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Prevalence and biological consequence of chromosomally integrated human herpesvirus 6 (HHV-6) in Czech population
Hrdličková, Alena ; Hubáček, Petr (advisor) ; Lengerová, Martina (referee)
8 Abstract Human Herpes Virus 6 (HHV-6) consists of two closely related DNA viruses: HHV-6A and HHV-6B. The primoinfection proceeds at an early childhood usually as sixth exanthem disease or without any clinical symptoms. Both HHV-6 viruses are able to integrate to human genome using recombinant mechanisms which is unique compared to other human herpesviruses. The aim of the thesis is to study Ci-HHV-6 in a group of patients with malign disease and in the healthy population. We analysed 812 patients with malign disease and 420 healthy subjects from general population. The Ci-HHV-6 was assessed by real-time PCR, the specific localization of Ci-HHV-6 was determined using fluorescent in situ hybridization (FISH). Using comparative study, we did not identify significant difference between frequency of Ci-HHV-6 in patients with malign disease (1.11%) and healthy subjects (0.95%) (P-value 0.8). Consequently, we proved the heritability of Ci-HHV-6 in affected families. We determined the localization of Ci-HHV-6 to telomeric regions of chromosomes 2 and 18. We studied the production of viral proteins in the subjects with Ci-HHV-6. In this work, we conducted the first epidemiological study of Ci-HHV-6 in the Czech Republic. We also introduced novel methods which contribute to better characterization of this phenomenom.
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Structure and evolution of plant sex chromosomes: The use of BAC library
Kejnovský, Eduard ; Lengerová, Martina ; Hobza, Roman ; Široký, Jiří ; Vyskot, Boris
Sex chromosomes of plant species Silene latifolia are the ideal model for evolutionary biology studies because they represent early stages of X and Y chromosomes history. We used fluorescence in situ hybridization (FISH) with bacterial artificial chromosome (BAC) clones in studies of chromosome structure to demonstrate that a majority of genes are located in subtelomeric regions of all chromosomes. Our results also indicate the absence of accumulation of main classes of repetitive sequences - retroelements and centromeric tandem repeats - in non-recombining parts of the sex chromosomes.
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Genetic and epigenetic acpects of sex determination
Janoušek, Bohuslav ; Hodurková, Jaromíra ; Žlůvová, Jitka ; Lengerová, Martina ; Hobza, Roman ; Nix, Tomáš ; Vyskot, Boris
The article concentrates on the latest knowledge concerning the role of epigenetic mechanisms in sex determination in model dioecious species Silene latifolia. Results suggest that the locus suppressing development of female organs in male plants is hypersensitive to the action of agents influencing level of DNA methylation (5-azacytidine) and histone acetylation (trichostatin A). According to the results obtained via inter-specific hybridisation and the ability of the smut Ustilago violacea to activate development of male organs in female plants, it can be deduced that there is a locus suppressing male organ development in standard female plants. Function of this locus is not influenced by the drugs mentioned above.
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