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    White Matter Alterations in Fmr1 Knockout Mice during Early Postnatal Brain Development

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    Author
    Shi, D.
    Xu, S.
    Zhuo, J.
    McKenna, M.C.
    Gullapalli, R.P.
    Date
    2020
    Journal
    Developmental Neuroscience
    Publisher
    S. Karger AG
    Type
    Article
    
    Metadata
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    See at
    https://doi.org/10.1159/000506679
    Abstract
    Fragile X syndrome (FXS) is the most commonly inherited form of intellectual disability ascribed to the autism spectrum disorder. Studies with FXS patients have reported altered white matter volume compared to controls. The Fmr1 knockout (KO) mouse, a model for FXS, showed evidence of delayed myelination during postnatal brain development. In this study, we examined several white matter regions in the male Fmr1 KO mouse brain compared to male wild-type (WT) mice at postnatal days (PND) 18, 21, 30, and 60, which coincide with critical stages of myelination and postnatal brain development. White matter volume, T2 relaxation time, and magnetization transfer ratio (MTR) were measured using magnetic resonance imaging and myelin content was determined with histological staining of myelin. Differences in the developmental accumulation of white matter and myelin between Fmr1 KO and WT mice were observed in the corpus callosum, external and internal capsules, cerebral peduncle, and fimbria. Alterations were more predominant in the external and internal capsules and fimbria of Fmr1 KO mice, where the MTR was lower at PND 18, then elevated at PND 30, and again lower at PND 60 compared to the corresponding regions in WT mice. The pattern of changes in MTR were similar to those observed in myelin staining and could be related to the altered protein synthesis that is a hallmark of FXS. While no significant changes in white matter volumes and T2 relaxation time between the Fmr1 KO and WT mice were observed, the altered pattern of myelin staining and MTR, particularly in the external capsule, reflecting the abnormalities associated with myelin content is suggestive of a developmental delay in the white matter of Fmr1 KO mouse brain. These early differences in white matter during critical developmental stages may contribute to altered brain networks in the Fmr1 KO mice.
    Keyword
    Fmr1 knockout
    Fragile X syndrome
    Magnetization transfer
    Myelination
    T2 relaxation
    Identifier to cite or link to this item
    https://www.scopus.com/inward/record.uri?eid=2-s2.0-85084408379&doi=10.1159%2f000506679&partnerID=40&md5=b8820fe81745ff7e360b71f5c48c733c; http://hdl.handle.net/10713/12806
    ae974a485f413a2113503eed53cd6c53
    10.1159/000506679
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    UMB Open Access Articles 2020

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