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 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.
Departament de Genètica, Facultat de Ciències Biològiques, Universitat de València, Spain.
N
N
Paricio
M J
MJ
Martínez-Sebastián
R
R
de Frutos
D000818:Animals; D001483:Base Sequence; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D004251:DNA Transposable Elements / Q000235:genetics*; D018076:DNA, Complementary; D004330:Drosophila / Q000235:genetics*; D006570:Heterochromatin / Q000235:genetics*; D008969:Molecular Sequence Data; D010802:Phylogeny; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D014158:Transcription, Genetic; D014960:X Chromosome
D004251:DNA Transposable Elements; D018076:DNA, Complementary; D006570:Heterochromatin