cDNA libraries were generated from cells in either the conjugative or vegetative stages of the life cycle. For the conjugative library, cells from a mating between strains CU428 and B2086 were harvested at 3, 6, and 10 h after mixing, and RNA was purified using TRIzol. PolyA+ RNA was isolated and cDNA was generated by Amplicon Express (Pullman, Washington, United States). Inserts were cloned into EcoRI and XhoI sites in pBluescript IISK+ (Stratagene, La Jolla, California, United States) and had an average size of 1.4 kb. Clones were picked at random and sequenced from the 5′ end of the transcript using the T3 primer. For the vegetative library, which was made by DNA Technologies (Gaithersburg, Maryland, United States), CU428 cells were harvested in exponential growth and RNA was purified using TRIzol. PolyA+ mRNA was isolated using oligo(dT) cellulose, cDNA was generated, and inserts were cloned into the EcoRV and NotI sites of the pcDNA3.1(+) vector (Invitrogen). Clones were picked at random and sequenced from the 5′ end using the custom pcDNA(−48) primer. All sequences were submitted to the dbEST division of GenBank, to the Taxonomically Broad EST Database (TBestDB) at http://tbestdb.bcm.umontreal.ca/searches/login.php , and to TIGR's Tetrahymena Gene Index at http://www.tigr.org/tigr-scripts/tgi/T_index.cgi?species=t_thermophila . Subsequent analyses used comparisons of the conjugative sequences with all vegetative sequences including those in GenBank not generated at TIGR.
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