DOI: 10.1111/gbi.12273
Scopus记录号: 2-s2.0-85041225610
论文题名: Dating phototrophic microbial lineages with reticulate gene histories
作者: Magnabosco C. ; Moore K.R. ; Wolfe J.M. ; Fournier G.P.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2018
卷: 16, 期: 2 起始页码: 179
结束页码: 189
语种: 英语
英文关键词: horizontal gene transfer
; molecular clock
; phototrophy
Scopus关键词: coevolution
; cyanobacterium
; dating method
; divergence
; geological time
; metabolism
; microbial activity
; photoautotrophy
; phylogeny
; protein
; Bacteria (microorganisms)
; Chlorobi
; Chloroflexi
; Cyanobacteria
; Photobacteria
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences
; Environmental Science: General Environmental Science
; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: Phototrophic bacteria are among the most biogeochemically significant organisms on Earth and are physiologically related through the use of reaction centers to collect photons for energy metabolism. However, the major phototrophic lineages are not closely related to one another in bacterial phylogeny, and the origins of their respective photosynthetic machinery remain obscured by time and low sequence similarity. To better understand the co-evolution of Cyanobacteria and other ancient anoxygenic phototrophic lineages with respect to geologic time, we designed and implemented a variety of molecular clocks that use horizontal gene transfer (HGT) as additional, relative constraints. These HGT constraints improve the precision of phototroph divergence date estimates and indicate that stem green non-sulfur bacteria are likely the oldest phototrophic lineage. Concurrently, crown Cyanobacteria age estimates ranged from 2.2 Ga to 2.7 Ga, with stem Cyanobacteria diverging ~2.8 Ga. These estimates provide a several hundred Ma window for oxygenic photosynthesis to evolve prior to the Great Oxidation Event (GOE) ~2.3 Ga. In all models, crown green sulfur bacteria diversify after the loss of the banded iron formations from the sedimentary record (~1.8 Ga) and may indicate the expansion of the lineage into a new ecological niche following the GOE. Our date estimates also provide a timeline to investigate the temporal feasibility of different photosystem HGT events between phototrophic lineages. Using this approach, we infer that stem Cyanobacteria are unlikely to be the recipient of an HGT of photosystem I proteins from green sulfur bacteria but could still have been either the HGT donor or the recipient of photosystem II proteins with green non-sulfur bacteria, prior to the GOE. Together, these results indicate that HGT-constrained molecular clocks are useful tools for the evaluation of various geological and evolutionary hypotheses, using the evolutionary histories of both genes and organismal lineages. © 2018 The Authors. Geobiology Published by John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85019
Appears in Collections: 影响、适应和脆弱性
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作者单位: Flatiron Institute Center for Computational Biology, Simons Foundation, New York, NY, United States; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, United States
Recommended Citation:
Magnabosco C.,Moore K.R.,Wolfe J.M.,et al. Dating phototrophic microbial lineages with reticulate gene histories[J]. Geobiology,2018-01-01,16(2)