title: Evaluation of differential gene expression in Leishmania major Friedlin procyclics and metacyclics using DNA microarray analysis.
abstract: The various Leishmania species are flagellated protozoans, responsible for a wide spectrum of human diseases. The sequence of the L. major genome is nearing completion and a large proportion of the identified genes have yet to be ascribed functions. DNA microarrays containing PCR-amplified DNA from a random amplified genomic library of L. major Friedlin (LmjF) [Mol. Biochem. Parasitol. 113 (2001) 337] were hybridized with fluorescent probes made from L. major Friedlin RNA from five time-points during differentiation from procyclics to metacyclics. The data were normalized for background and probe intensity and the relative abundance of RNA for each spot was calculated. Almost 15% (1387/9282) of the DNAs showed statistically significant (P<0.01) changes in expression (1.1-5-fold) during the transition, with 1.16% (108) showing up-regulation at two or more time-points and 0.14% (13) showing down-regulation. Northern blot analyses of selected genes confirmed these results. These studies confirmed the stage-specific expression of several known genes, as well as identifying a number of novel genes that are up-regulated in either procyclics or metacyclics.
authors.affiliation: Department of Pathobiology, Seattle Biomedical Research Institute, 4 Nickerson Street, Seattle, WA 98109-1651, USA.
authors.forename: Alka
authors.initials: A
authors.lastname: Saxena
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Worthey
authors.forename: Shaofeng
authors.initials: S
authors.lastname: Yan
authors.forename: Aaron
authors.initials: A
authors.lastname: Leland
authors.forename: Kenneth D
authors.initials: KD
authors.lastname: Stuart
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Myler
mesh_terms: D000818:Animals; D003001:Cloning, Molecular; D005453:Fluorescence; D020869:Gene Expression Profiling; D018320:Leishmania major / Q000235:genetics* / Q000254:growth & development* / Q000378:metabolism; D008018:Life Cycle Stages; D020411:Oligonucleotide Array Sequence Analysis; D012333:RNA, Messenger / Q000032:analysis / Q000378:metabolism; D015854:Up-Regulation
chemical_list: D012333:RNA, Messenger