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Updated: Mar 12, 2026
10:58
Transposon Mediated Integration of Plasmid DNA into the Subventricular Zone of Neonatal Mice to Generate Novel Models of Glioblastoma
Published on: February 22, 2015
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Somatic retrotransposition is infrequent in glioblastomas
Pragathi Achanta1, Jared P Steranka2,3, Zuojian Tang4,5
1Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD USA.
Mobile DNA
|November 16, 2016
Summary
Long INterspersed Element-1 (LINE-1) retrotransposons infrequently cause mutations in secondary glioblastomas (GBM). Retrotransposition is rare in these brain tumors compared to others.
Area of Science:
- Neuro-oncology
- Genomics
- Molecular Biology
Background:
- Gliomas are the most common adult primary brain tumors.
- Understanding the role of transposable elements in gliomas is crucial.
- Somatic retrotransposition in glioblastomas (GBM) requires further investigation.
Purpose of the Study:
- To identify evidence of somatic retrotransposition of Long INterspersed Element-1 (LINE-1) in GBM.
- To investigate the role of LINE-1 as an insertional mutagen in brain tumors.
Main Methods:
- Transposon insertion profiling of LINE-1 elements using deep sequencing (TIPseq).
- Analysis of genomic DNA from primary GBM oncosphere cell lines, secondary GBM tissues, and matched normal blood samples.
- Polymerase chain reaction (PCR) validation and SNP 6.0 microarray analysis.
Main Results:
- One somatically acquired, tumor-specific LINE-1 insertion was identified and PCR-validated in a secondary GBM case.
- No LINE-1 insertions were lost in primary GBM cultures compared to blood.
- Tumor genomes showed deletions or loss of heterozygosity at LINE-1 insertion sites.
Conclusions:
- LINE-1 retrotransposons can act as infrequent insertional mutagens in secondary GBM.
- Retrotransposition is uncommon in central nervous system tumors like GBM compared to other cancers.
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