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Kidney in Galloway-Mowat syndrome: clinical spectrum with description of pathology
1Department of Pathology, Cedars-Sinai Medical Center, Los Angeles, California.
Abstract:
The Galloway-Mowat syndrome, a rare inherited disorder, is characterized by congenital microcephaly with hypotonia and developmental delay, often hiatus hernia, and nephrotic syndrome manifested in infancy or in early childhood. The glomerular lesion has been poorly characterized in the few previous reports of this syndrome. We studied three siblings with microcephaly and nephrotic syndrome occurring during the first two weeks of life. Hematuria, glycosuria and renal failure were also present. Renal biopsy and postmortem specimens of two patients were studied. Glomerular structure was disorganized; capillary lumina were of varying calibers, capillary walls were adherent to one another, and mesangial zones were poorly demarcated. Glomerular basement membrane ultrastructure was markedly altered. The normal trilaminar structure was obscured or replaced by flocculent material; furthermore, 6 to 8 nm fibrils of unknown nature permeated the space between endothelial and epithelial cells. Non-glomerular basement membranes were unaltered in appearance. This syndrome apparently represents, in part, a new disorder of glomerular basement membrane formation and function.
Insights
Galloway-Mowat syndrome, a rare inherited disorder, involves microcephaly and nephrotic syndrome. This study reveals significant alterations in glomerular basement membranes, suggesting a novel disorder of kidney development.
Area of Science:
- Nephrology
- Genetics
- Pediatrics
Background:
- Galloway-Mowat syndrome is a rare inherited disorder.
- It presents with congenital microcephaly, hypotonia, developmental delay, and often nephrotic syndrome.
- Glomerular lesions in this syndrome are poorly understood.
Purpose of the Study:
- To investigate the glomerular pathology in Galloway-Mowat syndrome.
- To characterize the renal lesions in affected infants.
Main Methods:
- Studied three siblings with early-onset microcephaly and nephrotic syndrome.
- Analyzed renal biopsy and postmortem specimens using light and electron microscopy.
Main Results:
- Observed disorganized glomerular structure with varying capillary sizes and adherent walls.
- Found marked alterations in glomerular basement membrane ultrastructure, including flocculent material and unknown fibrils.
- Non-glomerular basement membranes appeared normal.
Conclusions:
- Galloway-Mowat syndrome involves a novel disorder of glomerular basement membrane formation and function.
- The findings provide new insights into the pathogenesis of this rare genetic kidney disease.