Organization of mitochondrial DNA in the basidiomycetous<i>Dioszegia hungarica</i>(<i>Cryptococcus hungaricus)</i>species

Gácser, Attila; Hamari, Zsuzsanna; Pfeiffer, Ilona; Litter, Judit; Kevei, Ferenc; Kucsera, Judit

doi:10.1111/j.1574-6968.2002.tb11236.x

Cited by 6 publications

(1 citation statement)

References 20 publications

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“…For instance, transcription of rhlI and rhlR are induced by the las system. 13 A third LuxR homolog, QscR (named for quorum-sensing-control repressor), has been identified in P. aeruginosa ; however, its function is poorly understood at present. No “QscI” has been identified, nor is such a LuxI homolog predicted based upon an analysis of the sequenced P. aeruginosa genome.…”

Section: Factors Influencing P Aeruginosa Biofilm Formationmentioning

confidence: 99%

The contribution of cell-cell signaling and motility to bacterial biofilm formation

et al. 2011

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Many bacteria grow attached to a surface as biofilms. Several factors dictate biofilm formation, including responses by the colonizing bacteria to their environment. Here we review how bacteria use cell-cell signaling (also called quorum sensing) and motility during biofilm formation. Specifically, we describe quorum sensing and surface motility exhibited by the bacterium Pseudomonas aeruginosa, a ubiquitous environmental organism that acts as an opportunistic human pathogen in immunocompromised individuals. P. aeruginosa uses acyl-homoserine lactone signals during quorum sensing to synchronize gene expression important to the production of polysaccharides, rhamnolipid, and other virulence factors. Surface motility affects the assembly and architecture of biofilms, and some aspects of motility are also influenced by quorum sensing. While some genes and their function are specific to P. aeruginosa, many aspects of biofilm development can be used as a model system to understand how bacteria differentially colonize surfaces.

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Section: Factors Influencing P Aeruginosa Biofilm Formationmentioning

confidence: 99%

The contribution of cell-cell signaling and motility to bacterial biofilm formation

et al. 2011

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The evolutionary processes of mitochondrial and chloroplast genomes differ from those of nuclear genomes

Korpelainen

2004

Naturwissenschaften

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This paper first introduces our present knowledge of the origin of mitochondria and chloroplasts, and the organization and inheritance patterns of their genomes, and then carries on to review the evolutionary processes influencing mitochondrial and chloroplast genomes. The differences in evolutionary phenomena between the nuclear and cytoplasmic genomes are highlighted. It is emphasized that varying inheritance patterns and copy numbers among different types of genomes, and the potential advantage achieved through the transfer of many cytoplasmic genes to the nucleus, have important implications for the evolution of nuclear, mitochondrial and chloroplast genomes. Cytoplasmic genes transferred to the nucleus have joined the more strictly controlled genetic system of the nuclear genome, including also sexual recombination, while genes retained within the cytoplasmic organelles can be involved in selection and drift processes both within and among individuals. Within-individual processes can be either intra- or intercellular. In the case of heteroplasmy, which is attributed to mutations or biparental inheritance, within-individual selection on cytoplasmic DNA may provide a mechanism by which the organism can adapt rapidly. The inheritance of cytoplasmic genomes is not universally maternal. The presence of a range of inheritance patterns indicates that different strategies have been adopted by different organisms. On the other hand, the variability occasionally observed in the inheritance mechanisms of cytoplasmic genomes reduces heritability and increases environmental components in phenotypic features and, consequently, decreases the potential for adaptive evolution.

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Differences in Mitochondrial Genome Organization of Cryptococcus Neoformans Strains

Litter

Keszthelyi

Hamari

et al. 2005

Antonie Van Leeuwenhoek

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The organization of the mitochondrial genomes in two strains belonging in different varieties of Cryptococcus neoformans was analysed. Physical maps of the mtDNA of the IFM5844 (var. neoformans) and IFO410 (var. grubii) strains were constructed by using EcoRI and EcoRV restriction enzymes; functional maps were constructed by hybridization, cloning and sequencing. Most of the genes important in the mitochondrial function (ND1, ND2, ND3, ND4, ND4L, ND5, ND6, ATP6, ATP9, COX1, COX2 and COB) and protein synthesis (SsrRNA and LsrRNA) were localized. We did not find any differences between the strains in the order of these genes. However, they differed significantly in the sizes of the mtDNAs: 32.6 kb for IFM5844, and 24.1 kb for IFO410. This can be attributed to two large regions of the mtDNA. In these regions, differences were found in the numbers of introns in COX1 (no intron in var. grubii, 5 introns in var. neoformans), COB (1 intron in var. grubii, 2 introns in var. neoformans), LsrRNA (no intron in var. grubii, 2 introns in var. neoformans), and ND5 (no intron in var. grubii, 1 intron in var. neoformans) genes. In several introns of the COB and COX1 genes LAGLIDADG motifs were found. Differences were also observed in the nucleotide sequences of some genes and in the sizes and sequences of intergenic regions. The nucleotide sequences of the genes of the IFM and IFO strains were compared with those of the H-99 and JEC 21 strains from the database. Surprisingly high similarities were found between the strains belonging in var. grubii (IFO 410 and H-99) and var. neoformans (IFM 5844 and JEC 21).

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Organization of mitochondrial DNA in the basidiomycetousDioszegia hungarica(Cryptococcus hungaricus)species

Cited by 6 publications

References 20 publications

The contribution of cell-cell signaling and motility to bacterial biofilm formation

The contribution of cell-cell signaling and motility to bacterial biofilm formation

The evolutionary processes of mitochondrial and chloroplast genomes differ from those of nuclear genomes

Differences in Mitochondrial Genome Organization of Cryptococcus Neoformans Strains

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