title: ZNF300P1 encodes a lincRNA that regulates cell polarity and is epigenetically silenced in type II epithelial ovarian cancer.
abstract: BACKGROUND
  We previously identified that the CpG island-associated promoter of the novel lincRNA ZNF300P1 (also known as LOC134466) is frequently hypermethylated and silenced in ovarian cancer tissues. However, the function of ZNF300P1 was unknown. In this report we demonstrate that ZNF300P1 is involved in the regulation of key cell cycle and cell motility networks in human ovarian surface epithelial cells, and may play a role in promoting metastasis in ovarian cancer cells.
  
  
  METHODS
  We applied methylated DNA immunoprecipitation on whole genome promoter tiling arrays and Sequenom assays to examine methylation status of ZNF300P1 in multiple ovarian cancer cell lines, as well as in normal ovarian and ovarian tumor tissues. Transcript profiling was used to investigate the effects of ZNF300P1 suppression in ovarian cancer cells. We utilized siRNA knockdown in normal ovarian surface epithelial cells and performed cellular proliferation, migration and adhesion assays to validate and explore the profiling results.
  
  
  RESULTS
  We demonstrate that ZNF300P1 is methylated in multiple ovarian cancer cell lines. Loss of ZNF300P1 results in decreased cell proliferation and colony formation. In addition, knockdown of the ZNF300P1 transcript results in aberrant and less persistent migration in wound healing assays due to a loss of cellular polarity. Using an ex vivo peritoneal adhesion assay, we also reveal a role for ZNF300P1 in the attachment of ovarian cancer cells to peritoneal membranes, indicating a potential function of ZNF300P1 expression in metastasis of ovarian cancer cells to sites within the peritoneal cavity.
  
  
  CONCLUSIONS
  Our findings further support ZNF300P1 as frequently methylated in ovarian cancer and reveal a novel function for ZNF300P1 lincRNA expression in regulating cell polarity, motility, and adhesion and loss of expression may contribute to the metastatic potential of ovarian cancer cells.
authors.forename: Brian
authors.initials: B
authors.lastname: Gloss
authors.forename: Kim
authors.initials: K
authors.lastname: Moran-Jones
authors.forename: Vita
authors.initials: V
authors.lastname: Lin
authors.forename: Maria
authors.initials: M
authors.lastname: Gonzalez
authors.forename: James
authors.initials: J
authors.lastname: Scurry
authors.forename: Neville F
authors.initials: NF
authors.lastname: Hacker
authors.forename: Robert L
authors.initials: RL
authors.lastname: Sutherland
authors.forename: Susan J
authors.initials: SJ
authors.lastname: Clark
authors.affiliation: Kinghorn Cancer Centre and Cancer Research Program, Garvan Institute of Medical Research, 370 Victoria Street, 2010, Darlinghurst, NSW, Australia. g.samimi@garvan.org.au.
authors.forename: Goli
authors.initials: G
authors.lastname: Samimi
mesh_terms: D000077216:Carcinoma, Ovarian Epithelial; D002448:Cell Adhesion / Q000235:genetics; D045744:Cell Line, Tumor; D002465:Cell Movement / Q000235:genetics; D016764:Cell Polarity / Q000235:genetics*; D049109:Cell Proliferation; D019175:DNA Methylation / Q000235:genetics; D044127:Epigenesis, Genetic / Q000235:genetics; D005260:Female; D015972:Gene Expression Regulation, Neoplastic; D020868:Gene Silencing; D006801:Humans; D047468:Immunoprecipitation; D009375:Neoplasms, Glandular and Epithelial / Q000235:genetics*; D020411:Oligonucleotide Array Sequence Analysis; D010051:Ovarian Neoplasms / Q000235:genetics*; D016133:Polymerase Chain Reaction; D062085:RNA, Long Noncoding / Q000235:genetics*; D012097:Repressor Proteins / Q000235:genetics*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D062085:RNA, Long Noncoding; D012097:Repressor Proteins; C485905:ZNF300 protein, human