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- W2120479218 abstract "We sequenced the first ca. 900 bp of the 5'-trnL(UAA)-trnV(UAC)/ndhJ region of the chloroplast DNA of different Microseris accessions in order to resolve homoplasious length variation detected in the trnL(UAA)-trnF(GAA) region. We found two to four tandemly repeated trnF genes in the species of Microseris (Asteraceae, Lactuceae) and two in their sister genus Uropappus. Sequences indicated nonhomologous transitions between two, three, and four trnF genes in different Microseris taxa. Independent origins of similar trnF copy numbers were inferred from a chloroplast phylogeny of Microseris. The taxa involved grow on separate continents, supporting parallel origins of similar length variants. The changes in trnF copy numbers were best explained by interchromosomal recombination with unequal crossing over. The 5' copies of the repeats showed the highest sequence conservation, suggesting that these copies are likely to be functional trnF genes, whereas the other ones probably represent pseudogenes. Our results show that length polymorphisms accumulate once a duplicated sequence has become incorporated. Due to parallel gains of similar trnF copy numbers, homoplasious length variation was introduced into the data matrix. The data demonstrate that length polymorphisms cannot be used as indicators for phylogenetic distance unless they can be analyzed at the sequence level." @default.
- W2120479218 created "2016-06-24" @default.
- W2120479218 creator A5039848572 @default.
- W2120479218 creator A5091604245 @default.
- W2120479218 date "1999-10-01" @default.
- W2120479218 modified "2023-09-25" @default.
- W2120479218 title "Molecular evolution of a tandemly repeated trnF(GAA) gene in the chloroplast genomes of Microseris (Asteraceae) and the use of structural mutations in phylogenetic analyses" @default.
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- W2120479218 doi "https://doi.org/10.1093/oxfordjournals.molbev.a026043" @default.
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