C9orf72 BAC Transgenic Mice Display Typical Pathologic Features of ALS/FTD

Neuron. 2015 Dec 2;88(5):892-901. doi: 10.1016/j.neuron.2015.10.027.


Noncoding expansions of a hexanucleotide repeat (GGGGCC) in the C9orf72 gene are the most common cause of familial amyotrophic lateral sclerosis and frontotemporal dementia. Here we report transgenic mice carrying a bacterial artificial chromosome (BAC) containing the full human C9orf72 gene with either a normal allele (15 repeats) or disease-associated expansion (∼100-1,000 repeats; C9-BACexp). C9-BACexp mice displayed pathologic features seen in C9orf72 expansion patients, including widespread RNA foci and repeat-associated non-ATG (RAN) translated dipeptides, which were suppressed by antisense oligonucleotides targeting human C9orf72. Nucleolin distribution was altered, supporting that either C9orf72 transcripts or RAN dipeptides promote nucleolar dysfunction. Despite early and widespread production of RNA foci and RAN dipeptides in C9-BACexp mice, behavioral abnormalities and neurodegeneration were not observed even at advanced ages, supporting the hypothesis that RNA foci and RAN dipeptides occur presymptomatically and are not sufficient to drive neurodegeneration in mice at levels seen in patients.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Age Factors
  • Amyotrophic Lateral Sclerosis / genetics
  • Amyotrophic Lateral Sclerosis / pathology*
  • Amyotrophic Lateral Sclerosis / physiopathology
  • Animals
  • Brain / metabolism
  • Brain / pathology*
  • C9orf72 Protein
  • Cells, Cultured
  • Chromosomes, Artificial, Bacterial / genetics
  • Chromosomes, Artificial, Bacterial / metabolism
  • DNA Repeat Expansion / genetics*
  • Disease Models, Animal
  • Frontotemporal Dementia / genetics
  • Frontotemporal Dementia / pathology*
  • Frontotemporal Dementia / physiopathology
  • Glutamic Acid / pharmacology
  • Humans
  • Mice
  • Mice, Transgenic
  • Motor Activity / genetics
  • Muscle Strength / genetics
  • Neuromuscular Junction / genetics
  • Neuromuscular Junction / pathology
  • Neurons / drug effects
  • Proteins / genetics*
  • Psychomotor Performance / physiology
  • Spinal Cord / metabolism
  • Spinal Cord / pathology*


  • C9orf72 Protein
  • C9orf72 protein, human
  • Proteins
  • Glutamic Acid