- 作者：Marjun P. Duldulao ; M.D.&lowast ; ; Wendy Lee ; B.A.&lowast ; ; Maithao Le ; M.D. ; Ph.D.&lowast ; ; Zhenbin Chen ; Ph.D.&lowast ; ; Wenyan Li ; B.A.&lowast ; ; Jinhui Wang ; Ph.D.&dagger ; ; Harry Gao ; Ph.D.&dagger ; ; Haiquing Li ; Ph.D.&Dagger ; ; Joseph Kim ; M.D.&lowast ; ; Julio Garcia-Aguilar ; M.D. ; Ph.D.&lowast ; ; jgarcia-aguilar@coh.org
- 关键词：microsatellite stable ; microsatellite unstable ; colon cancer ; Solexa ; gene expression ; ultra-high throughput sequencing ; DNA repair genes ; DNA damage genes ; 5-fluorouracil
- 刊名：Journal of Surgical Research
- 出版年：2012
- 期刊代码：299_00224804
- 类别：med
- 出版时间：1 May, 2012
- 卷：174
- 期：1
- 页码：1-6
- 文件大小：142 K
Background
Microsatellite instability (MSI) is a marker of chemoresistance, but it is associated with improved survival compared with microsatellite-stable (MSS) colon cancers. We hypothesized that MSI tumors overexpress chemoresistance-associated genes and underexpress DNA damage/repair genes. We used ultra high-throughput sequencing (UHTS) to assess the expression of representative genes in MSI and MSS colon cancer cell lines.Methods
Solexa UHTS was used to examine gene expression in HCT116 (MSI) and HT29 (MSS) cells, and normal colonic mucosa (NCM). We compared expression of 40 genes involved in chemoresistance, DNA repair, DNA damage, and drug metabolism pathways.
Results
We observed gene expression differences between MSI and MSS cell lines in 8 out of 40 genes involved in mismatch repair (MMR), DNA repair, drug metabolism, and chemoresistance. MMR gene expression was lower in MSI cells, which is consistent with the MSI phenotype, whereas DNA repair genes were highly expressed in these cells. Genes associated with chemoresistance and drug metabolism also had increased expression in MSI cells. No difference in expression of DNA damage genes was observed between MSI and MSS cell lines.
Conclusion
Using UHTS gene expression analysis, we identified differential expression of genes between MSI and MSS cell lines which may account for resistance to chemotherapy in MSI tumors. UHTS expression analysis has the potential to identify genome-wide predictors of response or resistance to chemotherapy.