Details

Autor(en) / Beteiligte

• Holzerova, Eliska
• Danhauser, Katharina
• Haack, Tobias B
• Kremer, Laura S
• Melcher, Marlen
• Ingold, Irina
• Kobayashi, Sho
• Terrile, Caterina
• Wolf, Petra
• Schaper, Jörg
• Mayatepek, Ertan
• Baertling, Fabian
• Friedmann Angeli, José Pedro
• Conrad, Marcus
• Strom, Tim M
• Meitinger, Thomas
• Prokisch, Holger
• Distelmaier, Felix

Titel

Human thioredoxin 2 deficiency impairs mitochondrial redox homeostasis and causes early-onset neurodegeneration

Ist Teil von

• Brain (London, England : 1878), 2016-02, Vol.139 (Pt 2), p.346-354

Ort / Verlag

England

Erscheinungsjahr

2016

Quelle

Oxford Journals 2020 Medicine

Beschreibungen/Notizen

• Thioredoxin 2 (TXN2; also known as Trx2) is a small mitochondrial redox protein essential for the control of mitochondrial reactive oxygen species homeostasis, apoptosis regulation and cell viability. Exome sequencing in a 16-year-old adolescent suffering from an infantile-onset neurodegenerative disorder with severe cerebellar atrophy, epilepsy, dystonia, optic atrophy, and peripheral neuropathy, uncovered a homozygous stop mutation in TXN2. Analysis of patient-derived fibroblasts demonstrated absence of TXN2 protein, increased reactive oxygen species levels, impaired oxidative stress defence and oxidative phosphorylation dysfunction. Reconstitution of TXN2 expression restored all these parameters, indicating the causal role of TXN2 mutation in disease development. Supplementation with antioxidants effectively suppressed cellular reactive oxygen species production, improved cell viability and mitigated clinical symptoms during short-term follow-up. In conclusion, our report on a patient with TXN2 deficiency suggests an important role of reactive oxygen species homeostasis for human neuronal maintenance and energy metabolism.