Comparative analysis of patterns of mobile genetic element 412 was conducted in 18 isogenic lines of Drosophila melanogaster isolated in three isogenic experiments in 1987 through 1999. Twelve “extra-hot” isogenization sites (in 15–18 lines) and 23 “hot” isogenization sites (≥10 lines) were found; of these, 19 occurred in the original heterogeneous line. These sites virtually do not overlap with hot induction sites of transposition. Sites of the latter group generally retain their positions during isogenization. It was shown that no more than 20% of the new sites were brought from the balancer by double recombination, while inbreeding and outbreeding caused 80% of them. Different factors were shown to have different hot isogenization sites. A similarity tree was constructed for the patterns of 18 isogenic lines. The maximum peak of the tree was very low (< 0.25), i.e., the isogenic lines are more similar to than different from one another. The tree was subdivided into subtrees. The division was in good agreement with the isogenization groups corresponding to individual isogenization experiments. Significant correlation was found between the total fragment length and the number of new sites per lines.
Russian Journal of Genetics – Springer Journals
Published: Oct 7, 2004
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