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Expression pattern and functional characterization of connexin29 in transgenic mice
Jürgen Eiberger1, Mark Kibschull, Nicola Strenzke
1Institut für Genetik, Universität Bonn, Bonn, Germany.
Glia
|January 26, 2006
Summary
Connexin29 (Cx29) is found in various cells, including those in the nervous system and developing bones. However, Cx29-deficient mice show no myelin defects or functional deficits, indicating it does not impact adult myelin function.
Area of Science:
- Neuroscience
- Cell Biology
- Genetics
Background:
- Connexins (Cx) are gap junction proteins crucial for cell communication.
- Connexin29 (Cx29) expression has been previously suggested in myelinating cells.
- The specific role of Cx29 in myelin function remains unclear.
Purpose of the Study:
- To investigate the expression pattern of connexin29 (Cx29) using a novel transgenic mouse model.
- To determine the functional significance of Cx29 in myelin and nerve conduction in adult mice.
Main Methods:
- Generation of Cx29-lacZ reporter transgenic mice.
- Analysis of lacZ/Cx29 expression in various tissues via X-gal staining.
- Electron microscopy of myelin sheaths in Cx29-deficient mice.
- Assessment of nerve conduction velocity and evoked potentials in Cx29-deficient mice.
Main Results:
- Cx29 expression confirmed in Schwann cells, oligodendrocytes, Bergmann glia, sciatic nerve, spiral ganglion, and adrenal gland chondrocytes.
- No structural abnormalities in myelin sheaths were observed in Cx29-deficient mice.
- Nerve conduction, auditory brainstem response, and visual evoked potentials were normal in Cx29-deficient mice compared to controls.
Conclusions:
- Cx29 is expressed in diverse cell types, including myelinating glia and non-myelinating Schwann cells.
- Despite expression in myelinating cells, Cx29 is not essential for myelin structure or function in adult mice.
- Cx29's role differs from other myelin proteins like connexin32 and connexin47.