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Divergence on Gene Expression Responding to Microbial Challenge and the Evolution of the Drosomycin Gene Family in Drosophila melanogaster

Divergence on Gene Expression Responding to Microbial Challe...

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中国蚕学会第六届青年学术研讨会

作者： DENG Xiao-Juan 1,2,YANG Wan-Ying 2,HUANG Ya-Dong3,CAO Yang2,WEN Shuo-Yang 4,XU Pei-Lin 1,XIA Qing-You 5 (1 The Key Laboratory of Gene Engineering of Ministry of Education,Sun Yat-sen University,Guangzhou 510275,China 2 Department of Sericulture Science,College of Animal Science,South China Agricultural University,Guangzhou 510642,China 3 Biopharmaceutical Research and Development Center,Jinan University,Guangzhou 510632,China 4 Department of Entomology,College of Natural Resource and Environment,South China Agricultural University,Guangzhou 510642,China 5 Key Sericultural Laboratory of Agriculture Ministry,College of Sericulture and Biotechnology,Southwest University,Chongqing 400716,China)

Drosomycin（Drs） encodes an inducible 44-residue of antifungal peptide in Drosophila melanogaster. Additional six genes,Dro1,Dro2,Dor3,Dro4,Dro5 and Dro6,are clustered with Drs into a multi-gene family on the 3L chromosome arm. To understand how does each gene of the family respond to microbial infection,we investigated the expression pattern of the drosomycin gene family by microbe-free injury and the microbial challenge. Among these seven genes,Drs,Dro2,Dro3,Dro4 and Dro5,were constitutionally expressed. Dro2,Dro3 and Dro5 were up-regulated by the simple injury. Only the Drs was strongly up-regulated by infection of microbes. Nevertheless Dro1 and Dro6 were not transcribed at all. Furthermore,two transcription start sites of Drs and Dro2,each of Dro3,Dro4 and Dro5,were identified by rapid amplification of cDNA ends. The presence of the NF-κB binding sites in regulatory region of Drs,Dro2,Dro3 and Dro5 genes also indicated the importance of these sites for the inducibility of Drs,Dro2,Dro3 and Dro5 gene. Taking the nested phylogenic information of ORFs into account,we suggested that genes of the drosomycin family have evolved into quite divergent against various stimulations during three duplication events.

关键词： drosomycins Antifungal peptide Transcription Regulatory motifs Drosophila melanogaster

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