Nucleic Acids Research, 1983, Vol. 11, No. 15 5073-5091
© 1983
MOLECULAR BIOLOGY |
Size and structure of the highly repetitive BAM HI element in mice
Department of Pathology, School of Medicine, University of California Davis, CA 95616, USA
Received June 6, 1983. Accepted July 7, 1983.
The BAM HI family of long interspersed DNAs in mice represent as much as 0.5% of the mouse genome. Cloned mouse DNA fragments which contain BAM Hl/non-BAM HI junction sequences have been analyzed by restriction mapping and DNA sequencing. It has been found that BAM HI elements: (i) are approximately 7 kilobase pairs in size, (ii) are not bracketed by long repeated sequences analogous to the terminal repeats of proviruses and (iii) contain a poly-dA track at one end. The data strongly suggest that BAM HI elements arose by a process involving RNA intermediates. The beginning of the element, opposite the poly-dA track, contains a 22 base pair sequence exhibiting 65% homology to a ubiquitous mammalian sequence which may play a role in DNA replication (1). The poly-dA end of the element contains BAM5 and R sequences, both of which have been described previously (2,3).
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