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"Evolutionary origin"
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Masters of the planet : the search for our human origins
\"When homo sapiens made their entrance 100,000 years ago they were confronted by a wide range of other early humans-homo erectus, who walked better and used fire; homo habilis who used tools; and of course the Neanderthals, who were brawny and strong. But shortly after their arrival, something happened that vaulted the species forward and made them the indisputable masters of the planet. This book is devoted to revealing just what that difference is. It explores how the physical traits and cognitive ability of homo sapiens distanced them from the rest of nature. Even more importantly, Masters of the Planet looks at how our early ancestors acquired these superior abilities; it shows that their strange and unprecedented mental facility is not, as most of us were taught, simply a basic competence that was refined over unimaginable eons by natural selection. Instead, it is an emergent capacity that was acquired quite recently and changed the world definitively\"-- Provided by publisher.
Book
Jasmonate Signaling Pathway Modulates Plant Defense, Growth, and Their Trade-Offs
Lipid-derived jasmonates (JAs) play a crucial role in a variety of plant development and defense mechanisms. In recent years, significant progress has been made toward understanding the JA signaling pathway. In this review, we discuss JA biosynthesis, as well as its core signaling pathway, termination mechanisms, and the evolutionary origin of JA signaling. JA regulates not only plant regeneration, reproductive growth, and vegetative growth but also the responses of plants to stresses, including pathogen as well as virus infection, herbivore attack, and abiotic stresses. We also focus on the JA signaling pathway, considering its crosstalk with the gibberellin (GA), auxin, and phytochrome signaling pathways for mediation of the trade-offs between growth and defense. In summary, JA signals regulate multiple outputs of plant defense and growth and act to balance growth and defense in order to adapt to complex environments.
Journal Article
Host-Calibrated Time Tree Caps the Age of Giant Viruses
Abstract
Viruses are widespread parasites with important impacts on public health, economy, and ecosystems. However, little is known about their origins, ages, and early evolutionary relationships with hosts. Here, we infer the maximum divergence times for eukaryotic giant DNA viruses (phylum Nucleocytoviricota) with dating analyses calibrated by host taxon ages of virus lineages with specific host ranges. The last common ancestor of Nucleocytoviricota existed after 1,000 million years ago, suggesting a much later origin than that of the eukaryotes. The early evolution of Nucleocytoviricota either coincided with or postdated a substantial increase in the oxygen levels on the Earth's surface during the Neoproterozoic Era. The lineage diversification of giant viruses was frequently associated with host shifts, including two major transitions from amoebozoan hosts to animal hosts that eventually led to the emergence of iridoviruses and African swine fever viruses within the last 450 million years. These results outline the evolutionary timescale of a major virus group and are pivotal for further understanding the virus–host interactions and their potential ecological roles in the Earth's history.
Journal Article
Genomic adaptations to aquatic and aerial life in mayflies and the origin of insect wings
The evolution of winged insects revolutionized terrestrial ecosystems and led to the largest animal radiation on Earth. However, we still have an incomplete picture of the genomic changes that underlay this diversification. Mayflies, as one of the sister groups of all other winged insects, are key to understanding this radiation. Here, we describe the genome of the mayfly
Cloeon dipterum
and its gene expression throughout its aquatic and aerial life cycle and specific organs. We discover an expansion of odorant-binding-protein genes, some expressed specifically in breathing gills of aquatic nymphs, suggesting a novel sensory role for this organ. In contrast, flying adults use an enlarged opsin set in a sexually dimorphic manner, with some expressed only in males. Finally, we identify a set of wing-associated genes deeply conserved in the pterygote insects and find transcriptomic similarities between gills and wings, suggesting a common genetic program. Globally, this comprehensive genomic and transcriptomic study uncovers the genetic basis of key evolutionary adaptations in mayflies and winged insects.
Genomic studies of paleopteran insects, such as mayflies, are needed to reconstruct early insect evolution. Here, Almudi and colleagues present the genome of the mayfly
Cloeon dipterum
and use transcriptomics to characterize its adaptations to distinct habitats and the origin of insect wings.
Journal Article
The evolution of autotomy in leaf-footed bugs
Sacrificing body parts is one of many behaviors that animals use to escape predation. This trait, termed autotomy, is classically associated with lizards. However, several other taxa also autotomize, and this trait has independently evolved multiple times throughout Animalia. Despite having multiple origins and being an iconic antipredatory trait, much remains unknown about the evolution of autotomy. Here, we combine morphological, behavioral, and genomic data to investigate the evolution of autotomy within leaf-footed bugs and allies (Insecta: Hemiptera: Coreidae + Alydidae). We found that the ancestor of leaf-footed bugs autotomized and did so slowly; rapid autotomy (< 2 min) then arose multiple times. The ancestor likely used slow autotomy to reduce the cost of injury or to escape nonpredatory entrapment but could not use autotomy to escape predation. This result suggests that autotomy to escape predation is a co-opted benefit (i.e., exaptation), revealing one way that sacrificing a limb to escape predation may arise. In addition to identifying the origins of rapid autotomy, we also show that across species variation in the rates of autotomy can be explained by body size, distance from the equator, and enlargement of the autotomizable appendage.
Journal Article
Mitogenomic phylogeny and divergence time estimation of Artemia Leach, 1819 (Branchiopoda: Anostraca) with emphasis on parthenogenetic lineages
The brine shrimp
Artemia,
a crustacean adapted to the extreme conditions of hypersaline environments, comprises nine regionally distributed sexual species scattered (island-like) over heterogeneous environments and asexual (parthenogenetic) lineages with different ploidies. Such sexual and asexual interaction within the genus raises questions regarding the origin and time of divergence of both sexual species and asexual lineages, including the persistence of the latter over time, a problem not yet clarified using single mitochondrial and nuclear markers. Based on the complete mitochondrial genome of all species and parthenogenetic lineages, this article first describes the mitogenomic characteristics (nucleotide compositions, genome mapping, codon usage, and tRNA secondary structure) of sexual species and asexual types and, secondly, it provides a comprehensive updated phylogenetic analysis. Molecular dating and geographical evidence suggest that the ancestral
Artemia
taxon originated in
ca
. 33.97 Mya during the Paleogene Period. The mitogenomic comparisons suggest that the common ancestor of diploid and triploid parthenogenetic lineages (
ca
. 0.07 Mya) originated from a historical ancestor (
ca.
0.61 Mya) in the Late Pleistocene. Additionally, the common ancestor of tetraploid and pentaploid parthenogenetic lineages (
ca.
0.05 Mya) diverged from a historical maternal ancestor with
A. sinica
(
ca
. 0.96 Mya) in the early Pleistocene. The parthenogenetic lineages do not share a direct ancestor with any sexual species. The Asian clade ancestor diverged more recently (
ca.
14.27 Mya, Middle Miocene). The mitogenomic characteristics, maternal phylogenetic tree, and especially divergence time prove that
A. monica
and
A. franciscana
are two biological species.
Journal Article