Characterization of a new DGKE intronic mutation in genetically unsolved cases of familial atypical hemolytic uremic syndrome

Caterina Mele, Mathieu Lemaire, Paraskevas Iatropoulos, Rossella Piras, Elena Bresin, Serena Bettoni, David Bick, Daniel Helbling, Regan Veith, Elisabetta Valoti, Roberta Donadelli, Luisa Murer, Maria Neunhäuserer, Matteo Breno, Véronique Frémeaux-Bacchi, Richard Lifton, Giuseppe Remuzzi, Marina Noris

Research output: Contribution to journalArticle

Abstract

Background and objectives: Genetic and acquired abnormalities causing dysregulation of the complement alternative pathway contribute to atypical hemolytic uremic syndrome (aHUS), a rare disorder characterized by thrombocytopenia, nonimmune microangiopathic hemolytic anemia, and acute kidney failure. However, in a substantial proportion of patients the disease-associated alterations are still unknown. Design, setting, participants, & measurements: Whole-exome and whole-genome sequencing were performed in two unrelated families with infantile recessive aHUS. Sequencing of cDNA from affected individuals was used to test for the presence of aberrant mRNA species. Expression of mutant diacylglycerol kinase epsilon (DGKE) protein was evaluated with western blotting. Results: Whole-exome sequencing analysis with conventional variant filtering parameters did not reveal any obvious candidate mutation in the first family. The report of aHUS-associated mutations in DGKE, encoding DGKE, led to re-examination of the noncoding DGKE variants obtained from next-generation sequencing, allowing identification of a novel intronic DGKE mutation (c.888+40A>G) that segregated with disease. Sequencing of cDNA from affected individuals revealed aberrant forms of DGKE mRNA predicted to cause profound abnormalities in the protein catalytic site. By whole-genome sequencing, the same mutation was found in compound heterozygosity with a second nonsenseDGKE mutation in all affected siblings of another unrelated family. Homozygous and compound heterozygous patients presented similar clinical features, including aHUS presentation in the first year of life, multiple relapsing episodes, and proteinuria, which are prototypical of DGKE-associated aHUS. Conclusions: This is the first report of a mutation located beyond the exon-intron boundaries in aHUS. Intronic mutations such as these are underreported because conventional filtering parameters used to process next-generation sequencing data routinely exclude these regions from downstream analyses in both research and clinical settings. The results suggest that analysis of noncoding regions of aHUS-associated genes coupled with mRNA sequencing might provide a tool to explain genetically unsolved aHUS cases.

Original languageEnglish
Pages (from-to)1011-1019
Number of pages9
JournalClinical Journal of the American Society of Nephrology
Volume10
Issue number6
DOIs
Publication statusPublished - 2015

Keywords

  • Complement
  • Diacylglycerol kinase epsilon
  • Genetics
  • Hemolytic uremic syndrome
  • Intronic mutation

ASJC Scopus subject areas

  • Nephrology
  • Transplantation
  • Epidemiology
  • Critical Care and Intensive Care Medicine

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    Mele, C., Lemaire, M., Iatropoulos, P., Piras, R., Bresin, E., Bettoni, S., Bick, D., Helbling, D., Veith, R., Valoti, E., Donadelli, R., Murer, L., Neunhäuserer, M., Breno, M., Frémeaux-Bacchi, V., Lifton, R., Remuzzi, G., & Noris, M. (2015). Characterization of a new DGKE intronic mutation in genetically unsolved cases of familial atypical hemolytic uremic syndrome. Clinical Journal of the American Society of Nephrology, 10(6), 1011-1019. https://doi.org/10.2215/CJN.08520814