Loss of STAG2 causes aneuploidy in normal human bladder cells

Genet Mol Res. 2015 Mar 30;14(1):2638-46. doi: 10.4238/2015.March.30.24.


The aim of this study was to determine how the function of human stromal antigen 2 (STAG2) plays an important role in proper chromosome separation. STAG2 mRNA in normal bladder cells and bladder tumor cells was evaluated by RT-PCR. The protein levels of STAG2 in normal bladder cells and bladder tumor cells were determined by western blot. A cell proliferation assay was used to measure the growth of tumor cells and STAG2-inhibited normal cells, and STAG2- inhibited normal cells were subjected to karyotype analysis. Both STAG-2 mRNA and protein expression levels were lower in bladder cancer cells compared to the controls. Knockdown of STAG2 caused aneuploidy in normal bladder cells, leading to a decreased expression of the cohesin complex components SMC1, SMC3 and RAD21, but there was no obvious effect of STAG2 knockdown on cell proliferation. Our study indicated that abnormal expression of STAG2 could cause aneuploidy in normal bladder cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aneuploidy*
  • Antigens, Nuclear / genetics*
  • Antigens, Nuclear / metabolism
  • Blotting, Western
  • Cell Cycle Proteins / genetics
  • Cell Cycle Proteins / metabolism
  • Cell Line
  • Cell Line, Tumor
  • Chondroitin Sulfate Proteoglycans / genetics
  • Chondroitin Sulfate Proteoglycans / metabolism
  • Chromosomal Proteins, Non-Histone / genetics
  • Chromosomal Proteins, Non-Histone / metabolism
  • DNA-Binding Proteins
  • Gene Expression*
  • Humans
  • Karyotyping
  • Nuclear Proteins / genetics
  • Nuclear Proteins / metabolism
  • Phosphoproteins / genetics
  • Phosphoproteins / metabolism
  • RNA Interference*
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism
  • Reverse Transcriptase Polymerase Chain Reaction
  • Urinary Bladder / cytology
  • Urinary Bladder / metabolism
  • Urinary Bladder Neoplasms / genetics
  • Urinary Bladder Neoplasms / metabolism
  • Urinary Bladder Neoplasms / pathology


  • Antigens, Nuclear
  • Cell Cycle Proteins
  • Chondroitin Sulfate Proteoglycans
  • Chromosomal Proteins, Non-Histone
  • DNA-Binding Proteins
  • Nuclear Proteins
  • Phosphoproteins
  • RAD21 protein, human
  • RNA, Messenger
  • SMC3 protein, human
  • STAG2 protein, human
  • structural maintenance of chromosome protein 1