Global analysis of chromosome X gene expression in primary cultures of normal ovarian surface epithelial cells and epithelial ovarian cancer cell lines

  • Authors:
    • Marie-Hélène Benoît
    • Thomas J. Hudson
    • Georges Maire
    • Jeremy A. Squire
    • Suzanna L. Arcand
    • Diane Provencher
    • Anne-Marie Mes-Masson
    • Patricia N. Tonin
  • View Affiliations

  • Published online on: January 1, 2007     https://doi.org/10.3892/ijo.30.1.5
  • Pages: 5-17
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Abstract

The interpretation of loss of heterozygosity (LOH) in cancers is complicated as genes that map to LOH regions may be transcriptionally active (Xa) or inactive (Xi) due to X chromosome inactivation (XCI). We have analyzed the chromosome X transcriptome in four epithelial ovarian cancer (EOC) cell lines (TOV21G, TOV81D, TOV112D, and OV90) and 12 primary cultures of normal ovarian surface epithelial (NOSE) cells in relation to chromosome X integrity. Two-way comparative analysis using HuGeneFL Affymetrix GeneChips® of TOV21G, TOV81D and OV90 relative to the NOSE samples was highly correlated (>89%) in contrast to that of TOV112D (56-69%). TOV112D, followed by TOV21G, exhibited the largest number of up-regulated genes. XIST expression by RT-PCR was not detectable in TOV112D or TOV21G. Allele-specific transcription by cDNA sequence analysis of genes known to be subjected to XCI revealed maintenance of XCI in TOV81D and OV90, but not TOV21G. Biallelic expression could not be assessed in TOV112D due to reduction to hemizygosity of chromosome X. Chromosome X rearrangements were observed in FISH analysis of TOV112D and TOV21G, and both of these EOC cell lines were negative for Barr body analysis. The differentially expressed genes did not appear to map to any particular region of the X chromosome in any EOC cell line. The absence of XIST expression is consistent with Barr body loss in TOV112D and TOV21G. The combined evidence is consistent with two proposed mechanisms to account for absence of Xi in female cancers: Xi loss followed by Xa duplication (exemplified by TOV112D) and transcriptional reactivation of Xi (exemplified by TOV21G). Despite an alteration in XIST expression and differences in allelic content in the EOC cell lines, the chromosome X transcriptome was modified modestly when compared with that of NOSE samples.

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January 2007
Volume 30 Issue 1

Print ISSN: 1019-6439
Online ISSN:1791-2423

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Spandidos Publications style
Benoît M, Hudson TJ, Maire G, Squire JA, Arcand SL, Provencher D, Mes-Masson A and Tonin PN: Global analysis of chromosome X gene expression in primary cultures of normal ovarian surface epithelial cells and epithelial ovarian cancer cell lines. Int J Oncol 30: 5-17, 2007.
APA
Benoît, M., Hudson, T.J., Maire, G., Squire, J.A., Arcand, S.L., Provencher, D. ... Tonin, P.N. (2007). Global analysis of chromosome X gene expression in primary cultures of normal ovarian surface epithelial cells and epithelial ovarian cancer cell lines. International Journal of Oncology, 30, 5-17. https://doi.org/10.3892/ijo.30.1.5
MLA
Benoît, M., Hudson, T. J., Maire, G., Squire, J. A., Arcand, S. L., Provencher, D., Mes-Masson, A., Tonin, P. N."Global analysis of chromosome X gene expression in primary cultures of normal ovarian surface epithelial cells and epithelial ovarian cancer cell lines". International Journal of Oncology 30.1 (2007): 5-17.
Chicago
Benoît, M., Hudson, T. J., Maire, G., Squire, J. A., Arcand, S. L., Provencher, D., Mes-Masson, A., Tonin, P. N."Global analysis of chromosome X gene expression in primary cultures of normal ovarian surface epithelial cells and epithelial ovarian cancer cell lines". International Journal of Oncology 30, no. 1 (2007): 5-17. https://doi.org/10.3892/ijo.30.1.5