TY - JOUR
AU - Andrea M. Peier, Kellie L. McIlwain, Aileen Kenneson, Stephen T. Warren, Richard Paylor, David L. Nelson
AB - Fragile X syndrome is a common cause of mental retardation involving loss of expression of the FMR1 gene. The role of FMR1 remains undetermined but the protein appears to be involved in RNA metabolism. Fmr1 knockout mice exhibit a phenotype with some similarities to humans, such as macroorchidism and behavioral abnormalities. As a step toward understanding the function of FMR1 and the determination of the potential for therapeutic approaches to fragile X syndrome, yeast artificial chromosome (YAC) transgenic mice were generated in order to determine whether the Fmr1 knockout mouse phenotype could be rescued. Several transgenic lines were generated that carried the entire FMR1 locus with extensive amounts of flanking sequence. We observed that the YAC transgene supported production of the human protein (FMRP) which was present at levels 10 to 15 times that of endogenous protein and was expressed in a cell- and tissue-specific manner. Macro­orchidism was absent in knockout mice carrying the YAC transgene indicating functional rescue by the human protein. Given the complex behavioral phenotype in fragile X patients and the mild phenotype previously reported for the Fmr1 knockout mouse, we performed a more thorough evaluation of the Fmr1 knockout phenotype using additional behavioral assays that had not previously been reported for this animal model. The mouse displayed reduced anxiety-related responses with increased exploratory behavior. FMR1 YAC transgenic mice overexpressing the human protein did produce opposing behavioral responses and additional abnormal behaviors were also observed. These findings have significant implications for gene therapy for fragile X syndrome since overexpression of the gene may harbor its own phenotype. Received 22 December 1999; Revised and Accepted 7 March 2000. « Previous | Next Article » Table of Contents This Article Hum. Mol. Genet. (2000) 9 (8): 1145-1159. doi: 10.1093/hmg/9.8.1145 » Abstract Free Full Text (HTML) Free Full Text (PDF) Free Classifications Article Services Article metrics Alert me when cited Alert me if corrected Find similar articles Similar articles in Web of Science Similar articles in PubMed Add to my archive Download citation Request Permissions Citing Articles Load citing article information Citing articles via CrossRef Citing articles via Scopus Citing articles via Web of Science Citing articles via Google Scholar Google Scholar Articles by Peier, A. M. Articles by Nelson, D. L. Search for related content PubMed PubMed citation Articles by Peier, A. M. Articles by McIlwain, K. L. Articles by Kenneson, A. Articles by Warren, S. T. Articles by Paylor, R. Articles by Nelson, D. L. Related Content Load related web page information Share Email this article CiteULike Delicious Facebook Google+ Mendeley Twitter What's this? 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TI - (Over)correction of FMR1 deficiency with YAC transgenics: behavioral and physical features
JF - Human Molecular Genetics
DO - 10.1093/hmg/9.8.1145
DA - 2000-05-01
UR - https://www.deepdyve.com/lp/oxford-university-press/over-correction-of-fmr1-deficiency-with-yac-transgenics-behavioral-and-hfmQ7faKBk
SP - 1145
VL - 9
IS - 8
DP - DeepDyve
ER -