|
KMID : 0545120050150051060
|
|
Journal of Microbiology and Biotechnology
2005 Volume.15 No. 5 p.1060 ~ p.1066
|
|
|
Gene Expression Profiling of Eukaryotic Microalga, Haematococcus pluvialis
|
|
Eom HS
Park SH/Lee CG/Jin ES
|
|
|
Abstract
|
|
|
|
Under environmental stress such as strong irradiance or nitrogen deficiency, unicellular green algae of the genus Haematococcus accumulate secondary carotenoids, i.e. astaxanthin, in the cytosol. The induction and regulation of astaxanthin biosynthesis in microalgae has recently received considerable attention owing to the increasing use of secondary carotenoids as a source of pigmentation for fish aquacultures, and as a potential drug in cancer prevention as a free-radical quencher. Accordingly, this study generated expressed sequence tags (ESTs) from a library constructed from astaxanthin-induced Haematococcus pluvialis. Partial sequences were obtained from the 5 ends of 1,858 individual cDNAs, and then grouped into 1,025 non-overlapping sequences, among which 708 sequences were singletons, while the remainder fell into 317 clusters. Approximately 63% of the EST sequences showed similarity to previously described sequences in public databases. H. pluvialis was found to consist of a relatively high percentage of genes involved in genetic information processing (15%) and metabolism (11%) whereas a relatively low percentage of sequences was involved in the signal transduction (3%), structure (2%) and environmental information process (3%). In addition, a relatively large fraction of H. pluvialis sequences was classified as genes involved in photosynthesis (9%) and cellular process (9%). Based on this EST analysis, the fulllength cDNA sequence for superoxide dismutase (SOD) of H. pluvialis was cloned, and the expression of this gene was investigated. The abundance of SOD changed substantially in response to different culture conditions, indicating the possible regulation of this gene in H. pluvialis.
|
|
|
KEYWORD
|
|
|
|
|
|
FullTexts / Linksout information
|
|
|
|
|
|
Listed journal information
|
|
  
|
|