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  • Cell & Developmental Biology  (1)
  • Sparus aurata  (1)
Publikationsart
Verlag/Herausgeber
Erscheinungszeitraum
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Fish physiology and biochemistry 11 (1993), S. 345-352 
    ISSN: 1573-5168
    Schlagwort(e): growth hormone gene ; all-fish genes ; transgenic fish ; cell line transfection ; Sparus aurata
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Beschreibung / Inhaltsverzeichnis: Abstract In order to develop all-fish expression vectors for microinjection into fertilized fish eggs, we have prepared the following constructs: rainbow trout metallothionein a/b and the gilthead seabream growth hormone cDNA (ptMTa-gbsGHcDNA, ptMTb-gsbGHcDNA), carp β-actin gilthead seabream GH cDNA (pcAβ-gsbGHcDNA). The inducible metallothionein promoters a and b were cloned from rainbow trout, and the constitutive promoter β-actin was isolated from carp. The metallothionein promoters were cloned by using the PCR technique. The tMTa contains 430 bp, while the tMTb contains 260 bp (Hong et al. 1992). These two promoters were introduced to pGEM-3Z containing the GH cDNA of Sparus aurata to form ptMTa-gsbGH and ptMTb-gsbGH, respectively. The carp cytoplasmic β-actin gene was chosen as a source for isolating strong constitutive regulatory sequences. One of these regulatory sequences in pUC118 was ligated to GH cDNA of S. aurata to form the pcAβ-gsbGHcDNA. Expression of the constructs containing the metallothionein promoters was tested in fish cell culture and was found to be induced effectively by zinc. The ptMTa gsb-GH cDNA construct was microinjected into fertilized carp eggs, and integration in the genome of carp was detected in the DNA isolated from fins at the age of two months.
    Notizen: Résumé Afin de développer des vecteurs d'expression de poisson, entièrement homologues, destinés aux microinjections dans des oeufs fertilisés, les constructions suivantes ont été préparées: promoteurs de la metallothionine, a ou b, de truite arc-en-ciel d'une part, et promoteur de l'actine β de carpe d'autre part, associés à l'ADNc de l'hormone de croissance de daurade royale (ptMTa-gsbGH cDNA, ptMTb-gsbGH cDNA, et pcAβ-gsbGH cDNA). Les promoteurs de la metallothionine ont été clonés en utilisant la technique de la RCP. La tMTa comprend 430 pb. tandis que la tMTb en comprend 260 (Hong et al. 1992). Ces deux promoteurs ont été insérés dans pGEM-3Z qui contenait l'ADNc de GH de Sparus aurata, pour former, respectivement, ptMTa-gsbGH et ptMTb-gsbGH. Le gène de l'actine cytoplasmique β de carpe été choisi comme source d'isolement de séquences régulatrices fortement constitutives. Une de ces séquences régulatrices a été liguée à l'ADNc de GH de S. aurata dans pUC118, pour réaliser la construction pcAβ-gsbGH cDNA. L'expression des constructions contenant les promoteurs de la metallothionine a été tentée dans des cultures de cellules de poisson, où elle a été effectivement induite par le zinc. La construction ptMTa-gsbGH cDNA a été microinjectée dans des oeufs fertilisés de carpe. Son intégration dans le génome de carpe a pu être détectée dans l'ADN isolé à partir de nageoires d'animaux agés de 2 mois.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Gamete Research 14 (1986), S. 293-306 
    ISSN: 0148-7280
    Schlagwort(e): fertilization ; proteolysis ; nuclear proteins ; Life and Medical Sciences ; Cell & Developmental Biology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: Spermatogenesis in the male rat involves chemical and physical transformation of chromatin. There is a shift in the chemical composition of rat testicular sperm chromatin containing histones to nucleoprotamines in the mature sperm. Rat protamine contains a high percentage of arginine. The biosynthesis and kinetics of H3-arginine incorporation into rat sperm protamine was at its peak in the testis 2 days after intratesticular injection. The specific activity of protamine in the testis was reduced to 50% 5 days after injection. Specific activity of protamine in the epididymis was maximal at 9 days after injection and remained at a similar level for 12 days. The kinetics of H3-arginine and H3-thymidine in ejaculated sperm were compared. It was found that maximal specific activity of H3-arginine (H3-Arg/No. of sperm) in the spermatozoa was obtained 20-22 days following its intratesticular injection. The peak of H3-thymidine specific activity (H3-thymidine/No. of sperm) was obtained 53-59 days following the injection.H3-Arg labeled sperm were capacitated in vitro and were allowed to penetrate zona free rat eggs in vitro. The disappearance of the label from the sperm head was observed 1-2 hr after penetration. Protamine labeled in vitro with I125 incubated with extracts of freshly ovulated rat eggs shows that protamine could be degraded by the cytoplasmic extract (10-30%). The proteolytic activity is maximal at pH 7.0-8.0. Cytoplasmic extracts from cumulus cells incubated with I125 rat protamine under identical conditions did not show any significant proteolytic activity. Trypsin degradation of rat protamine shows a different pattern of degradation. It is assumed that the H3-labeled protamine in the sperm chromatin is removed and probably degraded early after penetration, making possible the remodeling of the sperm chromatin by embryonic histones.
    Zusätzliches Material: 8 Ill.
    Materialart: Digitale Medien
    Standort Signatur Einschränkungen Verfügbarkeit
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