Macrocytic anemia and mitochondriopathy resulting from a defect in sideroflexin 4

Gordon J. Hildick-Smith, Jeffrey D. Cooney, Caterina Garone, Laura S. Kremer, Tobias B. Haack, Jonathan N. Thon, Non Miyata, Daniel S. Lieber, Sarah E. Calvo, H. Orhan Akman, Yvette Y. Yien, Nicholas C. Huston, Diana S. Branco, Dhvanit I. Shah, Matthew L. Freedman, Carla M. Koehler, Joseph E. Italiano, Andreas Merkenschlager, Skadi Beblo, Tim M. StromThomas Meitinger, Peter Freisinger, M. Alice Donati, Holger Prokisch, Vamsi K. Mootha, Salvatore DiMauro, Barry H. Paw

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Abstract

We used exome sequencing to identify mutations in sideroflexin 4 (SFXN4) in two children with mitochondrial disease (the more severe case also presented with macrocytic anemia). SFXN4 is an uncharacterized mitochondrial protein that localizes to the mitochondrial inner membrane. sfxn4 knockdown in zebrafish recapitulated the mitochondrial respiratory defect observed in both individuals and the macrocytic anemia with megaloblastic features of the more severe case. In vitro and in vivo complementation studies with fibroblasts from the affected individuals and zebrafish demonstrated the requirement of SFXN4 for mitochondrial respiratory homeostasis and erythropoiesis. Our findings establish mutations in SFXN4 as a cause of mitochondriopathy and macrocytic anemia.

Original languageEnglish
Pages (from-to)906-914
Number of pages9
JournalAmerican journal of human genetics
Volume93
Issue number5
DOIs
Publication statusPublished - Nov 7 2013
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Genetics
  • Genetics(clinical)

Cite this

Hildick-Smith, G. J., Cooney, J. D., Garone, C., Kremer, L. S., Haack, T. B., Thon, J. N., ... Paw, B. H. (2013). Macrocytic anemia and mitochondriopathy resulting from a defect in sideroflexin 4. American journal of human genetics, 93(5), 906-914. https://doi.org/10.1016/j.ajhg.2013.09.011