A heterochromatic P sequence in the D. subobscura genome

The study of a heterochromatic P sequence of D. subobscura reveals that it is a degraded element, located at the centromeric region of the A chromosome (X chromosome in this species), and that it is strongly diverged from the euchromatic P sequences previously described in this species. This heteroc...

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Bibliographic Details
Published in:Genetica 1994, Vol.92 (3), p.177-186
Main Authors: Paricio, N, Martínez-Sebastián, M J, de Frutos, R
Format: Article
Language:English
Subjects:
Animals
Base Sequence
Chromosome Mapping
Cloning, Molecular
DNA Transposable Elements - genetics
DNA, Complementary
Drosophila - genetics
Drosophila subobscura
Heterochromatin - genetics
Molecular Sequence Data
Phylogeny
Sequence Alignment
Sequence Analysis, DNA
Transcription, Genetic
X Chromosome
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Summary:The study of a heterochromatic P sequence of D. subobscura reveals that it is a degraded element, located at the centromeric region of the A chromosome (X chromosome in this species), and that it is strongly diverged from the euchromatic P sequences previously described in this species. This heterochromatic sequence is composed of some P element fragments embedded in undefined beta-heterochromatic sequences. These mosaic P sequences do not show any transcriptional activity and seem to be ancient parasites of the D. subobscura genome. Phylogenetic analyses indicate that both the euchromatic and heterochromatic P sequences of D. subobscura could come from an ancestral element which was present before the divergence of the subobscura species cluster.
ISSN:0016-6707
1573-6857
DOI:10.1007/BF00132536