Figure 4
Gene, primary, miRNA and miRNA* expression for paediatric AML defined through clinical classification and DLEU2 Methylation subtyping. Mature microRNA expression, primary precursor transcript (PRI) and alternate miRNA isoform expression (*) from the miR-15a/16-1 miRNA cluster embedded within DLEU2 for paediatric AML patients (n = 26: 12 M5a, 5 M5b, 4 M1/M2/M4, 5 t(11)/+8 sub-group) all compared to non-leukaemic specimens (n = 30). Leukaemic groups refer to diagnostic bone marrow from paediatric patients. Non-leukaemic group consists of CD sorted cell populations (CD19+, CD33+, CD34+, CD45+)and patient remission specimens. Linear Fold Change (FC) is plotted using normalized data and the 2-ΔΔCt method ± SD, and shows the fold change calculated from the means of each group. DLEU2 gene expression is down-regulated in all subtypes. A. Fold change in expression comparing non-leukaemic to t(11)/+8 subtype. No significant differences in RNA expression are observed between non-leukaemic specimens and this subgroup. B. Fold change in expression comparing patients from subtype M5a to M1/M2/M4. DLEU2 is down-regulated in all subtypes (as previously described in Figure 2), and primary precursor for miR-15a also appears down-regulated (non-significant). M1/M2/M4 groupings do not show any mature miRNA expression changes (defined as >2-fold difference from non-leukaemic). Subtype M5a shows a 2.1-fold (±0.8 SD) increase in miR-15a* and a 2.81-fold (±0.4 SD) increase in miR-16-1*. C. FAB subtype M5b shows up-regulation of miR-15a PRI compared to non-leukaemic expression (20.29-fold (±0.6 SD) p < 0.001), with miR-15a* (4.87-fold ±1 SD) and miR-16-1* (9.86-fold ±1 SD) also up-regulated. M5b additionally shows a significant up-regulation of miR-15a PRI compared to t(11)/+8 sub-group samples (p < 0.05), and also from M5a and M1/M2/M4 sub-groups (p < 0.001).