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Expression of the transcription factor regulatory factor X1 in the mouse brain
Chenzhuo Feng1, Jiejie Li, Zhiyi Zuo
1Department of Anesthesiology, University of Virginia, Charlottesville, Virginia, USA.
Abstract:
Limited information indicates that the regulatory factor X1 (RFX1), the prototype member of the transcription factor RFX family, may play a role in the central nervous system. Our recent study showed that knockout of the Rfx1 gene led to early embryonic death. In the present study, we showed that heterozygous Rfx1(+/-) mice were fertile and grew normally. An abundant amount of RFX1 proteins were expressed in the olfactory bulb, hippocampus and cerebral cortex as detected by β-galactosidase staining (the gene knockout vector contained a coding region for β-galactosidase) and immunofluorescent staining with an anti-RFX1 antibody. RFX1 positive immunostaining was mainly in the nuclei of neurons and microglial cells and was absent from the astrocytes of mouse brains. The heterozygous Rfx1(+/-) mice expressed RFX1 mRNA and proteins at a level similar to that in the wild-type mice in the olfactory bulb and hippocampus. The expression level of RFX1 proteins was similar in the brains of mice ranging from 15 day old embryos to four month old adults. Our results suggest a significant expression of RFX1 proteins in the mammalian brain. This expression is cell-type and brain-region specific and may take a random monoallelic expression pattern.
Insights
Regulatory factor X1 (RFX1) is significantly expressed in the mammalian brain, particularly in neurons and microglial cells. This finding suggests RFX1 plays a crucial role in central nervous system development and function.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- The role of Regulatory Factor X1 (RFX1) in the central nervous system (CNS) is not well understood.
- Previous studies indicated that Rfx1 gene knockout results in early embryonic lethality.
Purpose of the Study:
- To investigate the expression pattern and localization of RFX1 protein in the adult mammalian brain.
- To determine the potential role of RFX1 in CNS development and function.
Main Methods:
- Utilized heterozygous Rfx1(+/-) mice for experiments.
- Employed β-galactosidase staining and immunofluorescent staining with an anti-RFX1 antibody to detect RFX1 protein expression.
- Analyzed RFX1 mRNA and protein levels in various brain regions and developmental stages.
Main Results:
- Heterozygous Rfx1(+/-) mice are fertile and develop normally.
- RFX1 protein is abundantly expressed in the olfactory bulb, hippocampus, and cerebral cortex of mouse brains.
- RFX1 is localized in the nuclei of neurons and microglial cells, but not astrocytes.
- RFX1 expression is consistent across different developmental stages (embryonic to adult) and similar between heterozygous and wild-type mice in specific brain regions.
- Expression of RFX1 is cell-type and brain-region specific, potentially exhibiting monoallelic expression.
Conclusions:
- RFX1 protein is significantly expressed in the mammalian brain, indicating a potential role in CNS function.
- The cell-type and brain-region specific expression suggests a targeted function of RFX1 within the nervous system.
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