๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Basal Divergences in Birds and the Phylogenetic Utility of the Nuclear RAG-1 Gene

โœ Scribed by Jeff G. Groth; George F. Barrowclough

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
119 KB
Volume
12
Category
Article
ISSN
1055-7903

No coin nor oath required. For personal study only.

โœฆ Synopsis

The single-copy RAG-1 gene is found throughout higher vertebrates and consists of a single 3.1-kb exon without intervening introns. A 2.9-kb region of the RAG-1 locus was sequenced for 14 basal taxa of birds plus the crocodylian outgroups Alligator and Gavialis. Phylogenetic analysis of the sequences supported the hypothesis that the deepest evolutionary split in extant birds separates paleognaths from neognaths. A deep division among neognaths separates the chickenand duck-like birds (''galloanserines'') from a clade consisting of all other birds (''plethornithines''). The relationships of these three basal clades in Aves were supported by high bootstrap (98 to 100%) and large decay index values (above 14). Additionally, the plethornithine clade is characterized by a 15-bp (five-codon) synapomorphic deletion relative to all other birds. RAG-1 evolves slowly, with a number of properties favoring its phylogenetic utility, including rarity of indels, minimal saturation of transition changes at 3rd positions of codons, nearly constant base composition across taxa, and no asymmetry in directional patterns of reconstructed change. However, RAG-1 does not evolve in a clocklike manner, suggesting that this gene cannot easily be used for estimating ages of ancient lineages. 1999 Academic Press

๐Ÿ“œ SIMILAR VOLUMES

Phylogenetic Utility of the Nuclear Gene
Phylogenetic Utility of the Nuclear Gene Malate Synthase in the Palm Family (Arecaceae)
โœ Carl E. Lewis; Jeff J. Doyle ๐Ÿ“‚ Article ๐Ÿ“… 2001 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 158 KB

There is currently a shortage of DNA regions known to be useful for phylogenetic research in palms (Arecaceae). We report the development and use of primers for amplifying and sequencing regions of the nuclear gene malate synthase. In palms the gene appears to be single-copy, with exon regions that

Characterization and Phylogenetic Utilit
Characterization and Phylogenetic Utility of the Mammalian Protamine P1 Gene
โœ Ronald A. Van Den Bussche; Steven R. Hoofer; Eric W. Hansen ๐Ÿ“‚ Article ๐Ÿ“… 2002 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 266 KB

We sequenced the protamine P1 gene (ca. 450 bp) from 20 bats (order Chiroptera) and the flying lemur (order Dermoptera). We compared these sequences with published sequences from 19 other mammals representing seven orders (Artiodactyla, Carnivora, Cetacea, Perissodactyla, Primates, Proboscidea, and

Phylogenetic Utility of the Nuclear Gene
Phylogenetic Utility of the Nuclear Gene Dopa Decarboxylase in Noctuoid Moths (Insecta: Lepidoptera: Noctuoidea)
โœ Q.Quentin Fang; Andrew Mitchell; Jerome C. Regier; Charles Mitter; Timothy P. Fr ๐Ÿ“‚ Article ๐Ÿ“… 2000 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 186 KB

Phylogenetic utility for the nuclear gene encoding dopa decarboxylase (DDC), little used in systematics, was recently demonstrated within the noctuid moth subfamily Heliothinae. Here we extend the test of the utility of a 709-bp DDC fragment to deeper levels, analyzing 49 species representing major

Phylogenetic Utility of the Glycerol-3-P
Phylogenetic Utility of the Glycerol-3-Phosphate Acyltransferase Gene: Evolution and Implications in Paeonia (Paeoniaceae)
โœ David C. Tank; Tao Sang ๐Ÿ“‚ Article ๐Ÿ“… 2001 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 112 KB

The nuclear-encoded chloroplast-expressed glycerol-3-phosphate acyltransferase (GPAT) gene has been found to be single-copy in a number of angiosperm families. In this study we investigated the phylogenetic utility of the GPAT gene at the interspecific level using the genus Paeonia (Paeoniaceae) as