G6PC1 and psoriatic arthritis: Among the PA mutation carriers, we documented different numbers of cases across all the conditions, ranging from 1 (0.3% for celiac disease) to 33 (10.6% for depressive disorder) for the CRP gene and 1 (0.2% for psoriatic arthritis) to 68 (10.3% for depressive disorder) for the G6PC gene.