Publication: Long interspersed nuclear element-1 hypomethylation in cancer: Biology and clinical applications
Issued Date
2011-08-01
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ISSN
18687083
18687075
18687075
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2-s2.0-84856268173
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Mahidol University
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SCOPUS
Bibliographic Citation
Clinical Epigenetics. Vol.2, No.2 (2011), 315-330
Suggested Citation
Nakarin Kitkumthorn, Apiwat Mutirangura Long interspersed nuclear element-1 hypomethylation in cancer: Biology and clinical applications. Clinical Epigenetics. Vol.2, No.2 (2011), 315-330. doi:10.1007/s13148-011-0032-8 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/11494
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Title
Long interspersed nuclear element-1 hypomethylation in cancer: Biology and clinical applications
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Abstract
Epigenetic changes in long interspersed nuclear element-1s (LINE-1s or L1s) occur early during the process of carcinogenesis. A lower methylation level (hypomethylation) of LINE-1 is common in most cancers, and the methylation level is further decreased in more advanced cancers. Consequently, several previous studies have suggested the use of LINE-1 hypomethylation levels in cancer screening, risk assessment, tumor staging, and prognostic prediction. Epigenomic changes are complex, and global hypomethylation influences LINE-1s in a generalized fashion. However, the methylation levels of some loci are dependent on their locations. The consequences of LINE-1 hypomethylation are genomic instability and alteration of gene expression. There are several mechanisms that promote both of these consequences in cis. Therefore, the methylation levels of different sets of LINE-1s may represent certain phenotypes. Furthermore, the methylation levels of specific sets of LINE- 1s may indicate carcinogenesis-dependent hypomethylation. LINE-1 methylation pattern analysis can classify LINE-1s into one of three classes based on the number of methylated CpG dinucleotides. These classes include hypermethylation, partial methylation, and hypomethylation. The number of partial and hypermethylated loci, but not hypomethylated LINE-1s, is different among normal cell types. Consequently, the number of hypomethylated loci is a more promising marker than methylation level in the detection of cancer DNA. Further genome-wide studies to measure the methylation level of each LINE-1 locus may improve PCR-based methylation analysis to allow for a more specific and sensitive detection of cancer DNA or for an analysis of certain cancer phenotypes. © Springer-Verlag 2011.