NDLI: An Expansion of Age Constraints for Microbial Clades that Lack a Conventional Fossil Record Using Phylogenomic Dating

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Journal of Molecular Evolution : Volume 73, Issue 1-2, August 2011

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An Expansion of Age Constraints for Microbial Clades that Lack a Conventional Fossil Record Using Phylogenomic Dating

Content Provider	Springer Nature Link
Author	Blank, Carrine E.
Copyright Year	2011
Abstract	Most microbial taxa lack a conventional microfossil or biomarker record, and so we currently have little information regarding how old most microbial clades and their associated traits are. Building on the previously published oxygen age constraint, two new age constraints are proposed based on the ability of microbial clades to metabolize chitin and aromatic compounds derived from lignin. Using the archaeal domain of life as a test case, phylogenetic analyses, along with published metabolic and genetic data, showed that members of the Halobacteriales and Thermococcales are able to metabolize chitin. Ancestral state reconstruction combined with phylogenetic analysis of the genes underlying chitin degradation predicted that the ancestors of these two groups were also likely able to metabolize chitin or chitin-related compounds. These two clades were therefore assigned a maximum age of 1.0 Ga (when chitin likely first appeared). Similar analyses also predicted that the ancestor to the Sulfolobus solfataricus–Sulfolobus islandicus clade was able to metabolize phenol using catechol dioxygenase, so this clade was assigned a maximum age of 475 Ma. Inferred ages of archaeal clades using relaxed molecular clocks with the new age constraints were consistent with those inferred with the oxygen age constraints. This work expands our current toolkit to include Paleoproterozoic, Neoproterozoic, and Paleozoic age constraints, and should aid in our ability to phylogenetically reconstruct the antiquity of a wide array of microbial clades and their associated morphological and biogeochemical traits, spanning deep geologic time. Such hypotheses—although built upon evolutionary inferences—are fundamentally testable.
Starting Page	188
Ending Page	208
Page Count	21
File Format	PDF
ISSN	00222844
Journal	Journal of Molecular Evolution
Volume Number	73
Issue Number	3-4
e-ISSN	14321432
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-11-22
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Archaea Microbial evolution Phylogenomic dating Relaxed molecular clock Chitinase Chitin degradation Lignin degradation Plant Sciences Microbiology Cell Biology Animal Genetics and Genomics Plant Genetics & Genomics Evolutionary Biology
Content Type	Text
Resource Type	Article
Subject	Genetics Molecular Biology Ecology, Evolution, Behavior and Systematics

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