hsa-mir-4259: Hsa-mir-4259 is a microRNA implicated in the regulation of various target genes, including those involved in the JAK-STAT signaling pathway, such as SPRY4, and transcription regulation genes [PMC5374554]. Although its whole sequence cannot be aligned onto the human genome, hsa-mir-4259 shares target seed sequences with miR2910 and hsa-miR-4715-5p [PMC5374554]. This microRNA has been detected in saliva samples, but its quantification in plasma samples has not been extensively studied [PMC9481579]. Hsa-mir-4259 was not validated in certain studies that included other miRNAs such as hsa-miR-142-5p and hsa-miR-1293 [PMC9481579]. It was not detected in a selection that included successfully quantified miRNAs like hsa-miR-92a-3p and hsa-miR-486-5p [PMC9481579]. Furthermore, hsa-mir-4259 is associated with pre-miRNA loops that form rG4 structures, which are sequences capable of forming G-quadruplexes [PMC7723054]. It was found to be present only in untreated extracellular vesicles (EVs) and absent from cells and EVs treated with proteinase K and RNase-A/T1 [PMC10138286], indicating its selective presence under certain conditions. Lastly, it is identified among hub genes, suggesting its potential role in gene regulatory networks [PMC9851797].