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Nucleic Acids Research, 1982, Vol. 10, No. 11 3495-3501
© 1982

MOLECULAR BIOLOGY

Chromatin diminution in Ascaris suum: nucleotide sequence of the eliminated satellite DNA

R.E. Streeck*,{dagger}, K.B. Moritz+ and K. Beer*

*Institut für Physiologische Chemie, Physikalische Biochemie und Zellbiologie der Universität München, Goethestr. 33 +Zoologisches Institut der Universität München Luisenstr. 14, D-8000 Mänchen 2, FRG

{dagger}Present address: Institut Pasteur, 28 rue du Docteur Roux, 75724 Paris Cedex 15, France

Received April 19, 1982. Accepted May 13, 1982.

We have determined the prototype sequence of the DNA which is eliminated in the course of chromatin diminution in Ascaris suum This DNA which is virtually absent from somatic cells but retained in the germ line consists predominantly of highly repetitive sequences which are variants of an AT rich 123 base pair repeat unit. Both major and minor variants have been sequenced. The overall structure of this germ line limited DNA corresponds to the segmental organization characteristic of satellite DNAs. Possible correlations between the mechanism of chromatin diminution and some properties of the satellite sequence are discussed.


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