Genomy eukaryotických organismů se nesmírně liší svou velikostí, kdy dosahují až 66tisícinásobného rozdílu. Největší v současnosti známý genom byl nalezen u vraního oka japonského (Paris japonica), nápadné byliny z Japonska. Množství jaderné DNA u tohoto druhu bylo odhadnuto na 153,32 pg, jeho genetický kód je tak 50krát delší než ten lidský., Genomes of eukaryotic organisms vary tremendously in size, spanning an approximately 66,000-fold range. Recently the largest genome has been discovered in Paris japonica, a striking plant native to Japan. The amount of nuclear DNA was estimated at 153.32 pg, making the genetic code 50 times longer than that of a human being., and Jan Suda.
Rhipicephalus camicasi Morel, Mouchet et Rodhain, 1976 is thought to be distributed across Africa, Arabian Peninsula and the Mediterranean region. It belongs to the Rhipicephalus sanguineus (Latreille, 1806) species complex. Mitochondrial genome sequences are becoming frequently used for the identification and differentiation of tick species. In the present study, the entire mitochondrial genome of R. cf. camicasi (~15 kb) collected from a camel in Saudi Arabia was sequenced and compared with mitogenomes of two species of Rhipicephalus Koch, 1844. The mitochondrial genome is 87.8% and 91.7% identical to the reference genome of R. sanguineus (sensu stricto, former "temperate lineage") and Rhipicephalus linnaei (Audouin, 1826) (former "tropical lineage"). The current study delivers a molecular reference for material that resembles R. camicasi. We propose to consider the current material, including the complete mitogenome, as the reference for R. camicasi, until a revision using topotypical material is available.
22nd Annual Mammalian Genome Conference took place in the new edifice of the Institute of Molecular Chemistry AS CR, v. v. i., in Prague. The symposium was aimed at dissiminating research news on the topic mammalian genomes, epigenomes and phenotypes. It began with Bioinformatics speakers folowed by a Student Satellite Meeting and it continued with a number of sessions. and Jiří Forejt.
The phylum Microsporidia is a large group of parasitic unicellular eukaryotes that infect a wide range of invertebrate and vertebrate taxa. These organisms are significant human and veterinary pathogens with impacts on medicine, agriculture and aquaculture. Scientists working on these pathogens represent diverse disciplines that have had limited opportunities for detailed interactions. A NATO Advanced Research Workshop 'Emergent Pathogens in the 21st Century: First United Workshop on Microsporidia from Invertebrate and Vertebrate Hosts' was held July 12-15, 2004 at the Institute of Parasitology of the Academy of Sciences of the Czech Republic to bring together experts in insect, fish, veterinary and human microsporidiosis for the exchange of information on these pathogens. At this meeting, discussions were held on issues related to taxonomy and phylogeny. It was recognized that microsporidia are related to fungi, but the strong opinion of the participants was that the International Code of Zoological Nomenclature should continue to be applied for taxonomic descriptions of the Microsporidia and that they be treated as an independent group emerging from a paraphyletic fungi. There continues to be exponential growth in the pace and volume of research on these ubiquitous intracellular protists. The small genomes of these organisms and the reduction in the size of many of their genes are of interest to many disciplines. Many microsporidia are dimorphic and the mechanisms underlying these morphologic changes remain to be elucidated. Epidemiologic studies to clarify the source of human microsporidiosis and ecologic studies to understand the multifaceted relationship of the Microsporidia and their hosts are important avenues of investigation. Studies on the Microsporidia should prove useful to many fields of biologic investigation.