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  • Author: Dariusz Kaczmarczyk x
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Dariusz Kaczmarczyk

Abstract

The American paddlefish, Polyodon spathula (Walbaum), is an endangered acipenserid fish. Its wild populations are supplemented with stocking material that is obtained by conducting artificial spawning in aquaculture conditions. When fish are bred in captivity, it is important to select breeding pairs that will produce the most genetically diverse progeny, since this permits maintaining the fitness of wild populations. Breeding pairs of land animals are selected successfully based on the polymorphism of their microsatellite loci. This theoretical paper asks how to adapt this technique to fish so that American paddlefish spawners can be paired with the aim of producing restocking material in aquaculture that maintains genetic variation. To test our calculating techniques, we used actual data on the polymorphism of the microsatellites from paddlefish broodstock at the Pogorze fish farm (Poland). The data enabled us to do calculations that showed which spawner pairs would create the most genetically diverse offspring and how to assemble sets of spawning pairs that would be best for maintaining genetic variation. The method presented in this paper can be used for breeding fish in aquaculture to help conserve species. It could also be used in a computer program which would automate calculations and present them in easy-to-read tables and graphs.

Open access

Alicja Stachura, Barbara Bojarojć-Nosowicz, Dariusz Kaczmarczyk and Ewa Kaczmarczyk

Abstract

Introduction: Numerous mutations in the bovine tumour necrosis factor receptor type two (TNF-RII) gene have been identified, but their biological consequences remain poorly understood. The aim of this study was to determine whether polymorphism in the analysed loci of the bovine TNF-RII gene is linked with the size of cell subpopulations naturally infected with bovine leukaemia virus (BLV) which serve important immune functions in the host. Material and Methods: Samples originated from 78 cows. Polymorphisms in the studied gene were determined by PCR-RFLP and DNA sequencing by capillary electrophoresis. BLV infection was diagnosed by the immunofluorescence (IMF) technique and nested PCR. Cell subpopulations were immunophenotyped with IMF. Results: Similar and non-significant differences in the average percentages of TNFα+, IgM+TNFα+, and CD11b+TNFα+ cells infected with BLV were noted in individuals with various genotypes in the polymorphic sites g.-1646T > G and g.16534T > C of the TNF-RII gene, and significant differences in the percentages of these subpopulations were observed between selected microsatellite genotypes (g.16512CA(n)). Conclusion: STR polymorphism and the number of CA dinucleotide repeats in intron 1 of the TNF-RII gene influence the frequency of TNF+, CD11b+TNF+, and IgM+TNF+ subpopulations naturally infected with BLV. Polymorphism in the gene’s other two sites do not affect the size of these cell subpopulations.