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We had encountered the case of membranous glomerulonephritis (MGN) with dilated cardiomyopathy due to LMNA gene mutation. LMNA mutation was known as a cause of ‘laminopathy’ such as dilated cardiomyopathy, muscular dystrophy, neuropathy and so on. LMNA gene might be a candidate of genetic basis in cryptogenic MGN.

We performed renal biopsy in three cases complicated by myeloproliferative neoplasms (MPN). Although several cases of glomerulonephritis associated with MPN have been reported, the etiologies of the renal disorders were not established (Plomley et al., Aust NZ J Med, 13:125-129, 1983; Sharma et al., Nephron, 69:361, 1995; Kanauchi et al., Intern Med, 33:36-40, 1994; Kasuno et al., Nephrol Dial Transplant, 12:212-215, 1997; Au et al., Am J Kid Dis, 34:889-893, 1999; Kosch et al., Nephrol Dial Transplant, 15:1710-1711, 2000; Oymak et al., Nephron, 86:346-347, 2000; Chun et al., Am J Nephrol, 20:344-346, 2000; Chung et al., Am J Nephrol, 22:397-401, 2002; Asaba et al., Clin Exp Nephrol, 7:296-300, 2003; Haraguchi et al., Clin Exp Nephrol, 10:74-77, 2006; Saigusa et al., J Nephrol, 19:656-658, 2006; Okuyama et al., Clin Nephrol, 6:412-415, 2007; Nishi et al., Clin Nephrol, 5:393-398, 2010; Ulusoy et al., Intern Med, 49:2477, 2010). A review of previous reports of renal biopsy cases with MPN in the English literature suggested that circulation control is important for the treatment of renal disorders that mimic glomerulonephritis in MPN.