title: Alternative transcripts expressed by small bristles, the Drosophila melanogaster nxf1 gene.
abstract: The tissue-specific accumulation of small bristles (Dm nxf1) transcripts at different developmental stages of Drosophila melanogaster was analyzed by Northern blots and RT PCR. We identified four distinct transcripts: ubiquitous (3.5kb); ovary and early embryo specific (3.3kb); testis specific (1.9kb and 2.8kb) and nervous system specific (5.1kb). The pattern of Dm nxf1 gene expression in ovaries and early embryos (0-2h) is similar: the sizes of transcripts range from 3.0 to 3.5kb. We propose that this size variability may reflect the different extent of cytoplasmic polyadenylation. In testes, the 2.8-kb transcript originates from alternative termination of transcription and the 1.9-kb transcript is supposed to originate from an alternative transcription start. During ontogenesis, the 5.1-kb transcript can be clearly detected in 10- to 18-h-old embryos, most prominently in the nervous ganglia of larvae, and it represents a major species in imago head extracts. We found that the 5.1-kb transcript, similarly to the nxf1 heavy transcripts in Homo sapiens and Mus musculus, results from the retention of intron 5-6 that corresponds to the intron 10-11 in Hs nxf1 and Mm nxf1 genes.
authors.affiliation: St. Petersburg State University, Department of Genetics and Breeding, St. Petersburg, Russia.
authors.forename: Natalia
authors.initials: N
authors.lastname: Ivankova
authors.forename: Irina
authors.initials: I
authors.lastname: Tretyakova
authors.forename: George T
authors.initials: GT
authors.lastname: Lyozin
authors.forename: Elina
authors.initials: E
authors.lastname: Avanesyan
authors.forename: Andrei
authors.initials: A
authors.lastname: Zolotukhin
authors.forename: Olga G
authors.initials: OG
authors.lastname: Zatsepina
authors.forename: Michael B
authors.initials: MB
authors.lastname: Evgen'ev
authors.forename: Ludmila A
authors.initials: LA
authors.lastname: Mamon
mesh_terms: D000818:Animals; D001483:Base Sequence; D015152:Blotting, Northern; D029721:Drosophila Proteins / Q000235:genetics* / Q000378:metabolism; D004331:Drosophila melanogaster / Q000196:embryology / Q000235:genetics* / Q000378:metabolism; D004625:Embryo, Nonmammalian / Q000378:metabolism; D005260:Female; D015870:Gene Expression; D007438:Introns; D008297:Male; D008969:Molecular Sequence Data; D009687:Nuclear Proteins / Q000235:genetics* / Q000378:metabolism; D010053:Ovary / Q000196:embryology; D016601:RNA-Binding Proteins / Q000235:genetics* / Q000378:metabolism; D016415:Sequence Alignment; D013737:Testis / Q000196:embryology
chemical_list: D029721:Drosophila Proteins; D009687:Nuclear Proteins; D016601:RNA-Binding Proteins; C445086:SBR protein, Drosophila