A Novel Mutation of UMOD in a Chinese Family with IgA Nephropathy: A Case Report.

IgA nephropathy (IgAN) is the most prevalent primary glomerulonephritis worldwide, with varying clinical presentations. The hereditary susceptibility to IgAN is rather complex. In this report, a Chinese case of IgAN was recruited. Renal biopsy showed the tubular atrophy and dilatation, but the glomerular lesions were rather weak except slight mesangial hyperplasia. Immunological staining of kidney tissue revealed the positive immunological staining of IgA and C3. By using whole-exome sequencing, a heterozygous variant in UMOD gene was found and was confirmed by Sanger sequencing. The variant in UMOD gene might contribute to the disease and this case helps understand the correlation of genotype and phenotypes of UMOD mutations.