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  • Title: Repetitive sequences in the ribosomal intergenic spacer of Trypanosoma cruzi.
    Author: Novak EM, de Mello MP, Gomes HB, Galindo I, Guevara P, Ramirez JL, da Silveira JF.
    Journal: Mol Biochem Parasitol; 1993 Aug; 60(2):273-80. PubMed ID: 8232418.
    Abstract:
    A fragment of Trypanosoma cruzi ribosomal intergenic spacer (IGS) located at 6.7 kb from the 3' end of the 24S rRNA gene was analyzed. This IGS fragment is characterized by the presence of three types of repetitive elements (designated Spacer Repetitive Elements, SRE), short direct repeats (5-6 bp) and chi-like recombinational sequences. SRE elements are composed of relatively short repeats (43-145 bp) which show variabilities consisting of nucleotide changes, insertions and deletions. SRE-1 element (145 bp) has a short oligo(dA) tail at the end of the repeat and can be found flanked by other SRE elements. SRE elements are species-specific, suggesting that probes based on them may be diagnostic for Trypanosoma cruzi.
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