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Expression of glia maturation factor beta mRNA and protein in rat organs and cells
1Department of Neurology, Division of Neurochemistry and Neurobiology, University of Iowa College of Medicine, Iowa City 52242.
Abstract:
Rat glia maturation factor beta (GMF-beta) cDNA was obtained by reverse transcription of rat brain mRNA followed by polymerase chain reaction amplification, using primers from the human sequence. The deduced amino acid sequence of rat GMF-beta differed from the human counterpart in only three places: His27 in place of Asn, Val51 in place of Ile, and Leu93 in place of Val. The high degree of evolutionary conservation suggests that GMF-beta plays an essential role in animal cell physiology. The expression of GMF-beta mRNA in the rat was studied by the northern blot technique, using a rat cRNA probe corresponding to the entire coding region. GMF-beta mRNA was predominantly expressed in the brain and spinal cord, although trace levels were found in other organs, including testis and ovary. In the brain GMF-beta mRNA was detectable at as early as embryonic day 10, and persisted through as late as postnatal month 14, with minor variations in between. On the other hand, GMF-beta protein exhibited more obvious developmental changes, with its level increasing slowly prenatally and plateauing at 1 week after birth. GMF-beta mRNA and protein were also observed in several cultured cells. Some cells of neural origin contained higher levels of GMF-beta protein compared with cells derived from other sources. Through demonstration of mRNA and confirmation by immunoblotting, we conclude that GMF-beta is synthesized by rat organs and that GMF-beta is predominantly a brain protein.
Insights
Rat glia maturation factor beta (GMF-beta) is primarily synthesized in the brain and spinal cord. This essential protein shows significant evolutionary conservation and developmental expression in neural tissues.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Glia maturation factor beta (GMF-beta) is a protein with a conserved sequence across species.
- Understanding its expression patterns is crucial for comprehending its physiological role.
Purpose of the Study:
- To characterize the expression profile of rat GMF-beta mRNA and protein.
- To investigate the developmental and tissue-specific distribution of GMF-beta.
Main Methods:
- Rat GMF-beta cDNA was synthesized using reverse transcription and PCR.
- Northern blot analysis was employed to detect GMF-beta mRNA expression.
- Immunoblotting was used to confirm GMF-beta protein presence.
Main Results:
- Rat GMF-beta sequence shows high similarity to human GMF-beta, with only three amino acid differences.
- GMF-beta mRNA is predominantly expressed in the brain and spinal cord, with lower levels in other tissues like testis and ovary.
- GMF-beta protein levels increase postnatally, peaking around one week after birth, and are higher in neural-derived cultured cells.
Conclusions:
- GMF-beta is synthesized in various rat organs, with a notable predominance in the brain.
- The conserved nature and specific expression patterns suggest a vital role for GMF-beta in neural function.