Abstract
By means of renaturation kinetics of DNA of the three avian species Cairina domestica, Gallus domesticus and Columba livia domestica the following major DNA repetition classes were observed: a very fast reannealing fraction comprising about 15% of the DNA, a fast or intermediate reannealing fraction that makes up 10%, and a slow reannealing fraction of about 70%, which apparently renatures with single copy properties. — Comparing the reassociation behaviour of short (0.3 kb) and long (>2 kb) DNA fragments of duck and chicken it becomes apparent that only 12% (duck) and 28% (chicken) of the single copy DNA are interspersed with repetitive elements on 2 to 3 kb long fragments. The lengths of the repetitive sequences were estimated by optical hyperchromicity measurements, by agarose A-50 chromatography of S1 nuclease resistant duplexes and by electron microscopic measurements of the S1 nuclease resistant duplexes. It was found that in the case of the chicken DNA the single copy sequences alternating with middle repetitive ones are at least 2.3 kb long; the interspersed moderate repeats have a length average of at least 1.5 kb. The sequence length of the moderate repeats in duck DNA is smaller. The results show that the duck and the chicken genomes do not follow the short period interspersion pattern of genome organisation, characteristic of the eucaryotic organisms studied so far.
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Epplen, J.T., Leipoldt, M., Engel, W. et al. DNA sequence organisation in avian genomes. Chromosoma 69, 307–321 (1978). https://doi.org/10.1007/BF00332134
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DOI: https://doi.org/10.1007/BF00332134