Mutations in EMP2 cause childhood-onset nephrotic syndrome.

Published

Journal Article

Nephrotic syndrome (NS) is a genetically heterogeneous group of diseases that are divided into steroid-sensitive NS (SSNS) and steroid-resistant NS (SRNS). SRNS inevitably leads to end-stage kidney disease, and no curative treatment is available. To date, mutations in more than 24 genes have been described in Mendelian forms of SRNS; however, no Mendelian form of SSNS has been described. To identify a genetic form of SSNS, we performed homozygosity mapping, whole-exome sequencing, and multiplex PCR followed by next-generation sequencing. We thereby detected biallelic mutations in EMP2 (epithelial membrane protein 2) in four individuals from three unrelated families affected by SRNS or SSNS. We showed that EMP2 exclusively localized to glomeruli in the kidney. Knockdown of emp2 in zebrafish resulted in pericardial effusion, supporting the pathogenic role of mutated EMP2 in human NS. At the cellular level, we showed that knockdown of EMP2 in podocytes and endothelial cells resulted in an increased amount of CAVEOLIN-1 and decreased cell proliferation. Our data therefore identify EMP2 mutations as causing a recessive Mendelian form of SSNS.

Full Text

Cited Authors

  • Gee, HY; Ashraf, S; Wan, X; Vega-Warner, V; Esteve-Rudd, J; Lovric, S; Fang, H; Hurd, TW; Sadowski, CE; Allen, SJ; Otto, EA; Korkmaz, E; Washburn, J; Levy, S; Williams, DS; Bakkaloglu, SA; Zolotnitskaya, A; Ozaltin, F; Zhou, W; Hildebrandt, F

Published Date

  • June 2014

Published In

Volume / Issue

  • 94 / 6

Start / End Page

  • 884 - 890

PubMed ID

  • 24814193

Pubmed Central ID

  • 24814193

Electronic International Standard Serial Number (EISSN)

  • 1537-6605

International Standard Serial Number (ISSN)

  • 0002-9297

Digital Object Identifier (DOI)

  • 10.1016/j.ajhg.2014.04.010

Language

  • eng