Abstract: 　Objective　To analyze the clinicopathological and pathogenic gene characteristics of Frasier syndrome. Method　The clinicopathological features, genetic testing results and diagnosis and treatment of Frasier syndrome in a child were retrospectively analyzed, and related literature was reviewed. Results　The child had external female genitalia, with a 46, XY karyotype, and suffered from gonadal dysplasia (bilateral ovaries were not developed). The age at onset of nephropathy was 6 years old, and hormone therapy was ineffective. The child was treated with tacrolimus and rituximab successively. Although the serum albumin and cholesterol levels were improved and the renal function was normal, the urinary protein could not turn negative. Kidney biopsy revealed focal segmental glomerulosclerosis, a non-specific type with partial glomerulosclerosis. No gonadal tumors or Wilms tumors were found. Splice mutation of c.1432+5G>A in exon 9 of WT1 gene was detected by gene analysis, which was a spontaneous mutation and was reported to be associated with the pathogenesis of Frasier syndrome. Conclusion　The clinical manifestations of Frasier syndrome are mainly progressive nephropathy, male pseudohermaphroditism and genitourinary malformation. It is related to WT1 gene mutation.

Key words: 　Frasier syndrome;　pathology;　nephrotic syndrome;　WT1 gene