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Molecular Aspects of Intron Evolution in Dynein Encoding Mega-Genes on The Heterochromatic Y Chromosome of Drosophila sp.

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Abstract

Fertility genes on the heterochromatic Y chromosome of various Drosophilaspecies are unique for several reasons. Most of them are megabase-sized. Their expression is restricted to premeiotic spermatocytes and often associated with unfolding of huge species-specific lampbrush loops. Molecular analysis of the orthologous dynein genes Dhc-Yh3, DhDhc7(Y)and DeDhc7(Y)on the Y chromosome of the three species D. melanogaster, D. hydeiand D. eohydei, respectively, revealed that the megabase gene size as well as the species-specific morphology of the corresponding lampbrush loops kl-5, Threadsand diffuse loopsresult from huge introns and their specific sequence composition, whereas the majority of all 20 introns in each of the three genes is in a size of 45–72 bp. The loop-specifying introns are extreme exceptions due to extended assemblies of degenerated transposable elements and/or large clusters of satellite DNAs. Here we use sequence information from the complete intron sets of three orthologous Y chromosomal dynein genes to deduce a scenario for an evolutionary pathway leading to the megabase-sized genes on the heterochromatic Y chromosome of Drosophila. The obvious bias between very small and species-specific mega introns is explained as the result of an autocatalytic mode of intron growth. An initial coincidental hit by a single transposable element extends the size of a 50 bp intron for about two orders of magnitude and determines it for preferential extension by similar insertion events. This phase of continuous moderate growth is followed by rapid size enlargements by repeating amplifications generating extended clusters of satellite DNA. Size control by recombination, on the other hand, is suppressed in Drosophilamales by achiasmatic meiosis.

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Authors and Affiliations

  1. Institut für Genetik, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, D-40225, Dü, sseldorf, Germany

    Roman Kurek & Ulrich Lammermann

  2. Institut für Entwicklungsbiologie, Universität zu Köln, Gyrhofstr. 17, D-50931, Köln, Germany

    Alexander M. Reugels

  3. Institut für Genetik, Heinrich-Heine-Universität Düsseldorf, Universitätsstr. 1, D-40225, Düsseldorf, Germany

    Hans Bünemann

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  1. Roman Kurek
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Kurek, R., Reugels, A.M., Lammermann, U. et al. Molecular Aspects of Intron Evolution in Dynein Encoding Mega-Genes on The Heterochromatic Y Chromosome of Drosophila sp.. Genetica 109, 113–123 (2000). https://doi.org/10.1023/A:1026552604229

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