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Combined Genotype Analyses of Precursor miRNA-196a2 and -499a Variants with Hepatic and Renal Cancer Susceptibility- a Preliminary Study

  • Toraih, Eman A (Department of Histology and Cell Biology (Genetics Unit)) ;
  • Fawzy, Manal S (Department of Medical Biochemistry, Faculty of Medicine, Suez Canal University) ;
  • Elgazzaz, Mona G (Department of Histology and Cell Biology (Genetics Unit)) ;
  • Hussein, Mohammad H (Ministry of Health) ;
  • Shehata, Rasha H (Department of Tropical Medicine and Gasteroenterology, Assuit University) ;
  • Daoud, Hisham G (Department of Electrical Engineering, Faculty of Engineering, Canadian International College)
  • Published : 2016.07.01

Abstract

MicroRNAs, a novel class of small non-coding RNAs, are key players in many cellular processes, including cell proliferation, differentiation, invasion and regeneration. Tissue and circulatory microRNAs could serve as useful clinical biomarkers and deregulated expression levels have been observed in various cancers. Gene variants may alter microRNA processing and maturation. Thus, we aimed to investigate the association of MIR-196a2 rs11614913 (C/T), MIR-499a rs3746444 (A/G) polymorphisms and their combination with cancer susceptibility in an Egyptian population. Sixty five renal cell carcinoma (RCC) and 60 hepatocellular carcinoma (HCC) patients and 150 controls were enrolled in the study. They were genotyped using real-time polymerase chain reaction technology. Both $miR-196a2^*T$ and $miR-499a*G$ were associated with RCC risk, but only $miR-196a^*T$ was associated with HCC development. Carriage of the homozygote combinations ($MIR196a2^*TT+MIR499a^*AA$) and ($MIR196a2^*CC+MIR499a^*GG$) was associated with 25 and 48 fold elevation of likelhood to develop RCC, respectively. The miR-196a2 SNP was also linked with larger tumor size in RCC and advanced tumor stage in HCC. miR-196a2 and miR-499a combined genotypes were associated with RCC and HCC. Further functional analysis of SNPs is required to confirm relationships between genotypes and phenotypes.

Keywords

MIR-196a2;MIR-499a;SNP;HCC;RCC

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