title: GPX5, the selenium-independent glutathione peroxidase-encoding single copy gene is differentially expressed in mouse epididymis.
abstract: Using various molecular approaches, including reverse transcription-polymerase chain reaction (RT-PCR), rapid amplification of cDNA ends-PCR, sequencing, northern and western blotting, we found that the mouse GPX5 gene gives rise to at least three different transcripts that are not expressed at the same levels in the mouse epididymis. In addition to the major GPX5 transcript, we show that minor GPX5 transcripts exist, arising either from precocious termination of transcription or an alternative splicing event within intron 4 of the 5 exon-encoding GPX5 single copy gene. Furthermore, we demonstrate that variants of the GPX5 protein that are correlated with the shorter GPX5 transcripts can be detected in caput epididymidis protein extracts and that the various GPX5 isoforms are subject to differential post-transcriptional maturation processes in the mouse epididymis that essentially involve the addition of O-glycosyl extensions. Using a sensitive poly-A+ mRNA tissue blot, as well as RT-PCR and northern assays, we further show that in addition to being expressed in the epididymis, the GPX5 gene is also expressed, albeit at lower levels, in other tissues of the male genital tract, including the testis and prostate. Finally, we present evidence suggesting that the GPX5 gene is expressed in a temporally regulated manner during mouse embryonic development.
authors.affiliation: CNRS UMR 6247 GReD, Clermont Université, 24, Avenue des Landais, 63177 Aubiére cedex, France.
authors.forename: Ting
authors.initials: T
authors.lastname: Zhang
authors.forename: Eléonore
authors.initials: E
authors.lastname: Chabory
authors.forename: Aurore
authors.initials: A
authors.lastname: Britan
authors.forename: Elise
authors.initials: E
authors.lastname: Grignard
authors.forename: Olivier
authors.initials: O
authors.lastname: Pitiot
authors.forename: Fabrice
authors.initials: F
authors.lastname: Saez
authors.forename: Rémi
authors.initials: R
authors.lastname: Cadet
authors.forename: Joelle
authors.initials: J
authors.lastname: Henry-Berger
authors.forename: Patrick
authors.initials: P
authors.lastname: Vernet
authors.forename: Joël R
authors.initials: JR
authors.lastname: Drevet
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D004822:Epididymis / Q000196:embryology / Q000254:growth & development / Q000378:metabolism*; D018628:Gene Dosage; D018507:Gene Expression Regulation, Developmental; D005979:Glutathione Peroxidase / Q000235:genetics* / Q000378:metabolism; D008297:Male; D051379:Mice; D008969:Molecular Sequence Data; D009928:Organ Specificity / Q000235:genetics; D020033:Protein Isoforms / Q000235:genetics / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism
chemical_list: D020033:Protein Isoforms; D012333:RNA, Messenger; D005979:Glutathione Peroxidase; C080439:selenium-independent glutathione peroxidase