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Case Report: Membranous Nephropathy Secondary to Cobalamin C Disease
Qiang Wang1, Qi Wang1, Yanxia Gao1
1Department of Nephrology, Qilu Hospital (Qingdao), Cheeloo College of Medicine, Shandong University, Qingdao, China.
Background:
Mutation of MMACHC causes inherited cobalamin C disease with methylmalonic academia (MMA) and homocysteinemia. Renal complications may also be present in patients with this deficiency. However, membranous nephropathy secondary to cobalamin C disease has not been reported to date.
Case Presentation:
We encountered a 17-year-old female patient with a trans-compound mutation of MMACHC who presented with membranous nephropathy, MMA, homocysteinemia, and hyperuricemia. The mutations of c.80A>G (chr1:45966084) and c.482G>A (chr1:45974520) (predicting p.Gln27Arg and p.Arg161Gln missense changes at the amino acid level) had been inherited from her father and mother, respectively. Hydroxocobalamin, betaine, and L-carnitine were administered. The patient achieved complete remission of the membranous nephropathy and resolution of the MMA, homocysteinemia, and hyperuricemia.
Conclusion:
Membranous nephropathy secondary to cobalamin C disease is reversible with timely intervention.
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