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The retrotransposon family micropia in Drosophila species

  • D.-H. Lankenau
Part of the Contemporary Issues in Genetics and Evolution book series (CIGE, volume 1)

Abstract

During the diplotene of the prophase of meiosis, the oocytes of many animal species contain spectacular chromosome structures called lampbrush loops (reviewed e.g. by 4Callan, 1987; 5Davidson, 1986). Their basic function seems to be the synthesis and maintenance of a large pool of pre-zygotic transcripts. In most Drosophila species it is the Y-chromosome that develops lampbrush loops in primary spermatocytes during the prophase of meiosis. The Y chromosome is only needed during spermatogenesis as males lacking the Y chromosome are completely viable but sterile (Bridges, 1916). Except during meiosis, the Y chromosomes remain condensed, a typical feature of heterochromatin. Corresponding to this is its repetitive sequence organization which has caused problems in establishing the true origin of these sequences from the Y chromosomal lampbrush loops (Vogt & 30Hennig, 1983). These difficulties were overcome by the application of the microcloning technique to dissect and then directly clone sequences from less than 0.1 pg of Y chromosomal lampbrush loop DNA (12Hennig et al., 1983; Hennig et al., 1989). In order to succeed with these experiments lampbrush loop structures of primary spermatocytes from Drosophila hydei, known to contain the most distinctive loops among all Drosophila species, were micro-dissected from partial Y chromosomes carrying only one or two lampbrush loops (Hackstein et al., 1982). ‘Microclones’ recovered from the lampbrush loops ‘Threads’ and ‘Pseudonucleolus’ led to the discovery of the micropia retrotransposon family (15Huijser et al., 1988; 20Lankenau et al., 1988>).

Keywords

Transposable Element Drosophila Species Primer Binding Site Primary Spermatocyte Baltic Amber 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1993

Authors and Affiliations

  • D.-H. Lankenau
    • 1
  1. 1.Department of BiologyJohns Hopkins UniversityBaltimoreUSA

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