Nephrin mutations cause childhood-and adult-onset focal segmental glomerulosclerosis

Sheila Santín, Rafael García-Maset, Patricia Ruíz, Isabel Giménez, Isabel Zamora, Antonia Pẽa, Lvaro Madrid, Juan A. Camacho, Gloria Fraga, Ana Sánchez-Moreno, Maria Ngeles Cobo, Carmen Bernis, Alberto Ortiz, Augusto Luque De Pablos, Guillem Pintos, Maria Luisa Justa, Emilia Hidalgo-Barquero, Patricia Fernández-Llama, José Ballarín, Elisabet ArsRoser Torra

    Research output: Contribution to journalArticleResearchpeer-review

    99 Citations (Scopus)

    Abstract

    Mutations in the NPHS1 gene cause congenital nephrotic syndrome of the Finnish type presenting before the first 3 months of life. Recently, NPHS1 mutations have also been identified in childhood-onset steroid-resistant nephrotic syndrome and milder courses of disease, but their role in adults with focal segmental glomerulosclerosis remains unknown. Here we developed an in silico scoring matrix to evaluate the pathogenicity of amino-acid substitutions using the biophysical and biochemical difference between wild-type and mutant amino acid, the evolutionary conservation of the amino-acid residue in orthologs, and defined domains, with the addition of contextual information. Mutation analysis was performed in 97 patients from 89 unrelated families, of which 52 presented with steroid-resistant nephrotic syndrome after 18 years of age. Compound heterozygous or homozygous NPHS1 mutations were identified in five familial and seven sporadic cases, including one patient 27 years old at onset of the disease. Substitutions were classified as severe or mild using this in silico approach. Our results suggest an earlier onset of the disease in patients with two severe mutations compared to patients with at least one mild mutation. The finding of mutations in a patient with adult-onset focal segmental glomerulosclerosis indicates that NPHS1 analysis could be considered in patients with later onset of the disease. © 2009 International Society of Nephrology.
    Original languageEnglish
    Pages (from-to)1268-1276
    JournalKidney International
    Volume76
    Issue number12
    DOIs
    Publication statusPublished - 1 Dec 2009

    Keywords

    • Adult
    • Congenital nephrotic syndrome of the Finnish type (CNF)
    • Focal and segmental glomerulosclerosis (FSGS)
    • In silico scoring system analysis
    • NPHS1 gene
    • Steroid-resistant nephrotic syndrome (SRNS)

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