Abstract
Background
Pierson syndrome, caused by mutations in the LAMB2 gene, was originally described as a combination of microcoria and congenital nephrotic syndrome, rapidly progressing to end-stage renal failure.
Case-Diagnosis/Treatment
We report a minor variant of Pierson syndrome in a teenage girl with severe myopia since early infancy and proteinuria first detected at age 6. At the age of 11 she was found to carry a unique homozygous non-truncating LAMB2 mutation in exon 2: c.T240G (p.S80R). Renal biopsy revealed mild diffuse mesangial sclerosis and residual expression of laminin β2. Today at age 14, on treatment with angiotensin-converting enzyme inhibitors and angiotensin receptor blockers, she continues to have nephrotic range proteinuria, but a normal glomerular filtration rate.
Conclusions
LAMB2 mutations should be considered in all patients with glomerular proteinuria and abnormal ocular phenotype, irrespective of age and disease severity.
References
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Acknowledgements
This work was supported by a grant from the German Research Foundation (DFG; SFB 423 TP B19) to M.Z. We thank Prof. Dr. Udo Helmchen from the Institute of Pathology at the University Medical Center Hamburg-Eppendorf for providing histology results.
The authors declare that they do not have any conflicts of interest and that the results presented in this paper have not been published previously in whole or part, except in abstract form.
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Martin Zenker and Markus J. Kemper contributed equally
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Lehnhardt, A., Lama, A., Amann, K. et al. Pierson syndrome in an adolescent girl with nephrotic range proteinuria but a normal GFR. Pediatr Nephrol 27, 865–868 (2012). https://doi.org/10.1007/s00467-011-2088-2
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DOI: https://doi.org/10.1007/s00467-011-2088-2