Truncating mutations of hSNF5/INI1 in aggressive paediatric cancer

Isabella Versteege, Nicolas Sévenet, Julian Lange, Marie-Françoise Rousseau-Merck, Peter Ambros, Rupert Handgretinger, Alain Aurias and Olivier Delattre ()
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Isabella Versteege: Laboratoire de Pathologie Moléculaire des Cancers, Section de Recherche, Institut Curie
Nicolas Sévenet: Laboratoire de Pathologie Moléculaire des Cancers, Section de Recherche, Institut Curie
Julian Lange: Laboratoire de Pathologie Moléculaire des Cancers, Section de Recherche, Institut Curie
Marie-Françoise Rousseau-Merck: Laboratoire de Pathologie Moléculaire des Cancers, Section de Recherche, Institut Curie
Peter Ambros: CCRI, St Anna Kinderspital, Kinderspitalgasse 6
Rupert Handgretinger: Universität Kinderklinik, Rümelinstrasse 23
Alain Aurias: Laboratoire de Pathologie Moléculaire des Cancers, Section de Recherche, Institut Curie
Olivier Delattre: Laboratoire de Pathologie Moléculaire des Cancers, Section de Recherche, Institut Curie

Nature, 1998, vol. 394, issue 6689, 203-206

Abstract: Abstract Malignant rhabdoid tumours (MRTs) are extremely aggressive cancers of early childhood. They can occur in various locations, mainly the kidney, brain and soft tissues1,2. Cytogenetic and molecular analyses have shown that the deletion of region 11.2 of the long arm of chromosome 22 (22q11.2) is a recurrent genetic characteristic of MRTs, indicating that this locus may encode a tumour suppressor gene3,4,5,6,7,8. Here we map the most frequently deleted part of chromosome 22q11.2 from a panel of 13 MRT cell lines. We observed six homozygous deletions that delineate the smallest region of overlap between the cell lines. This region is found in the hSNF5/INI1 gene, which encodes a member of the chromatin-remodelling SWI/SNF multiprotein complexes9,10,11,12. We analysed the sequence of hSNF5/INI1 and found frameshift or nonsense mutations of this gene in six other cell lines. These truncating mutations of one allele were associated with the loss of the other allele. Identical alterations were observed in corresponding primary tumour DNAs but not in matched constitutional DNAs, indicating that they had been acquired somatically. The observation of bi-allelic alterations of hSNF5/INI1 in MRTs suggests that loss-of-function mutations of hSNF5/INI1 contribute to oncogenesis.

Date: 1998
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DOI: 10.1038/28212

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