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Title 

Biallelic expression of the H19 and IGF2 genes in hepatocellular carcinoma

Authors 

Kyoung-Sook KimYoung Ik Lee

Publisher 

Elsevier

Issue Date 

1997

Citation 

Cancer Letters, vol. 119, no. 0, pp. 143-148

Keywords 

Insulin-like growth factor II (IGF2)H19 geneLoss of imprinting (LOI)Hepatocellular carcinoma (HCC)Hep3B

Abstract 

The imprinted genes, H19 and insulin-like growth factor II (IGF2), have been demonstrated to be necessary for embryonal development in humans. Both genes are reciprocally imprinted, with expression of the maternal H19 and paternal IGF2 alleles, and are normally characterized by monoallelic expression. Recently, loss of imprinting of these genes producing biallelic expression has been observed in childhood tumors including Wilms' tumors (WT), embryonal rhabdomyosarcoma, and adulthood tumors such as lung cancer. To test the existence of loss of imprinting in hepatocellular carcinoma (HCC), we analyzed the status of imprinting of H19 and IGF2 genes in three independent tumors, three HCC and one hepatoblastoma cell lines using AluI and ApaI polymorphisms of these genes, respectively. In contrast to the previous report, all the cases except one tumor and one HCC cell line showed biallelic expression of both H19 and IGF2 genes. Unlike WT, loss of imprinting (LOI) of IGF2 in HCC was not linked to down-regulation of H19 expression, but rather associated with coexpression for H19 and IGF2. Thus, H19 and IGF2 expression can be uncoupled in tumors with LOI. The frequent biallelic expression of H19 and IGF2 in hepatocellular carcinoma might play a causal role in the epigenetic mechanism involved in tumor development and/or process.

ISSN 

0304-3835

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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