Isolated NIBPL missense mutations that cause Cornelia de Lange syndrome alter MAU2 interaction

Diana Braunholz, Melanie Hullings, María Concepcion Gil-Rodríguez, Christopher T. Fincher, Mark B. Mallozzi, Elizabeth Loy, Melanie Albrecht, Maninder Kaur, Janusz Limon, Abhinav Rampuria, Dinah Clark, Antonie Kline, Juliane Eckhold, Andreas Tzschach, Raoul Hennekam, Gabriele Gillessen-Kaesbach, Jolanta Wierzba, Ian D. Krantz, Matthew A. Deardorff, Frank J. Kaiser

Research output: Contribution to journalArticle

Abstract

Cornelia de Lange syndrome (CdLS; or Brachmann-de Lange syndrome) is a dominantly inherited congenital malformation disorder with features that include characteristic facies, cognitive delays, growth retardation and limb anomalies. Mutations in nearly 60% of CdLS patients have been identified in NIPBL, which encodes a regulator of the sister chromatid cohesion complex. NIPBL, also known as delangin, is a homolog of yeast and amphibian Scc2 and C. elegans PQN-85. Although the exact mechanism of NIPBL function in sister chromatid cohesion is unclear, in vivo yeast and C. elegans experiments and in vitro vertebrate cell experiments have demonstrated that NIPBL/Scc2 functionally interacts with the MAU2/Scc4 protein to initiate loading of cohesin onto chromatin. To test the significance of this model in the clinical setting of CdLS, we fine-mapped the NIBPL-MAU2 interaction domain and tested the functional significance of missense mutations and variants in NIPBL and MAU2 identified in these minimal domains in a cohort of patients with CdLS. We demonstrate that specific novel mutations at the N-terminus of the MAU2-interacting domain of NIBPL result in markedly reduced MAU2 binding, although we appreciate no consistent clinical difference in the small group of patients with these mutations. These data suggest that factors in addition to MAU2 are essential in determining the clinical features and severity of CdLS.

Original languageEnglish (US)
Pages (from-to)271-276
Number of pages6
JournalEuropean Journal of Human Genetics
Volume20
Issue number3
DOIs
StatePublished - Mar 1 2012

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Keywords

  • Cornelia de Lange syndrome
  • MAU2
  • NIPBL
  • SCC4
  • cohesin
  • sister chromatid cohesion

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

Cite this

Braunholz, D., Hullings, M., Gil-Rodríguez, M. C., Fincher, C. T., Mallozzi, M. B., Loy, E., Albrecht, M., Kaur, M., Limon, J., Rampuria, A., Clark, D., Kline, A., Eckhold, J., Tzschach, A., Hennekam, R., Gillessen-Kaesbach, G., Wierzba, J., Krantz, I. D., Deardorff, M. A., & Kaiser, F. J. (2012). Isolated NIBPL missense mutations that cause Cornelia de Lange syndrome alter MAU2 interaction. European Journal of Human Genetics, 20(3), 271-276. https://doi.org/10.1038/ejhg.2011.175