中文摘要：

本研究克隆了水牛脑源性神经营养因子（brain-derived neurotrophic factor，BDNF）基因序列，并运用生物信息学方法对序列的同源性、生物进化树、蛋白的理化性质及二、三级结构等进行了分析预测，同时利用QRT—PCR方法研究了BDNF mRNA在胎儿水牛及成年水牛不同组织中的表达情况。结果表明，应用RTPCR技术克隆获得了长800bp水牛BDNF基因序列，其中编码区全长753bp，编码250个氨基酸。多重序列比对分析显示，水牛BDNF核苷酸序列与黄牛、野猪、犬、人、马、小鼠同源性分别为99％、94％、93％、90％、90％和89％；生物进化树分析显示，BDNF基因在不同物种进化过程中具有较高的保守性；BDNF蛋白理论分子质量28173．36U，等电点9．12；蛋白二级结构由多个α螺旋、β-折叠、T-转角及无规则卷曲组成，三级结构由多个α-螺旋、3对反向平行的β-折叠结构等构成活性中心（即NGF功能结构域）。QRT-PCR结果显示，BDNF mRNA在胎儿水牛及成年水牛的心脏、肺脏、肾脏、大脑、肌肉、卵巢、睾丸组织中都有表达，且成年水牛的表达量高于胎儿水牛。

英文摘要：

In this study,the CDS sequence of buffalo BDNF gene was cloned,and then the homology, evolutive tree of BDNF amino acid sequence and the physicochemical characteristics, secondary and tertiary structures of BDNF protein were analyzed and predicted by bioinformatics techniques,also,the expression pattern of BDNF mRNA in different tissues of fetal and adult buffalo was investigated by QRT-PCR. The results showed that with RT-PCR a 800 bp buffalo BDNF gene fragment was cloned and sequenced,including the whole CDS of 753 bp （coded 250 amino acid）. The multiple sequence alignment result showed that, the BDNF gene in buffalo shared 99%,94%,93%,90%,90% and 89% similar nucleotide sequence with that of Bos taurus,Sus scro f a ,Canis lupus f amiliaris , Homo sapiens, Equus caballus and Mus musculus , respectively. The evolutive tree analysis showed that BDNF gene was highly conservative in evolution. The molecular weight and isoeleetric point of BDNF protein were predicted as 28 173.36 u and 9.12,respectively. The secondary structure of BDNF protein was composed of several a-helix,l-sheet, T-turn and randon coil structures, and the tertiary structure of BDNF protein was composed of several a-helix and 3 pairs of antiparallel β-sheet structures and so on,which configuring an active center aslo called the NGF functional domain. The QRT-PCR result showed that BDNF mRNA completely expressed in heart, lung, kidney, brain, muscle, ovary and testis in both of fetal and adult buffalo,but the mRNA expression in adult buffalo was higher than that of fetal buffalo.