Adjacent repeating units of Xenopus laevis 5S DNA can be heterogeneous in length - PubMed (original) (raw)
Adjacent repeating units of Xenopus laevis 5S DNA can be heterogeneous in length
D Carroll et al. Cell. 1976 Apr.
Abstract
The distribution of length heterogeneity in adjacent repeating units of X. laevis 5S DNA has been examined by "cloning" 5S DNA in bacteria. Fragments of 5S DNA produced by partial digestion with Hind III and containing 1, 4, and 5 repeating units have been inserted at the single Hind III site of the tetracycline-resistance plasmid, pSC101, and the hybrid plasmids cloned in E. coli. Adjacent 5S DNA repeats in the cloned multi-repeat fragments can differ in length. This finding rules out some mechanisms which have been proposed to account for the parallel evolution of tandem repeated DNAs. The results are consistent with an unequal crossing-over mechanism and place some constraints on the molecular processes in this recombinatory event.
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