The online version of this article (doi:10.1186/s12885-017-3206-8) contains supplementary material, which is available to authorized users.
Tumour stem cells are considered important to promote disease progression, recurrence and treatment resistance following chemotherapy in colon cancer. However, genomic analyses of colorectal cancer have mainly been performed on integrated tumour tissue consisting of several different cell types in addition to differentiated tumour cells. The purpose of the present study was to compare genomic alterations in two cell fractions enriched of CD133+ and CD133−/EpCAM+ cells, respectively, obtained from fresh intraoperative human tumour biopsies.
The tumour biopsies were fractionated into CD133+ and CD133−/EpCAM+ cells by immunomagnetic separation, confirmed by immunocytochemistry and Q-PCR. DNA were extracted and used for array comparative genome hybridization (aCGH) after whole genome amplification. Frozen tumour tissue biopsies were used for DNA/RNA extraction and Q-PCR analyses to check for DNA alterations detected in the cell fractions.
The number and size of DNA alterations were equally distributed across the cell fractions; however, large deletions were detected on chromosome 1, 7 and 19 in CD133−/EpCAM+ cells. Deletions were frequent in both cell fractions and a deletion on chromosome 19p was confirmed in 90% of the patients.
Isolation of enriched cells derived from tumour tissue revealed mainly genomic deletions, which were not observed in tumour tissue DNA analyses. CD133+ cells were genetically heterogeneous among patients without any defined profile compared to CD133−/EpCAM+ cells.
Additional file 1: Table S1. Primer sequences for chromosome 19p Q-PCR on tumor tissue. (DOCX 19 kb)12885_2017_3206_MOESM1_ESM.docx
Additional file 2: Table S2. Shared deletions among CD133+ and CD133−/EpCAM+ cell fractions analyzed with inter-array analysis. Chromosomal location and size (bp) of shared deletions. (DOCX 20 kb)12885_2017_3206_MOESM2_ESM.docx
Additional file 3: Table S3. Chromosome 19p gene list (575 genes in the deleted region at chromosome 19p). Name of the genes located in the deleted region at chromosome 19p. (DOCX 27 kb)12885_2017_3206_MOESM3_ESM.docx
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- DNA alterations in Cd133+ and Cd133- tumour cells enriched from intra-operative human colon tumour biopsies
Annika G. Asting
- BioMed Central
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