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A new synergistic approach of classical conservation strategies combined with advanced assisted reproduction technologies (aART) allows for protection and rescue of endangered keystone species at the brink of extinction, which can help to safeguard complex ecosystems. Reproduction biology and management in mammal species is not only challenging in regards to their diverging sizes, anatomy, and often unknown physiology; it also requires customized training or chemical restraint protocols for safe handling. Besides these general challenges, there are several new assisted reproduction techniques (ART) specifically tailored to critically endangered mammals. The current portfolio of ART in these mammalian taxa is ranging from sexual cycle characterization and manipulation, semen collection and cryopreservation, artificial insemination, biobanking of living cells, oocyte collection, in vitro fertilization (IVF), and embryo production, embryo transfer as well as stem cell‐derived in vitro gametogenesis for generating gametes in culture. The article covers advanced assisted reproduction technologies (aART), success and challenges, as well as ethical implications. [ABSTRACT FROM AUTHOR]

Transhumanism is a movement that advocates for the enhancement of human capabilities through the use of advanced technologies such as genetic enhancement. This article explores the definition, history, and development of transhumanism. Then, it compares the stance on genetic enhancement from the perspectives of bio-conservatism, bio-liberalism, and transhumanism. This article posits that transhuman evolution has twofold implications, allowing for the integration of transhumanist research and evolutionary biology. First, it offers a compelling scientific framework for understanding genetic enhancement, avoiding technological progressivism, and incorporating concepts of evolutionary biology. Second, it represents a new evolutionary paradigm distinct from traditional Lamarckism and Darwinism. It marks the third synthesis of evolutionary biology, offering fresh perspectives on established concepts such as artificial selection and gene-culture co-evolution. In recent decades, human enhancement has captivated not only evolutionary biologists, neurobiologists, psychologists, and philosophers, but also those in fields such as cybernetics and artificial intelligence. In addition to genetic enhancement, other human enhancement technologies, including brain-computer interfaces and brain uploading, are currently under development, which the paradigm of transhuman evolution can better integrate into its framework. [ABSTRACT FROM AUTHOR]

The cumulative impact of enhancement technologies may alter the human species in the very long‐term future. In this article, I will start showing how radical genetic enhancements may accelerate the conversion into a novel species. I will also clarify the concepts of 'biological species', 'transhuman' and 'posthuman'. Then, I will summarize some ethical arguments for creating a transhuman or posthuman species with a substantially higher level of well‐being than the human one. In particular, I will present what I shall call the Principle of the Best Interests of Posthumanity, which states that the enhancement of the human and transhuman species must be directed towards the creation of a posthuman existence that is substantially more valuable than its predecessors. I suggest that human extinction may be considered, within that principle, as one of the best interests of posthumanity. Finally, I will develop three objections that make that principle unattractive and that show that pursuing a full‐blown programme of posthuman evolution is ethically flawed. [ABSTRACT FROM AUTHOR]

The wine industry is one of the most important industries globally, particularly for Portugal, making a significant contribution to the Portuguese Bioeconomy. The Douro Demarcated Region (DDR) stands out as one of the largest wine-producing areas in the country. Its centuries-old culture has fostered a rich diversity, developed through vegetative and genetic breeding. Within the wine market, the highest prices for grapes are attained only under optimal edaphoclimatic conditions and when phenotypic characteristics, such as berry size and color, flowering and seed number, align favorably. Viticulture is influenced by environmental factors, diseases, and pests, impacting its economic value, profitability, and, ultimately, the employment and economic conditions of those dependent on the crops. Genetic improvement of phenotypic traits offers a faster and more cost-effective means of achieving desirable characteristics, translating into enhanced productivity and wine quality. This work focuses on presenting information about Douro grapes (region, varieties, diseases/pest, and economic value) and explores grapevine genetic diversity, along with approaches to identify genes associated with various desired traits. [ABSTRACT FROM AUTHOR]

When obtaining new cultivars or monitoring the nutritional composition of lettuce, new techniques are necessary given the high cost and time required to conduct laboratory analyses of plant composition by conventional methods. The objective of this study was to evaluate different vegetation indices for the estimation of anthocyanin, chlorophyll, and carotenoids in mini-lettuce genotypes with different leaf colors and different typologies from red, green, and blue (RGB) images. The contents of pigments were evaluated in 15 lettuce genotypes, in addition to the soil plant analysis development (SPAD) index and vegetation indices in the visible range. The variability among genotypes was confirmed by the Scott-Knott test (p < 0.05) and multivariate analysis. Linear regressions were obtained between the green leaf index (GLI) and leaf pigments. GLI was a good predictor for estimating the contents of anthocyanin (r = −0.83; r2 = 0.75), carotenoid (r = −0.59; r2 = 0.43), chlorophyll a (r = −0.69; r2 = 0.48), chlorophyll b (r = −0.62; r2 = 0.39), and total chlorophyll (r = −0.77; r2 = 0.65) in red and green mini-lettuce. The high-performance phenotyping technique can be used to evaluate leaf pigments in breeding programs, as well as in crops for monitoring biofortification levels in lettuce. [ABSTRACT FROM AUTHOR]

Forestry companies have invested in genetic improvement to increase wood production in a shorter amount of time. Thus, studies are needed to compare the properties of clonal and seminal wood materials. The objective of this study was to analyze physical and mechanical properties of Tectona grandis from clonal (C1 and C2) and seminal (S) origin and evaluate the yield and quality of sawn wood subjected to outdoor and oven drying. Genetic material was collected from six, 15-year-old trees. Clone C2 presented the lowest amount of bark, and 51 % heartwood up to half the commercial height, while the heartwood of C1 and S went up to 25 % of the height. The three materials did not differ statistically for maximum angular deviation, pith eccentricity, basic density, Janka hardness, anisotropy, commercial income of sawn wood and the presence of knots. After the drying processes, the bowing and crooking indexes were less than 5 mm.m-1, however, the seminal material showed a higher cracking incidence after outdoor and oven drying. In conclusion, the wood properties of the three materials are similar. In addition, the oven drying process is recommended.

The wine industry is one of the most important industries globally, particularly for Portugal, making a significant contribution to the Portuguese Bioeconomy. The Douro Demarcated Region (DDR) stands out as one of the largest wine-producing areas in the country. Its centuries-old culture has fostered a rich diversity, developed through vegetative and genetic breeding. Within the wine market, the highest prices for grapes are attained only under optimal edaphoclimatic conditions and when phenotypic characteristics, such as berry size and color, flowering and seed number, align favorably. Viticulture is influenced by environmental factors, diseases, and pests, impacting its economic value, profitability, and, ultimately, the employment and economic conditions of those dependent on the crops. Genetic improvement of phenotypic traits offers a faster and more cost-effective means of achieving desirable characteristics, translating into enhanced productivity and wine quality. This work focuses on presenting information about Douro grapes (region, varieties, diseases/pest, and economic value) and explores grapevine genetic diversity, along with approaches to identify genes associated with various desired traits.

Base editors are a new family of programmable genome editing tools that fuse ssDNA (single stranded DNA) modifying enzymes to catalytically inactive CRISPR-associated (Cas) endonucleases to induce highly efficient single base changes. With dozens of base editors now reported, it is apparent that these tools are highly modular; many combinations of ssDNA modifying enzymes and Cas proteins have resulted in a variety of base editors, each with its own unique properties and potential uses. In this perspective, we describe currently available base editors, highlighting their modular nature and describing the various options available for each component. Furthermore, we briefly discuss applications in synthetic biology and genome engineering where base editors have presented unique advantages over alternative techniques.

Base editors are a new family of programmable genome editing tools that fuse ssDNA (single stranded DNA) modifying enzymes to catalytically inactive CRISPR-associated (Cas) endonucleases to induce highly efficient single base changes. With dozens of base editors now reported, it is apparent that these tools are highly modular; many combinations of ssDNA modifying enzymes and Cas proteins have resulted in a variety of base editors, each with its own unique properties and potential uses. In this perspective, we describe currently available base editors, highlighting their modular nature and describing the various options available for each component. Furthermore, we briefly discuss applications in synthetic biology and genome engineering where base editors have presented unique advantages over alternative techniques.

Emerging reprogenetic technologies may radically change how humans reproduce in the not‐so‐distant future. One foreseeable consequence of disruptive innovations in the procreative domain is an increase in the reproductive autonomy of intended parents. Regarding the prospective parental liberty of enhancing non‐health–related traits of the offspring, one controversy has particularly dominated the literature. Does parents' choice of genetically enhancing the traits of their descendants compromise children's future personal autonomy? In this article, I will analyse the main arguments which posit that reprogenetic enhancement could be at odds with the child's future autonomy. I will argue that these objections are ill‐founded. Moreover, I will present other arguments that show that reprogenetic technologies can enhance the autonomy of future children. Autonomy enhancement is a plausible and pro tanto desirable application of emerging reprogenetic technologies. [ABSTRACT FROM AUTHOR]

Resumen: Los avances científicos hacen prever que, en un futuro próximo, la posibilidad de modificar los genes de un nuevo individuo, ya sea actuando a nivel de las células germinales o en embriones preimplantacionales, esté al alcance de toda la población. A fines del año 2018, la comunidad científica internacional expresó su preocupación por los experimentos realizados por el Dr. He Jiankui quien, por medio de la técnica CRISPR-Cas 9, modificó genéticamente a embriones humanos con fines reproductivos, logrando el nacimiento de al menos dos niñas.En el presente artículo, haremos un análisis ético del experimento del Dr. Jiankui siguiendo los criterios planteados por Emanuel; de acuerdo con esta mirada, este experimento no cumplió con ninguno de los estándares éticos utilizados habitualmente por los comités ético-científicos cuando realizan su evaluación de un protocolo. Luego revisaremos las controversias éticas relacionadas con el uso de la edición genética en células germinales (espermatozoides y óvulos) y embriones preimplantacionales humanos con fines reproductivos. Dado que estos cambios son heredables para las futuras generaciones, y que la técnica está aún en etapa experimental, argumentaremos a favor de que exista una moratoria respecto de su uso con estos fines. Cuando la edición genética se usa sin fines reproductivos, sino que, con el propósito de generar nuevo conocimiento, fundamentaremos por qué consideramos necesario distinguir la aplicación de la técnica en células germinales respecto de investigar en embriones humanos, distinción que podrá ser cuestionada dependiendo de la valoración que se tenga del embrión humano como un organismo vivo de la especie humana. Asimismo, discutiremos brevemente las diferencias que existen entre el uso de técnicas de edición genética para curar o prevenir enfermedades, de aquella utilizada para producir mejoras o “enhancement” de la raza humana, puesto que esta última tiene varios reparos morales.Finalizaremos con un breve análisis de la perspectiva regulatoria en Chile y a nivel internacional, puesto que algunas de las aplicaciones de estas técnicas plantean cuestiones éticas que han puesto de relieve la necesidad de una sólida supervisión en esta área Summary: Scientific advances suggest that, in the near future, the possibility of editing the genes of a new individual, either by acting on germ cells or in pre-implantation embryos, will be within the reach of the entire population, a possibility that raises important ethical concerns. At the end of 2018, the international scientific community expressed its concern about the experiments carried out by Dr. He Jiankui who, through the CRISPR-Cas 9 technique, genetically modified human embryos for reproductive purposes, achieving the birth of at least two girls.In this article, we will make an ethical analysis of Dr. Jiankui's experiment following Emanuel's criteria; according to this view, this experiment did not comply with any of the ethical standards commonly used by research ethics committees when evaluating a protocol. We will then review the ethical controversies related to the use of human gene editing in germ cells (sperms and eggs) and preimplantation embryos for reproductive purposes. Considering that these changes are heritable for future generations, and that the technique is still in an experimental stage, we will argue in favor of a moratorium on its use for these purposes. When gene editing is used without reproductive purposes but solely for research, we will justify why we consider necessary to distinguish the application of this technique in germ cells from research in human embryos, a distinction that may be questioned depending on whether the human embryo is considered as a living organism of the human species. Likewise, we will briefly discuss the differences that exist between the use of genetic editing techniques to cure or prevent diseases, from that used to produce improvements or “enhancement” of the human race, since the latter has several moral objections.We will end with a brief analysis of regulatory aspects in Chile and internationally, since some of the applications of these techniques raise ethical issues that have highlighted the need for strong supervision in this area.

Luffa hermaphrodita Singh & Bhandari, known as Satputia, a semi-wild taxon originating from L. graveolens is an underutilized vegetable. It has a unique clustered fruiting habit, smooth fruits and bisexual flowers. Desirable traits such as plant architecture, earliness, crossability with ridge gourd and fertile hybrids has prospects for utilization in ridge-gourd improvement. Despite these advantages, no systematic study has been done for genetic characterization of Luffa hermaphrodita. Therefore, morphological and molecular characterization of a set of 36 genotypes of Satputia collected from three phytogeographical regions of India was performed. Morphological characterization revealed a high genotypic variation indicating wide diversity within the genotypes. Five clusters were observed through D2 analysis, with cluster I and II showing maximum inter-cluster distance. First six principal components explained 80.3% of total variation. Economically important traits, viz, node number of first hermaphrodite flower, fruits per cluster, clusters per plant and vine length contributed maximum towards divergence in Satputia genotypes. Based on yield and its attributing traits, Satputia genotypes DSat-8, DSat-63, DSat-112–1, DSat-116 and DSat-125 were identified as promising and will be utilized for ridge gourd improvement. Molecular characterization with EST-SSR primers and ISSR markers could delineate the genotypes into two distinct clusters belonging to L. acutangula and L. hermaphrodita with moderate diversity. Five ISSR primers with high resolving power and one EST-SSR primer pair are valuable for diversity analysis and DNA fingerprinting in Luffa spp. This investigation has revealed untapped variability in Satputia and identified promising genotypes that would play a significant role in ridge gourd improvement. [ABSTRACT FROM AUTHOR]

Copyright of Revista Caatinga is the property of Revista Caatinga and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This focus issue considers the normative implications of the recent emergence in genome editing technology known as CRISPR (clustered regularly interspaced short palindromic repeats) or CRISPR‐associated protein 9. Originally discovered in the adaptive immune systems of bacteria and archaea, CRISPR enables researchers to make efficient and site‐specific modifications to the genomes of cells and organisms. More accessible, precise, and economic than previous gene editing technologies, CRISPR holds the promise of not only transforming the fields of genetics, agriculture, and human medicine, but also heralding a new era of democratized biotechnology. However, the speed with which developments in the field have progressed threatens to overwhelm our normative sensibilities about the long‐term practical and ethical implications. The contributors to this focus issue attempt to think through some of the more salient moral and practical consequences of CRISPR in the context of religious ethics, particularly as they relate to themes of autonomy, human flourishing, social justice, and the ethics of enhancement. [ABSTRACT FROM AUTHOR]

The 21st century has been revolutionary for the field of clinical genomics, with major advancements and breakthroughs over the years. It is now considered an instrumental tool in clinical and preventive medicine and has been used on a day-to-day basis to complement current clinical practice. However, with advancements in genomics comes greater bioethical concerns, which becomes increasingly complex with more cutting-edge technology. Some of the major ethical concerns include obtaining informed consent, possibility for genetic enhancements and eugenics, genomic equity and potential discrimination and cloning. It is imperative that we appreciate the benefits of genomic medicine in complementing traditional practices, identify and address the ethical concerns with relation to the practice of genomic medicine, and to ensure a common goal of improving human lives. With these in mind, the practice of genomics can have maximum impact in the collective health of the population, with greater benefit to all. [ABSTRACT FROM AUTHOR]

Competing Interests: Competing interests: None declared.

Competing Interests: Competing interests: None declared.

In 'Parental Genetic Shaping and Parental Environmental Shaping', Anca Gheaus argues there is a normative difference between parents using genetic means to influence the development of their child, and parents using environmental means to achieve the same ends. Genetic shaping but not environmental shaping, it is claimed, introduces a negative asymmetry in the child-caregiver relationship. In this paper, we argue that Gheaus' argument fails as a critique of genetic shaping, and does not establish a moral difference between genetic and environmental shaping. Contrary to Gheaus' arguments in both 'Parental Genetic Shaping and Parental Environmental Shaping' and 'Parental Enhancement and Symmetry of Power in the Parent-Child Relationship', we also argue that even if genetic or prebirth shaping introduces further inequality in the parent-child relationship, this is not necessarily a bad thing, and it is not clear how a parent refraining from taking up the availability of such technology leaves the child better off., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. No commercial re-use. See rights and permissions. Published by BMJ.)

Competing Interests: Competing interests: None declared.

Background: The evaluation of the magnitude of genetic diversity present in the germplasm collection is prerequisite for bottle gourd improvement programme. The characterization of the diversity pattern of Indian bottle gourd accessions will facilitate the optimal use of genetic resources for breeding improved cultivars. Methods: In the present study, the magnitude of genetic diversity was evaluated in ninety-one genotypes of bottle gourd collected across fourteen different agro-climatic zones of India. Results: Significant variations were observed for all the studied ten quantitative and nine qualitative traits. The ninety-one genotypes were grouped into nine clusters based on cluster analysis of morphological characteristics. Eigen value from principal component analysis depicted first seven quantitative traits accounted for more than 97.5 cumulative percent of the total variations. The first two components accounted for 50 cumulative percent of the total variation, which signifies a high degree of correlation between the analyzed traits. Molecular diversity with the 40 SSR markers screened revealed 11 polymorphic markers in the genotypes studied. Population structure analysis divulged five populations, conforming to the Principal Coordinate Analysis. Molecular analysis revealed genetically diverse genotypes along with the morphologically divergent genotypes from the quantitative traits and highest inter-cluster distance would be the most appropriate parents for exploiting heterosis. Conclusions: The results of this study will facilitate the optimal use of genetic resources for breeding improved cultivars of bottle gourd and the adoption of the identified superior genotypes directly by the breeders. [ABSTRACT FROM AUTHOR]

Monoterpenes (C10 isoprenoids) are the main components of essential oils and are possible precursors for many commodity chemicals and high energy density fuels. Monoterpenes are synthesized from geranyl diphosphate (GPP), which is also the precursor for the biosynthesis of farnesyl diphosphate (FPP). FPP biosynthesis diverts the carbon flux from monoterpene production to C15 products and quinone biosynthesis. In this study, we tested a chromosomal mutation of Escherichia coli's native FPP synthase (IspA) to improve GPP availability for the production of monoterpenes using a heterologous mevalonate pathway. Monoterpene production at high levels required not only optimization of GPP production but also a basal level of FPP to maintain growth. The optimized strains produced two jet fuel precursor monoterpenoids 1,8-cineole and linalool at the titer of 653 mg/L and 505 mg/L, respectively, in batch cultures with 1% glucose. The engineered strains developed in this work provide useful resources for the production of high-value monoterpenes. Biotechnol. Bioeng. 2017;114: 1703-1712. © 2017 Wiley Periodicals, Inc.

When obtaining new cultivars or monitoring the nutritional composition of lettuce, new techniques are necessary given the high cost and time required to conduct laboratory analyses of plant composition by conventional methods. The objective of this study was to evaluate different vegetation indices for the estimation of anthocyanin, chlorophyll, and carotenoids in mini-lettuce genotypes with different leaf colors and different typologies from red, green, and blue (RGB) images. The contents of pigments were evaluated in 15 lettuce genotypes, in addition to the soil plant analysis development (SPAD) index and vegetation indices in the visible range. The variability among genotypes was confirmed by the Scott-Knott test (p < 0.05) and multivariate analysis. Linear regressions were obtained between the green leaf index (GLI) and leaf pigments. GLI was a good predictor for estimating the contents of anthocyanin (r = −0.83; r2 = 0.75), carotenoid (r = −0.59; r2 = 0.43), chlorophyll a (r = −0.69; r2 = 0.48), chlorophyll b (r = −0.62; r2 = 0.39), and total chlorophyll (r = −0.77; r2 = 0.65) in red and green mini-lettuce. The high-performance phenotyping technique can be used to evaluate leaf pigments in breeding programs, as well as in crops for monitoring biofortification levels in lettuce.

Copyright of Revista Médica Clínica Las Condes is the property of Editorial Sanchez y Barcelo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The fermentation of simple sugars to ethanol has been the most successful biofuel process to displace fossil fuel consumption worldwide thus far. However, the physical properties of ethanol and automotive components limit its application in most cases to 10-15 vol% blends with conventional gasoline. Fermentative co-production of ethanol and acetone coupled with a catalytic alkylation reaction could enable the production of gasoline blendstocks enriched in higher-chain oxygenates. Here we demonstrate a synthetic pathway for the production of acetone through the mevalonate precursor hydroxymethylglutaryl-CoA. Expression of this pathway in various strains of Escherichia coli resulted in the co-production of acetone and ethanol. Metabolic engineering and control of the environmental conditions for microbial growth resulted in controllable acetone and ethanol production with ethanol:acetone molar ratios ranging from 0.7:1 to 10.0:1. Specifically, use of gluconic acid as a substrate increased production of acetone and balanced the redox state of the system, predictively reducing the molar ethanol:acetone ratio. Increases in ethanol production and the molar ethanol:acetone ratio were achieved by co-expression of the aldehyde/alcohol dehydrogenase (AdhE) from E. coli MG1655 and by co-expression of pyruvate decarboxylase (Pdc) and alcohol dehydrogenase (AdhB) from Z. mobilis. Controlling the fermentation aeration rate and pH in a bioreactor raised the acetone titer to 5.1 g L(-1) , similar to that obtained with wild-type Clostridium acetobutylicum. Optimizing the metabolic pathway, the selection of host strain, and the physiological conditions employed for host growth together improved acetone titers over 35-fold (0.14-5.1 g/L). Finally, chemical catalysis was used to upgrade the co-produced ethanol and acetone at both low and high molar ratios to higher-chain oxygenates for gasoline and jet fuel applications. Biotechnol. Bioeng. 2016;113: 2079-2087. © 2016 Wiley Periodicals, Inc.

One of the key drivers for successful metabolic engineering in microbes is the efficacy by which genomes can be edited. As such there are many methods to choose from when aiming to modify genomes, especially those of model organisms like yeast and bacteria. In recent years, clustered regularly interspaced palindromic repeats (CRISPR) and its associated proteins (Cas) have become the method of choice for precision genome engineering in many organisms due to their orthogonality, versatility and efficacy. Here we review the strategies adopted for implementation of RNA-guided CRISPR/Cas9 genome editing with special emphasis on their application for metabolic engineering of yeast and bacteria. Also, examples of how nuclease-deficient Cas9 has been applied for RNA-guided transcriptional regulation of target genes will be reviewed, as well as tools available for computer-aided design of guide-RNAs will be highlighted. Finally, this review will provide a perspective on the immediate challenges and opportunities foreseen by the use of CRISPR/Cas9 genome engineering and regulation in the context of metabolic engineering.

The deletion of PHO13 (pho13Δ) in Saccharomyces cerevisiae, encoding a phosphatase enzyme of unknown specificity, results in the transcriptional activation of genes related to the pentose phosphate pathway (PPP) such as TAL1 encoding transaldolase. It has been also reported that the pho13Δ mutant of S. cerevisiae expressing a heterologous xylose pathway can metabolize xylose efficiently compared to its parental strain. However, the interaction between the pho13Δ-induced transcriptional changes and the phenotypes of xylose fermentation was not understood. Thus we investigated the global metabolic changes in response to pho13Δ when cells were exponentially growing on xylose. Among the 134 intracellular metabolites that we identified, the 98% reduction of sedoheptulose was found to be the most significant change in the pho13Δ mutant as compared to its parental strain. Because sedoheptulose-7-phosphate (S7P), a substrate of transaldolase, reduced significantly in the pho13Δ mutant as well, we hypothesized that limited transaldolase activity in the parental strain might cause dephosphorylation of S7P, leading to carbon loss and inefficient xylose metabolism. Mutants overexpressing TAL1 at different degrees were constructed, and their TAL1 expression levels and xylose consumption rates were positively correlated. Moreover, as TAL1 expression levels increased, intracellular sedoheptulose concentration dropped significantly. Therefore, we concluded that TAL1 upregulation, preventing the accumulation of sedoheptulose, is the most critical mechanism for the improved xylose metabolism by the pho13Δ mutant of engineered S. cerevisiae.

As an alternative to the use of cytochalasin B (CB), 6-dimethylamino-purine (6-DMAP) and thermal shock (heat shock by increasing the temperature from 25 to 36°C) could be used to induce tetraploidy in Pacific oyster (Crassostrea gigas) diploids. Induction was performed by applying shocks after elimination of the first polar corpuscle at the end of meiosis I. Ploidy rates were verified using flow cytometry. Tetraploid larvae were obtained using all inductor (6-DMAP, thermal shock and CB) treatments. No difference in the efficiency of tetraploidy induction was noted among 6-DMAP, thermal shock and CB. The number of D-larvae and their yield, determined by calculating the percentage of well-formed D-larvae in relation to the total number of larvae, was similar (p > 0.05) among the evaluated induction methods. We suggest that 6-DMAP and thermal shock should be used in tetraploidy induction protocols, thereby avoiding the use of CB, which is a harmful agent for both humans and the environment. [ABSTRACT FROM AUTHOR]

This article examines the cross-cultural bioethical concerns stemming from the potential use of CRISPR-Cas9 for genetic enhancement projects. It emphasizes the need to differentiate between basic and non-basic human rights when considering genetic enhancement, as recent international declarations lack this distinction. Basic rights possess a universal nature and are applicable across cultures, while non-basic rights are culturally specific and should be determined within respective regions. To illustrate this, the study explores the acceptance or rejection of non-basic rights related to genetic enhancement in two distinct cultural categories: Type-A and Type-B cultures. Type-A cultures predominantly adhere to a liberal moral framework, while Type-B cultures are rooted in Confucian morality. Additionally, the article argues for two basic rights in genetic enhancement: the right to be free from bodily harm and the right to be free from deception. These rights differ from non-basic rights and should be universally upheld in all cultures. By analyzing a hypothetical case and drawing parallels with the He Jiankui incident, the article investigates the violation of these two basic rights in each scenario, regardless of cultural context. Consequently, both cases should be unequivocally rejected in both Type-A and Type-B cultures., (© The Author(s) 2024. Published by Oxford University Press, on behalf of the Journal of Medicine and Philosophy Inc. All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.)

Considering public moral attitudes is a hallmark of the anticipatory governance of emerging biotechnologies, such as heritable human genome editing. However, such anticipatory governance often overlooks that future morality is open to change and that future generations may perform different moral assessments on the very biotechnologies we are trying to govern in the present. In this article, we identify an 'anticipatory gap' that has not been sufficiently addressed in the discussion on the public governance of heritable genome editing, namely, uncertainty about the moral visions of future generations about the emerging applications that we are currently attempting to govern now. This paper motivates the relevance of this anticipatory gap, identifying the challenges it generates and offering various recommendations so that moral uncertainty does not lead to governance paralysis with regard to human germline genome editing., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. Re-use permitted under CC BY. Published by BMJ.)

Advances in synthetic biology and metabolic engineering have enabled the construction of novel biological routes to valuable chemicals using suitable microbial hosts. Aldehydes serve as chemical feedstocks in the synthesis of rubbers, plastics, and other larger molecules. Microbial production of alkanes is dependent on the formation of a fatty aldehyde intermediate which is converted to an alkane by an aldehyde deformylating oxygenase (ADO). However, microbial hosts such as Escherichia coli are plagued by many highly active endogenous aldehyde reductases (ALRs) that convert aldehydes to alcohols, which greatly complicates strain engineering for aldehyde and alkane production. It has been shown that the endogenous ALR activity outcompetes the ADO enzyme for fatty aldehyde substrate. The large degree of ALR redundancy coupled with an incomplete database of ALRs represents a significant obstacle in engineering E. coli for either aldehyde or alkane production. In this study, we identified 44 ALR candidates encoded in the E. coli genome using bioinformatics tools, and undertook a comprehensive screening by measuring the ability of these enzymes to produce isobutanol. From the pool of 44 candidates, we found five new ALRs using this screening method (YahK, DkgA, GldA, YbbO, and YghA). Combined deletions of all 13 known ALRs resulted in a 90-99% reduction in endogenous ALR activity for a wide range of aldehyde substrates (C2-C12). Elucidation of the ALRs found in E. coli could guide one in reducing competing alcohol formation during alkane or aldehyde production.

Transgenic microalgae have the potential to impact many diverse biotechnological industries including energy, human and animal nutrition, pharmaceuticals, health and beauty, and specialty chemicals. However, major obstacles to sophisticated genetic and metabolic engineering in algae have been the lack of well-characterized transformation vectors to direct engineered gene products to specific subcellular locations, and the inability to robustly express multiple nuclear-encoded transgenes within a single cell. Here we validate a set of genetic tools that enable protein targeting to distinct subcellular locations, and present two complementary methods for multigene engineering in the eukaryotic green microalga Chlamydomonas reinhardtii. The tools described here will enable advanced metabolic and genetic engineering to promote microalgae biotechnology and product commercialization.

Simultaneous occurrence of drought and heat stress will have significant negative impact on rice yield, especially under upland conditions. The projected increase in global temperatures and reduced precipitation will increase the frequency of occurrence and intensity of these stresses, threatening rice production. Despite recognizing the importance of combined stress in rice, the knowledge generated in this area is very limited. Though complex, understanding combined stress tolerance of rice under water saving cultivation is more critical towards development of climate resilient rice cultivars. Here, we summarized the effects of combined stress on rice physiology with more emphasis on reproductive stage. Omics responses, phenotyping and physiology challenges and potential strategies for improving combined stress tolerance in rice are also discussed. [ABSTRACT FROM AUTHOR]

Study Question: To what extent do characteristics of germline genome editing (GGE) determine whether the general public supports permitting the clinical use of GGE?Summary Answer: The risk that GGE would cause congenital abnormalities had the largest effect on support for allowing GGE, followed by effectiveness of GGE, while costs, the type of application (disease or enhancement) and the effect on child well-being had moderate effects.What Is Known Already: Scientific progress on GGE has increased the urgency of resolving whether and when clinical application of GGE may be ethically acceptable. Various expert bodies have suggested that the treatment characteristics will be key in determining whether GGE is acceptable. For example, GGE with substantial risks (e.g. 15% chance of a major congenital abnormality) may be acceptable to prevent a severe disease but not to enhance non-medical characteristics or traits of an otherwise healthy embryo (e.g. eye colour or perhaps in the future more complex traits, such as intelligence). While experts have called for public engagement, it is unclear whether and how much the public acceptability of GGE is affected by the treatment characteristics proposed by experts.Study Design, Size, Duration: The vignette-based survey was disseminated in 2018 among 1857 members of the Dutch general public. An online research panel was used to recruit a sample representing the adult Dutch general public.Participants/materials, Setting, Methods: A literature review identified the key treatment characteristics of GGE: the effect on the well-being of the future child, use for disease or enhancement, risks for the future child, effectiveness (here defined as the chance of a live birth, assuming that if the GGE was not successful, the embryo would not be transferred), cost and availability of alternative treatments/procedures to prevent the genetic disease or provide enhancement (i.e. preimplantation genetic testing (PGT)), respectively. For each treatment characteristic, 2-3 levels were defined to realistically represent GGE and its current alternatives, donor gametes and ICSI with PGT. Twelve vignettes were created by fractional factorial design. A multinominal logit model assessed how much each treatment characteristic affected participants' choices.Main Results and the Role Of Chance: The 1136 respondents (response rate 61%) were representative of the Dutch adult population in several demographics. Respondents were between 18 and 89 years of age. When no alternative treatment/procedure is available, the risk that GGE would cause (other) congenital abnormalities had the largest effect on whether the Dutch public supported allowing GGE (coefficient = -3.07), followed by effectiveness (coefficient = 2.03). Costs (covered by national insurance, coefficient = -1.14), the type of application (disease or enhancement; coefficient = -1.07), and the effect on child well-being (coefficient = 0.97) had similar effects on whether GGE should be allowed. If an alternative treatment/procedure (e.g. PGT) was available, participants were not categorically opposed to GGE, however, they were strongly opposed to using GGE for enhancement (coefficient = -3.37). The general acceptability of GGE was higher than participants' willingness to personally use it (P < 0.001). When participants considered whether they would personally use GGE, the type of application (disease or enhancement) was more important, whereas effectiveness and costs (covered by national insurance) were less important than when they considered whether GGE should be allowed. Participants who were male, younger and had lower incomes were more likely to allow GGE when no alternative treatment/procedure is available.Limitations, Reasons For Caution: Some (e.g. ethnic, religious) minorities were not well represented. To limit complexity, not all characteristics of GGE could be included (e.g. out-of-pocket costs), therefore, the views gathered from the vignettes reflect only the choices presented to the respondents. The non-included characteristics could be connected to and alter the importance of the studied characteristics. This would affect how closely the reported coefficients reflect 'real-life' importance.Wider Implications Of the Findings: This study is the first to quantify the substantial impact of GGE's effectiveness, costs (covered by national insurance), and effect on child well-being on whether the public considered GGE acceptable. In general, the participants were strikingly risk-averse, in that they weighed the risks of GGE more heavily than its benefits. Furthermore, although only a single study in one country, the results suggests that-if sufficiently safe and effective-the public may approve of using GGE (presumably combined with PGT) instead of solely PGT to prevent passing on a disease. The reported public views can serve as input for future consideration of the ethics and governance of GGE.Study Funding/competing Interest(s): Young Academy of the Royal Dutch Academy of Sciences (UPS/RB/745), Alliance Grant of the Amsterdam Reproduction and Development Research Institute (2017-170116) and National Institutes of Health Intramural Research Programme. No competing interests.Trial Registration Number: N/A. [ABSTRACT FROM AUTHOR]

Crossbreeding is used to increase production and disease resistance in adult animals, and there is no research to assess the performance of animals in the early stages. The aim of this study was to evaluate the zootechnical and health performance of Holstein x Gir calves (½ HG: ½ Dutch ½ Gir and ¾ HG: ¾ Dutch ¼ Gir), from birth to 80 days of age, and compare metabolic parameters between groups. In this sense, calves were monitored for zootechnical parameters; epidemiological indexes such as morbidity, mortality, recurrence of diarrhea, pneumonia, and other diseases; as well as serum concentrations of aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase, gamma-glutamyl transferase, total proteins, cholesterol, triglycerides, albumin, urea, and paraoxonase1 (PON1). ¾ HG calves showed higher morbidity for diarrhea and remained with diarrhea for longer compared to ½ HG calves, and this was reflected in the average daily weight gain until the 42nd day, with ½ HG calves performing better. There were no differences regarding passive immune transfer between groups, as well as no differences in morbidity and mortality from pneumonia. Regarding biochemical analyses, a difference was found only in the concentrations of PON1, which were higher in ¾ HG calves. The findings show that blood degree influences the occurrence and duration of diarrhea, negatively impacting the zootechnical performance of the animals. Crossbreeding bulls with zebu cattle can be an alternative to increase calf resistance and reduce diarrhea, thus lowering economic losses and improving animal performance. [ABSTRACT FROM AUTHOR]