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[The expression of oncogenes in the development of human brain]
Abstract:
Seven oncogenes (c-myc, L-myc, N-myc, v-erbB, c-fos, Ha-ras and mos) were used as the probe to detect the total RNA of every part (cerebellum, temporal folium, frontal folium and occipital folium) in human brain from 2 cases of 6 mon fetus and the total RNA in fetal development (4 mon, 5 mon, 6 mon, 7 mon, and newborn) of human brain tissue by RNA dot hybridization analysis. The results showed that most oncogenes were expressed at high level in cerebellum and occipital folium of 6 mon fetus and at low level in temporal folium; there was similar expression of c-myc, L-myc and N-myc in fetal development of human brain tissue, and the highest level was in the 5 mon fetal brain. There was no expression of erbB gene in normal human brain. The high level expression of Ha-ras and c-fos genes was in the middle and later stages of fetal development. These results suggested that c-myc, L-myc, N-myc, erbB, Ha-ras, c-fos and mos genes might play an important role in the fetal development of human brain.
Insights
Oncogene expression in fetal human brain development reveals key roles for c-myc, L-myc, N-myc, Ha-ras, and c-fos genes, particularly in the cerebellum and occipital regions during mid-fetal stages.
Area of Science:
- Molecular Biology
- Neuroscience
- Developmental Biology
Context:
- Oncogene expression patterns are crucial for understanding normal cellular processes, including development.
- The human brain undergoes complex developmental stages with distinct molecular signaling pathways.
Purpose:
- To investigate the expression levels of seven key oncogenes (c-myc, L-myc, N-myc, v-erbB, c-fos, Ha-ras, and mos) in various regions of the developing human fetal brain.
- To correlate oncogene expression with specific developmental time points and brain structures.
Summary:
- RNA dot hybridization analysis was performed on human fetal brain tissue from 4 to 7 months gestation and newborns, as well as specific brain regions (cerebellum, temporal, frontal, and occipital lobes) of 6-month fetuses.
- Most oncogenes showed high expression in the cerebellum and occipital lobe of 6-month fetuses, with lower levels in the temporal lobe.
- c-myc, L-myc, and N-myc exhibited similar expression patterns throughout fetal development, peaking at 5 months.
- v-erbB showed no expression in normal human brain tissue.
- Ha-ras and c-fos were highly expressed during the middle and later stages of fetal brain development.
Impact:
- The findings suggest that specific oncogenes, including c-myc, L-myc, N-myc, Ha-ras, and c-fos, play significant roles in human fetal brain development.
- Understanding these oncogene roles can provide insights into neurodevelopmental processes and potential abnormalities.