Journal Article

Frataxin is Reduced in Friedreich Ataxia Patients and is Associated with Mitochondrial Membranes

Victoria Campuzano, Laura Montermini, Yves Lutz, Lidia Cova, Colette Hindelang, Sarn Jiralerspong, Yvon Trottier, Stephen J. Kish, Baptiste Faucheux, Paul Trouillas, François J. Authier, Alexandra Dürr, Jean-Louis Mandel, Angelo Vescovi, Massimo Pandolfo and Michel Koenig

in Human Molecular Genetics

Volume 6, issue 11, pages 1771-1780
Published in print October 1997 | ISSN: 0964-6906
Published online October 1997 | e-ISSN: 1460-2083 | DOI: http://dx.doi.org/10.1093/hmg/6.11.1771
Frataxin is Reduced in Friedreich Ataxia Patients and is Associated with Mitochondrial Membranes

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Friedreich ataxia is a progressive neurodegenerative disorder caused by loss of function mutations in the frataxin gene. In order to unravel frataxin function we developed monoclonal antibodies raised against different regions of the protein. These antibodies detect a processed 18 kDa protein in various human and mouse tissues and cell lines that is severely reduced in Friedreich ataxia patients. By immunocytofluorescence and immunocytoelectron microscopy we show that frataxin is located in mitochondria, associated with the mitochondrial membranes and crests. Analysis of cellular localization of various truncated forms of frataxin expressed in cultured cells and evidence of removal of an N-terminal epitope during protein maturation demonstrated that the mitochondrial targetting sequence is encoded by the first 20 amino acids. Given the shared clinical features between Friedreich ataxia, vitamin E deficiency and some mitochondriopathies, our data suggest that a reduction in frataxin results in oxidative damage.

Journal Article.  6978 words.  Illustrated.

Subjects: Genetics and Genomics

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