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Corpus Systématique Animale

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Length and interspersion of repetitive and non repetitive DNA sequences in four Amphibian species with different genome sizes

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  • Cosima T. Baldari 1
  • Francesco Amaldi 1
  • 1) Centro di Studio per gli Acidi Nucleici, C.N.R., Istituto di Fisiologia Generale, Università di Roma, 00100, Roma, Italy

The interspersion period of repetitive and unique sequences was analyzed by two different methods, electron microscopy and agarose gel electrophoresis, for four Amphibian species with different nuclear DNA content, namely the Anura Xenopus laevis (3 pg DNA per haploid genome) and Bufo bufo (7 pg) and the Urodela Triturus cristatus (23 pg) and Necturus maculosus (52 pg). Within each of the two subclasses it has been found that interspecific differences, in DNA content, due to variations in the amount of repetitive sequences, do not involve variations in length of the interspersed repetitive sequences. They remain about 380 base pairs. Furthermore, the unique sequences length has been found to be shorter in Bufo (760 base pairs) than in Xenopus (1600) and in Necturus (880) than in Triturus (1340). A study of the interspersion period has shown that the great difference in DNA content between Anura and Urodela, which had been previously shown not to have involved changes in the relative amounts of the various sequence classes, does not involve changes in the interspersion period.

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  • 1 - health sciences
  • 2 - biomedical research
  • 3 - developmental biology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - vertebres: reproduction
Catégories Scopus
  • 1 - Health Sciences ; 2 - Medicine ; 3 - Genetics(clinical)
  • 1 - Life Sciences ; 2 - Biochemistry, Genetics and Molecular Biology ; 3 - Genetics
Catégories WoS
  • 1 - science ; 2 - genetics & heredity
  • 1 - science ; 2 - biochemistry & molecular biology
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