Friedreich's ataxia induced pluripotent stem cells model intergenerational GAATTC triplet repeat instability

Sherman Ku, Elisabetta Soragni, Erica Campau, Elizabeth A. Thomas, Gulsah Altun, Louise C. Laurent, Jeanne F. Loring, Marek Napierala, Joel M. Gottesfeld

Research output: Contribution to journalArticlepeer-review

176 Scopus citations

Abstract

The inherited neurodegenerative disease Friedreich's ataxia (FRDA) is caused by GAATTC triplet repeat hyperexpansions within the first intron of the FXN gene, encoding the mitochondrial protein frataxin. Long GAATTC repeats cause heterochromatin-mediated gene silencing and loss of frataxin in affected individuals. We report the derivation of induced pluripotent stem cells (iPSCs) from FRDA patient fibroblasts by transcription factor reprogramming. FXN gene repression is maintained in the iPSCs, as are the global gene expression signatures reflecting the human disease. GAATTC repeats uniquely in FXN in the iPSCs exhibit repeat instability similar to patient families, where they expand and/or contract with discrete changes in length between generations. The mismatch repair enzyme MSH2, implicated in repeat instability in other triplet repeat diseases, is highly expressed in pluripotent cells and occupies FXN intron 1, and shRNA silencing of MSH2 impedes repeat expansion, providing a possible molecular explanation for repeat expansion in FRDA.

Original languageEnglish (US)
Pages (from-to)631-637
Number of pages7
JournalCell Stem Cell
Volume7
Issue number5
DOIs
StatePublished - Nov 5 2010
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Medicine
  • Genetics
  • Cell Biology

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