A complex karyotype in an atypical teratoid/rhabdoid tumor: case report and review of the literature

被引:13
作者
Cocce, Mariela C. [1 ]
Lubieniecki, Fabiana [2 ]
Kordes, Uwe [3 ]
Alderete, Daniel [4 ]
Gallego, Marta S. [1 ]
机构
[1] Garrahan Pediat Hosp, Dept Genet, Cytogenet Lab, RA-1245 Buenos Aires, DF, Argentina
[2] Garrahan Pediat Hosp, Dept Pediat, RA-1245 Buenos Aires, DF, Argentina
[3] Univ Med Ctr Hamburg Eppendorf, Dept Pediat Hematol & Oncol, D-20246 Hamburg, Germany
[4] Garrahan Pediat Hosp, Hematooncol Dept, RA-1245 Buenos Aires, DF, Argentina
关键词
Atypical teratoid/rhabdoid tumor; Cytogenetic; Chromosomal abnormalities; Fluorescence in-situ hybridization; CENTRAL-NERVOUS-SYSTEM; MALIGNANT RHABDOID TUMOR; COMPARATIVE GENOMIC HYBRIDIZATION; PEDIATRIC BRAIN-TUMORS; CYTOGENETIC ANALYSIS; INSTABILITY; MUTATIONS; CANCER; HSNF5/INI1; CHILDHOOD;
D O I
10.1007/s11060-010-0478-0
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Atypical teratoid/rhabdoid tumor (AT/RT) is a highly aggressive and uncommon neoplasm of the central nervous system that usually occurs in children less than 2 years of age. It is characterized by deletions and/or mutations of the INI1 tumor suppressor gene located in chromosome band 22q11.2. We performed cytogenetic and molecular studies of an AT/RT on a 15-month-old boy. The tumor showed a complex karyotype with one cell line showing monosomy 22 and another near-tetraploid one with additional chromosomal abnormalities, involving chromosomes 2, 3, 5, 6, and Y, which had not been previously described. Sequence analysis of the tumor did not identify mutations of the INI1 gene. The karyotypic evolution observed in this tumor suggests that INI1 has an epigenetic role in the maintenance of genome integrity by affecting genes, which produces mitotic defects and polyploidy. Finally, this case is the first to support the theory that loss of INI1 could induce the chromosomal instability that might be responsible for the genesis of this tumor.
引用
收藏
页码:375 / 380
页数:6
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