PRSS1 and cystic fibrosis-related diabetes: Five of the genes (SLC26A9, TCF7L2, CDKAL1, CDKN2A/B, IGF2BP2) were previously identified in Blackman et al. (2013) and the sixth gene, PRSS1, encodes the enzyme cationic trypsinogen which is a biomarker of CFRD at birth (Soave et al., 2014).