Complete Nucleotide Sequence of Nurrada meleagris (Helmeted Guineafowl) Mitochondrial Genome
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概要
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Guineafowl has been classified into the order Galliformes. However, little genetic information was available to establish the phylogenetic position of the Guineafowl. In the present study we subjected the mitochondrial DNA (mtDNA) of <I>Numida mereagris</I>, a representative member of Guineafowl, to complete sequencing. It was revealed that the mtDNA is a circular DNA of 16,726bp with a genomic structure the same as that of <I>Gallus gallus</I> var. <I>domesticus</I> and <I>Coturnix japonica</I> mtDNAs, though it is 62bp smaller than <I>G. g. domesticus</I> mtDNA and 29bp larger than <I>C. japonica</I> mtDNA. Similarities of the 13 genes and two ribosomal RNAs except D-loop and transfer RNAs between <I>N. meleagris</I> and <I>G. g. domesticus</I> and between <I>N. meleagris</I> and <I>C. japonica</I> ranged from 77.0% to 88.8% and from 76.2% to 88.4%, respectively. As the sequences of NADH dehydrogenase subunit 2 and cytochrome b genes have been reported for nine species (<I>Bambusicola thoracis, Coturnix chinensis, C. japonica, G. g. domesticus, Gallus varius, Pavo cristatus, Perdix perdix, Phasianus colchicus, Tympanchus phasianellus</I>) in the order Galliformes, the concatenated nucleotide sequences and amino-acid sequences of these two genes were subjected to phylogenetic analysis of <I>N. meleagris</I> against these nine species with <I>Ayathya americana</I> (Anseriformes) as an outgroup using a maximum likelihood (ML) method. The ML analyses of the first/second bases of codons, the third base of codons, and the amino-acid sequence consistently demonstrated that <I>N. meleagris</I> did not form clades with other species in the order but stayed in a remote position in the tree.
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