Abstract
Malignant rhabdoid tumors are highly aggressive neoplasms found primarily in infants and young children. The majority of rhabdoid tumors arise as a result of homozygous inactivating deletions or mutations of the INI1 gene located in chromosome band 22q11.2. Germline mutations of INI1 predispose to the development of rhabdoid tumors of the brain, kidney and extra-renal tissues, consistent with its function as a tumor suppressor gene. We now describe five patients with germline deletions in chromosome band 22q11.2 that included the INI1 gene locus, leading to the development of rhabdoid tumors. Two patients had phenotypic findings that were suggestive but not diagnostic for DiGeorge/Velocardiofacial syndrome (DGS/VCFS). The other three infants had highly aggressive disease with multiple tumors at the time of presentation. The extent of the deletions was determined by fluorescence in situ hybridization and high-density oligonucleotide based single nucleotide polymorphism arrays. The deletions in the two patients with features of DGS/VCFS were distal to the region typically deleted in patients with this genetic disorder. The three infants with multiple primary tumors had smaller but overlapping deletions, primarily involving INI1. The data suggest that the mechanisms underlying the deletions in these patients may be similar to those that lead to DGS/VCFS, as they also appear to be mediated by related, low copy repeats (LCRs) in 22q11.2. These are the first reported cases in which an association has been established between recurrent, interstitial deletions mediated by LCRs in 22q11.2 and a predisposition to cancer.
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Acknowledgments
The authors thank Dr. Sulagna Saitta for her helpful and informative discussions. We would also like to acknowledge Dr. Eric Rappaport, Elizabeth Geiger and Madhavi Vaddi for their technical assistance. Supported by grants from the National Institutes of Health CA46274, CA98543 (J.A.B.) and GM64725 (T.H.S.). Eric Jackson receives grant support from the Neurosurgery Research and Education Foundation.
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Jackson, E.M., Shaikh, T.H., Gururangan, S. et al. High-density single nucleotide polymorphism array analysis in patients with germline deletions of 22q11.2 and malignant rhabdoid tumor. Hum Genet 122, 117–127 (2007). https://doi.org/10.1007/s00439-007-0386-3
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DOI: https://doi.org/10.1007/s00439-007-0386-3