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Methylation Profiling of Specific Genes in Ependymomas. | LitMetric

AI Article Synopsis

  • The study investigates the relationship between DNA methylation and various clinical features in ependymomas, a type of brain tumor.
  • Analyzed genes included CDKN2A, RASSF1A, KLF4, and ZIC2 in 44 tumor samples, revealing significant hypermethylation of ZIC2 in adult spinal ependymomas and RASSF1A in high-grade tumors.
  • The findings suggest that changes in DNA methylation, particularly of ZIC2 and RASSF1A, could be important for understanding the biology of ependymomas and may aid in their classification.

Article Abstract

Objective: Ependymomas are neuroepithelial tumors of the central nervous system with heterogeneous biology and clinical course. The aim of the present study is to investigate the relationship between the methylation status and clinicopathological parameters in ependymomas.

Material And Method: DNA methylation status of CDKN2A, RASSF1A, KLF4 and ZIC2 genes were quantitatively analyzed with pyrosequencing in 44 ependymoma tumor tissues. The relationship of methylation profiles with tumor subtype, histological grade and patient age was statistically analyzed.

Results: DNA methylation analyses for CDKN2A revealed no difference in methylation levels. Of the 31 included samples for optimal ZIC2 methylation analysis, 10 were hypermethylated (32.3%) and this change was significantly found in the adult spinal ependymomas (p=0.01). KLF4 hypermethylation was observed in 6 of the overall included 35 samples (17.1%); however, there was no statistically significant relation of the methylation status with tumor subtype, histological grade or age group. RASSF1A hypermethylation was observed in overall 40 included samples with varying methylation levels. Higher levels of hypermethylation were significantly related to the grade 3 histology (p=0.01) and spinal ependymomas (p=0.006). The pediatric cases with grade 3 ependymomas and ependymomas of adulthood showed significantly increased RASSF1A hypermethylation levels (p < 0.001 and p=0.001, respectively).

Conclusion: DNA methylation changes are likely to have biological importance in ependymomas. Both ZIC2 and RASSF1A methylation status may be useful parameters in the subclassification of these tumors.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10508420PMC
http://dx.doi.org/10.5146/tjpath.2021.01565DOI Listing

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