Analysis of comparative genomic hybridization and loss of heterozygosity in 43 primary gastric carcinomas.
OBJECTIVE
To investigate common chromosomal changes and the LOH frequency of microsatellite loci in primary gastric cancer samples in order to locate the deleted regions in which human gastric cancer related genes might exist.


METHODS
Comparative genomic hybridization (CGH) was used to define global chromosomal aberrations in 43 primary gastric tumors. Based on the results of CGH, analysis of loss of heterozygosity (LOH) was performed in chromosome 19 in which the loss was first discovered in the gastric cancers. The PCR-based approach was used to investigate 22 loci, which are spaced at 1.1 - 10.9 cM intervals throughout chromosome 19. The amplified PCR fragments were subjected to electrophoresis in PAGE gel and analyzed with Genescan trade mark and Genotyper trade mark.


RESULTS
CGH analysis revealed gains in chromosome 3p (8/43), 8q (8/43), 20 [20 (9/43), 20p (7/43), 20q (4/43)], 12q (16/43), 13q (12/43) and losses in 19 [19 (15/43)], 7 [17 (8/43), 17p (10/43)], 16 (10/43) and 1p (11/43). Among the 43 evaluated samples, the most frequent LOH was detected at locus D19S571 (27.81%).


CONCLUSIONS
The tumorigenesis of gastric cancer includes several chromosomal changes. The aberration of chromosome 19 was the first common change founded in gastric cancer. The region near the D19S571 might harbor potential genes related to the tumorigenesis of gastric cancer.
Wang
Qi
Q
Laboratory of Medical Genetics, Department of Biology, Harbin Medical University, Harbin 150086, China.
Wang
Baiqiu
B
Guan
Xinyuan
X
Gao
Hui
H
Cheng
Hui
H
Zhang
Qifan
Q
Huang
Chengbin
C
Li
Pu
P
Fu
Songbin
S
D002888:Chromosomes, Human, Pair 19; D006801:Humans; D019656:Loss of Heterozygosity; D009693:Nucleic Acid Hybridization; D010580:Peutz-Jeghers Syndrome / Q000235:genetics; D013274:Stomach Neoplasms / Q000235:genetics*