Heterogeneity of the kinetoplast DNA molecules of Trypanosoma cruzi

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Abstract
Kinetoplast DNA (kDNA) of the culture form of T. cruzi is cleaved by restriction endonucleases (HpaII, HindII, EcoRI and HaeIII). The analysis of the cleavage patterns proves that the minicircles (free circular genome units) are heterogeneous in base sequences. The same results are obtained with the complex kDNA network which is composed of the association of minicircles and linear molecules. Kinetic studies of the renaturation of kDNA previously cleaved by HpaII into fragments of the genome unit size show at least 2 populations of molecules. About 75% of these molecules correspond to the fast renaturing population having the molecular complexity of the minicircles. The molecules of the slow renaturing population have a much higher molecular complexity than the minicircles and do not seem to be related to the majority of the long linear molecules.

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