Trinucleotide repeat expansion disorders constitute a group of dominantly inherited neurological diseases that are incurable and ultimately fatal. In the present work, miRNA binding sites were predicted by the MirTarget program. It was given characteristics of miRNAs binding sites in 5' and 3' UTR mRNAs genes of non-polyglutamine trinucleotide disorders with CGG, GCC, CUG repeats. Binding sites of 2567 miRNAs with mRNAs of 17494 human genes were determined. 206 genes with nucleotide repeats, mRNAs of which are bind with miRNA in the 5'UTR and 3'UTR, were observed. From thus, 2668 miRNAs binding sites are located in the 5'UTR, 3853 – in the 3'UTR with ΔG/ΔGm values equal to 85 % and more. It was found that 34 gene’s mRNA having trinucleotide (CGG\GCC\CUG) repeats were targets for miR-4258, miR-3960 miR-211-3p and miR-3155b. miR-4258 binds to mRNA of ADARB1, C11orf87 and CBFB genes with free binding energy - 93 kJ/mole and ΔG/ΔGm 91%, to mRNA of ARHGEF7, BCR, BRSK2 and C9orf91 genes with free binding energy - 91 kJ/mole and ΔG/ΔGm 89%. miR-3960 binds in GCC repeats to mRNA of ABCC1 and BLMH genes with free binding energy - 116 kJ/mole. miR-211-3p and miR-3155b interact with mRNA of ACACA and ANKRD13D genes in 5’-3’untranslated regions. Studying binding characteristics of miRNA and genes will help identify association of miRNAs with genes with trinucleotide repeats for recommending for the diagnosis of nucleotide repeat expansion disorders.
Dynamic mutations pose unique challenges for the molecular diagnostics laboratory