Sequence variation in the guillemot (Alcidae: Cepphus) mitochondrial control region and its nuclear homolog.
Mol Biol Evol
; 15(1): 61-70, 1998 Jan.
Article
em En
| MEDLINE
| ID: mdl-9491605
ABSTRACT
We describe sequence variation in the mitochondrial control region and its nuclear homolog in three species and seven subspecies of guillemots (Cepphus spp.). Nuclear homologs of the 5' end of the control region were found in all individuals. Nuclear sequences were approximately 50% divergent from their mitochondrial counterparts and formed a distinct phylogenetic clade; the mitochondrial-nuclear introgression event must have predated the radiation of Cepphus. As in other vertebrates, the guillemot control region has a relatively conserved central block flanked by hypervariable 5' and 3' ends. Mean pairwise interspecific divergence values among control regions were lower than those in other birds. All individuals were heteroplasmic for the number of simple tandem nucleotide repeats (A(n)C) at the 3' end of the control region. Phylogenetic analyses suggest that black guillemots are basal to pigeon and spectacled guillemots, but evolutionary relationships among subspecies remain unresolved, possibly due to incomplete lineage sorting. Describing molecular variation in nuclear homologs of mitochondrial genes is of general interest in phylogenetics because, if undetected, the homologs may confound interpretations of mitochondrial phylogenies.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Aves
/
DNA Mitocondrial
Limite:
Animals
País/Região como assunto:
America do norte
/
Asia
Idioma:
En
Revista:
Mol Biol Evol
Assunto da revista:
BIOLOGIA MOLECULAR
Ano de publicação:
1998
Tipo de documento:
Article
País de afiliação:
Canadá