title: The mammalian gene pecanex 1 is differentially expressed during spermatogenesis.
abstract: Using mRNA differential display and cDNA library screening approaches we have identified differential gene expression of pecanex 1--a mammalian homologue of pecanex gene from Drosophila--in the testes of the rat. Northern blot analyses showed that the transcript is only present in the germ line and not in the somatic cells of the testis, reaching its peak at the pachytene stage of the meiotic prophase. Moreover, nonradioactive in situ hybridization did not detect the expression of the gene in any cell type of the testis other than pachytene spermatocytes. Northern blot assays did not allow the detection of the transcript in nine other tissues. Remarkably, although pecanex exerts a neurogenic role in Drosophila, the transcript was not detectable by Northern blotting in the nervous tissue of adult rats, nor in the brain of neonate and embryonal stages. The protein product of the pecanex 1 gene was detected by immunoblotting in pachytene spermatocytes and round spermatids as well, but not in liver nor brain. From genomic analysis we conclude that, although only one pecanex gene exists in Drosophila, mammalian pecanex 1 belongs to a gene family with three related genes in different chromosomes. We speculate that pecanex 1 could play an important role in the testis, related to spermatogenesis.
authors.affiliation: Unidad Asociada Biología Molecular (IIBCE), Facultad de Ciencias, Montevideo, Uruguay; Departamento de Biología Molecular, Instituto de Investigaciones Biológicas Clemente Estable, Montevideo, Uruguay. geisinge@iibce.edu.uy
authors.forename: Adriana
authors.initials: A
authors.lastname: Geisinger
authors.forename: Manfred
authors.initials: M
authors.lastname: Alsheimer
authors.forename: Andrea
authors.initials: A
authors.lastname: Baier
authors.forename: Ricardo
authors.initials: R
authors.lastname: Benavente
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Wettstein
mesh_terms: D000818:Animals; D001483:Base Sequence; D015152:Blotting, Northern; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D015870:Gene Expression; D015723:Gene Library; D015151:Immunoblotting; D017403:In Situ Hybridization; D008297:Male; D008969:Molecular Sequence Data; D051381:Rats / Q000235:genetics* / Q000378:metabolism; D017208:Rats, Wistar; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D013091:Spermatogenesis / Q000235:genetics*; D013737:Testis / Q000378:metabolism
chemical_list: D018797:Cell Cycle Proteins; C500555:Pcnx1 protein, rat