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Updated: May 24, 2026
Using 2-Photon Microscopy to Quantify the Effects of Chronic Unilateral Ureteral Obstruction on Glomerular Processes
Published on: March 4, 2022
Alport-like glomerular basement membrane changes with renal-coloboma syndrome
Hiromi Ohtsubo1, Naoya Morisada, Hiroshi Kaito
1Department of Pediatrics, Kobe University Graduate School of Medicine, Japan. tsubo@med.kobe-u.ac.jp
Background:
Autosomal dominant mutations in paired box gene 2 (PAX2), on chromosome 10q24, are responsible for renal coloboma syndrome (RCS). The role of PAX2 in glomerular basement membrane (GBM) formation and maintenance remains unknown.
Case-Diagnosis:
We report a case of a 13-year-old Japanese girl who had both optic disk coloboma and renal insufficiency. Her father and sister also had both coloboma and renal dysfunction. Renal pathological findings revealed a basket-weave pattern of the GBM, which was compatible with Alport syndrome, but type IV collagen α5 staining was normal. The patient's findings of coloboma and renal dysfunction suggested that she had RCS, and genetic analysis revealed a PAX2 heterozygous mutation in exon 2 (c.76dup, p.Val26Glyfsx27) without any mutations of COL4A3, COL4A4, and COL4A5, which are responsible for autosomal and X-linked Alport syndrome.
Conclusions:
PAX2 mutations may result in abnormal GBM structure.
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