Restriction analysis of chromosomal sequences homologous to single-copy fragments cloned from small polydisperse circular DNA (spcDNA) |
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Authors: | Günter Assum Brigitte Böckle Thomas Fink Ursula Dmochewitz Winfrid Krone |
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Institution: | (1) Abteilung Humangenetik der Universität, Postfach 4066, D-7900 Ulm, Federal Republic of Germany |
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Abstract: | Summary Restriction fragments from the fraction of small polydisperse circular DNA (spcDNA) were cloned in pBR322. The spcDNA was prepared from cell cultures derived from an angiofibroma of a patient with tuberous sclerosis (TS). Such cultures have been shown previously to contain increased amounts of spcDNA. Four cloned spcDNA fragments containing single-copy sequences were chosen to characterize the homologous chromosomal DNA segments by restriction analysis. When used as hybridization probes, these four fragments generate well-defined nonvariable patterns in the chromosomal DNA from healthy donors. The restriction patterns obtained with one of the fragments (D-C4) can best be interpreted by assuming the presence of two copies of the homologous sequences in chromosomal DNA. A second sequence, A-B4, occurs at least 30–50 times in the haploid human genome. In both cases the duplicated regions span relatively large segments of DNA. |
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