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Int. J. Mol. Sci. 2013, 14(2), 4298-4316; doi:10.3390/ijms14024298

The Increasing Complexity of the Oncofetal H19 Gene Locus: Functional Dissection and Therapeutic Intervention

Department of Biological Chemistry, Institute of Life Sciences, the Hebrew University of Jerusalem, Jerusalem 91904, Israel
Department of Biological Sciences, Faculty of Science and Technology, Al-Quds University, Jerusalem 51000, Israel
Department of HPB Surgery "A", Sheba Medical Center, Tel Hashomer, Tel Aviv 52621, Israel
Author to whom correspondence should be addressed.
Received: 3 December 2012 / Revised: 29 January 2013 / Accepted: 6 February 2013 / Published: 21 February 2013
(This article belongs to the Special Issue Non-Coding RNAs 2012)
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The field of the long non-coding RNA (lncRNA) is advancing rapidly. Currently, it is one of the most popular fields in the biological and medical sciences. It is becoming increasingly obvious that the majority of the human transcriptome has little or no-protein coding capacity. Historically, H19 was the first imprinted non-coding RNA (ncRNA) transcript identified, and the H19/IGF2 locus has served as a paradigm for the study of genomic imprinting since its discovery. In recent years, we have extensively investigated the expression of the H19 gene in a number of human cancers and explored the role of H19 RNA in tumor development. Here, we discuss recently published data from our group and others that provide further support for a central role of H19 RNA in the process of tumorigenesis. Furthermore, we focus on major transcriptional modulators of the H19 gene and discuss them in the context of the tumor-promoting activity of the H19 RNA. Based on the pivotal role of the H19 gene in human cancers, we have developed a DNA-based therapeutic approach for the treatment of cancers that have upregulated levels of H19 expression. This approach uses a diphtheria toxin A (DTA) protein expressed under the regulation of the H19 promoter to treat tumors with significant expression of H19 RNA. In this review, we discuss the treatment of four cancer indications in human subjects using this approach, which is currently under development. This represents perhaps one of the very few examples of an existing DNA-based therapy centered on an lncRNA system. Apart from cancer, H19 expression has been reported also in other conditions, syndromes and diseases, where deregulated imprinting at the H19 locus was obvious in some cases and will be summarized below. Moreover, the H19 locus proved to be much more complicated than initially thought. It houses a genomic sequence that can transcribe, yielding various transcriptional outputs, both in sense and antisense directions. The major transcriptional outputs of the H19 locus are presented here. View Full-Text
Keywords: long non-coding RNA; transcriptional modulators; DNA-based therapy; diphtheria toxin A; sense and antisense transcripts long non-coding RNA; transcriptional modulators; DNA-based therapy; diphtheria toxin A; sense and antisense transcripts
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Matouk, I.; Raveh, E.; Ohana, P.; Lail, R.A.; Gershtain, E.; Gilon, M.; De Groot, N.; Czerniak, A.; Hochberg, A. The Increasing Complexity of the Oncofetal H19 Gene Locus: Functional Dissection and Therapeutic Intervention. Int. J. Mol. Sci. 2013, 14, 4298-4316.

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