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蚊媒感染疟原虫后应答性表达增高基因的富集和筛选 被引量:7

Enrichment and Screening of Up-regulated Genes of the Mosquito Anopheles stephensi in Response to Malaria Parasite
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摘要 目的 分离和识别蚊媒疟原虫感染相关基因并探讨其机制。方法 以斯氏按蚊 约氏疟原虫为实验模型 ,分别将刺叮约氏疟原虫感染鼠血和正常鼠血后 2 4h的饱血斯氏按蚊作为T组和D组 ,经抑制性差减杂交和选择性PCR扩增 ,建立一个T组表达特异增高基因的差减cDNA库。将此差减库分别与T组和D组的cDNAs混合探针作斑点杂交 ,筛选出差异表达基因 ,测定其序列并做基因库BLAST搜索。结果 T组相对于D组的差异表达基因得到有效富集 ,5 8个重组克隆中有 2 4个表达增高 ,阳性率为 4 1.4 %。所代表的 2 3个基因搜索结果显示 ,12个与功能已知的基因同源 ,4个与功能未知的基因同源 ,7个为新发现的基因 ;其中 9个与LPS诱导的冈比亚按蚊免疫反应性细胞系EST同源 ,占 39.1% (9/ 2 3)。结论 建立了蚊媒感染疟原虫早期 (2 4h)直接导致的全基因组应答性表达增高cDNA库 ,筛选结果显示蚊虫对疟原虫感染的反应涉及多种生化途径及机制 。 Objective To isolate and identify genes related to malaria parasite infection in vector mosquito, and to explore the mechanisms. Methods Anopheles stephensi infected with Plasmodium yoelii was used as tester (T) group, while uninfected but normal blood fed as driver (D) one. Engorged female mosquitoes of two groups were collected separately at 24 hours after biting. An enriched subtractive cDNA pool was generated through the course of suppression subtractive hybridization (SSH) and selective PCR amplification. The subtracted library was screened by hybridization using T and D cDNA mixture as probes, respectively. The positive clones, which produced stronger signal when probed with T than with D, were sequenced and their sequence homologues in GenBank database were searched with BLAST by internet. Results The analysis of subtraction efficiency showed that the differentially expressed genes in T comparing to in D were enriched significantly. In dot blot screening, 24 of 58 randomly selected clones (41.4%) were shown up regulation in malaria infected mosquitoes. The BLAST search of 23 genes revealed that 12 were homologous to functionally known genes, 4 were homologous to functionally unknown entries, and 7 were novel without any relatives. Nine of the 23 genes (39.1%) also hit homologous sequences in the An. gambiae EST database generated from an immune competent cell line treated with lipopolysaccharide (LPS). Conclusion An enriched cDNA pool of the mosquito genes which up regulated responsively at the early stage of malaria parasite infection was obtained. Expression screening against the pool indicated that various biochemical processes and mechanisms might be involved in the response of mosquito to parasite infection, especially those related with the innate immune system and energy metabolism.
出处 《中国寄生虫学与寄生虫病杂志》 CAS CSCD 北大核心 2001年第6期325-329,共5页 Chinese Journal of Parasitology and Parasitic Diseases
基金 国家自然科学基金(No .3 95 70 64 8)~~
关键词 斯氏按蚊 约氏疟原虫 差异表达基因 疟疾 Anopheles stephensi, Plasmodium yoelii, differentially expressed gene
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