EST analysis of cDNA libraries from the entomopathogenic fungus Beauveria (Cordyceps) bassiana.: I.: Evidence for stage-specific gene expression in aerial conidia, in vitro blastospores and submerged conidia

被引:70
作者
Cho, Eun-Min
Liu, Li
Farmerie, William
Keyhani, Nemat O. [1 ]
机构
[1] Univ Florida, Dept Microbiol & Cell Sci, Gainesville, FL 32611 USA
[2] Univ Florida, Interdisciplinary Ctr Biotechnol Res, Gainesville, FL 32611 USA
来源
MICROBIOLOGY-SGM | 2006年 / 152卷
关键词
D O I
10.1099/mic.0.28844-0
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
The entomopathogenic fungus Beauveria (Cordyceps) bassiana holds much promise as a pest biological control agent. B. bassiana produces at least three in vitro single cell infectious propagules, including aerial conidia, vegetative cells termed blastospores and submerged conidia, that display different morphological, biochemical and virulence properties. Populations of aerial conidia, blastospores and submerged conidia were produced on agar plates, rich liquid broth cultures and under conditions of nutrient limitation in submerged cultures, respectively. cDNA libraries were generated from mRNA isolated from each B. bassiana cell type and similar to 2500 5' end sequences were determined from each library. Sequences derived from aerial conidia clustered into 284 contigs and 963 singlets, with those derived from blastospores and submerged conidia forming 327 contigs with 788 singlets, and 303 contigs and 1079 contigs, respectively. Almost half (40-45%) of the sequences in each library displayed either no significant similarity (e value > 10(-4)) or similarity to hypothetical proteins found in the NCBI database. The expressed sequence tag dataset also included sequences representing a significant portion of proteins in cellular metabolism, information storage and processing, transport and cell processes, including cell division and posttranslational modifications. Transcripts encoding a diverse array of pathogenicity-related genes, including proteases, lipases, esterases, phosphatases and enzymes producing toxic secondary metabolites, were also identified. Comparative analysis between the libraries identified 2416 unique sequences, of which 20-30% were unique to each library, and only similar to 6% of the sequences were shared between all three libraries. The unique and divergent representation of the B. bassiana transcriptome in the cDNA libraries from each cell type suggests robust differential gene expression profiles in response to environmental conditions.
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收藏
页码:2843 / 2854
页数:12
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