Scholarly Literature

This is a database of scholarly literature that concentrates currently on natural and engineered selfish genetic elements (gene drives).  The latest are shown here.
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Invasive Species Control and Resolution of Wildlife Damage Conflicts: A Framework for Chemical and Genetically Based Management Methods

15286
L. Clark, J. Eisemann, J. Godwin, K. E. Horak, K. Oh, J. O’Hare, A. Piaggio, K. Pepin and E. Ruell,  GMOs: Implications for Biodiversity Conservation and Ecological Processes,  2020-12-02 16:52:40.
Vertebrate wildlife damage management relates to developing and employing methods to mitigate against damage caused by wildlife in the areas of food production, property damage, and animal or human health and safety. Of the many management tools available

GMOs: Implications for Biodiversity Conservation and Ecological Processes

15283
Chaurasia, Anurag , Hawksworth, David L., Pessoa de Miranda, Manoela.,  GMOs: Implications for Biodiversity Conservation and Ecological Processes,  2020-12-02 16:45:05.
This book covers a broad spectrum of topics related to GMOs and allied new gene-based technologies, biodiversity, and ecosystem processes, bringing together the contributions of researchers and regulators from around the world. The aim is to offer a clear view of the benefits and effects of genetically modified crops, insects, and other animals on the soil microbiome and ecological processes. Contributors examine issues related to the development of risk assessment procedures and regulations designed to maximize benefits while minimizing risks. Beyond the scientific challenges of GMOs, the book explores the broad and contentious terrain of ethical considerations. The contributors discuss such questions as the unintended, possibly unforeseen, consequences of releasing GMOs into ecosystems, and the likelihood that the full effects of GMOs could take years, even decades, of close monitoring to become evident. The importance of developing a precautionary approach is stressed.

Modelling the Wolbachia incompatible insect technique: strategies for effective mosquito population elimination

15281
D. E. Pagendam, B. J. Trewin, N. Snoad, S. A. Ritchie, A. A. Hoffmann, K. M. Staunton, C. Paton and N. Beebe,  BMC Biology,  18:13. 2020-12-02 16:29:23.
We introduce a simple Markov population process model for studying mosquito populations subjected to a Wolbachia-IIT programme which exhibit an unstable equilibrium threshold. The model is used to study, in silico, scenarios that are likely to yield a successful elimination result. Our results suggest that elimination is best achieved by releasing males at rates that adapt to the ever-decreasing wild population, thus reducing the risk of releasing Wolbachia-infected females while reducing costs.

Mosquito genomes are frequently invaded by transposable elements through horizontal transfer

15371
E. S. de Melo and G. L. Wallau,  PLOS Genetics,  16:e1008946. 2020-11-30 21:46:36.
We characterized the whole TE content of 24 mosquito genomes and investigated the TE inheritance mode uncovering hundreds of horizontal transfer events among these species and distantly related ones. We also identify a mosquito parasitic filarial worm, th

Strategic Approach, Advances, and Challenges in the Development and Application of the SIT for Area-Wide Control of Aedes albopictus Mosquitoes in Reunion Island

15267
L. C. Gouagna, D. Damiens, C. F. Oliva, S. Boyer, G. Le Goff, C. Brengues, J.-S. Dehecq, J. Raude, F. Simard and D. Fontenille,  Insects,  11:770. 2020-11-30 19:17:02.

Reply to: “Enhancement of Aedes aegypti susceptibility to dengue by Wolbachia is not supported”

15264
C. Souto-Maior, J. G. King, L. M. Sartori, R. Maciel-de-Freitas and M. G. M. Gomes,  Nature Communications,  11:6113. 2020-11-30 19:09:46.
Ant et al.4 claim that concerns with the data and broader analysis make our conclusions misleading. We herein respond to their comments by demonstrating the robustness of our results to different treatments of the data, and expand our arguments for replacing currently adopted methods by those introduced in our paper.

Enhancement of Aedes aegypti susceptibility to dengue by Wolbachia is not supported

15258
T. H. Ant, M.-V. Mancini, J. Martinez and S. P. Sinkins,  Nature Communications,  11:6111. 2020-11-30 18:48:33.
King et al.3 used DENV infection and transmission modelling to reinterpret experimental data from two previous studies4,5. The authors claimed that wMel Wolbachia increase the mean susceptibility of Ae. aegypti to DENV, contradicting various other studies6,7,8,9,10,11,12. Here, we raise concerns with the experimental approaches used to generate one of the primary datasets on which the modelling is based, and we discuss how these limitations could make some of the original conclusions misleading.

Toxin-Antidote Elements Across the Tree of Life

A. Burga, E. Ben-David and L. Kruglyak,  Annual Review Genetics,  54:387-415. 2020-11-30 18:44:04.
Toxin-antitoxin or toxin-antidote (TA) elements are genetic dyads that cheat the laws of inheritance to guarantee their transmission to the next generation. This seemingly simple genetic arrangement-a toxin linked to its antidote-is capable of quickly spreading and persisting in natural populations. TA elements were first discovered in bacterial plasmids in the 1980s and have recently been characterized in fungi, plants, and animals, where they underlie genetic incompatibilities and sterility in crosses between wild isolates. In this review, we provide a unified view of TA elements in both prokaryotic and eukaryotic organisms and highlight their similarities and differences at the evolutionary, genetic, and molecular levels.

Combined Effects of Mating Disruption, Insecticides, and the Sterile Insect Technique on Cydia pomonella in New Zealand

15958
R. M. Horner, P. L. Lo, D. J. Rogers, J. T. S. Walker and D. M. Suckling,  Insects,  11:23. 2020-11-27 18:11:55.
We aimed to supplement these tactics with the sterile insect technique (SIT) to further suppress the codling moth on orchards. SIT involves mass rearing and sterilizing codling moth and then releasing them onto orchards where they mate with wild insects resulting in no offspring. We released sterile insects onto seven orchards using unmanned aerial vehicles and ground releases. Six years of the program saw significant drops (90-99%) in wild moth populations. The SIT is an excellent tactic for reducing moth populations in export apple orchards.

Split drive killer-rescue provides a novel threshold-dependent gene drive

15254
M. P. Edgington, T. Harvey-Samuel and L. Alphey,  Scientific Reports,  10. 2020-11-25 18:32:01.
Population genetics mathematical models are developed here to demonstrate the threshold-dependent nature of the proposed system and its robustness to imperfect homing, incomplete penetrance of toxins and transgene fitness costs, each of which are of practical significance given that real-world components inevitably have such imperfections. We show that although end-joining repair mechanisms may cause the system to break down, under certain conditions, it should persist over time scales relevant for genetic control programs. The potential of such a system to provide localised population suppression via sex ratio distortion or female-specific lethality is also explored. Additionally, we investigate the effect on introduction thresholds of adding an extra CRISPR base element, showing that this may either increase or decrease dependent on parameter context

Transformation and slippage in co-production ambitions for global technology development: The case of gene drive

16634
K. Ledingham and S. Hartley,  Environmental Science & Policy,  116:78-85. 2020-11-24 17:41:43.
Co-production is an increasingly popular framework for knowledge generation, evaluation and decision making. Despite its potential to open up decisions and practices to the input of others, co-production regularly falls short of its transformative ambitions. Through documentary analysis, we investigate the meaning and dynamics of co-production as it stretches beyond the local into global research and technology spaces. We find that in the case of global gene drive, the meaning of co-production is extended in novel ways and underpinned by new possibilities for meaningful transformation. At the same time, we also identify a simultaneous resurfacing of reductive framings of collaboration. In the paper we present ‘slippage’ as a useful heuristic in helping to understand why co-production fails. We argue that if co-production in these new spaces is to achieve its transformative ambitions, there is a need to engage with new and entrenched knowledge hierarchies that contribute to this slippage.

Field Competitiveness of Aedes albopictus (Diptera: Culicidae) Irradiated Males in Pilot Sterile Insect Technique Trials in Northern Italy

16988
R. Bellini, M. Carrieri, F. Balestrino, A. Puggioli, M. Malfacini and J. Bouyer,  Journal of Medical Entomology,  58:807-813. 2020-11-20 14:50:15.
Vector-borne diseases account for 17% of infectious diseases, leading to more than one million deaths each year. Mosquitoes are responsible for 90% of the casualties and alternative control methods to insecticides are urgently needed, especially against Aedes vectors. Aedes albopictus is a particularly important species, causing major public health problems because it is a vector of several arboviruses and has a strong invasive behavior. Various genetic control methods have been proposed to be integrated into the management strategies of Aedes species, among which the sterile insect technique (SIT), which proved efficient against various insect pests and vectors. However, the ability of released irradiated sterile male mosquitoes to compete with their wild counterparts and induce sterility in wild females, which is critical to the success of this strategy, remained poorly defined. Here, we assessed the field competitiveness of Ae. albopictus irradiated male using data from eight release trials implemented in Northern Italy for 3 yr. Sterile males were capable of inducing a good level of sterility in the wild female population, however, with high variability in time and space. The field competitiveness of the released males was strongly negatively correlated with the ratio of sterile to wild males.This should be taken into consideration when designing future programs to suppress field populations of Aedes mosquitoes.

Sequence analysis in Bos taurus reveals pervasiveness of X–Y arms races in mammalian lineages

15219
J. F. Hughes, H. Skaletsky, T. Pyntikova, N. Koutseva, T. Raudsepp, L. G. Brown, D. W. Bellott, T.-J. Cho, S. Dugan-Rocha, Z. Khan, C. Kremitzki, C. Fronick, T. A. Graves-Lindsay, L. Fulton, W. C. Warren, R. K. Wilson, E. Owens, J. E. Womack, W. J. Murphy,  Genome Research,  2020-11-18 16:58:55.
Here, we provide evidence that suppression of X–Y crossing-over unleashed a second dynamic: selfish X–Y arms races that reshaped the sex chromosomes in mammals as different as cattle, mice, and men. Using super-resolution sequencing, we explore the Y Chromosome of Bos taurus (bull) and find it to be dominated by massive, lineage-specific amplification of testis-expressed gene families, making it the most gene-dense Y Chromosome sequenced to date. As in mice, an X-linked homolog of a bull Y-amplified gene has become testis-specific and amplified. This evolutionary convergence implies that lineage-specific X–Y coevolution through gene amplification, and the selfish forces underlying this phenomenon, were dominatingly powerful among diverse mammalian lineages. Together with Y gene decay, X–Y arms races molded mammalian sex chromosomes and influenced the course of mammalian evolution.

Engineering biological diversity: the international governance of synthetic biology, gene drives, and de-extinction for conservation

15251
J. L. Reynolds,  Current Opinion in Environmental Sustainability,  49:1-6. 2020-11-17 18:23:24.
In the face of insufficient progress in conserving and restoring biodiversity, the in situ use of advanced genetic modification, gene drives, and other biotechnologies for conservation purposes are being considered, researched, and developed. This paper introduces the methods, applications, environmental risks, and social challenges of ‘conservationist synthetic biology’; reviews existing governance, with an emphasis on international instruments, institutions, and processes; and offers observations of the politics of developing further governance. The most important multilateral environmental agreement is the Convention on Biological Diversity. Governance of such conservationist synthetic biology is vital but gaps remain. The further development of governance is a political process, and conservationist synthetic biology has a political landscape that is atypical for emerging technologies.

Assessment of a Novel Adult Mass-Rearing Cage for Aedes albopictus (Skuse) and Anopheles arabiensis (Patton).

15562
H. Maïga, W. Mamai, N. S. Bimbilé Somda, T. Wallner, B. S. Poda, G. Salvador-Herranz, R. Argiles-Herrero, H. Yamada and J. Bouyer,  Insects,  11:801. 2020-11-13 15:09:03.
Successful implementation of the sterile insect technique (SIT) against Aedes albopictus and Anopheles arabiensis relies on a continuous supply of sterile males. To meet this requirement, optimization of the mass-rearing techniques is needed. This study, therefore, aims to assess a new mass-rearing cage (MRC) in terms of egg production efficiency and egg hatch rate (quality). In addition, adult survival was evaluated based on a cage adult-index for Ae. albopictus. Moreover, the cage’s suitability for use in mass An. arabiensis egg production was compared to that of the FAO/IAEA Anopheles reference cage. In Ae. albopictus rearing, the new MRC produced 1,112,110 eggs per cage following six blood meals, with minimum loss of eggs in the egging water. Furthermore, the adult index gave a good proxy of daily mortality rates in Ae. albopictus. In An. arabiensis rearing, about 130,000 eggs per egg batch were collected both from the new and the reference MRC. These findings suggest that the new MRC prototype is efficient in terms of egg production and can be used for mass-rearing in SIT programs targeting Ae. albopictus as well as An. arabiensis. The adult index was also positively validated for the detection of unusual mortality rates in Ae. albopictus mass-rearing facilities. Overall, the new MRC has shown several advantages; however, further improvements are necessary to minimize escapes during the egg collection processes

Gene drives, species, and compassion for individuals in conservation biology

15072
Y. Rohwer,  Ethics, Policy and Environment,  2020-11-10 18:20:29.
In this paper I argue that these compassionate conservationists have a moral obligation to support the investigation and development of genetic modification technologies because of their potential to minimize suffering and eliminate killing in conservation. Furthermore, I will end the paper by suggesting that these genetic technologies can help avoid actions that could be damaging to one's moral character.

When Extinction is Warranted: Invasive Species, Suppression-Drives, and the Worst-Case Scenario

15050
A. C. Thresher,  Ethics, Policy and Environment,  2020-11-09 19:31:52.
The focus of this paper is on one such risk ? the danger of a suppression-drive escaping containment and wiping out the target species globally. Here, I argue that in most cases this risk is significant enough to warrant holding off on the technology. In some cases, however, we can bypass the precautionary principle by using a dominance approach that hinges on what I term the ?Worst-Case Clause?. This clause, in turn, provides us with a litmus test that can be fruitfully used to determine what species are viable targets for suppression-drives in the wild. Using this metric in concert with other considerations, I suggest that only three species are currently possible viable targets ? the European rabbit, ship rat, and Caribbean Tree Frog.

Modeling CRISPR gene drives for suppression of invasive rodents

15003
S. E. Champer, N. Oakes, R. Sharma, P. García-Díaz, J. Champer and P. W. Messer,  bioRxiv,  2020.11.05.369942. 2020-11-05 15:27:54.
Here, we develop a high-fidelity model of an island population of invasive rodents that includes three types of suppression gene drive systems. The individual-based model is spatially explicit and allows for overlapping generations and a fluctuating population size. Our model includes variables for drive fitness, efficiency, resistance allele formation rate, as well as a variety of ecological parameters.

A gene-drive rescue system for the modification of malaria mosquito populations

14901
A. Adolfi,  Nature Research Bioengineering Community,  2020-11-03 18:48:29.
Mosquito populations can now be reliably modified using 1) antimalarial molecules that block parasite development and 2) a CRISPR-based gene drive system that mediates their rapid spreading across the vector population.

A test for meiotic drive in hybrids between Australian and Timor zebra finches

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U. Knief, W. Forstmeier, Y. Pei, J. Wolf and B. Kempenaers,  Ecology and Evolution,  2020-11-03 16:16:43.
We did not find evidence for meiotic driver loci on specific chromosomes. However, we observed a weak overall transmission bias toward Timor alleles at centromeres in females (transmission probability of Australian alleles of 47%, nominal p = 6 ? 10?5). While this is in line with the centromere drive theory, it goes against the expectation that the subspecies with the larger effective population size (i.e., the Australian zebra finch) should have evolved the more potent meiotic drivers. We thus caution against interpreting our finding as definite evidence for centromeric drive. Yet, weak centromeric meiotic drivers may be more common than generally anticipated and we encourage further studies that are designed to detect also small effect meiotic drivers.

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