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1.
Nat Commun ; 11(1): 5351, 2020 10 22.
Artigo em Inglês | MEDLINE | ID: mdl-33093449

RESUMO

MicroRNAs (miRNAs) and natural antisense transcripts (NATs) control many biological processes and have been broadly applied for genetic manipulation of eukaryotic gene expression. Still unclear, however, are whether and how NATs regulate miRNA production. Here, we report that the cis-NATs of MIR398 genes repress the processing of their pri-miRNAs. Through genome-wide analysis of RNA sequencing data, we identify cis-NATs of MIRNA genes in Arabidopsis and Brassica. In Arabidopsis, MIR398b and MIR398c are coexpressed in vascular tissues with their antisense genes NAT398b and NAT398c, respectively. Knock down of NAT398b and NAT398c promotes miR398 processing, resulting in stronger plant thermotolerance owing to silencing of miR398-targeted genes; in contrast, their overexpression activates NAT398b and NAT398c, causing poorer thermotolerance due to the upregulation of miR398-targeted genes. Unexpectedly, overexpression of MIR398b and MIR398c activates NAT398b and NAT398c. Taken together, these results suggest that NAT398b/c repress miR398 biogenesis and attenuate plant thermotolerance via a regulatory loop.


Assuntos
Arabidopsis/genética , Arabidopsis/fisiologia , Brassica rapa/genética , Brassica rapa/fisiologia , MicroRNAs/genética , RNA Antissenso/genética , Termotolerância/genética , Termotolerância/fisiologia , Regulação da Expressão Gênica de Plantas , Técnicas de Silenciamento de Genes , Genes de Plantas , MicroRNAs/metabolismo , Modelos Biológicos , Mutação , Plantas Geneticamente Modificadas , Processamento Pós-Transcricional do RNA , Estabilidade de RNA , RNA Antissenso/metabolismo
2.
Nat Commun ; 11(1): 5441, 2020 10 28.
Artigo em Inglês | MEDLINE | ID: mdl-33116138

RESUMO

With global warming and climate change, breeding crop plants tolerant to high-temperature stress is of immense significance. tRNA 2-thiolation is a highly conserved form of tRNA modification among living organisms. Here, we report the identification of SLG1 (Slender Guy 1), which encodes the cytosolic tRNA 2-thiolation protein 2 (RCTU2) in rice. SLG1 plays a key role in the response of rice plants to high-temperature stress at both seedling and reproductive stages. Dysfunction of SLG1 results in plants with thermosensitive phenotype, while overexpression of SLG1 enhances the tolerance of plants to high temperature. SLG1 is differentiated between the two Asian cultivated rice subspecies, indica and japonica, and the variations at both promoter and coding regions lead to an increased level of thiolated tRNA and enhanced thermotolerance of indica rice varieties. Our results demonstrate that the allelic differentiation of SLG1 confers indica rice to high-temperature tolerance, and tRNA thiolation pathway might be a potential target in the next generation rice breeding for the warming globe.


Assuntos
Genes de Plantas , Oryza/genética , Oryza/fisiologia , Termotolerância/genética , Termotolerância/fisiologia , Variação Genética , Aquecimento Global , Modelos Biológicos , Melhoramento Vegetal , Proteínas de Plantas/genética , Proteínas de Plantas/fisiologia , Regiões Promotoras Genéticas , Processamento Pós-Transcricional do RNA/genética , Processamento Pós-Transcricional do RNA/fisiologia , RNA de Plantas/metabolismo , RNA de Transferência/metabolismo , Tionucleotídeos/metabolismo
3.
PLoS One ; 15(10): e0239605, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33006971

RESUMO

The lily, a famous bulbous flower, is seriously affected by high temperatures, which affect their growth and production. To date, the signalling pathways and the molecular mechanisms related to heat response in Lilium have not been elucidated. In this study, a comparative transcriptome analysis was performed in an important thermo-tolerant flower, L. longiflorum, and a thermo-sensitive flower, L. distichum. Lily seedlings were first exposed to heat stress at 42°C for different lengths of time, and the optimal time-points (2 h and 24 h) were selected for RNA sequencing (RNA-seq). Approximately 66.51, 66.21, and 65.36 Mb clean reads were identified from three libraries of L. longiflorum (LL_CK, LL_T2h and LL_T24h, respectively) and 66.18, 66.03, and 65.16 Mb clean reads were obtained from three libraries of L. distichum (LD_CK, LD_T2h and LD_T24h, respectively) after rRNA removing. A total of 34,301 unigenes showed similarity to known proteins in the database NCBI non-redundant protein (NR), Swiss-Prot proteins, InterPro proteins, Clusters of Orthologous Groups (COG) and Kyoto Encyclopedia of Genes and Genomes (KEGG). In addition, 1,621 genes were differentially expressed in the overlapping libraries between LL_DEGs and LD_DEGs; of these genes, 352 DEGs were obviously upregulated in L. longiflorum and downregulated in L. distichum during heat stress, including 4-coumarate, CoA ligase (4CL), caffeoyl-CoA O-methyltransferase (CCoAOMT), peroxidase, pathogenesis-related protein 10 family genes (PR10s), 14-3-3 protein, leucine-rich repeat receptor-like protein kinase, and glycine-rich cell wall structural protein-like. These genes were mainly involved in metabolic pathways, phenylpropanoid biosynthesis, plant-pathogen interactions, plant hormone signal transduction, and kinase signalling pathways. Quantitative RT-PCR was performed to validate the expression profiling of these DEGs in RNA-seq data. Taken together, the results obtained in the present study provide a comprehensive sequence resource for the discovery of heat-resistance genes and reveal potential key components that are responsive to heat stress in lilies, which may help to elucidate the heat signal transcription networks and facilitate heat-resistance breeding in lily.


Assuntos
Lilium/genética , Lilium/fisiologia , Perfilação da Expressão Gênica , Regulação da Expressão Gênica de Plantas , Genes de Plantas , Fatores de Transcrição de Choque Térmico/genética , Fatores de Transcrição de Choque Térmico/fisiologia , Resposta ao Choque Térmico/genética , Resposta ao Choque Térmico/fisiologia , Lilium/crescimento & desenvolvimento , Redes e Vias Metabólicas/genética , Anotação de Sequência Molecular , Família Multigênica , Proteínas de Plantas/genética , Proteínas de Plantas/fisiologia , RNA-Seq , Transdução de Sinais/genética , Especificidade da Espécie , Termotolerância/genética , Termotolerância/fisiologia
4.
PLoS One ; 15(8): e0236226, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32866160

RESUMO

Amine oxidases (AOs) including copper containing amine oxidases (CuAOs) and FAD-dependent polyamine oxidases (PAOs) are associated with polyamine catabolism in the peroxisome, apoplast and cytoplasm and play an essential role in growth and developmental processes and response to biotic and abiotic stresses. Here, we identified PAO genes in common wheat (Triticum aestivum), T. urartu and Aegilops tauschii and reported the genome organization, evolutionary features and expression profiles of the wheat PAO genes (TaPAO). Expression analysis using publicly available RNASeq data showed that TaPAO genes are expressed redundantly in various tissues and developmental stages. A large percentage of TaPAOs respond significantly to abiotic stresses, especially temperature (i.e. heat and cold stress). Some TaPAOs were also involved in response to other stresses such as powdery mildew, stripe rust and Fusarium infection. Overall, TaPAOs may have various functions in stress tolerances responses, and play vital roles in different tissues and developmental stages. Our results provided a reference for further functional investigation of TaPAO proteins.


Assuntos
Resposta ao Choque Frio/genética , Oxirredutases atuantes sobre Doadores de Grupo CH-NH/genética , Proteínas de Plantas/genética , Termotolerância/genética , Triticum/genética , Aegilops/enzimologia , Aegilops/genética , Processamento Alternativo , Sequência de Aminoácidos , Conjuntos de Dados como Assunto , Evolução Molecular , Perfilação da Expressão Gênica , Regulação da Expressão Gênica no Desenvolvimento , Regulação da Expressão Gênica de Plantas , Genes de Plantas , Genoma de Planta , Estudo de Associação Genômica Ampla , Cadeias de Markov , Modelos Genéticos , Peso Molecular , Família Multigênica , Oxirredutases atuantes sobre Doadores de Grupo CH-NH/química , Oxirredutases atuantes sobre Doadores de Grupo CH-NH/metabolismo , Filogenia , Proteínas de Plantas/química , Proteínas de Plantas/metabolismo , Domínios Proteicos/genética , RNA-Seq , Alinhamento de Sequência , Triticum/enzimologia
5.
Proc Natl Acad Sci U S A ; 117(34): 20908-20919, 2020 08 25.
Artigo em Inglês | MEDLINE | ID: mdl-32778598

RESUMO

Maintaining sufficient water transport during flowering is essential for proper organ growth, fertilization, and yield. Water deficits that coincide with flowering result in leaf wilting, necrosis, tassel browning, and sterility, a stress condition known as "tassel blasting." We identified a mutant, necrotic upper tips1 (nut1), that mimics tassel blasting and drought stress and reveals the genetic mechanisms underlying these processes. The nut1 phenotype is evident only after the floral transition, and the mutants have difficulty moving water as shown by dye uptake and movement assays. These defects are correlated with reduced protoxylem vessel thickness that indirectly affects metaxylem cell wall integrity and function in the mutant. nut1 is caused by an Ac transposon insertion into the coding region of a unique NAC transcription factor within the VND clade of Arabidopsis NUT1 localizes to the developing protoxylem of root, stem, and leaf sheath, but not metaxylem, and its expression is induced by flowering. NUT1 downstream target genes function in cell wall biosynthesis, apoptosis, and maintenance of xylem cell wall thickness and strength. These results show that maintaining protoxylem vessel integrity during periods of high water movement requires the expression of specialized, dynamically regulated transcription factors within the vasculature.


Assuntos
Termotolerância/genética , Xilema/metabolismo , Zea mays/metabolismo , Parede Celular/metabolismo , Secas , Regulação da Expressão Gênica de Plantas/genética , Temperatura Alta , Raízes de Plantas/metabolismo , Fatores de Transcrição/genética , Fatores de Transcrição/metabolismo , Xilema/genética , Zea mays/genética
6.
Nat Commun ; 11(1): 4212, 2020 08 24.
Artigo em Inglês | MEDLINE | ID: mdl-32839469

RESUMO

Phosphatases, together with kinases and transcription factors, are key components in cellular signalling networks. Here, we present a systematic functional analysis of the phosphatases in Cryptococcus neoformans, a fungal pathogen that causes life-threatening fungal meningoencephalitis. We analyse 230 signature-tagged mutant strains for 114 putative phosphatases under 30 distinct in vitro growth conditions, revealing at least one function for 60 of these proteins. Large-scale virulence and infectivity assays using insect and mouse models indicate roles in pathogenicity for 31 phosphatases involved in various processes such as thermotolerance, melanin and capsule production, stress responses, O-mannosylation, or retromer function. Notably, phosphatases Xpp1, Ssu72, Siw14, and Sit4 promote blood-brain barrier adhesion and crossing by C. neoformans. Together with our previous systematic studies of transcription factors and kinases, our results provide comprehensive insight into the pathobiological signalling circuitry of C. neoformans.


Assuntos
Cryptococcus neoformans/genética , Proteínas Fúngicas/genética , Perfilação da Expressão Gênica/métodos , Genoma Fúngico/genética , Estudo de Associação Genômica Ampla/métodos , Monoéster Fosfórico Hidrolases/genética , Animais , Análise por Conglomerados , Criptococose/microbiologia , Cryptococcus neoformans/patogenicidade , Feminino , Proteínas Fúngicas/classificação , Proteínas Fúngicas/metabolismo , Regulação Fúngica da Expressão Gênica , Camundongos Endogâmicos , Monoéster Fosfórico Hidrolases/classificação , Monoéster Fosfórico Hidrolases/metabolismo , Fosfotransferases/classificação , Fosfotransferases/genética , Fosfotransferases/metabolismo , Transdução de Sinais/genética , Termotolerância/genética , Fatores de Transcrição/classificação , Fatores de Transcrição/genética , Fatores de Transcrição/metabolismo , Virulência/genética
7.
Nat Commun ; 11(1): 4344, 2020 08 28.
Artigo em Inglês | MEDLINE | ID: mdl-32859906

RESUMO

Self-propagating drive systems are capable of causing non-Mendelian inheritance. Here, we report a drive system in yeast referred to as a chromosome drive that eliminates the target chromosome via CRISPR-Cas9, enabling the transmission of the desired chromosome. Our results show that the entire Saccharomyces cerevisiae chromosome can be eliminated efficiently through only one double-strand break around the centromere via CRISPR-Cas9. As a proof-of-concept experiment of this CRISPR-Cas9 chromosome drive system, the synthetic yeast chromosome X is completely eliminated, and the counterpart wild-type chromosome X harboring a green fluorescent protein gene or the components of a synthetic violacein pathway are duplicated by sexual reproduction. We also demonstrate the use of chromosome drive to preferentially transmit complex genetic traits in yeast. Chromosome drive enables entire chromosome elimination and biased inheritance on a chromosomal scale, facilitating genomic engineering and chromosome-scale genetic mapping, and extending applications of self-propagating drives.


Assuntos
Sistemas CRISPR-Cas , Cromossomos/genética , Repetições Palindrômicas Curtas Agrupadas e Regularmente Espaçadas , Saccharomyces cerevisiae/genética , Centrômero , Indóis , Redes e Vias Metabólicas/genética , Saccharomyces cerevisiae/metabolismo , Biologia Sintética/métodos , Termotolerância/genética , Sequenciamento Completo do Genoma
8.
Ecotoxicol Environ Saf ; 202: 110877, 2020 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-32574862

RESUMO

Heat stress has been a major environmental factor limiting the growth and development of Pinellia ternata which is an important Chinese traditional medicine. It has been reported that spermidine (SPD) and melatonin (MLT) play pivotal roles in modulating heat stress response (HSR). However, the roles of SPD and MLT in HSR of P. ternata, and the potential mechanism is still unknown. Here, exogenous SPD and MLT treatments alleviated heat-induced damages in P. ternata, which was supported by the increased chlorophyll content, OJIP curve, and relative water content, and the decreased malondialdehyde and electrolyte leakage. Then, RNA sequencing between CK (control) and Heat (1 h of heat treatment) was conducted to analyze how genes were in response to short-term heat stress in P. ternata. A total of 14,243 (7870 up- and 6373 down-regulated) unigenes were differentially expressed after 1 h of heat treatment. Bioinformatics analysis revealed heat-responsive genes mainly included heat shock proteins (HSPs), ribosomal proteins, ROS-scavenging enzymes, genes involved in calcium signaling, hormone signaling transduction, photosynthesis, pathogen resistance, and transcription factors such as heat stress transcription factors (HSFs), NACs, WRKYs, and bZIPs. Among them, PtABI5, PtNAC042, PtZIP17, PtSOD1, PtHSF30, PtHSFB2b, PtERF095, PtWRKY75, PtGST1, PtHSP23.2, PtHSP70, and PtLHC1 were significantly regulated by SPD or MLT treatment with same or different trends under heat stress condition, indicating that exogenous application of MLT and SPD might enhance heat tolerance in P. ternata through regulating these genes but may with different regulatory patterns. These findings contributed to the identification of potential genes involved in short-term HSR and the improved thermotolerance by MLT and SPD in P. ternata, which provided important clues for improving thermotolerance of P. ternata.


Assuntos
Melatonina/metabolismo , Pinellia/fisiologia , Espermidina/metabolismo , Termotolerância/genética , Clorofila/metabolismo , Regulação para Baixo/efeitos dos fármacos , Perfilação da Expressão Gênica , Proteínas de Choque Térmico/metabolismo , Resposta ao Choque Térmico/efeitos dos fármacos , Resposta ao Choque Térmico/fisiologia , Temperatura Alta , Fotossíntese/efeitos dos fármacos , Pinellia/genética , Pinellia/metabolismo , Análise de Sequência de RNA , Termotolerância/efeitos dos fármacos , Transcriptoma/efeitos dos fármacos
9.
Appl Environ Microbiol ; 86(16)2020 08 03.
Artigo em Inglês | MEDLINE | ID: mdl-32503909

RESUMO

YafQ is an endoribonuclease toxin that degrades target gene transcripts such as that of tnaA, a gene encoding tryptophanase to synthesize indole from tryptophan. DinJ is the cognate antitoxin of YafQ, and the YafQ-DinJ system was reported to regulate persister formation by controlling indole production in Escherichia coli In this study, we investigated the role of YafQ-DinJ, indole production, and persister population in bacterial heat tolerance. yafQ (ΔyafQ), dinJ (ΔdinJ), and tnaA (ΔtnaA) single-gene knockout mutants showed approximately 10-fold higher heat tolerance than wild-type (WT) E. coli BW25113. Persister fractions of all mutants were slightly larger than that of the WT. Interestingly, these persister cells showed an approximately 100-fold higher heat tolerance than normal cells, but there was no difference among the persister cells of all mutants and the WT in terms of heat tolerance. Indole and its derivatives promoted a drastic reduction of bacterial heat tolerance by just 10 min of pretreatment, which is not sufficient to affect persister formation before heat treatment. Surprisingly, indole and its derivatives also reduced the heat tolerance of persister cells. Among the tested derivatives, 5-iodoindole exhibited the strongest effect on both normal and persister cells.IMPORTANCE Our study demonstrated that a small persister population exhibits significantly higher heat tolerance than normal cells and that this small fraction contributes to the heat tolerance of the total bacterial population. This study also demonstrated that indole, known to inhibit persister formation, and its derivatives are very promising candidates to reduce the heat tolerance of not only normal bacterial cells but also persister cells.


Assuntos
Toxinas Bacterianas/genética , Proteínas de Escherichia coli/genética , Escherichia coli/fisiologia , Indóis/metabolismo , Termotolerância/genética , Toxinas Bacterianas/metabolismo , Escherichia coli/genética , Proteínas de Escherichia coli/metabolismo
10.
J Anim Sci ; 98(5)2020 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-32315036

RESUMO

Bos taurus indicus cattle have the superior ability for the regulation of body temperature during heat stress due to a number of physiological and cellular level adaptive traits. The objectives of this study were to quantify the change in body temperature in heifers with various proportions of Brahman genes per unit increase in heat stress as measured by temperature-humidity index (THI) and to assess how different breed groups responded to varying intensity and duration of heat stress. A total of 299 two-yr-old heifers from six breed groups ranging from 100% Angus to 100% Brahman were evaluated under hot and humid conditions during 2017 and 2018 summer days. Two strategies were used to estimate the plasticity in body temperature of breed groups in response to environmental challenges: 1) a random regression mixed model was used to estimate reaction norm parameters for each breed group in response to a specified environmental heat stress and 2) a repeated measures mixed model was used to evaluate the response to different environmental heat loads. The reaction norm model estimated an intercept and slope measuring the change in body temperature per unit increase in THI environmental heat stress for different breed groups of animals and allowed the identification of genotypes which are robust, with low slope values indicative of animals that are able to maintain normal body temperature across a range of environments. The repeated measures mixed model showed that Brahman cattle have an advantage under moderate or high heat stress conditions but both Angus and Brahman breed groups are greatly affected when heat stress is severe. A critical factor appears to be the opportunity to cool down during the night hours more than the number of hours with extreme THI. With heat stress conditions predicted to intensify and expand into currently temperate zones, developing effective strategies to ensure sustainable beef production systems are imperative. Effective strategies will require the identification of the genes conferring the superior thermotolerance in Brahman cattle.


Assuntos
Bovinos/genética , Transtornos de Estresse por Calor/veterinária , Termotolerância/genética , Animais , Temperatura Corporal/genética , Feminino , Predisposição Genética para Doença , Transtornos de Estresse por Calor/genética , Resposta ao Choque Térmico , Temperatura Alta , Umidade , Estações do Ano , Temperatura
11.
Artigo em Inglês | MEDLINE | ID: mdl-32114414

RESUMO

Heat shock transcription factors (Hsfs) play an important role in regulating heat stress response in plants. Our previous study found that there were 82 non-redundant Hsfs in wheat, 18 of which belonged to subclass A2. In this study, we cloned an A2 member, TaHsfA2-1, which encoded a protein of 346 amino acid residues in wheat. The fusion protein TaHsfA2-1-GFP was localized in the nucleus under normal growth conditions. TaHsfA2-1 was expressed in nearly all the measured tissues, most highly in mature leaves. The expression level of TaHsfA2-1 can be enhanced by heat stress, PEG stress, and signal molecules such as H2O2 and SA. Yeast cells transformed with TaHsfA2-1 improved thermotolerance compared to those with the empty vector. TaHsfA2-1-overexpressing Arabidopsis displayed a better growth state with more green leaves than wild-type seedlings after heat stress. Accordingly, the chlorophyll content and survival rate in the transgenic lines were higher than in the wild type, and relative conductivity in the transgenic lines was lower than in the wild type. Further research found that TaHsfA2-1-overexpressing Arabidopsis up-regulated the expression of some heat shock protein genes (Hsps) compared to wild type after heat stress. These results suggested that TaHsfA2-1 is a new gene that improves thermotolerance in plants by mediating the expression of Hsps. A functional gene was provided for molecular breeding in the subsequent research.


Assuntos
Regulação da Expressão Gênica de Plantas/fisiologia , Fatores de Transcrição de Choque Térmico/genética , Proteínas de Plantas/genética , Termotolerância/genética , Triticum/fisiologia , Sequência de Aminoácidos , Arabidopsis/genética , Arabidopsis/fisiologia , Proteínas de Arabidopsis/genética , Proteínas de Arabidopsis/metabolismo , Fatores de Transcrição de Choque Térmico/química , Fatores de Transcrição de Choque Térmico/metabolismo , Filogenia , Proteínas de Plantas/metabolismo , Plantas Geneticamente Modificadas/genética , Plantas Geneticamente Modificadas/fisiologia , Plântula/genética , Plântula/fisiologia , Alinhamento de Sequência , Triticum/genética
12.
J Therm Biol ; 88: 102486, 2020 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-32125976

RESUMO

This study aimed to investigate genetic markers and candidate genes associated with thermotolerance in a layer-type strain Taiwan indigenous chickens exposed to acute heat stress. One hundred and ninety-two 30-week-old roosters were subjected to acute heat stress. Changes in body temperature (BT, ΔT) were calculated by measuring the difference between the initial BT and the highest BT during heat stress and the results were categorized into dead, susceptible, tolerant, and intermediate groups depending on their survival and ΔT values at the end of the experiment. A genome-wide association study on survival and ΔT values was conducted using the Cochran-Armitage trend test and Fisher's exact test. Association analyses identified 80 significant SNPs being annotated to 23 candidate genes, 440 SNPs to 71 candidate genes, 64 SNPs to 25 candidate genes, and 378 SNPs to 78 candidate genes in the dead versus survivor, tolerant versus susceptible, intermediate versus tolerant, and intermediate versus susceptible groups, respectively. The annotated genes were associated with apoptosis, cellular stress responses, DNA repair, and metabolic oxidative stress. In conclusion, the identified SNPs of candidate genes provide insights into the potential mechanisms underlying physiological responses to acute heat stress in chickens.


Assuntos
Galinhas/fisiologia , Transtornos de Estresse por Calor/genética , Doenças das Aves Domésticas/genética , Termotolerância/genética , Animais , Galinhas/genética , Genômica , Transtornos de Estresse por Calor/veterinária , Masculino , Polimorfismo de Nucleotídeo Único , Taiwan
13.
Gene ; 743: 144563, 2020 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-32165290

RESUMO

DnaJ is an important molecular chaperone, with significant roles in growth, development, and stress resistance. Studies on the DnaJ gene family in macro-fungi such as Cordyceps spp. s.l. is scare. In this study, 22, 20, and 24 putative DnaJ genes were identified in Tolypocladium guangdongense, Ophiocordyceps sinensis, and C. militaris, respectively. They were classified into four groups based on the presence of the J, zinc finger, and C-terminal domains. We mainly studied the T. guangdongense DnaJ genes being located in the endoplasmic reticulum, cytoplasm, mitochondrion, and nucleus. Phylogenetic analysis revealed gene duplications during the evolutionary process. Multiple cis-elements and transcription factor binding sites were observed in the promoter, suggesting their involvement in the response to multiple stresses. qRT-PCR analysis showed that 63.63% and 45.45% of T. guangdongense DnaJ genes were differentially expressed under cold and heat stress, respectively, indicating their involvement in the response to temperature stress. Many T. guangdongense DnaJ genes in the primordium and fruiting body exhibited differential expression, in comparison to those in the mycelium, suggesting a regulatory role in its growth and development process. These findings will facilitate further functional analysis, and provide information on the classification and conservative functions of DnaJ proteins in macro-fungi.


Assuntos
Cordyceps/genética , Regulação da Expressão Gênica no Desenvolvimento , Regulação Fúngica da Expressão Gênica , Proteínas de Choque Térmico HSP40/genética , Termotolerância/genética , Temperatura Baixa/efeitos adversos , Cordyceps/crescimento & desenvolvimento , Carpóforos/genética , Carpóforos/crescimento & desenvolvimento , Duplicação Gênica , Genes Fúngicos/genética , Micélio/genética , Micélio/crescimento & desenvolvimento , Filogenia
14.
Nat Commun ; 11(1): 1184, 2020 03 04.
Artigo em Inglês | MEDLINE | ID: mdl-32132537

RESUMO

Vector-borne pathogens are known to alter the phenotypes of their primary hosts and vectors, with implications for disease transmission as well as ecology. Here we show that a plant virus, barley yellow dwarf virus, increases the surface temperature of infected host plants (by an average of 2 °C), while also significantly enhancing the thermal tolerance of its aphid vector Rhopalosiphum padi (by 8 °C). This enhanced thermal tolerance, which was associated with differential upregulation of three heat-shock protein genes, allowed aphids to occupy higher and warmer regions of infected host plants when displaced from cooler regions by competition with a larger aphid species, R. maidis. Infection thereby led to an expansion of the fundamental niche of the vector. These findings show that virus effects on the thermal biology of hosts and vectors can influence their interactions with one another and with other, non-vector organisms.


Assuntos
Afídeos/fisiologia , Hordeum/virologia , Insetos Vetores/fisiologia , Luteovirus/patogenicidade , Termotolerância/genética , Distribuição Animal , Animais , Afídeos/virologia , Comportamento Alimentar/psicologia , Perfilação da Expressão Gênica , Regulação da Expressão Gênica , Proteínas de Choque Térmico/metabolismo , Resposta ao Choque Térmico/genética , Interações entre Hospedeiro e Microrganismos/genética , Temperatura Alta/efeitos adversos , Proteínas de Insetos/metabolismo , Doenças das Plantas/virologia
15.
Genes (Basel) ; 11(1)2020 01 07.
Artigo em Inglês | MEDLINE | ID: mdl-31936116

RESUMO

Heat stress affects the physiology and production performance of Chinese Holstein dairy cows. As such, the selection of heat tolerance in cows and elucidating its underlying mechanisms are vital to the dairy industry. This study aimed to investigate the heat tolerance associated genes and molecular mechanisms in Chinese Holstein dairy cows using a high-throughput sequencing approach and bioinformatics analysis. Heat-induced physiological indicators and milk yield changes were assessed to determine heat tolerance levels in Chinese Holstein dairy cows by Principal Component Analysis method following Membership Function Value Analysis. Results indicated that rectal temperature (RT), respiratory rate (RR), and decline in milk production were significantly lower (p < 0.05) in heat tolerant (HT) cows while plasma levels of heat shock protein (HSP: HSP70, HSP90), and cortisol were significantly higher (p < 0.05) when compared to non-heat tolerant (NHT) Chinese Holstein dairy cows. By applying RNA-Seq analysis, we identified 200 (81 down-regulated and 119 up-regulated) significantly (|log2fold change| ≥ 1.4 and p ≤ 0.05) differentially expressed genes (DEGs) in HT versus NHT Chinese Holstein dairy cows. In addition, 14 of which were involved in protein-protein interaction (PPI) network. Importantly, several hub genes (OAS2, MX2, IFIT5 and TGFB2) were significantly enriched in immune effector process. These findings might be helpful to expedite the understanding for the mechanism of heat tolerance in Chinese Holstein dairy cows.


Assuntos
Bovinos/genética , Genes Reguladores/genética , Termotolerância/genética , Animais , China , Indústria de Laticínios/métodos , Perfilação da Expressão Gênica/métodos , Transtornos de Estresse por Calor/genética , Proteínas de Choque Térmico , Resposta ao Choque Térmico/genética , Sequenciamento de Nucleotídeos em Larga Escala/métodos , Temperatura Alta , Transcriptoma/genética
16.
Trop Anim Health Prod ; 52(4): 1961-1970, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31981054

RESUMO

Heat shock protein (HSP) 90 gene provides protection and adaptation to thermal assault and certain polymorphisms have been associated to heat tolerance in humans and animals. Single nucleotide polymorphisms (SNPs) of HSP 90 gene were used to evaluate the scientific basis of heat tolerance in four zebu breeds of Nigeria. The DNA was extracted from skin tissue of 90 adult bulls representing White Fulani (WF), Sokoto Gudali (SG), Red Bororo (RB), and Ambala (AM). The SNPs were determined in DNAs using PCR, sequencing, and visualization and bio-editing by chromatogram in SeqMan Ngen tool. Subsequently, respective genotypes were constructed and genotypic and allelic frequencies were computed. Also, body parameters related to heat stress (HS) including body temperature (BT), rectal temperature (RT), and respiratory rates (RR) were taken for each animal before biological sampling and heat tolerance coefficient (HTC) was calculated. We detected four SNPs distinct/specific for each breed as follows: change from thymine (T) to guanine (G) at position 116 (T116G) in RB, G to cytosine (C) at 220 (G220C) in SG, G to adenine (A) at two positions, 346 (G346A) and 390 (G390A) in AM and WF, respectively. Heterozygous SNPs showed significantly lower values (P < 0.0001) for BT, RT, RR, and HTC than homozygous genotypes at all positions. We hypothesize that animals with heterozygous SNPs in exon 3 of HSP 90 may be tolerant to HS. These SNPs can be used as bio-markers for screening large populations of cattle for tolerance to hot tropical conditions in Nigeria and other sub-humid places.


Assuntos
Bovinos/fisiologia , Proteínas de Choque Térmico HSP90/genética , Polimorfismo de Nucleotídeo Único , Termotolerância/genética , Animais , Bovinos/genética , Nigéria
17.
Microbiology (Reading) ; 166(3): 306-317, 2020 03.
Artigo em Inglês | MEDLINE | ID: mdl-31935187

RESUMO

The MarR-like transcriptional regulator and two ABC transporters encoded by the rcrRPQ operon in the dental caries pathogen Streptococcus mutans have important regulatory roles related to oxidative stress tolerance, genetic competence and (p)ppGpp metabolism. A unique feature of the rcrRPQ operon, when compared to other bacteria, is the presence of two peptides, designated Pep1 and Pep2, encoded in alternative reading frames at the 3' end of rcrQ. Here, we show that the rcrRPQ operon, including Pep1 and 2, is essential for S. mutans to survive and maintain viability at elevated temperatures. No major changes in the levels of the heat shock proteins DnaK or GroEL that could account for the thermosensitivity of rcrRPQ mutants were observed. By introducing a single amino acid substitution into the comX gene that deletes an internally encoded peptide, XrpA, we found that XrpA is a contributing factor to the thermosensitive phenotype of a ΔrcrR strain. Overexpression of XrpA on a plasmid also caused a significant growth defect at 42 °C. Interestingly, loss of the gene for the RelA/SpoT homologue (RSH) enzyme, relA, restored growth of the ΔrcrR strain at 42 °C. During heat stress and when a stringent response was induced, levels of (p)ppGpp were elevated in the ΔrcrR strain. Deletion of relA in the ΔrcrR strain lowered the basal levels of (p)ppGpp to those observed in wild-type S. mutans. Thus, (p)ppGpp pools are dysregulated in ΔrcrR, which likely leads to aberrant control of transcriptional/translational processes and the thermosensitive phenotype. In summary, the genes and peptides encoded in the rcrRPQ operon are critical for thermotolerance, and in some strains these phenotypes are related to altered (p)ppGpp metabolism and increased production of the XrpA peptide.


Assuntos
Transportadores de Cassetes de Ligação de ATP/genética , Streptococcus mutans , Termotolerância/genética , Fatores de Transcrição/genética , Proteínas de Bactérias/genética , Proteínas de Bactérias/metabolismo , Biofilmes/crescimento & desenvolvimento , Cárie Dentária/microbiologia , Regulação Bacteriana da Expressão Gênica , Guanosina Pentafosfato/metabolismo , Guanosina Tetrafosfato/metabolismo , Óperon/genética , Peptídeos/genética , Peptídeos/metabolismo , Streptococcus mutans/genética , Streptococcus mutans/crescimento & desenvolvimento , Streptococcus mutans/metabolismo
18.
Anim Genet ; 51(2): 292-299, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-31887783

RESUMO

Dehong humped cattle (DHH) is an indigenous zebu breed from southwestern China that possesses characteristics of heat tolerance and strong disease resistance and adapts well to the local tropical and subtropical climatic conditions. However, information on selection signatures of DHH is scarce. Herein, we compared the genomes of DHH and each of Diqing and Zhaotong cattle breeds using the population differentiation index (FST ), cross-population extended haplotype homozygosity (XP-EHH) and cross-population composite likelihood ratio (XP-CLR) methods to explore the genomic signatures of heat tolerance and disease resistance in DHH. Several pathways and genes carried selection signatures, including thermal sweating (calcium signaling pathway), heat shock (HSF1) and oxidative stress response (PLCB1, PLCB4), coat color (RAB31), feed intake (ATP8A1, SHC3) and reproduction (TP63, MAP3K13, PTPN4, PPP3CC, ADAMTSL1, SS18L1, OSBPL2, TOX, RREB1, GRK2). These identified pathways and genes may contribute to heat tolerance in DHH. Simultaneously, we also identified LIPH, TP63 and CBFA2T3 genes under positive selection that were associated with immunity.


Assuntos
Bovinos/fisiologia , Resistência à Doença/genética , Estudo de Associação Genômica Ampla/veterinária , Polimorfismo de Nucleotídeo Único , Seleção Genética , Termotolerância/genética , Animais , Cruzamento , Bovinos/genética , China
19.
Planta ; 251(1): 26, 2019 Dec 03.
Artigo em Inglês | MEDLINE | ID: mdl-31797121

RESUMO

MAIN CONCLUSION: Silencing of CI-sHsps by RNAi negatively affected the seed germination process and heat stress response of rice seedlings. Seed size of RNAiCI-sHsp was reduced as compared to wild-type plants. Small heat shock proteins (sHsps) are the ATP-independent chaperones ubiquitously expressed in response to diverse environmental and developmental cues. Cytosolic sHsps constitute the major repertoire of sHsp family. Rice cytosolic class I (CI)-sHsps consists of seven members (Hsp16.9A, Hsp16.9B, Hsp16.9C, Hsp17.4, Hsp17.7, Hsp17.9A and Hsp18). Purified OsHsp17.4 and OsHsp17.9A proteins exhibited chaperone activity by preventing formation of large aggregates with model substrate citrate synthase. OsHsp16.9A and OsHsp17.4 showed nucleo-cytoplasmic localization, while the localization of OsHsp17.9A was preferentially in the nucleus. Transgenic tobacco plants expressing OsHsp17.4 and OsHsp17.9A proteins and Arabidopsis plants ectopically expressing OsHsp17.4 protein showed improved thermotolerance to the respective trans-hosts during the post-stress recovery process. Single hairpin construct was designed to generate all CI-sHsp silenced (RNAiCI-sHsp) rice lines. The major vegetative and reproductive attributes of the RNAiCI-sHsp plants were comparable to the wild-type rice plants. Basal and acquired thermotolerance response of RNAiCI-sHsp seedlings of rice was mildly affected. The seed length of RNAiCI-sHsp rice plants was significantly reduced. The seed germination process was delayed and seed thermotolerance of RNAiCI-sHsp was negatively affected than the non-transgenic seeds. We, thus, implicate that sHsp genes are critical in seedling thermotolerance and seed physiology.


Assuntos
Inativação Gênica , Proteínas de Choque Térmico Pequenas/metabolismo , Oryza/genética , Oryza/fisiologia , Proteínas de Plantas/metabolismo , Plântula/fisiologia , Sementes/fisiologia , Termotolerância/fisiologia , Arabidopsis/genética , Arabidopsis/fisiologia , Citrato (si)-Sintase/metabolismo , Regulação da Expressão Gênica de Plantas , Germinação/genética , Proteínas de Choque Térmico Pequenas/genética , Fenótipo , Proteínas de Plantas/genética , Plantas Geneticamente Modificadas , Ligação Proteica , Multimerização Proteica , Protoplastos/metabolismo , RNA Mensageiro/genética , RNA Mensageiro/metabolismo , Sementes/genética , Termotolerância/genética , Tabaco/genética , Transcriptoma/genética
20.
Biomolecules ; 10(1)2019 12 23.
Artigo em Inglês | MEDLINE | ID: mdl-31877996

RESUMO

Deinococcus radiodurans is an extremely resistant bacteria that has evolved masterful strategies to enable survival under various environmental stress conditions. Heat stress is a major environmental stress factor that can cause denaturation of proteins, membrane disruption, and oxidative stress. Previous studies have examined the mechanisms of the heat stress response by analyzing changes in protein levels; however, little is known about the role of small noncoding RNAs (ncRNAs), which are known to play important regulatory functions in bacteria during various environmental stress response. The ncRNA dsr11 of D. radiodurans was previously identified by RNA-seq and Northern blot. In this study, we showed that the transcription level of dsr11 was up-regulated 4.2-fold under heat stress by qRT-PCR analysis. Heat tolerance assay showed that deleting dsr11 significantly inhibited the viability under high temperature conditions. To assess the influence of dsr11 on the D. radiodurans transcriptome, 157 genes were found differentially expressed in the knock-out mutant by RNA-seq experiment. Combining RNA-seq and in silico analysis, we found that trmE (tRNA modification GTPase) and dr_0651 (arginase) were likely to be the direct targets of dsr11. Further microscale thermophoresis results demonstrated that dsr11 can directly bind to the mRNA of trmE and dr_0651. Our results indicated that dsr11 can enhance the tolerance to heat stress of D. radiodurans by binding to trmE and dr_0651 mRNA. Overall, these results extend our understanding of ncRNA regulation and provide new insights into the heat stress response in D. radiodurans.


Assuntos
Deinococcus/genética , Deinococcus/fisiologia , RNA Bacteriano/genética , Pequeno RNA não Traduzido/genética , Termotolerância/genética , Sequência de Bases , Modelos Moleculares , Conformação de Ácido Nucleico , RNA Bacteriano/química , Pequeno RNA não Traduzido/química
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