Abstract
Williams–Beuren syndrome is a neurodevelopmental disorder mainly characterized by dysmorphic features, vascular stenoses, abnormalities of calcium and glucose metabolism, and mental retardation with visuospatial deficits, caused by de novo deletion of 26–28 genes at 7q11.23. Clinical–molecular correlations have defined critically deleted genes as likely responsible for several aspects of the phenotype, but the precise biological pathways affected are mostly unknown. We performed comparative transcriptome profiling of lymphoblastoid cell lines from four Williams–Beuren syndrome patients and two patients with smaller deletions and partial phenotypes. We detected 92 genes deregulated in all patients and 47 genes deregulated only in Williams–Beuren syndrome, with two additional clusters differentially expressed between both groups. Glycolysis and neuronal migration were the most significantly affected pathways by over-representation analyses. In addition, several genes involved in microtubule formation were specifically deregulated in patients with the common deletion. In summary, comparative expression profiling in lymphoblasts has revealed abnormal regulation of gene pathways potentially related to relevant aspects of the Williams–Beuren syndrome phenotype, including the cognitive, visuospatial and metabolic disturbances.
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Acknowledgments
We thank patients and families for their collaboration and Drs Dieter Kotzot and Jorge Martínez de la Iglesia for referring cases with atypical deletions. LCLs from controls and two WBS patients were kindly provided by Drs Xavier Estivill and Lucy Osborne, respectively. We also thank Drs Benjamín Rodriguez-Santiago and Andrés Medrano for helpful discussion and Annabelle Parent and Anna Carreras for technical assistance, as well as Charlotte Henrichsen, Alexandre Reymond and Giuseppe Merla for sharing unpublished transcriptomic data from WBS fibroblast cell lines. This work was funded by the European Commission AnEUploidy integrated project (FP6-2005-LIFESCIHEALTH-7) to L.P.J. The experiments comply with the current laws of the country in which they were performed.
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Antonell, A., Vilardell, M. & Pérez Jurado, L.A. Transcriptome profile in Williams–Beuren syndrome lymphoblast cells reveals gene pathways implicated in glucose intolerance and visuospatial construction deficits. Hum Genet 128, 27–37 (2010). https://doi.org/10.1007/s00439-010-0817-4
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DOI: https://doi.org/10.1007/s00439-010-0817-4