Paralogy and orthology in the MALVACEAE rpb2 gene family: investigation of gene duplication in hibiscus.

@article{Pfeil2004ParalogyAO,
  title={Paralogy and orthology in the MALVACEAE rpb2 gene family: investigation of gene duplication in hibiscus.},
  author={Bernard E. Pfeil and Curt L. Brubaker and Lyn A. Craven and Michael D. Crisp},
  journal={Molecular biology and evolution},
  year={2004},
  volume={21 7},
  pages={
          1428-37
        }
}
A sample of the second largest subunit of low-copy nuclear RNA polymerase II (rpb2) sequences from Malvaceae subfamily Malvoideae suggests that rpb2 has been duplicated early in the subfamily's history. Hibiscus and related taxa possess two rpb2 genes, both of which produce congruent phylogenetic patterns that are largely concordant with cpDNA topologies. No evidence of functional divergence or disruption was found among duplicated copies, suggesting that long-term maintenance of duplicated… 
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The region coding for the second largest subunit of RNA polymerase II (RPB2) was explored for resolving interspecific relationships in Arnica and lower level taxa in general and indicates that the introns of the RPB2 region could be suitable for phylogenetic studies in low level taxonomy.
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Low-copy nuclear DNA, phylogeny and the evolution of dichogamy in the betel nut palms and their relatives (Arecinae; Arecaceae).
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TLDR
Nuclear DNA sequences from introns of the low-copy nuclear gene family encoding the second largest subunit of RNA polymerases and the ribosomal internal transcribed spacer regions were used to infer origins and phylogenetic relationships of North American polyploid Silene species and their closest relatives.
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In spite of being a low copy nuclear gene region, RPB2 provided an efficient barcode to delineate Calamus species and has the potential to further extend its use as a prospective bar code to other Palm genera.
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