Cited by 72Genetics and Neurodevelopmental DisordersHearing, Cochlea, Tinnitus, GeneticsNeuroscience and Neuropharmacology Research

Deletion of Fmr1 alters function and synaptic inputs in the auditory brainstem

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Rotschafer, Sarah E., Marshak, Sonya, Cramer, Karina S.·2015·PLOS ONE

Abstract

Fragile X Syndrome (FXS), a neurodevelopmental disorder, is the most prevalent single-gene cause of autism spectrum disorder. Autism has been associated with impaired auditory processing, abnormalities in the auditory brainstem response (ABR), and reduced cell number and size in the auditory brainstem nuclei. FXS is characterized by elevated cortical responses to sound stimuli, with some evidence for aberrant ABRs. Here, we assessed ABRs and auditory brainstem anatomy in Fmr1-/- mice, an animal model of FXS. We found that Fmr1-/- mice showed elevated response thresholds to both click and tone stimuli. Amplitudes of ABR responses were reduced in Fmr1-/- mice for early peaks of the ABR. The growth of the peak I response with sound intensity was less steep in mutants that in wild type mice. In contrast, amplitudes and response growth in peaks IV and V did not differ between these groups. We did not observe differences in peak latencies or in interpeak latencies. Cell size was reduced in Fmr1-/- mice in the ventral cochlear nucleus (VCN) and in the medial nucleus of the trapezoid body (MNTB). We quantified levels of inhibitory and excitatory synaptic inputs in these nuclei using markers for presynaptic proteins. We measured VGAT and VGLUT immunolabeling in VCN, MNTB, and the lateral superior olive (LSO). VGAT expression in MNTB was significantly greater in the Fmr1-/- mouse than in wild type mice. Together, these observations demonstrate that FXS affects peripheral and central aspects of hearing and alters the balance of excitation and inhibition in the auditory brainstem.

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  1. [6]Hagerman R, Goodlin-Jones BL, Spence S, Albrect L, Bacalman S, et al (2002) The fragile X premutation and autistic spectrum disorders. American Journal of Human Genetics 71: 287– 287.
  2. [10]Hagerman PJ, Greco CM, Hagerman RJ, Tassone F, Chudley AE, et al (2002) Neuronal intranuclear inclusions in a tremor/ataxia syndrome among fragile X premutation carriers. American Journal of Human Genetics 71: 259– 259.
  3. [18]Ferri R, Bergonzi P, Colognola RM, Musumeci SA, Petrella MA, et al (1987) Brain-stem auditory and visual evoked-potentials in fragile-x mental-retardation syndrome subjects. International Journal of Neuroscience 34: 172– 172.

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Authors
Rotschafer, S. E., Marshak, S., & Cramer, K. S.
Affiliations
University of California, Irvine (US)
Corresponding author
Cramer, Karina S.
Venue
PLOS ONE
Published
2015-02-13
Volume
10
Issue
2
Pages
e0117266
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2089345123
Cited by
72
References
61
Citations by year
2026: 1 · 2025: 5 · 2024: 5 · 2023: 8 · 2022: 15 · 2021: 4 · 2020: 6 · 2019: 10 · 2018: 6 · 2017: 6 · 2016: 5 · 2015: 1
FWCI
4.10
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Institutes of Health
  • University of California, Irvine
  • National Institute on Deafness and Other Communication Disorders (P30DC008369, T32DC010775)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Neuroscience › Sensory Systems › Hearing, Cochlea, Tinnitus, Genetics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
fragile X syndrome, Fmr1 knockout mice, auditory brainstem, auditory brainstem response, ventral cochlear nucleus, medial nucleus of the trapezoid body, lateral superior olive, synaptic inhibition, excitatory synaptic input, vesicular GABA transporter, vesicular glutamate transporter, excitation-inhibition balance, auditory processing, autism spectrum disorder
MeSH terms
Acoustic Stimulation, Animals, Auditory Pathways, Auditory Threshold, Brain Stem, Fragile X Syndrome, gamma-Aminobutyric Acid, Evoked Potentials, Auditory, Brain Stem, Gene Deletion, Cochlear Nucleus, Mice, Knockout, Mice, Fragile X Messenger Ribonucleoprotein 1, Synaptic Potentials, GABAergic Neurons

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