Widespread horizontal transfer of mitochondrial genes in flowering plants

Horizontal gene transfer - the exchange of genes across mating barriers - is recognized as a major force in bacterial evolution(1,2). However, in eukaryotes it is prevalent only in certain phagotrophic protists and limited largely to the ancient acquisition of bacterial genes(3-5). Although the human genome was initially reported(6) to contain over 100 genes acquired during vertebrate evolution from bacteria, this claim was immediately and repeatedly rebutted(7,8). Moreover, horizontal transfer is unknown within the evolution of animals, plants and fungi except in the special context of mobile genetic elements(9-12). Here we show, however, that standard mitochondrial genes, encoding ribosomal and respiratory proteins, are subject to evolutionarily frequent horizontal transfer between distantly related flowering plants. These transfers have created a variety of genomic outcomes, including gene duplication, recapture of genes lost through transfer to the nucleus, and chimaeric, half-monocot, half-dicot genes. These results imply the existence of mechanisms for the delivery of DNA between unrelated plants, indicate that horizontal transfer is also a force in plant nuclear genomes, and are discussed in the contexts of plant molecular phylogeny and genetically modified plants.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/62688/1/nature01743.pd

No Laughing Matter: Fraud, the Fabliau and Chaucer’s Franklin’s Tale

In terms of its genre, the Franklin’s Tale is one of Chaucer’s most puzzling texts. It not only presents an Italian novella as a Breton lay, but splices further material from chronicles, saints’ lives and classical and patristic literature into its overall form. This paper aims to deepen the Tale’s complexity by noting the presence of a further, unremarked genre in the text, that of the fabliau. In particular, it pays close attention to the figure of the magician, arguing that this character and his tacitly rationalised sorcery are designed to evoke the rascally clercs escoliers of the French texts, whose trickery often has comparable methods and results. The wider implications of these allusions for interpreting the poem are also considered

Fundamental cosmological observations and data interpretation

ISBN 978364200791