Words similar to hypermethylation
Example sentences for: hypermethylation
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Thus in these cases, promoter hypermethylation is one mechanism whereby gene expression can be deregulated in GCTs.
The pattern of such promoter methylation has been noted to be non-random in various tumor types, while certain genes are commonly methylated in diverse tumor types [ 10 11 ] . The extent of aberrant promoter hypermethylation and its association with loss of gene function in cancer suggests that CpG island methylation is an important mechanism in inactivating tumor suppressor genes (TSGs).
The CDH gene exhibited a complete absence of expression in one cell line (SW756) that showed promoter hypermethylation and two other cell lines (C-33A and SiHa) without evidence of methylation (Fig.
Dong and co-workers also previously showed promoter methylation in 51% of CC [ 13 ] . DAPK is a positive mediator of the programmed cell death induced by gamma-interferon [ 21 ] . Loss of DAPK expression has been shown to occur in a number of human malignancies, primarily by promoter hypermethylation [ 11 ] . It has also been shown that loss of DAPK gene expression was associated with aggressive and metastatic phenotype in many tumor types [ 22 ] . In the present study, in addition to showing high frequency of promoter methylation of DAPK gene, we found a complete lack of expression in two of the methylated cell lines and four of 6 unmethylated cell lines.
A unique feature of GCTs is their origin from germ cells at a stage in development where they undergo epigenetic reprogramming [ 6 13 ] . The absence of this epigenetic modification in SGCTs is consistent with their GC-like nature as previously noted [ 6 14 ] . On the other hand, the extensive promoter hypermethylation seen in NSGCTs suggests a mechanistic role in their potential for embryonal and extra-embryonal lineage differentiation [ 6 14 ] . Establishment of DNA methylation in the mammalian genome is controlled by at least three DNA methyltransferases (DNMTs), DNMT1 , DNMT3a and DNMT3b [ 15 ] . The role of these DNMTs in differential de novo methylation in SGCT vs.
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