CFHR5 and IgA glomerulonephritis: Transcriptomic-wide MR identified candidate genes across GN subtypes: RECQL, BRSK2, and MGP in acute GN; AFM, CFHR5, and EPHB2 in chronic GN; IL6R, MBL2, and PRSS3 in IgA nephropathy; and TIMP4, HCK, and PEAR1 in membranous nephropathy.