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Nucleic Acids Research, 1990, Vol. 18, No. 13 3745-3752
© 1990

MOLECULAR BIOLOGY

Detection of latent sequence periodicities

Elisabetta Pizzi, Sabino Liuni1 and Clara Frontali*

Laboratorio di Biologia Cellulare, Istituto Superiore di Sanità Rome 1Centro Studi Mitocondri e Metabolismo Energetico, University of Bari Italy

*To whom correspondence should be addressed

Received April 16, 1990. Accepted June 8, 1990.

A method is proposed for the automatic detection of serial periodicities in a linear sequence. Its application to DNA subtelomeric sequences from two lower eukaryotes, P.falciparum and S.cerevisiae, reveals ordered patterns organised in hierarchical periodicities, not easily recognizable by other methods. The possible implications concerning the evolution of tandemly repetitive arrays are discussed in light of a model which involves, as successive steps, random repeat modification, the fusion of differently modified repeat versions into longer units, and the amplification of (and/or homogenization to) the more recent repeat units.


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