By Professor Dr. Davide Schiffer, Professor Dr. Maria Teresa Giordana, Dr. Alessandro Mauro, Dr. Riccardo Soffietti (auth.)

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Extra info for Brain Tumors: Biology, Pathology and Clinical References

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Moreover, brain tumors preferentially express type II isoform, whereas type I is the predominant isoform in normal adult brain [3347]. A second epigenetic mechanism potentially involved in regulation of NFl expression is RNA editing, a post-transcriptional site-specific modification of mRNA. 1 Genetics and Molecular Biology 21 moral tissues than in cells from normal individuals [2250]. The modification induced by mRNA editing at position 2914 may be functionally important involving the protein domain essential for interaction with ras [2250].

In patients harboring defective VHL genes, elongin is not negatively regulated by the VHL gene product, resulting in excessive elongation of transcription and a high transcript level of as yet unidentified target genes [1790]. This mechanism may be extremely important, as the regulation of several oncogenes, including c-myc, is exerted at the level of transcript elongation [1790]. Mutations of the p53 tumor suppressor gene are the most frequent genetic abnormalities in human cancer; in about half of all cancer cases, the two p53 alleles are mutated or deleted [1376, 1932].

H&E, x200 cessary in drawing conclusions [3335]. Furthermore, the difficulty in demonstrating mitoses, which are very sensitive to anoxia [457] and require particular fixation techniques for visualization, has to be taken into account. The fundamental fact remains that in the adult, outside the subependymallayer, mitoses are very rare [3333]. Evidence has been obtained by labeling cells using retroviral injection that immature, dividing cells remain in the adult white matter, do not express differentiation antigens, and do not migrate [1123].

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