Abstract
The role of microRNAs (miRNAs) in human cancer biology has been confirmed on a genome-wide scale through the high incidence of these genes in cancer-associated regions. We analyzed the association between canine miRNA genes and cancer-associated regions (deleted and amplified regions) using previously published array of comparative genomic hybridization data on 268 canine cancer samples—comprising osteosarcoma, breast cancer, leukemia, and colorectal cancer. We also assessed this relationship apropos the incidence of miRNA genes in the CpG islands of the canine genome assembly. The association was evaluated using the mixed-effects Poisson regression analysis. Our analyses revealed that 135 miRNA genes were exactly located in the aberrated regions: 77 (57 %) in the loss and 58 (43 %) in amplified regions. Our findings indicated that the miRNA genes were located more frequently in the deleted regions as well as in the CpG islands than in all other regions. Additionally, with the exception of leukemia, the amplified regions significantly contained higher numbers of miRNA genes than did all the other regions.
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I wish to thank Mr. Farshad Amouzadeh, who assisted in the proofreading of the manuscript.
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Supplementary Table 1
MiRNA genes overlapped or matched with transposable elements (TEs) in canine genome assembly. Most of the miRNA genes simply overlapped with TEs. Additionally, 43 out of 54 suspected miRNAs were previously validated experimentally. Minimum-free energy was calculated for each miRNA. (DOCX 35 kb)
Supplementary Tables 2–8
Loss (green) and amplified (red) regions containing miRNA genes in various cancers. Start and end variables indicate the aberrated region position in the chromosome. (DOCX 43 kb)
Supplementary Table 9
Syntenic blocks of the canine regions containing miRNA genes located in loss regions in the human genome assembly. (DOCX 27 kb)
Supplementary Table 10
Syntenic blocks of the canine regions containing miRNA genes located in amplified regions in the human genome assembly. (DOCX 25 kb)
Supplementary Table 11
Syntenic blocks of the canine CpG islands with miRNA genes in human genome assembly. (DOCX 27 kb)
Supplementary Table 12
Exploration of human RefSeq genes that map to orthologous aberrant dog regions in CanGEM database. Most of the interested RefSeq genes indicated aberration changes in the human cancers (loss: green rows, gain: red rows, and CpG islands: yellow rows). (DOCX 31 kb)
Supplementary Table 13
Exploration of human RefSeq genes that map to orthologous aberrant dog regions in the Network of Cancer Genes (loss: green rows, gain: red rows, and CpG islands: yellow rows). (DOCX 25 kb)
Supplementary Table 14
CpG islands containing miRNA genes in the canine genome. Chr, start, end, and length denote chromosome location, start position, end position, and sequence length for each CpG island, respectively. (DOCX 28 kb)
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Zamani-Ahmadmahmudi, M. Relationship between microRNA genes incidence and cancer-associated genomic regions in canine tumors: a comprehensive bioinformatics study. Funct Integr Genomics 16, 143–152 (2016). https://doi.org/10.1007/s10142-016-0473-4
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DOI: https://doi.org/10.1007/s10142-016-0473-4