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High‐resolution gene copy number and expression profiling of human chromosome 22 in ovarian carcinomas
Author(s) -
Benetkiewicz Magdalena,
Wang Yun,
Schaner Marci,
Wang Pei,
Mantripragada Kiran K.,
Buckley Patrick G.,
Kristensen Gunnar,
BørresenDale AnneLise,
Dumanski Jan P.
Publication year - 2005
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.20128
Subject(s) - biology , copy number variation , gene , dna microarray , comparative genomic hybridization , gene dosage , microarray , ovarian carcinoma , gene expression , complementary dna , microbiology and biotechnology , ovarian cancer , gene expression profiling , genetics , chromosome , microarray analysis techniques , monosomy , cancer research , cancer , genome , karyotype
Previous low‐resolution studies of chromosome 22 in ovarian carcinoma have suggested its involvement in the development of the disease. We report a high‐resolution analysis of DNA copy number and gene expression of 22q in 18 ovarian carcinomas using a 22q‐specific genomic microarray. We identified aberrations in 67% of the studied tumors, which displayed 3 distinct gene copy number profiles. The majority of the cases (11 of 18) demonstrated heterozygous terminal deletions of various sizes, the smallest of which was 3.5 Mb. The second profile, detected in 3 tumors, revealed the coexistence of heterozygous deletions and different patterns of low‐copy‐number gain that involved the proximal half of 22q. The latter finding has not been reported previously in ovarian carcinoma. One case displayed a continuous deletion encompassing the entire 22q, consistent with monosomy 22. Furthermore, we compared the results with the available data on these tumors by using cDNA microarrays to define the degree of correlation between abnormalities at the DNA level and variation in mRNA expression. By a comparison with the expression data, we were able to identify 21 deleted genes showing low mRNA levels and 12 amplified genes displaying elevated gene expression, several of which play roles in cell cycle control and the induction of apoptosis. Our results indicated significant correlation between DNA copy number aberrations and variation in mRNA expression. We also identified several regions and candidate genes on 22q that should be studied further to determine their role in the development of ovarian cancer. © 2004 Wiley‐Liss, Inc.