
January 1977,
Nucleic acids research,
W H Klein, and
T L Thomas, and
C Lai, and
R H Scheller, and
R J Britten, and
E H Davidson
September 1978,
Cell,
W H Klein, and
T L Thomas, and
C Lai, and
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E H Davidson
September 1978,
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W H Klein, and
T L Thomas, and
C Lai, and
R H Scheller, and
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E H Davidson
May 1974,
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W H Klein, and
T L Thomas, and
C Lai, and
R H Scheller, and
R J Britten, and
E H Davidson
May 1980,
Science (New York, N.Y.),
W H Klein, and
T L Thomas, and
C Lai, and
R H Scheller, and
R J Britten, and
E H Davidson
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