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Extrachromosomal RNA–DNA complex containing long telomeric repeats in chironomids
Author(s) -
Rosén M.,
Kamnert I.,
Edström J.E.
Publication year - 2002
Publication title -
insect molecular biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.955
H-Index - 93
eISSN - 1365-2583
pISSN - 0962-1075
DOI - 10.1046/j.1365-2583.2002.00322.x
Subject(s) - extrachromosomal dna , biology , dna , rna , rnase p , telomerase , microbiology and biotechnology , genomic dna , genetics , gene , plasmid
We have analysed an extracted RNase sensitive fraction containing telomeric repeat sequences in the telomerase negative dipteran Chironomus tentans . It shows a slow and well‐defined electophoretic migration corresponding to > 20 kb and is sensitive not only to RNase, but also to DNase. It hybridizes to both strands of the telomeric repeat with about equal intensities. DNA is probably the dominant component since the fraction is only slightly heavier than genomic DNA in isopycnic gradients but considerably lighter than RNA. It can, nevertheless, be shown to incorporate tritiated uridine. The material might represent another example of extrachromosomal telomeric repeats in telomerase negative cells.