The Karyotype of the Hoatzin (Opisthocomus hoazin) - A Phylogenetic Enigma of the Neornithes
| Autor: | Michelly S. dos Santos, Malcolm A. Ferguson-Smith, Marcella Mergulhão Tagliarini, Edivaldo Herculano Corrêa de Oliveira, Rafael Kretschmer, Ivanete de Oliveira Furo, Patricia C. M. O’Brien |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Charadriiformes Galliformes biology Phylogenetic tree Gruiformes Karyotype biology.organism_classification 010603 evolutionary biology 01 natural sciences Hoatzin Foregut fermentation 03 medical and health sciences 030104 developmental biology Evolutionary biology Genetics Molecular Biology Genetics (clinical) Cytotaxonomy |
| Zdroj: | Cytogenetic and Genome Research. 156:158-164 |
| ISSN: | 1424-859X 1424-8581 |
| DOI: | 10.1159/000494707 |
| Popis: | The hoatzin (Opisthocomus hoazin Müller, 1776) is a folivorous bird, endemic to the Amazonian region. It presents some unique characteristics, including wing claws and foregut fermentation, which make its phylogenetic relationship to other birds difficult to determine. There have been various attempts to place it among the Galliformes, Gruiformes, Musophagiformes, Cuculiformes, and Charadriiformes, but phylogenetic analyses always show low supporting values. Nowadays, the hoatzin is included in the monotypic order Opisthocomiformes, but the relationship of this order to other groups of birds is still unclear. Although its karyotype resembles the typical avian model, fissions of the syntenic groups corresponding to chicken chromosomes 1 and 2 and 2 fusions were found. The presence of 18S rDNA clusters in 2 pairs of microchromosomes is another derived character. Hence, different rearrangements were detected in the karyotype of the hoatzin, indicating it has been derived from the putative ancestral karyotype by the occurrence of fissions and fusions. However, as these rearrangements are not exclusive to O. hoazin, they do not clarify the phylogenetic position of this enigmatic species. |
| Databáze: | OpenAIRE |
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