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Coexistence of Mutations in PINK1 and Mitochondrial DNA in Early Onset Parkinsonism
  1. Claudia Piccoli
  1. University of Foggia, Italy
    1. Maria Ripoli
    1. University of Foggia, Italy
      1. Giovanni Quarato
      1. University of Foggia, Italy
        1. Rosella Scrima
        1. University of Foggia, Italy
          1. Annamaria D'Aprile
          1. University of Foggia, Italy
            1. Domenico Boffoli
            1. University of Foggia, Italy
              1. Maurizio Margaglione
              1. University of Foggia, Italy
                1. Chiara Criscuolo
                1. Federico II University of Naples, Italy
                  1. Giuseppe De Michele
                  1. Federico II University of Naples, Italy
                    1. Annamaria Sardanelli
                    1. University of Bari, Italy
                      1. Sergio Papa
                      1. University of Bari, Italy
                        1. Nazzareno Capitanio (n.cap{at}unifg.it)
                        1. University of Foggia, Italy

                          Abstract

                          Abstract Aims and background. Various genes have been identified for monogenic disorders resembling Parkinson disease. The products of some of these genes are associated with mitochondria and have been implicated in cellular protection against oxidative damage. In the present study we analysed fibroblasts from a patient carrying the homozygous mutation p.W437X in the PTEN-induced kinase 1 (PINK1), which manifested a very early onset parkinsonism.

                          Results Patient's fibroblasts did not show variation in the mtDNA copy number or in the expression of the oxidative phosphorylation complexes. Sequence analysis of the patient’s mtDNA presented two new missense mutations in the ND5 (m.12397A>G, p.T21A) and ND6 (m. 14319T>C, p.N119D) genes coding for two subunits of Complex I. The two mutations were homoplasmic in both the patient and the patient’s mother. Patient’s fibroblasts resulted in enhanced constitutive production of the superoxide anion radical that was abrogated by inhibitor of the complex I. Moreover enzyme kinetic analysis of the NADH:ubiquinone oxidoreductase showed changes in the substrates affinity.

                          Conclusion To our knowledge, this is the first report showing co-segregation of a PD-related nuclear gene mutation with mtDNA mutation(s). Our observation might shed light on the clinical heterogeneity of the hereditary cases of PD, highlighting the hitherto unappreciated impact of coexisting mtDNA mutations in determining the development and the clinical course of the disease.

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