Downregulation of MicroRNA-9 in iPSC-Derived Neurons of FTD/ALS Patients with TDP-43 Mutations

Zhijun Zhang, Sandra Almeida, Yubing Lu, Agnes L. Nishimura, Lingtao Peng, Danqiong Sun, Bei Wu, Anna M. Karydas, Maria C. Tartaglia, Jamie C. Fong, Bruce L. Miller, Robert V. Farese, Melissa J. Moore, Christopher E. Shaw, Fen-Biao Gao*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

110 Citations (Scopus)

Abstract

Transactive response DNA-binding protein 43 (TDP-43) is a major pathological protein in frontotemporal dementia (FTD) and amyotrophic lateral sclerosis (ALS). There are many disease-associated mutations in TDP-43, and several cellular and animal models with ectopic overexpression of mutant TDP-43 have been established. Here we sought to study altered molecular events in FTD and ALS by using induced pluripotent stem cell (iPSC) derived patient neurons. We generated multiple iPSC lines from an FTD/ALS patient with the TARDBP A90V mutation and from an unaffected family member who lacked the mutation. After extensive characterization, two to three iPSC lines from each subject were selected, differentiated into postmitotic neurons, and screened for relevant cell-autonomous phenotypes. Patient-derived neurons were more sensitive than control neurons to 100 nM straurosporine but not to other inducers of cellular stress. Three disease-relevant cellular phenotypes were revealed under staurosporine-induced stress. First, TDP-43 was localized in the cytoplasm of a higher percentage of patient neurons than control neurons. Second, the total TDP-43 level was lower in patient neurons with the A90V mutation. Third, the levels of microRNA-9 (miR-9) and its precursor pri-miR-9-2 decreased in patient neurons but not in control neurons. The latter is likely because of reduced TDP-43, as shRNA-mediated TDP-43 knockdown in rodent primary neurons also decreased the pri-miR-9-2 level. The reduction in miR-9 expression was confirmed in human neurons derived from iPSC lines containing the more pathogenic TARDBP M337V mutation, suggesting miR-9 downregulation might be a common pathogenic event in FTD/ALS. These results show that iPSC models of FTD/ALS are useful for revealing stress-dependent cellular defects of human patient neurons containing rare TDP-43 mutations in their native genetic contexts.

Original languageEnglish
Article numbere76055
Pages (from-to)N/A
Number of pages11
JournalPL o S One
Volume8
Issue number10
DOIs
Publication statusPublished - 15 Oct 2013

Keywords

  • AMYOTROPHIC-LATERAL-SCLEROSIS
  • FRONTOTEMPORAL LOBAR DEGENERATION
  • PLURIPOTENT STEM-CELLS
  • HEXANUCLEOTIDE REPEAT
  • MOTOR-NEURONS
  • RNA TARGETS
  • ALS
  • PROTEIN
  • DEMENTIA
  • DISEASE

Fingerprint

Dive into the research topics of 'Downregulation of MicroRNA-9 in iPSC-Derived Neurons of FTD/ALS Patients with TDP-43 Mutations'. Together they form a unique fingerprint.

Cite this