CFTR and cystic fibrosis: Several studies have been reported demonstrating that microRNAs are involved in Cystic Fibrosis (CF) [20,21,22,23,24,25,26,27,28], a genetic disease caused by alteration of production and/or biological activity of the gene coding the chloride channel CFTR (Cystic Fibrosis Transmembrane Conductance Regulator) [29,30].