The 3′UTR fragments of CCNG1 containing putative binding sites for miR-1271 were cloned into pMIR-Report construct (Ambion, Austin, TX). The primers (Biomart, Shanghai, China) were constructed according to previous reports [33 (link),34 (link)]. Mutant 3′UTR of CCNG1, which carried a mutated sequence in the complementary site for the seed region of miR-1271, were generated using the fusion PCR method. Luciferase reporter assay was performed in HEK293 cells as described previously [12 (link)].