Long Interspersed Nuclear Element 1 Retrotransposons Become Deregulated during the Development of Ovarian Cancer Precursor Lesions

Thomas R. Pisanic, Shiho Asaka, Shiou Fu Lin, Ting Tai Yen, Hanru Sun, Asli Bahadirli-Talbott, Tza Huei Wang, Kathleen H. Burns, Tian Li Wang, Ie Ming Shih

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

There is growing evidence that most high-grade serous ovarian carcinomas likely arise from local dissemination of precursor lesions of the fallopian tube. Evolution of these lesions from early p53 signatures to latter-stage, serous tubal intraepithelial carcinomas (STICs) is characterized by cytologic atypia, accumulation of somatic mutations, and genomic instability, the etiologies of which remain unclear. Long interspersed element 1 (LINE-1) retrotransposon is expressed in many carcinomas, including high-grade serous ovarian carcinoma, where it contributes to genomic instability; however, the timing of LINE-1 activation during this evolution has yet to be elucidated. In this study, we assessed LINE-1 open reading frame 1 protein expression in 12 p53 signature lesions, 32 STICs, and 112 various types of ovarian cancers via immunohistochemical staining and examined LINE-1 promoter methylation in representative cases. We found that 78% and 57% of STICs, with and without concurrent ovarian carcinomas, respectively, exhibited intense LINE-1 immunoreactivity compared with adjacent, normal-appearing fallopian tube epithelium. Hypomethylation of the LINE-1 promoter was found in all STICs exhibiting overexpression. None of the 12 p53 signatures demonstrated significant LINE-1 expression. In ovarian cancer, 84 (75%) of 112 ovarian carcinomas overexpressed LINE-1. Our results indicate that LINE-1 retrotransposons often become deregulated during progression of ovarian cancer precursor lesions from the p53 signature to STIC stages and remain highly expressed in carcinoma.

Original languageEnglish
Pages (from-to)513-520
Number of pages8
JournalAmerican Journal of Pathology
Volume189
Issue number3
DOIs
Publication statusPublished - Mar 2019
Externally publishedYes

ASJC Scopus subject areas

  • Pathology and Forensic Medicine

Fingerprint Dive into the research topics of 'Long Interspersed Nuclear Element 1 Retrotransposons Become Deregulated during the Development of Ovarian Cancer Precursor Lesions'. Together they form a unique fingerprint.

  • Cite this

    Pisanic, T. R., Asaka, S., Lin, S. F., Yen, T. T., Sun, H., Bahadirli-Talbott, A., Wang, T. H., Burns, K. H., Wang, T. L., & Shih, I. M. (2019). Long Interspersed Nuclear Element 1 Retrotransposons Become Deregulated during the Development of Ovarian Cancer Precursor Lesions. American Journal of Pathology, 189(3), 513-520. https://doi.org/10.1016/j.ajpath.2018.11.005