脑胶质瘤相关新基因表达的微阵列基因芯片分析

目的用基因芯片技术获取人脑胶质瘤组织和人正常脑组织中差异表达的相关基因，并对部分基因在不同级别胶质瘤中的表达进行初步研究。方法用含有218个与人类神经系统发育相关基因的表达谱芯片，提取正常脑组织及胶质瘤组织总RNA制备探针并杂交芯片，用ScanArray4000扫描芯片，对其中差异表达基因进行生物信息学分析，并用实时定量PCR方法验证smad1、Hmp19和TRIP3的mRNA在不同级别胶质瘤中的表达改变。结果与正常脑组织相比，胶质瘤中明显差异表达基因10个，包括细胞周期相关基因、转录和细胞转导相关基因、增殖和分化相关基因。其中表达下调基因5个，表达上调基因5个，经实时定量PCR验证smad1、Hmp19和TRIP3的表达结果与芯片检测结果相符，且随胶质瘤恶性级别的不同而变化。结论胶质瘤发生发展中存在多类基因表达的改变，表达谱基因芯片技术能快速有效地反映肿瘤发展过程中的基因改变，为胶质瘤的侵袭性和预后判断提供依据以及为导向治疗和基因治疗提供更多的靶基因。

Identification of novel genes related to glioma by oligonucleotide microarray

Objective To identify the genes differentially expressed in development of human glioma, and to study the expression of some genes in different grade gliomas. Methods Oligonucleotide microarray (including 218 genes related to neural system development) was adopted and hybridized with probes which were prepared from the total RNAs of glioma specimens and normal brain tissues. Differentially expressed genes between the normal tissues and glioma tissues were assayed after scanning oligonuceltide microarray with ScanArray 4000, and some of these genes such as smad1, Hmp19 and TRIP3 were verified by real-time quantitative PCR(real-time-Q-PCR) method. Results In comparison with the genes in the normal brain tissue, 5 down-regulated and 5 up-regulated genes in glioma specimens were revealed by means of microarrays, and the expression of smad1, Hmp19 and TRIP3 were verified by real-time-Q-PCR assay. Conclusion Multiple genes play important roles in development of glioma. cDNA microarray technology is a powerful technique in screening for differentially expressed genes between glioma tissues and normal brain tissues. This study is helpful for judgement of invasion and prognosis of gliomas, and provides more target genes for targeted therapy.