Genome-wide survey for chromosomal imbalances in ganglioglioma using comparative genomic hybridization.
Ganglioglioma is a mixed neuronal and glial tumor first described by Perkin in 1926. Because of its rare occurrence in the central nervous system, the pathogenesis of this neoplasm is still largely unknown. Previous studies of ganglioglioma mainly focused on histologic features, immunohistochemical analysis, clinical treatment, and patient outcome. Very few cytogenetic and molecular genetic studies have been reported on this neoplasm. To better understand the mechanism underlying the development of ganglioglioma, we performed comparative genomic hybridization analysis to investigate chromosomal imbalances across the entire genome in five cases of gangliogliomas. Loss of genetic material on the short arm of chromosome 9 was a common genetic alteration found in three of five cases. Overrepresentation of partial or the whole chromosome 7 was another recurrent chromosomal imbalance, confirmed by fluorescence in situ hybridization. Immunohistochemical analysis was performed; all five cases revealed no reaction or low expression for epidermal growth factor receptor antibody. Our study highlights chromosomal regions for further fine mapping and investigation of candidate tumor suppressor genes involved in the pathogenesis of ganglioglioma.
Yin
Xiao Lu
XL
Department of Anatomical and Cellular Pathology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong, China.
Hui
Angela Bik-Yu
AB
Pang
Jesse Chung-Sean
JC
Poon
Wai Sang
WS
Ng
Ho Keung
HK
D000293:Adolescent; D000328:Adult; D001932:Brain Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D002869:Chromosome Aberrations; D002897:Chromosomes, Human, Pair 7 / Q000235:genetics; D066246:ErbB Receptors / Q000032:analysis; D005260:Female; D018303:Ganglioglioma / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D015894:Genome, Human; D006801:Humans; D007150:Immunohistochemistry; D017404:In Situ Hybridization, Fluorescence; D008297:Male; D009693:Nucleic Acid Hybridization / Q000379:methods*
D066246:ErbB Receptors