The Noncoding RNA MALAT1 Is a Critical Regulator of the Metastasis Phenotype of Lung Cancer Cells
Tony Gutschner,Monika Hämmerle,Moritz Eißmann,Jeff Hsu,Youngsoo Kim,Gene Hung,Alexey S. Revenko,Gayatri Arun,Marion Stentrup,Matthias Groß,Martin Zörnig,A. Robert MacLeod,David L. Spector,Sven Diederichs +13 more
TLDR
A loss-of-function model unravels the active function of MALAT1 as a regulator of gene expression governing hallmarks of lung cancer metastasis with this ncRNA serving as both predictive marker and therapeutic target.Abstract:
The long non-coding RNA MALAT1, also known as MALAT-1 or NEAT2, is a highly conserved nuclear ncRNA and a predictive marker for metastasis development in lung cancer. To uncover its functional importance, we developed a MALAT1 knockout model in human lung tumor cells by genomically integrating RNA destabilizing elements using Zinc Finger Nucleases. The achieved 1000-fold MALAT1 silencing provides a unique loss-of-function model. Proposed mechanisms of action include regulation of splicing or gene expression. In lung cancer, MALAT1 does not alter alternative splicing but actively regulates gene expression including a set of metastasis-associated genes. Consequently, MALAT1-deficient cells are impaired in migration and form fewer tumor nodules in a mouse xenograft. Antisense oligonucleotides blocking MALAT1 prevent metastasis formation after tumor implantation. Thus, targeting MALAT1 with antisense oligonucleotides provides a potential therapeutic approach to prevent lung cancer metastasis with MALAT1 serving as both, predictive marker and therapeutic target. Lastly, regulating gene expression, but not alternative splicing is the critical function of MALAT1 in lung cancer metastasis. In summary, ten years after the discovery of the lncRNA MALAT1 as a biomarker for lung cancer metastasis, our loss-of-function model unravels the active function of MALAT1 as a regulator of gene expression governing hallmarks of lung cancer metastasis.read more
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Association of Long Non-Coding RNA Polymorphisms with Gastric Cancer and Atrophic Gastritis.
Vytenis Petkevicius,Greta Streleckiene,Kotryna Balciute,Alexander Link,Marcis Leja,Peter Malfertheiner,Jurgita Skieceviciene,Juozas Kupcinskas +7 more
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TL;DR: Three potentially functional classes of RNAs have been identified, two of which are syntenically conserved and correlate with the expression state of protein-coding genes and support a highly interleaved organization of the human transcriptome.
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