Homology of Balbiani Ring DNA in two closely related Chironomus species |
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Authors: | B. Lambert W. Beermann |
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Affiliation: | 1. Department of Histology, Karolinska Institutet, S 10401, Stockholm 60, Sweden 2. Max-Planck-Institut für Biologie, 74, Tübingen, Federal Republic of Germany
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Abstract: | Cytogenetic analysis indicates that Balbiani Ring 2 (BR 2) in the two sibling species Chironomus tentans and Chironomus pallidivittatus arises from identifically banded segments in the salivary gland polytene chromosomes, although chromosomal rearrangements have occurred. In situ hybridization of BR 2 RNA to the polytene chromosomes of each individual species, as well as their F1 hybrids, reveals that the repetitious BR 2 DNA in the two species has, within the limits of the technique, retained identity of nucleotide sequences and degree of repetition. The DNA of the naturally expressed BR 1 and BR 3 in both species and that ot the galactose induced BR 6 in C. pallidivittatus did not hybridize with BR 2 RNA, indicating that these BR's are different from BR 2 with regard to sequence content. |
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