scholarly journals Local adaptation and maladaptation during the worldwide range expansion of a selffertilizing plant

2018 ◽  
Author(s):  
A. Cornille ◽  
A. Salcedo ◽  
H. Huang ◽  
D. Kryvokhyzha ◽  
K. Holm ◽  
...  
Keyword(s):  
Local Adaptation ◽  
Range Expansion ◽  
Genetic Basis ◽  
Population History ◽  
Local Conditions ◽  
East Europe ◽  
Common Gardens ◽  
Genetic Clusters ◽  
The Common ◽  
Older Populations

AbstractSpecies having experienced rapid range expansion represent unique opportunities to evaluate the dynamics of adaptation during colonization of new environments. We investigated the consequences of range expansion on local adaptation of a successful worldwide colonizer, the shepherd’s purse Capsella bursa-pastoris. This species is an annual weed that originated recently in Eurasia and has now broadly colonized both temperate and subtropical areas. We assessed the performance, genetic diversity, and phenology of field-collected accessions belonging to three distinct genetic clusters of decreasing age (Middle East, Europe and Asia) in three common gardens in Europe, Asia and North America. To understand the genetic basis of local adaptation in this species, we also tested for correlation between SNP allele frequencies and environmental factors in Europe and Asia. Overall, we showed that patterns of local adaptation depended on population history: some older populations were weakly adapted to local conditions while those closer to the front of the colonization wave, far from the origin of the species, were maladapted whatever the common gardens. Altogether, our results have important consequences for the understanding of the evolution and adaptation of self-fertilizing plant during range expansion.

scholarly journals Climate-driven divergent selection in a foundation tree species: QST-FST evidence from multiple common gardens

2021 ◽  
Author(s):  
Hillary Cooper ◽  
Gerard Allan ◽  
Lela Andrews ◽  
Rebecca Best ◽  
Kevin Grady ◽  
...  
Keyword(s):  
Local Adaptation ◽  
Tree Species ◽  
Divergent Selection ◽  
Population Variation ◽  
Population Divergence ◽  
Phenotypic Traits ◽  
Local Conditions ◽  
Basal Diameter ◽  
Common Gardens ◽  
Fremont Cottonwood

Widespread tree species span large climatic gradients that often lead to high levels of local adaptation and phenotypic divergence across their range. To evaluate the relative roles of selection and drift in driving divergence in phenotypic traits, we compared molecular and quantitative genetic variation in Populus fremontii (Fremont cottonwood), using data from > 9000 SNPs and genotypes from 16 populations reciprocally planted in three common gardens that span the species’ climatic range. We present three major findings: 1) There is significant within- and among-population variation in functional traits expressed in each of the common gardens. 2) There is evidence from all three gardens that population divergence in leaf phenology and specific leaf area has been driven by divergent selection (QST > FST). In contrast, QST-FST comparisons for performance traits like height and basal diameter were highly dependent on growing environment, indicating divergent, stabilizing, or no selection across the three gardens. We show this is likely due to local adaptation of source populations to contrasting growing environments. 3) Climate is a primary selective force driving trait divergence, where the traits showing the strongest correlations with a genotype’s provenance climate also had the highest QST values. We conclude that climatic gradients have contributed to significant phenotypic differences and local adaptation in Fremont cottonwood. These results are important because as climate is changing much more rapidly, traits such as phenology that are finely tuned to local conditions may now be subject to intense selection or quickly become maladaptive.

Hyperstimulation of the immune system as a cause of autoimmune diseases

2020 ◽  
Vol 75 (3) ◽  
pp. 204-213
Author(s):  
Varvara A. Ryabkova ◽  
Leonid P. Churilov ◽  
Yehuda Shoenfeld
Keyword(s):  
Immune System ◽  
Autoimmune Diseases ◽  
Genetic Basis ◽  
Threshold Model ◽  
Subsequent Development ◽  
Threshold Effect ◽  
Successful Management ◽  
Polygenic Inheritance ◽  
Autoimmune Pathology ◽  
The Common

The pathogenesis of autoimmune diseases is very complex and multi-factorial. The concept of Mosaics of Autoimmunity was introduced to the scientific community 30 years ago by Y. Shoenfeld and D.A. Isenberg, and since then new tiles to the puzzle are continuously added. This concept specifies general pathological ideas about the multifactorial threshold model for polygenic inheritance with a threshold effect by the action of a number of external causal factors as applied to the field of autoimmunology. Among the external factors that can excessively stimulate the immune system, contributing to the development of autoimmune reactions, researchers are particularly interested in chemical substances, which are widely used in pharmacology and medicine. In this review we highlight the autoimmune dynamics i.e. a multistep pathogenesis of autoimmune diseases and the subsequent development of lymphoma in some cases. In this context several issues are addressed namely, genetic basis of autoimmunity; environmental immunostimulatory risk factors; gene/environmental interaction; pre-clinical autoimmunity with the presence of autoantibodies; and the mechanisms, underlying lymphomagenesis in autoimmune pathology. We believe that understanding the common model of the pathogenesis of autoimmune diseases is the first step to their successful management.

scholarly journals Molecular Characterization of the Common Snook, Centropomus undecimalis (Bloch, 1792) in the Usumacinta Basin

Diversity ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 347
Author(s):  
Jazmín Terán-Martínez ◽  
Rocío Rodiles-Hernández ◽  
Marco A. A. Garduño-Sánchez ◽  
Claudia Patricia Ornelas-García
Keyword(s):  
Molecular Characterization ◽  
Conservation Status ◽  
Nuclear Data ◽  
Important Species ◽  
Common Snook ◽  
Mitochondrial Data ◽  
Haplotypic Diversity ◽  
Genetic Diversity And Structure ◽  
Genetic Clusters ◽  
The Common

The common snook is one of the most abundant and economically important species in the Usumacinta basin in the Gulf of Mexico, which has led to overfishing, threatening their populations. The main goal of the present study was to assess the genetic diversity and structure of the common snook along the Usumacinta River in order to understand the population dynamics and conservation status of the species. We characterized two mitochondrial markers (mtCox1 and mtCytb) and 11 microsatellites in the Usumacinta basin, which was divided into three zones: rainforest, floodplain and river delta. The mitochondrial data showed very low diversity, showing some haplotypic diversity differences between the rainforest and delta zones. In contrast, we consistently recovered two genetic clusters in the Usumacinta River basin with the nuclear data in both the DAPC and STRUCTURE analyses. These results were consistent with the AMOVA analyses, which showed significant differences among the genetic clusters previously recovered by DAPC and STRUCTURE. In terms of diversity distribution, the floodplain zone corresponded to the most diverse zone according to the mitochondrial and nuclear data, suggesting that this is a transition zone in the basin. Our results support the relevance of the molecular characterization and monitoring of the fishery resources at the Usumacinta River to better understand their connectivity, which could help in their conservation and management.

scholarly journals Prevalence of ACSL (rs6552828) polymorphism among runners

2019 ◽  
Vol 24 ◽  
pp. 121-128
Author(s):  
Sigal Ben-Zaken ◽  
Yoav Meckel ◽  
Dan Nemet ◽  
Alon Eliakim
Keyword(s):  
Single Nucleotide Polymorphism ◽  
Genetic Basis ◽  
Maximal Oxygen Consumption ◽  
Professional Athletes ◽  
Distance Runners ◽  
Nucleotide Polymorphism ◽  
Long Distance ◽  
Single Nucleotide ◽  
The Common

The ACSL A/G polymorphism is associated with endurance trainability. Previous studies have demonstrated that homozygotes of the minor AA allele had a reduced maximal oxygen consumption response to training compared to the common GG allele homozygotes, and that the ACSL A/G single nucleotide polymorphism explained 6.1% of the variance in the VO2max response to endurance training. The contribution of ACSL single nucleotide polymorphism to endurance trainability was shown in nonathletes, however, its potential role in professional athletes is not clear. Moreover, the genetic basis to anaerobic trainability is even less studied. Therefore, the aim of the present study was to examine the prevalence of ACSL single nucleotide polymorphism among professional Israeli long distance runners (n=59), middle distance runners (n=31), sprinters and jumpers (n=48) and non-athletic controls (n=60). The main finding of the present study was that the ACSL1 AA genotype, previously shown to be associated with reduced endurance trainability, was not higher among sprinters and jumpers (15%) compared to middle- (16%) and long-distance runners (15%). This suggests that in contrast to previous studies indicating that the ACSL1 single nucleotide polymorphism may influence endurance trainability among non-athletic individuals, the role of this polymorphism among professional athletes is still not clear.

scholarly journals Human mitochondrial DNA lineages in Iron-Age Fennoscandia suggest incipient admixture and eastern introduction of farming-related maternal ancestry

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Sanni Översti ◽  
Kerttu Majander ◽  
Elina Salmela ◽  
Kati Salo ◽  
Laura Arppe ◽  
...  
Keyword(s):  
Iron Age ◽  
High Mobility ◽  
Human Remains ◽  
Population History ◽  
Hunter Gatherers ◽  
East Europe ◽  
North East ◽  
Mtdna Diversity ◽  
The Baltic ◽  
Genetic Shift

AbstractHuman ancient DNA studies have revealed high mobility in Europe’s past, and have helped to decode the human history on the Eurasian continent. Northeastern Europe, especially north of the Baltic Sea, however, remains less well understood largely due to the lack of preserved human remains. Finland, with a divergent population history from most of Europe, offers a unique perspective to hunter-gatherer way of life, but thus far genetic information on prehistoric human groups in Finland is nearly absent. Here we report 103 complete ancient mitochondrial genomes from human remains dated to AD 300–1800, and explore mtDNA diversity associated with hunter-gatherers and Neolithic farmers. The results indicate largely unadmixed mtDNA pools of differing ancestries from Iron-Age on, suggesting a rather late genetic shift from hunter-gatherers towards farmers in North-East Europe. Furthermore, the data suggest eastern introduction of farmer-related haplogroups into Finland, contradicting contemporary genetic patterns in Finns.

scholarly journals New insights on adaptation and population structure of cork oak using genotyping by sequencing

2018 ◽  
Author(s):  
F. Pina-Martins ◽  
J. Baptista ◽  
G. Pappas ◽  
O. S. Paulo
Keyword(s):  
Local Adaptation ◽  
Tree Species ◽  
Evolutionary History ◽  
Genotyping By Sequencing ◽  
Climatic Changes ◽  
Cork Oak ◽  
Ecological Modelling ◽  
Local Context ◽  
Evergreen Forest ◽  
Local Conditions

AbstractSpecies respond to global climatic changes in a local context. Understanding this process is paramount due to the pace of these changes. Tree species are particularly interesting to study in this regard due to their long generation times, sedentarism, and ecological and economic importance. Quercus suber L. is an evergreen forest tree species of the Fagaceae family with an essentially Western Mediterranean distribution. Despite frequent assessments of the species’ evolutionary history, large-scale genetic studies have mostly relied on plastidial markers, whereas nuclear markers have been used on studies with locally focused sampling strategies. The potential response of Q. suber to global climatic changes has also been studied, under ecological modelling. In this work, “Genotyping by Sequencing” (GBS) is used to derive 2,547 SNP markers to assess the species’ evolutionary history from a nuclear DNA perspective, gain insights on how local adaptation may be shaping the species’ genetic background, and to forecast how Q. suber may respond to global climatic changes from a genetic perspective. Results reveal an essentially unstructured species, where a balance between gene flow and local adaptation keeps the species’ gene pool somewhat homogeneous across its distribution, but at the same time allows variation clines for the individuals to cope with local conditions. “Risk of Non-Adaptedness” (RONA) analyses, suggest that for the considered variables and most sampled locations, the cork oak does not require large shifts in allele frequencies to survive the predicted climatic changes. However, more research is required to integrate these results with those of ecological modelling.

scholarly journals The role of environment, local adaptation and past climate fluctuation on the amount and distribution of genetic diversity in the teosinte in Mexico

2019 ◽  
Author(s):  
Jaime Gasca-Pineda ◽  
Yocelyn T. Gutiérrez-Guerrero ◽  
Erika Aguirre-Planter ◽  
Luis E. Eguiarte
Keyword(s):  
Genetic Diversity ◽  
Local Adaptation ◽  
Environmental Conditions ◽  
Wide Distribution ◽  
Wide Range ◽  
Significant Genetic Structure ◽  
Nuclear Microsatellite ◽  
Genetic Clusters ◽  
Assignment Analysis ◽  
Climate Fluctuation

AbstractWild maize, commonly known as teosinte, has a wide distribution in central Mexico and inhabits a wide range of environmental conditions. According to previous studies, the environment is a determinant factor for the amount and distribution of genetic diversity. In this study, we used a set of neutral markers to explore the influence of contemporary factors and historical environmental shifts on genetic diversity, including present and three historical periods. Using a set of 22 nuclear microsatellite loci, we genotyped 527 individuals from 29 localities. We found highly variable levels of genetic diversity (Z. m. parviglumis HE= 0.3646–0.7699; Z. m. mexicana HE= 0.5885–0.7671) and significant genetic structure among localities (average DEST= 0.4332). Also, we recovered significant values of heterozygote deficiency (average FIS= 0.1796) and variable levels of selfing (sg2=0.0–0.3090). The Bayesian assignment analysis yielded four genetic clusters dividing the sample into subspecies, that in turn, were separated into two clusters. Environmental conditions played a strong influence in the distribution of genetic diversity, as demographic analysis and changes in species range revealed by modeling analyses were consistent. We conclude that current genetic diversity in teosinte is the result of a mixture of local adaptation and genetic isolation along with historical environmental fluctuations.

scholarly journals Homozygosity for TYK2 P1104A underlies tuberculosis in about 1% of patients in a cohort of European ancestry

2019 ◽  
Vol 116 (21) ◽  
pp. 10430-10434 ◽  
Author(s):  
Gaspard Kerner ◽  
Noe Ramirez-Alejo ◽  
Yoann Seeleuthner ◽  
Rui Yang ◽  
Masato Ogishi ◽  
...  
Keyword(s):  
Odds Ratio ◽  
Genetic Basis ◽  
Sub Saharan Africa ◽  
European Ancestry ◽  
Uk Biobank ◽  
The United Kingdom ◽  
The Common ◽  
Sub Saharan ◽  
The Uk ◽  
High Level

The human genetic basis of tuberculosis (TB) has long remained elusive. We recently reported a high level of enrichment in homozygosity for the common TYK2 P1104A variant in a heterogeneous cohort of patients with TB from non-European countries in which TB is endemic. This variant is homozygous in ∼1/600 Europeans and ∼1/5,000 people from other countries outside East Asia and sub-Saharan Africa. We report a study of this variant in the UK Biobank cohort. The frequency of P1104A homozygotes was much higher in patients with TB (6/620, 1%) than in controls (228/114,473, 0.2%), with an odds ratio (OR) adjusted for ancestry of 5.0 [95% confidence interval (CI): 1.96–10.31, P = 2 × 10−3]. Conversely, we did not observe enrichment for P1104A heterozygosity, or for TYK2 I684S or V362F homozygosity or heterozygosity. Moreover, it is unlikely that more than 10% of controls were infected with Mycobacterium tuberculosis, as 97% were of European genetic ancestry, born between 1939 and 1970, and resided in the United Kingdom. Had all of them been infected, the OR for developing TB upon infection would be higher. These findings suggest that homozygosity for TYK2 P1104A may account for ∼1% of TB cases in Europeans.

scholarly journals Safety culture regarding zoonoses on domestic ruminant farms

2020 ◽  
Vol 51 (2) ◽  
pp. 199-206
Author(s):  
Jože Starič ◽  
Risto Rautiainen ◽  
Jarkko Leppälä ◽  
Nataša Janev Holcer ◽  
Jožica Ježek ◽  
...  
Keyword(s):  
Safety Culture ◽  
Health And Safety ◽  
Employee Attitudes ◽  
Zoonotic Diseases ◽  
East Europe ◽  
South East Europe ◽  
Domestic Ruminants ◽  
Protective Behaviour ◽  
Livestock Sector ◽  
The Common

Veterinarians in buiatric practice, alongside veterinary care and animal welfare, are also responsible for protecting assisting personnel and those working on the holding from zoonoses. Therefore, they need to be knowledgeable about common zoonotic diseases of ruminants, in particular, and protection from their contraction. Veterinarians should know which zoonotic diseases are present in their country and neighbouring countries to be prepared to advise. Zoonotic diseases of ruminants often show no typical clinical presentation, so awareness of self-protective behaviour when dealing with animals in the prevention of zoonoses is very important. This article provides a review of the common zoonoses of domestic ruminants in South-East Europe that are transmitted when handling animals, and their manner of transmission to humans. Safety culture in ruminant production relates to employee attitudes and behaviour concerning health and safety, which also has a significant impact on zoonosis prevention. Improving the safety culture among livestock sector workers and worker behaviours that prevent the risk of zoonoses are also discussed.

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