Female CGG knock-in mice modeling the fragile X premutation are impaired on a skilled forelimb reaching task

Amanda A. Diep, Michael R. Hunsaker, Richard Kwock, Kyoungmi Kim, Rob Willemsen, Robert F Berman

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The fragile X premutation is a tandem CGG trinucleotide repeat expansion in the fragile X mental retardation 1 (FMR1) gene between 55 and 200 repeats in length. A CGG knock-in (CGG KI) mouse has been developed that models the neuropathology and cognitive deficits reported in fragile X premutation carriers. Previous studies have demonstrated that CGG KI mice have spatiotemporal information processing deficits and impaired visuomotor function that worsen with increasing CGG repeat length. Since skilled forelimb reaching requires integration of information from the visual and motor systems, skilled reaching performance could identify potential visuomotor dysfunction in CGG KI mice. To characterize motor deficits associated with the fragile X premutation, 6. month old female CGG KI mice heterozygous for trinucleotide repeats ranging from 70-200. CGG in length were tested for their ability to learn a skilled forelimb reaching task. The results demonstrate that female CGG KI mice show deficits for learning a skilled forelimb reaching task compared to wildtype littermates, and that these deficits worsen with increasing CGG repeat lengths.

Original languageEnglish (US)
Pages (from-to)229-234
Number of pages6
JournalNeurobiology of Learning and Memory
Volume97
Issue number2
DOIs
StatePublished - Feb 2012

Keywords

  • Fragile X premutation
  • Fragile X-associated disorders
  • Motor function
  • Skilled reaching
  • Transgenic mice

ASJC Scopus subject areas

  • Behavioral Neuroscience
  • Cognitive Neuroscience
  • Experimental and Cognitive Psychology

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