A ubiquitous family of repeated DNA sequences in the human genome

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Abstract

Renatured DNA from human and many other eukaryotes is known to contain 300-nucleotide duplex regions formed from renatured repeated sequences. These short repeated DNA sequences are widely believed to be interspersed with single copy DNA sequences. In this work we show that at least half of these 300-nucleotide duplexes share a cleavage site for the restriction enzyme AluI. This site is located 170 nucleotides from one end. This Alu family of repeated sequences makes up at least 3% of the genome and is present in several hundred thousand copies.

Inverted repeated sequences are also known to contain a short 300-nucleotide duplex region. We find that at least half of the 300-nucleotide duplex regions in inverted repeated sequences also have an AluI restriction site located 170 nucleotides from one end.

By driven renaturation techniques, the Alu family is shown to be distributed over a minimum range of 30% to 60% of the genome. (The breadth of this range reflects the presence of inverted repeated sequences which, in part, include the Alu family.) These findings imply that the interspersion pattern of repeated and single copy sequences in human DNA is largely dominated by one family of repeated sequences.

References (33)

  • T.I. Bonner et al.

    J. Mol. Biol

    (1973)
  • M.E. Chamberlin et al.

    J. Mol. Biol

    (1975)
  • E.H. Davidson et al.

    J. Mol. Biol

    (1973)
  • E.H. Davidson et al.

    Develop. Biol

    (1977)
  • P.L. Deininger et al.

    J. Mol. Biol

    (1976)
  • P.L. Deininger et al.

    J. Mol. Biol

    (1979)
  • N. Fedoroff et al.

    Cell

    (1977)
  • S. Greer et al.

    J. Mol. Biol

    (1962)
  • C.M. Houck et al.

    Biochim. Biophys. Acta

    (1978)
  • W. Jelinek

    J. Mol. Biol

    (1977)
  • W. Jelinek et al.

    J. Mol. Biol

    (1974)
  • J.J. Maio et al.

    J. Mol. Biol

    (1977)
  • M.W. McDonell et al.

    J. Mol. Biol

    (1977)
  • R.J. Roberts et al.

    J. Mol. Biol

    (1976)
  • H.D. Robertson et al.

    J. Mol. Biol

    (1977)
  • C.W. Schmid et al.

    Cell

    (1975)
  • Cited by (0)

    This work was supported by grant GM 21346 from the National Institutes of Health and by a graduate research award from the University of California, Davis.

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