Evidence for Strand Asymmetry in Different Plastid Genomes
A common genome composition pattern in eubacteria is an asymmetry between the leading and lagging strands resulting in opposite skew patterns in the two replichores that lie between the origin and terminus of replication. Although this pattern has been reported for a couple of isolated plastid genom...
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| Veröffentlicht in: | Genes 2023-01, Vol.14 (2), p.320 |
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| description | A common genome composition pattern in eubacteria is an asymmetry between the leading and lagging strands resulting in opposite skew patterns in the two replichores that lie between the origin and terminus of replication. Although this pattern has been reported for a couple of isolated plastid genomes, it is not clear how widespread it is overall in this chromosome. Using a random walk approach, we examine plastid genomes outside of the land plants, which are excluded since they are known not to initiate replication at a single site, for such a pattern of asymmetry. Although it is not a common feature, we find that it is detectable in the plastid genome of species from several diverse lineages. The euglenozoa in particular show a strong skew pattern as do several rhodophytes. There is a weaker pattern in some chlorophytes but it is not apparent in other lineages. The ramifications of this for analyses of plastid evolution are discussed. |
| doi_str_mv | 10.3390/genes14020320 |
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Although this pattern has been reported for a couple of isolated plastid genomes, it is not clear how widespread it is overall in this chromosome. Using a random walk approach, we examine plastid genomes outside of the land plants, which are excluded since they are known not to initiate replication at a single site, for such a pattern of asymmetry. Although it is not a common feature, we find that it is detectable in the plastid genome of species from several diverse lineages. The euglenozoa in particular show a strong skew pattern as do several rhodophytes. There is a weaker pattern in some chlorophytes but it is not apparent in other lineages. 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| subjects | Asymmetry Chloroplasts Chromosomes Genetic aspects Genetic research Genome Genome, Plastid Genomes Hypotheses Mutation Natural history Plastids Replication origins Rhodophyta Symmetry |
| title | Evidence for Strand Asymmetry in Different Plastid Genomes |
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