PLoS Genetics (Apr 2013)

Epigenetic upregulation of lncRNAs at 13q14.3 in leukemia is linked to the In Cis downregulation of a gene cluster that targets NF-kB.

  • Angela Garding,
  • Nupur Bhattacharya,
  • Rainer Claus,
  • Melanie Ruppel,
  • Cordula Tschuch,
  • Katharina Filarsky,
  • Irina Idler,
  • Manuela Zucknick,
  • Maïwen Caudron-Herger,
  • Christopher Oakes,
  • Verena Fleig,
  • Ioanna Keklikoglou,
  • Danilo Allegra,
  • Leticia Serra,
  • Sudhir Thakurela,
  • Vijay Tiwari,
  • Dieter Weichenhan,
  • Axel Benner,
  • Bernhard Radlwimmer,
  • Hanswalter Zentgraf,
  • Stefan Wiemann,
  • Karsten Rippe,
  • Christoph Plass,
  • Hartmut Döhner,
  • Peter Lichter,
  • Stephan Stilgenbauer,
  • Daniel Mertens

DOI
https://doi.org/10.1371/journal.pgen.1003373
Journal volume & issue
Vol. 9, no. 4
p. e1003373

Abstract

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Non-coding RNAs are much more common than previously thought. However, for the vast majority of non-coding RNAs, the cellular function remains enigmatic. The two long non-coding RNA (lncRNA) genes DLEU1 and DLEU2 map to a critical region at chromosomal band 13q14.3 that is recurrently deleted in solid tumors and hematopoietic malignancies like chronic lymphocytic leukemia (CLL). While no point mutations have been found in the protein coding candidate genes at 13q14.3, they are deregulated in malignant cells, suggesting an epigenetic tumor suppressor mechanism. We therefore characterized the epigenetic makeup of 13q14.3 in CLL cells and found histone modifications by chromatin-immunoprecipitation (ChIP) that are associated with activated transcription and significant DNA-demethylation at the transcriptional start sites of DLEU1 and DLEU2 using 5 different semi-quantitative and quantitative methods (aPRIMES, BioCOBRA, MCIp, MassARRAY, and bisulfite sequencing). These epigenetic aberrations were correlated with transcriptional deregulation of the neighboring candidate tumor suppressor genes, suggesting a coregulation in cis of this gene cluster. We found that the 13q14.3 genes in addition to their previously known functions regulate NF-kB activity, which we could show after overexpression, siRNA-mediated knockdown, and dominant-negative mutant genes by using Western blots with previously undescribed antibodies, by a customized ELISA as well as by reporter assays. In addition, we performed an unbiased screen of 810 human miRNAs and identified the miR-15/16 family of genes at 13q14.3 as the strongest inducers of NF-kB activity. In summary, the tumor suppressor mechanism at 13q14.3 is a cluster of genes controlled by two lncRNA genes that are regulated by DNA-methylation and histone modifications and whose members all regulate NF-kB. Therefore, the tumor suppressor mechanism in 13q14.3 underlines the role both of epigenetic aberrations and of lncRNA genes in human tumorigenesis and is an example of colocalization of a functionally related gene cluster.