Coinheritance of COL4A5 and MYO1E mutations accentuate the severity of kidney disease

Rachel Lennon, Helen M Stuart, Agnieszka Bierzynska, Michael J Randles, Bronwyn Kerr, Katherine A Hillman, Gauri Batra, Joanna Campbell, Helen Storey, Frances A Flinter, Ania Koziell, Gavin I Welsh, Moin A Saleem, Nicholas J A Webb, Adrian S Woolf

    Research output: Contribution to journalArticlepeer-review

    37 Citations (Scopus)

    Abstract

    BACKGROUND: Mutations in podocyte and basement membrane genes are associated with a growing spectrum of glomerular disease affecting adults and children. Investigation of familial cases has helped to build understanding of both normal physiology and disease.

    METHODS: We investigated a consanguineous family with a wide clinical phenotype of glomerular disease using clinical, histological, and new genetic studies.

    RESULTS: We report striking variability in severity of nephropathy within an X-linked Alport syndrome (XLAS) family. Four siblings each carried a mutant COL4A5 allele, p.(Gly953Val) and p.(Gly1033Arg). Two boys had signs limited to hematuria and mild/moderate proteinuria. In striking contrast, a sister presented with end-stage renal disease (ESRD) at 8 years of age and an infant brother presented with nephrotic syndrome, progressing to ESRD by 3 years of age. Both were subsequently found to have homozygous variants in MYO1E, p.(Lys118Glu) and p.(Thr876Arg). MYO1E is a gene implicated in focal segmental glomerulosclerosis and it encodes a podocyte-expressed non-muscle myosin. Bioinformatic modeling demonstrated that the collagen IV-alpha3,4,5 extracellular network connected via known protein-protein interactions to intracellular myosin 1E.

    CONCLUSIONS: COL4A5 and MYO1E mutations may summate to perturb common signaling pathways, resulting in more severe disease than anticipated independently. We suggest screening for MYO1E and other non-COL4 'podocyte gene' mutations in XLAS when clinical nephropathy is more severe than expected for an individual's age and sex.

    Original languageEnglish
    Number of pages7
    JournalPediatric nephrology (Berlin, Germany)
    Early online date5 Mar 2015
    DOIs
    Publication statusPublished - 2015

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