中国寄生虫学与寄生虫病杂志 ›› 2008, Vol. 26 ›› Issue (3): 7-190.

• 论著 • 上一篇    下一篇

家蝇生长发育各阶段抗菌肽基因表达情况的研究

金小宝1,2,王艳1,朱家勇1 *,马艳1,楮夫江1,杨小蓉1
  

  1. 1 广东药学院基础学院,广州 510006;2 南方医科大学公共卫生与热带医学学院,广州 510515
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2008-06-30 发布日期:2008-06-30

Expression Analysis of Antibacterial Peptide Genes at Different Development Stages of Musca domestica

JIN Xiao-bao1,2,WANG Yan1,ZHU Jia-yong1 *,MA Yan1,CHU Fu-jiang1,YANG Xiao-rong1
  

  1. 1 Department of Parasitology, Guangdong Pharmaceutical University, Guangzhou 510006, China;2 School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou 510515, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2008-06-30 Published:2008-06-30

摘要: 目的 从基因角度分析家蝇生长发育各阶段抗菌肽的表达情况。 方法 制备家蝇卵以及Ⅰ龄、Ⅱ龄、Ⅲ龄幼虫、蛹和成虫等6个生长阶段的总RNA,采用半定量RT-PCR技术,以磷酸甘油醛脱氢酶(GADPH)基因作为内参照,根据GenBank公布的家蝇抗菌肽基因-天蚕素(cecropin)基因、防御素(defensin)基因和攻击素(attacin)基因的核苷酸序列设计特异性引物进行RT-PCR扩增,分析家蝇生长发育各阶段抗菌肽基因mRNA表达量。 结果 上述6个生长发育阶段均检测到cecropin、defensin和attacin等3种抗菌肽基因的表达,分别在210、300和650 bp出现一条带,与其理论值相符。其中Ⅲ龄幼虫期和成虫期抗菌肽基因mRNA的表达量最高(3种抗菌肽基因电泳图谱扫描光密度与内参基因GAPDH光密度的比值分别为1.61、1.99和1.62,1.47、1.92和1.59),卵期、Ⅰ龄幼虫期和蛹期表达量相对较低(3种抗菌肽基因电泳图谱扫描光密度与内参基因GAPDH光密度的比值分别为0.49、0.49和0.42,0.72、0.49和0.64,0.65、0.39和0.91)。 结论 家蝇抗菌肽基因在不同发育阶段均普遍表达,但表达水平存在明显差异。

关键词: 家蝇, 抗菌肽, 基因表达, RT-PCR

Abstract: Objective To explore the expression level of antibacterial peptide genes at the different development stages of Musca domestica. Methods Total RNA was extracted from eggs, 1st instar larvae, 2nd instar larvae, 3rd instar larvae, pupae and adults of M. domestica. After the primers for antibacterial peptide (cecropin, defensin and attacin) genes and GAPDH were designed respectively according to the reported M. domestica gene sequences in GenBank, semi-quantitative RT-PCR was performed to detect expression level of these genes in the development stages of M. dome-stica using GAPDH as inner control. Results The antibacterial peptide genes were detected with bands of 210 bp, 300 bp and 650 bp at all development stages of M. domestica. The expression level in the 3rd instar larvae and adults were higher, with a band value of cecropin, defensin and attacin in relation to GAPDH of 1.61, 1.99, 1.62 and 1.47, 1.92, 1.59, respectively; while it was lower at eggs, 1st instar larvae and pupae with a band value of cecropin, defensin and attacin 0.49, 0.49, 0.42 and 0.72, 0.49, 0.64 and 0.65, 0.39, 0.91, respectively. Conclusion The antibacterial peptide genes express at all development stages of M. domestica with an evidently different expression level.

Key words: Musca domestica, Antibacterial peptide, Gene expression, RT-PCR