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Título

Repeated Sequence Homogenization Between the Control and Pseudo-Control Regions in the Mitochondrial Genomes of the Subfamily Aquilinae

AutorCadahía, Luis CSIC; Pinsker, Wilhem; Negro, Juan J. CSIC ORCID ; Pavlicev, Mihaela; Urios, Vicente; Haring, Elisabeth
Fecha de publicaciónmay-2009
EditorWiley-Blackwell
CitaciónJOURNAL OF EXPERIMENTAL ZOOLOGY (MOL DEV EVOL) 312B:171–185 (2009)
ResumenIn birds, the noncoding control region (CR) and its flanking genes are the only parts of the mitochondrial (mt) genome that have been modified by intragenomic rearrangements. In raptors, two noncoding regions are present: the CR has shifted to a new position with respect to the ‘‘ancestral avian gene order,’’ whereas the pseudo-control region (CCR) is located at the original genomic position of the CR. As possible mechanisms for this rearrangement, duplication and transposition have been considered. During characterization of the mt gene order in Bonelli’s eagle Hieraaetus fasciatus, we detected intragenomic sequence similarity between the two regions supporting the duplication hypothesis. We performed intra- and intergenomic sequence comparisons in H. fasciatus and other falconiform species to trace the evolution of the noncoding mtDNA regions in Falconiformes. We identified sections displaying different levels of similarity between the CR and CCR. On the basis of phylogenetic analyses, we outline an evolutionary scenario of the underlying mutation events involving duplication and homogenization processes followed by sporadic deletions. Apparently, homogenization may easily occur if sufficient sequence similarity between the CR and CCR exists. Moreover, homogenization itself allows perpetuation of this continued equalization, unless this process is stopped by deletion. The Pandionidae and the Aquilinae seem to be the only two lineages of Falconiformes where homology between both regions is still detectable, whereas in other raptors no similarity was found so far. In these two lineages, the process of sequence degeneration may have slowed down by homogenization events retaining high sequence similarity at least in some sections.
Versión del editorhttp://onlinelibrary.wiley.com/doi/10.1002/jez.b.21282/pdf
URIhttp://hdl.handle.net/10261/38890
DOI10.1002/jez.b.21282
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