Cited by 40Genetics and Neurodevelopmental DisordersNeuroscience and Neuropharmacology ResearchHearing, Cochlea, Tinnitus, Genetics

Intense and specialized dendritic localization of the fragile X mental retardation protein in binaural brainstem neurons: a comparative study in the alligator, chicken, gerbil, and human

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Wang, Yuan, Sakano, Hitomi, Beebe, Karisa, Brown, Maile R., de Laat, Rian, Bothwell, Mark, Kulesza, Randy J., Rubel, Edwin W·2014·Journal of Comparative Neurology

Abstract

Neuronal dendrites are structurally and functionally dynamic in response to changes in afferent activity. The fragile X mental retardation protein (FMRP) is an mRNA binding protein that regulates activity‐dependent protein synthesis and morphological dynamics of dendrites. Loss and abnormal expression of FMRP occur in fragile X syndrome (FXS) and some forms of autism spectrum disorders. To provide further understanding of how FMRP signaling regulates dendritic dynamics, we examined dendritic expression and localization of FMRP in the reptilian and avian nucleus laminaris (NL) and its mammalian analogue, the medial superior olive (MSO), in rodents and humans. NL/MSO neurons are specialized for temporal processing of low‐frequency sounds for binaural hearing, which is impaired in FXS. Protein BLAST analyses first demonstrate that the FMRP amino acid sequences in the alligator and chicken are highly similar to human FMRP with identical mRNA‐binding and phosphorylation sites, suggesting that FMRP functions similarly across vertebrates. Immunocytochemistry further reveals that NL/MSO neurons have very high levels of dendritic FMRP in low‐frequency hearing vertebrates including alligator, chicken, gerbil, and human. Remarkably, dendritic FMRP in NL/MSO neurons often accumulates at branch points and enlarged distal tips, loci known to be critical for branch‐specific dendritic arbor dynamics. These observations support an important role for FMRP in regulating dendritic properties of binaural neurons that are essential for low‐frequency sound localization and auditory scene segregation, and support the relevance of studying this regulation in nonhuman vertebrates that use low frequencies in order to further understand human auditory processing disorders. J. Comp. Neurol. 522:2107–2128, 2014. © 2013 Wiley Periodicals, Inc.

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Authors
Wang, Y., Sakano, H., Beebe, K., Brown, M. R., de Laat, R., Bothwell, M., Kulesza, R. J., & Rubel, E. W.
Affiliations
  • University of Washington (US)
  • Lake Erie College of Osteopathic Medicine (US)
  • Yale University (US)
  • Institute for Stem Cell and Regenerative Medicine and Department of Physiology and Biophysics University of Washington Seattle WA 98109
Corresponding author
Rubel, Edwin W
Venue
Journal of Comparative Neurology
Publisher
Wiley
Published
2014-04-19
Volume
522
Issue
9
Pages
2107-2128
ISSN
  • 0021-9967 (ISSN-L)
  • 1096-9861
OpenAlex
W2103174972
Cited by
40
References
106
Citations by year
2025: 2 · 2024: 1 · 2023: 4 · 2022: 4 · 2021: 3 · 2020: 5 · 2019: 3 · 2018: 3 · 2017: 5 · 2016: 5 · 2015: 3 · 2014: 2
FWCI
2.21
Type
journal article
Language
en
Open access
Locations
  • The Journal of Comparative Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute on Deafness and Other Communication Disorders (DC-03829, DC-02739, DC04661, DC 00018, R01DC013074, R21DC011594, R01DC003829, R01DC002739, T32DC000018, DC-011594, P30DC004661)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Sensory Systems › Hearing, Cochlea, Tinnitus, Genetics
Keywords
FMRP, dendritic localization, nucleus laminaris, medial superior olive, binaural hearing, fragile X syndrome, autism spectrum disorder, comparative neurobiology, alligators, chickens, gerbils, human
MeSH terms
Aged, Aged, 80 and over, Alligators and Crocodiles, Animals, Brain Stem, Chickens, Dendrites, Female, Gerbillinae, Humans, Male, Middle Aged, Species Specificity, Rats, Sprague-Dawley, Sequence Homology, Amino Acid, Avian Proteins, Reptilian Proteins, Fragile X Messenger Ribonucleoprotein 1, Superior Olivary Complex

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