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Impaired adult neurogenesis in mice lacking the transcription factor E2F1
Christiana M Cooper-Kuhn1, Maurice Vroemen, Jason Brown
1Department of Neurology, University of Regensburg, D-93053 Regensburg, Germany.
Abstract:
During nervous system development the fate of neural stem cells-whether to undergo proliferation, differentiation, or apoptosis-is controlled by various signals, such as growth factors. Here, we demonstrate that the transcription factor E2F1, which is targeted by several signaling cascades that are activated by growth factors, is involved in neurogenesis in the adult brain. When analyzing the brains of E2F1-deficient mice, we found significantly decreased stem cell and progenitor division in the proliferative zones of the lateral ventricle wall and the hippocampus. As a consequence, the production of newborn neurons in the adult olfactory bulb and dentate gyrus was decreased. Neuronal cell counts of the adult cerebellum revealed a mild but significant cerebellar atrophy, whereas neocortical neurons were unaffected, suggesting that E2F1 deficiency produces a predominantly postnatal phenotype. The results indicate an involvement of E2F1 in controlling proliferation and neuronal cell numbers in the postnatal and adult brain.
Insights
The transcription factor E2F1 is crucial for adult neurogenesis. E2F1 deficiency in mice reduces neural stem cell division, impacting newborn neuron production and causing cerebellar atrophy.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Neural stem cell fate is regulated by growth factors and signaling cascades.
- Transcription factors play a key role in controlling cell proliferation and differentiation.
Purpose of the Study:
- To investigate the role of transcription factor E2F1 in adult neurogenesis.
- To determine the impact of E2F1 deficiency on neural stem cell behavior and neuronal production in the adult brain.
Main Methods:
- Analysis of E2F1-deficient mice brains.
- Assessment of stem cell and progenitor division in specific brain regions (lateral ventricle wall, hippocampus).
- Quantification of newborn neuron production in the olfactory bulb and dentate gyrus.
- Evaluation of neuronal cell counts in the cerebellum and neocortex.
Main Results:
- E2F1-deficient mice exhibited significantly decreased stem cell and progenitor division.
- Reduced production of newborn neurons was observed in the adult olfactory bulb and dentate gyrus.
- Mild but significant cerebellar atrophy was noted, while neocortical neurons remained unaffected.
Conclusions:
- Transcription factor E2F1 is involved in controlling proliferation and neuronal cell numbers in the postnatal and adult brain.
- E2F1 deficiency leads to a predominantly postnatal phenotype affecting neurogenesis.