Hypomethylation of the P3 promoter is associated with up-regulation of IGF2 expression in human osteosarcoma.

Abstract:

:Gene hypomethylation and hypermethylation can lead to a loss of genetic imprinting in malignancies. The mechanism responsible for overexpression of the imprinted insulin-like growth factor II (IGF2) gene has not been investigated in osteosarcoma. In this study, the expression levels, imprinting status, and the extent of cytosine methylation of the IGF2 gene was evaluated in 20 of 24 cases of osteosarcoma using immunohistochemistry, reverse transcriptase polymerase chain reaction, restriction fragment length polymorphism, and bisulfite genomic sequencing. Promoter use analysis indicated that P3- and P4-derived messenger RNAs were more highly expressed than P1 transcripts in the osteosarcoma samples. Loss of imprinting of IGF2 was observed in 3 of 20 of the osteosarcoma samples, but this was not associated with IGF2-specific transcripts. Methylation analysis revealed that the methylation patterns of the differentially methylated region of IGF2 were not uniform, regardless of IGF2-P3 expression. However, the average degree of methylation of the 14 CpG sites in the IGF2-P3 promoter was significantly lower in osteosarcoma samples with P3 transcripts than in osteosarcoma samples without P3 expression (P < .05). This observation was also observed in nontumor samples. These data suggest that hypomethylation of the IGF2-P3 promoter correlates with expression of P3 transcripts in osteosarcoma. Furthermore, elevated IGF2-P3 expression in osteosarcoma tissues is due to P3 promoter hypomethylation, which may represent an early event in progression of osteosarcoma.

journal_name

Hum Pathol

journal_title

Human pathology

authors

Li Y,Meng G,Huang L,Guo QN

doi

10.1016/j.humpath.2009.03.003

subject

Has Abstract

pub_date

2009-10-01 00:00:00

pages

1441-7

issue

10

eissn

0046-8177

issn

1532-8392

pii

S0046-8177(09)00074-4

journal_volume

40

pub_type

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