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Nucleic Acids Research, 1983, Vol. 11, No. 20 6997-7009
© 1983

MOLECULAR BIOLOGY

Satellite DNA from Xenopus laevis: comparative analysis of 745 and 1037 base pair Hind III tandem repeats

Wolfgang Meyerhof, Beatrix Tappeser, Elke Korge and Walter Knöchel

Institut für Molekularbiologie und Biochemie, Freie Universität Berlin Arnimallee 22, D-1000 Berlin 33, FRG

Received July 18, 1983. Accepted August 30, 1983.

Highly repetitive Hind III restriction fragaents of 0.72–0.76 KBP from total Xenopus laevis genoaic DNA are organized in a tandem like arrangement. Cloning of theme fragments in pBR 322 with subaequent remtriction site mapping and nucleotide sequence analysis of some selected clones showed two different types of sequences. 25–30% of material represent the oocyte specific 5 S DNA repeat units, 70–75% are similar to the recently described repeat elements of satellite 1 DNA. Hybridization of a genoaic DNA library to such a 745 BP monomeric repeat unit and investigation of some clones with positive autoradiographic signals revealed structural heterogeneities of repeat elements, in that the 745 BP sequence cross-hybridized with 1037 BP Hind III repeat units. Nucleotide sequence analysis demonstrated that the two types of sequences show a homology of 84.3% and that the 1037 BP sequence additionally contains duplicated elements of the 745 BP sequence as well as apparently unrelated DNA sequences.


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