Hypervariable allelic expression patterns of the imprinted IGF2 gene in tumor cells

LM He, HM Cui, Colum Walsh, R Mattsson, WL Lin, G Anneren, S Pfeifer-Ohlsson, R Ohlsson

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

The IGF2 gene, which encodes a growth factor, is subject to genomic imprinting, The frequently observed loss of IGF2 imprinting in a variety of tumors has been suggested to contribute to neoplasia, Since these reports have not documented the imprinting status of IGF2 at the cellular level, it cannot be excluded that the imprinting status might vary within the tumor, The possibility that loss of IGF2 imprinting in neoplastic cells reflects random imprinting patterns, was therefore addressed, We show here that individual cell populations of the JEG-3 choriocarcinoma cell line display heterogenous imprinting patterns of both IGF2 and H19, In addition, a lack of correlation between IGF2 and H19 imprinting status suggests that any regional parental imprint has been functionally lost, This notion is reinforced by the observation that JEG-3 cell subclones display a range of promoter-specific IGF2 allele usage, Moreover, we observed that the imprinting status of H19 and IGF2 were differentially modulated in JEG-3-derived tumors generated in nude mice, The results suggest that allele-specific expression of IGF2 operates in the absence of a parental imprint, Finally, our observations urge caution with respect to the general interpretation of biallelic expression as `loss of imprinting'.
LanguageEnglish
Pages113-119
JournalOncogene
Volume16
Issue number1
DOIs
Publication statusPublished - Jan 1998

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Genes
Neoplasms
Alleles
Genomic Imprinting
Choriocarcinoma
Nude Mice
Intercellular Signaling Peptides and Proteins
Cell Line
Population

Cite this

He, LM., Cui, HM., Walsh, C., Mattsson, R., Lin, WL., Anneren, G., ... Ohlsson, R. (1998). Hypervariable allelic expression patterns of the imprinted IGF2 gene in tumor cells. Oncogene, 16(1), 113-119. https://doi.org/10.1038/sj.onc.1201501
He, LM ; Cui, HM ; Walsh, Colum ; Mattsson, R ; Lin, WL ; Anneren, G ; Pfeifer-Ohlsson, S ; Ohlsson, R. / Hypervariable allelic expression patterns of the imprinted IGF2 gene in tumor cells. In: Oncogene. 1998 ; Vol. 16, No. 1. pp. 113-119.
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He, LM, Cui, HM, Walsh, C, Mattsson, R, Lin, WL, Anneren, G, Pfeifer-Ohlsson, S & Ohlsson, R 1998, 'Hypervariable allelic expression patterns of the imprinted IGF2 gene in tumor cells', Oncogene, vol. 16, no. 1, pp. 113-119. https://doi.org/10.1038/sj.onc.1201501

Hypervariable allelic expression patterns of the imprinted IGF2 gene in tumor cells. / He, LM; Cui, HM; Walsh, Colum; Mattsson, R; Lin, WL; Anneren, G; Pfeifer-Ohlsson, S; Ohlsson, R.

In: Oncogene, Vol. 16, No. 1, 01.1998, p. 113-119.

Research output: Contribution to journalArticle

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AU - He, LM

AU - Cui, HM

AU - Walsh, Colum

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AB - The IGF2 gene, which encodes a growth factor, is subject to genomic imprinting, The frequently observed loss of IGF2 imprinting in a variety of tumors has been suggested to contribute to neoplasia, Since these reports have not documented the imprinting status of IGF2 at the cellular level, it cannot be excluded that the imprinting status might vary within the tumor, The possibility that loss of IGF2 imprinting in neoplastic cells reflects random imprinting patterns, was therefore addressed, We show here that individual cell populations of the JEG-3 choriocarcinoma cell line display heterogenous imprinting patterns of both IGF2 and H19, In addition, a lack of correlation between IGF2 and H19 imprinting status suggests that any regional parental imprint has been functionally lost, This notion is reinforced by the observation that JEG-3 cell subclones display a range of promoter-specific IGF2 allele usage, Moreover, we observed that the imprinting status of H19 and IGF2 were differentially modulated in JEG-3-derived tumors generated in nude mice, The results suggest that allele-specific expression of IGF2 operates in the absence of a parental imprint, Finally, our observations urge caution with respect to the general interpretation of biallelic expression as `loss of imprinting'.

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