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Human Molecular Genetics, 2000, Vol. 9, No. 8 1219-1226
© 2000 Oxford University Press

Inactivation of the Friedreich ataxia mouse gene leads to early embryonic lethality without iron accumulation

Mireille Cossée, Hélène Puccio, Anne Gansmuller, Hana Koutnikova, Andrée Dierich, Marianne LeMeur, Kenneth Fischbeck+, Pascal Dollé and Michel Koenig§

Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), CNRS/INSERM/Université Louis Pasteur, Hôpitaux Universitaires de Strasbourg, 1 rue Laurent Fries BP 163, 67404 Illkirch, France

Friedreich ataxia (FRDA), the most common autosomal recessive ataxia, is caused in almost all cases by homozygous intronic expansions resulting in the loss of frataxin, a mitochondrial protein conserved through evolution, and involved in mitochondrial iron homeostasis. Yeast knockout models, and histological and biochemical data from patient heart biopsies or autopsies indicate that the frataxin defect causes a specific iron–sulfur protein deficiency and mitochondrial iron accumulation leading to the pathological changes. Affected human tissues are rarely available to further examine this hypothesis. To study the mechanism of the disease, we generated a mouse model by deletion of exon 4 leading to inactivation of the Frda gene product. We show that homozygous deletions cause embryonic lethality a few days after implantation, demonstrating an important role for frataxin during early development. These results suggest that the milder phenotype in humans is due to residual frataxin expression associated with the expansion mutations. Surprisingly, in the frataxin knockout mouse, no iron accumulation was observed during embryonic resorption, suggesting that cell death could be due to a mechanism independent of iron accumulation.

+ Present address: Neurogenetics Branch, NINDS, NIH, Bethesda, MD, USA

§ To whom correspondence should be addressed. Tel: +33 3 88 65 33 99; Fax: +33 3 88 65 32 46; Email: mkoenig@igbmc.u-strasbg.fr


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