FNDC5 and metabolic disease: Long non-coding RNAs (lncRNAs) are emerging regulators of metabolic diseases, but their mechanistic contributions to childhood obesity-associated IR remain underexplored.<h4>Objective</h4>This study investigates whether lncRNA RP11-34D15.2 modulates FFA-induced IR through the miR-223/PGC-1α/irisin signaling axis in obese children.<h4>Methods</h4>We analyzed serum FFA, insulin, irisin, and white adipose tissue (WAT) transcriptomes in 40 obese and 40 normal-weight children.