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Related Experiment Videos

Changes in Sef levels influence auditory brainstem development and function.

Victoria E Abraira1, Naomi Hyun, Andrew F Tucker

  • 1Department of Neurobiology, Harvard Medical School, Boston, Massachusetts 02115, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|April 20, 2007
PubMed
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Altering levels of Sef, a fibroblast growth factor (FGF) antagonist, impacts the development and function of the auditory brainstem. Both reduced and increased Sef disrupt auditory system assembly and neural signaling.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Fibroblast growth factor (FGF) signaling is crucial for central nervous system (CNS) development, regulating cell division, migration, and survival.
  • The FGF antagonist Sef plays a role in modulating FGF signaling pathways.
  • The auditory system provides an accessible model for studying neurodevelopmental effects.

Purpose of the Study:

  • To investigate the consequences of misregulating the FGF pathway, specifically by altering Sef levels, on the developing nervous system.
  • To focus on the auditory system to analyze the physiological effects of Sef dysregulation.

Main Methods:

  • Studied a mouse model with decreased Sef levels.
  • Analyzed the mitogen-activated protein kinase (MAPK) pathway activity in the rhombic lip.

Related Experiment Videos

  • Examined Sef expression patterns relative to FGF15 and FGFR1.
  • Assessed auditory nuclei morphology and glial fibrillary acidic protein (GFAP) expression in Sef mutant mice.
  • Performed electrophysiological analysis of auditory brainstem responses.

    • Main Results:

    • The MAPK pathway is active in the rhombic lip, a key neuronal progenitor zone.
    • Sef is expressed adjacent to the rhombic lip, suggesting a role in regulating FGF signaling.
    • Overexpression of Sef in chicks reduced auditory nuclei size.
    • Sef mutant mice exhibited cochlear nucleus defects, including dysmorphia and reduced GFAP.
    • Electrophysiological studies revealed abnormal auditory brainstem responses in Sef mutant mice.

    Conclusions:

    • Both reduced and increased Sef levels disrupt the assembly and function of the auditory brainstem.
    • Sef plays a critical role in the proper development and physiological function of the auditory system.
    • Modulating FGF signaling via Sef is essential for normal neurodevelopment in the auditory pathway.