title: A cDNA microarray, UniShrimpChip, for identification of genes relevant to testicular development in the black tiger shrimp (Penaeus monodon).
abstract: BACKGROUND
  Poor reproductive maturation in captive male broodstock of the black tiger shrimp (Penaeus monodon) is one of the serious problems to the farming industries. Without genome sequence, EST libraries of P. monodon were previously constructed to identify transcripts with important biological functions. In this study, a new version of cDNA microarray, UniShrimpChip, was constructed from the Peneaus monodon EST libraries of 12 tissues, containing 5,568 non-redundant cDNA clones from 10,536 unique cDNA in the P. monodon EST database. UniShrimpChip was used to study testicular development by comparing gene expression levels of wild brooders from the West and East coasts of Thailand and domesticated brooders with different ages (10-, 14-, 18-month-old).
  
  
  RESULTS
  The overall gene expression patterns from the microarray experiments revealed distinct transcriptomic patterns between the wild and domesticated groups. Moreover, differentially expressed genes from the microarray comparisons were identified, and the expression patterns of eight selected transcripts were subsequently confirmed by reverse-transcriptase quantitative PCR (RT-qPCR). Among these, expression levels of six subunits (CSN2, 4, 5, 6, 7a, and 8) of the COP9 signalosome (CSN) gene family in wild and different ages of domesticated brooders were examined by RT-qPCR. Among the six subunits, CSN5 and CSN6 were most highly expressed in wild brooders and least expressed in the 18-month-old domesticated group; therefore, their full-length cDNA sequences were characterized.
  
  
  CONCLUSIONS
  This study is the first report to employ cDNA microarray to study testicular development in the black tiger shrimp. We show that there are obvious differences between the wild and domesticated shrimp at the transcriptomic level. Furthermore, our study is the first to investigate the feasibility that the CSN gene family might have involved in reproduction and development of this economically important species.
authors.affiliation: National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Klong 1, Klong Luang, Pathumthani 12120, Thailand.
authors.forename: Rungnapa
authors.initials: R
authors.lastname: Leelatanawit
authors.forename: Umaporn
authors.initials: U
authors.lastname: Uawisetwathana
authors.forename: Sirawut
authors.initials: S
authors.lastname: Klinbunga
authors.forename: Nitsara
authors.initials: N
authors.lastname: Karoonuthaisiri
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000075686:COP9 Signalosome Complex; D016000:Cluster Analysis; D020869:Gene Expression Profiling / Q000379:methods*; D008297:Male; D008969:Molecular Sequence Data; D046912:Multiprotein Complexes / Q000235:genetics / Q000378:metabolism; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D033561:Penaeidae / Q000235:genetics*; D010447:Peptide Hydrolases / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013737:Testis / Q000254:growth & development / Q000378:metabolism*
chemical_list: D046912:Multiprotein Complexes; D010447:Peptide Hydrolases; D000075686:COP9 Signalosome Complex