LAMB2 mutation with different phenotypes in China
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BACKGROUND: Mutations of the LAMB2 gene mainly cause Pierson syndrome (OMIM) #609049), characterized by congenital nephrotic syndrome (CNS) and complex ocular involvements with microcoria as the most prominent clinical feature. However, the phenotypic spectrum of LAMB2-associated disorders is broader, isolated congenital or infantile nephrotic syndrome can also be seen. The aim of this study was to explore the phenotypes of different LAMB2 mutations in China.

METHODS: LAMB2 mutations were analyzed in three Chinese childhood steroid-resistant nephrotic syndrome cases, two of them with ocular abnormalities.

RESULTS: LAMB2 mutations were confirmed in all the three cases, two presented with Pierson syndrome, while one presented with isolated infantile steroid-resistant nephrotic syndrome.

CONCLUSIONS: The phenotypes caused by LAMB2 mutation were variable, mainly Pierson syndrome, as well as isolated nephrotic syndrome without ocular involvement. Mutational analysis of LAMB2 should be considered in all steroid-resistant nephrotic syndrome patients, with or without any ocular abnormalities.
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