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A Mouse Model of the Human Fragile X Syndrome I304N Mutation

The mental retardation, autistic features, and behavioral abnormalities characteristic of the Fragile X mental retardation syndrome result from the loss of function of the RNA–binding protein FMRP. The disease is usually caused by a triplet repeat expansion in the 5′UTR of the FMR1 gene. This leads...

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Autores principales: Zang, Julie B., Nosyreva, Elena D., Spencer, Corinne M., Volk, Lenora J., Musunuru, Kiran, Zhong, Ru, Stone, Elizabeth F., Yuva-Paylor, Lisa A., Huber, Kimberly M., Paylor, Richard, Darnell, Jennifer C., Darnell, Robert B.
Formato: Texto
Lenguaje:English
Publicado: Public Library of Science 2009
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2779495/
https://www.ncbi.nlm.nih.gov/pubmed/20011099
http://dx.doi.org/10.1371/journal.pgen.1000758
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author Zang, Julie B.
Nosyreva, Elena D.
Spencer, Corinne M.
Volk, Lenora J.
Musunuru, Kiran
Zhong, Ru
Stone, Elizabeth F.
Yuva-Paylor, Lisa A.
Huber, Kimberly M.
Paylor, Richard
Darnell, Jennifer C.
Darnell, Robert B.
author_facet Zang, Julie B.
Nosyreva, Elena D.
Spencer, Corinne M.
Volk, Lenora J.
Musunuru, Kiran
Zhong, Ru
Stone, Elizabeth F.
Yuva-Paylor, Lisa A.
Huber, Kimberly M.
Paylor, Richard
Darnell, Jennifer C.
Darnell, Robert B.
author_sort Zang, Julie B.
collection PubMed
description The mental retardation, autistic features, and behavioral abnormalities characteristic of the Fragile X mental retardation syndrome result from the loss of function of the RNA–binding protein FMRP. The disease is usually caused by a triplet repeat expansion in the 5′UTR of the FMR1 gene. This leads to loss of function through transcriptional gene silencing, pointing to a key function for FMRP, but precluding genetic identification of critical activities within the protein. Moreover, antisense transcripts (FMR4, ASFMR1) in the same locus have been reported to be silenced by the repeat expansion. Missense mutations offer one means of confirming a central role for FMRP in the disease, but to date, only a single such patient has been described. This patient harbors an isoleucine to asparagine mutation (I304N) in the second FMRP KH-type RNA–binding domain, however, this single case report was complicated because the patient harbored a superimposed familial liver disease. To address these issues, we have generated a new Fragile X Syndrome mouse model in which the endogenous Fmr1 gene harbors the I304N mutation. These mice phenocopy the symptoms of Fragile X Syndrome in the existing Fmr1–null mouse, as assessed by testicular size, behavioral phenotyping, and electrophysiological assays of synaptic plasticity. I304N FMRP retains some functions, but has specifically lost RNA binding and polyribosome association; moreover, levels of the mutant protein are markedly reduced in the brain specifically at a time when synapses are forming postnatally. These data suggest that loss of FMRP function, particularly in KH2-mediated RNA binding and in synaptic plasticity, play critical roles in pathogenesis of the Fragile X Syndrome and establish a new model for studying the disorder.
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spelling pubmed-27794952009-12-15 A Mouse Model of the Human Fragile X Syndrome I304N Mutation Zang, Julie B. Nosyreva, Elena D. Spencer, Corinne M. Volk, Lenora J. Musunuru, Kiran Zhong, Ru Stone, Elizabeth F. Yuva-Paylor, Lisa A. Huber, Kimberly M. Paylor, Richard Darnell, Jennifer C. Darnell, Robert B. PLoS Genet Research Article The mental retardation, autistic features, and behavioral abnormalities characteristic of the Fragile X mental retardation syndrome result from the loss of function of the RNA–binding protein FMRP. The disease is usually caused by a triplet repeat expansion in the 5′UTR of the FMR1 gene. This leads to loss of function through transcriptional gene silencing, pointing to a key function for FMRP, but precluding genetic identification of critical activities within the protein. Moreover, antisense transcripts (FMR4, ASFMR1) in the same locus have been reported to be silenced by the repeat expansion. Missense mutations offer one means of confirming a central role for FMRP in the disease, but to date, only a single such patient has been described. This patient harbors an isoleucine to asparagine mutation (I304N) in the second FMRP KH-type RNA–binding domain, however, this single case report was complicated because the patient harbored a superimposed familial liver disease. To address these issues, we have generated a new Fragile X Syndrome mouse model in which the endogenous Fmr1 gene harbors the I304N mutation. These mice phenocopy the symptoms of Fragile X Syndrome in the existing Fmr1–null mouse, as assessed by testicular size, behavioral phenotyping, and electrophysiological assays of synaptic plasticity. I304N FMRP retains some functions, but has specifically lost RNA binding and polyribosome association; moreover, levels of the mutant protein are markedly reduced in the brain specifically at a time when synapses are forming postnatally. These data suggest that loss of FMRP function, particularly in KH2-mediated RNA binding and in synaptic plasticity, play critical roles in pathogenesis of the Fragile X Syndrome and establish a new model for studying the disorder. Public Library of Science 2009-12-11 /pmc/articles/PMC2779495/ /pubmed/20011099 http://dx.doi.org/10.1371/journal.pgen.1000758 Text en Zang et al. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Zang, Julie B.
Nosyreva, Elena D.
Spencer, Corinne M.
Volk, Lenora J.
Musunuru, Kiran
Zhong, Ru
Stone, Elizabeth F.
Yuva-Paylor, Lisa A.
Huber, Kimberly M.
Paylor, Richard
Darnell, Jennifer C.
Darnell, Robert B.
A Mouse Model of the Human Fragile X Syndrome I304N Mutation
title A Mouse Model of the Human Fragile X Syndrome I304N Mutation
title_full A Mouse Model of the Human Fragile X Syndrome I304N Mutation
title_fullStr A Mouse Model of the Human Fragile X Syndrome I304N Mutation
title_full_unstemmed A Mouse Model of the Human Fragile X Syndrome I304N Mutation
title_short A Mouse Model of the Human Fragile X Syndrome I304N Mutation
title_sort mouse model of the human fragile x syndrome i304n mutation
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2779495/
https://www.ncbi.nlm.nih.gov/pubmed/20011099
http://dx.doi.org/10.1371/journal.pgen.1000758
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