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Genome‐wide analysis of allelic imbalances reveals 4q deletions as a poor prognostic factor and MDM4 amplification at 1q32.1 in hepatoblastoma
Author(s) -
Arai Yasuhito,
Honda Shohei,
Haruta Masayuki,
Kasai Fumio,
Fujiwara Yuiko,
Ohshima Junjiro,
Sasaki Fumiaki,
Nakagawara Akira,
Horie Hiroshi,
Yamaoka Hiroyuki,
Hiyama Eiso,
Kaneko Yasuhiko
Publication year - 2010
Publication title -
genes, chromosomes and cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.754
H-Index - 119
eISSN - 1098-2264
pISSN - 1045-2257
DOI - 10.1002/gcc.20770
Subject(s) - biology , hepatoblastoma , allele , missense mutation , genetics , gene , cancer research , single nucleotide polymorphism , microbiology and biotechnology , mutation , medicine , genotype
In a single‐nucleotide polymorphism array‐based analysis of 56 hepatoblastoma (HB) tumors, allelic imbalances were detected in 37 tumors (66%). Chromosome gains were found in 1q (28 tumors), 2q (24), 6p (8), 8q (8), 17q (6), and 20pq (10), and losses in 1p (6), 4q (9), and 16q (4). Fine mapping delineated the shortest overlapping region (SOR) of gains at 1q32.1 (1.3 Mb) and 2q24.2‐q24.3 (4.8 Mb), and losses at 4q34.3‐q35.2 (8.7 Mb) and 4q32.3 (1.6 Mb). Uniparental disomy of 11pter‐11p15.4 ( IGF2 ) and loss of 11pter‐p14.1 were found in 11 and 2 tumors, respectively. Expression of HTATIP2 (11p15.1) was absent in 9 of 20 tumors. Amplification was identified in four tumors at 1q32.1, where the candidate oncogene MDM4 is located. In the 4q32.3‐SRO, ANXA10S , a variant of the candidate tumor suppressor ANXA10 , showed no expression in 19 of 24 tumors. Sequence analysis of ANXA10S identified a missense mutation (E36K, c.106G>A) in a HB cell line. Multivariate analysis revealed that both 4q deletion and RASSF1A methylation (relative risks: 4.21 and 7.55, respectively) are independent prognostic factors. Our results indicate that allelic imbalances and gene expression patterns provide possible diagnostic and prognostic markers, as well as therapeutic targets in a subset of HB. © 2010 Wiley‐Liss, Inc.