Affiliation:
1. Virginia Bioinformatics Institute, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
Abstract
ABSTRACT
The branching order and coherence of the alphaproteobacterial orders have not been well established, and not all studies have agreed that mitochondria arose from within the
Rickettsiales
. A species tree for 72 alphaproteobacteria was produced from a concatenation of alignments for 104 well-behaved protein families. Coherence was upheld for four of the five orders with current standing that were represented here by more than one species. However, the family
Hyphomonadaceae
was split from the other
Rhodobacterales
, forming an expanded group with
Caulobacterales
that also included
Parvularcula
. The three earliest-branching alphaproteobacterial orders were the
Rickettsiales
, followed by the
Rhodospirillales
and then the
Sphingomonadales
. The principal uncertainty is whether the expanded
Caulobacterales
group is more closely associated with the
Rhodobacterales
or the
Rhizobiales
. The mitochondrial branch was placed within the
Rickettsiales
as a sister to the combined
Anaplasmataceae
and
Rickettsiaceae
, all subtended by the
Pelagibacter
branch.
Pelagibacter
genes will serve as useful additions to the bacterial outgroup in future evolutionary studies of mitochondrial genes, including those that have transferred to the eukaryotic nucleus.
Publisher
American Society for Microbiology
Subject
Molecular Biology,Microbiology
Cited by
230 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献