title: Nucleotide sequence and transcription of a trypomastigote surface antigen gene of Trypanosoma cruzi.
abstract: In previous studies we identified a 500-bp segment of the gene, TSA-1, which encodes an 85-kDa trypomastigote-specific surface antigen of the Peru strain of Trypanosoma cruzi. TSA-1 was shown to be located at a telomeric site and to contain a 27-bp tandem repeat unit within the coding region. This repeat unit defines a discrete subset of a multigene family and places the TSA-1 gene within this subset. In this study, we present the complete nucleotide sequence of the TSA-1 gene from the Peru strain. By homology matrix analysis, fragments of two other trypomastigote specific surface antigen genes, pTt34 and SA85-1.1, are shown to have extensive sequence homology with TSA-1 indicating that these genes are members of the same gene family as TSA-1. The TSA-1 subfamily was also found to be active in two other strains of T. cruzi, one of which contains multiple telomeric members and one of which contains a single non-telomeric member, suggesting that transcription is not necessarily dependent on the gene being located at a telomeric site. Also, while some of the sequences found in this gene family are present in 2 size classes of poly(A)+ RNA, others appear to be restricted to only 1 of the 2 RNA classes.
authors.affiliation: Department of Molecular Biology and Biochemistry, University of California, Irvine 92717.
authors.forename: D L
authors.initials: DL
authors.lastname: Fouts
authors.forename: B J
authors.initials: BJ
authors.lastname: Ruef
authors.forename: P T
authors.initials: PT
authors.lastname: Ridley
authors.forename: R A
authors.initials: RA
authors.lastname: Wrightsman
authors.forename: D S
authors.initials: DS
authors.lastname: Peterson
authors.forename: J E
authors.initials: JE
authors.lastname: Manning
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000953:Antigens, Protozoan / Q000235:genetics* / Q000276:immunology; D000954:Antigens, Surface / Q000235:genetics* / Q000276:immunology; D001483:Base Sequence; D015152:Blotting, Northern; D015139:Blotting, Southern; D004706:Endodeoxyribonucleases / Q000378:metabolism; D015870:Gene Expression; D008969:Molecular Sequence Data; D005810:Multigene Family; D009693:Nucleic Acid Hybridization; D011061:Poly A / Q000235:genetics; D012313:RNA / Q000235:genetics; D012333:RNA, Messenger; D016053:RNA, Protozoan / Q000235:genetics; D012689:Sequence Homology, Nucleic Acid; D014158:Transcription, Genetic; D014349:Trypanosoma cruzi / Q000235:genetics* / Q000276:immunology / Q000378:metabolism; D014643:Variant Surface Glycoproteins, Trypanosoma
chemical_list: D000953:Antigens, Protozoan; D000954:Antigens, Surface; D012333:RNA, Messenger; D016053:RNA, Protozoan; D014643:Variant Surface Glycoproteins, Trypanosoma; C070842:trypomastigote specific surface antigen; D011061:Poly A; D012313:RNA; D004706:Endodeoxyribonucleases; C038407:exonuclease Bal 31