Hypomethylated and hypermethylated profiles of H19DMR are associated with the aberrant imprinting of IGF2 and H19 in human hepatocellular carcinoma

Genomics. 2008 May;91(5):443-50. doi: 10.1016/j.ygeno.2008.01.007. Epub 2008 Mar 20.

Abstract

In this study, 39 human hepatocellular carcinoma (HCC) tissues and 7 normal adult liver tissues were screened for heterozygous polymorphisms in IGF2, H19, and the differentially methylated region of H19 (H19DMR) using PCR-RFLP and PCR sequencing. The imprinting of IGF2 and H19 was examined by RT-PCR-RFLP, while the methylation profile of H19DMR was detected by bisulfite sequencing from every informative sample. Of the informative HCC samples 47.06% (8 of 17) demonstrated a gain of imprinting of IGF2, and 21.74% (5 of 23) of the informative HCC samples demonstrated a loss of imprinting of H19. Interestingly, we found three methylation profiles for H19DMR in the informative HCC samples: hyper-, medium-, and hypomethylated profiles. Furthermore, the hypomethylated and hypermethylated profiles were immediately associated with aberrant imprinting of IGF2 and H19.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alleles
  • Carcinoma, Hepatocellular / genetics*
  • CpG Islands
  • DNA Methylation*
  • Genomic Imprinting*
  • Humans
  • Insulin-Like Growth Factor II / genetics*
  • Liver / metabolism
  • Liver Neoplasms / genetics*
  • RNA, Long Noncoding
  • RNA, Untranslated / genetics*

Substances

  • H19 long non-coding RNA
  • IGF2 protein, human
  • RNA, Long Noncoding
  • RNA, Untranslated
  • Insulin-Like Growth Factor II