Polish wheat (Triticum polonicum) is a unique tetraploid wheat species characterized by an elongated outer glume. The genetic control of the long-glume trait by a single semi-dominant locus, P1 (from Polish wheat), wa...Polish wheat (Triticum polonicum) is a unique tetraploid wheat species characterized by an elongated outer glume. The genetic control of the long-glume trait by a single semi-dominant locus, P1 (from Polish wheat), was established more than 100 years ago, but the underlying causal gene and molecular nature remain elusive. Here, we report the isolation of VRT-A2, encoding an SVP-clade MADS-box transcription factor, as the P1 candidate gene. Genetic evidence suggests that in T. polonicum, a naturally occurring sequence rearrangement in the intron-1 region of VRT-A2 leads to ectopic expression of VRT-A2 in floral organs where the long-glume phenotype appears. Interestingly, we found that the intron-1 region is a key ON/OFF molecular switch for VRT-A2 expression, not only because it recruits transcriptional repressors, but also because it confers intron-mediated transcriptional enhancement. Genotypic analyses using wheat accessions indicated that the P1 locus is likely derived from a single natural mutation in tetraploid wheat, which was subsequently inherited by hexaploid T. petropavlovskyi. Taken together, our findings highlight the promoter-proximal intron variation as a molecular basis for phenotypic differentiation, and thus species formation in Triticum plants.展开更多
Exploitation of new gene resources and genetic networks contributing to the control of crop yield-related traits,such as plant height,grain size,and shape,may enable us to breed modern high-yielding wheat varieties th...Exploitation of new gene resources and genetic networks contributing to the control of crop yield-related traits,such as plant height,grain size,and shape,may enable us to breed modern high-yielding wheat varieties through molecular methods.In this study,via ethylmethanesulfonate mutagenesis,we identify a wheat mutant plant,mu-597,that shows semi-dwarf plant architecture and round grain shape.Through bulked segregant RNA-seq and map-based cloning,the causal gene for the semi-dwarf phenotype of mu-597 is located.We find that a single-base mutation in the coding region of TaACTIN7-D(TaACT7-D),leading to a Gly-to-Ser(G65S)amino acid mutation at the 65th residue of the deduced TaACT7-D protein,can explain the semi-dwarfism and round grain shape of mu-597.Further evidence shows that the G65S mutation in TaACT7-D hinders the polymerization of actin from monomeric(G-actin)to filamentous(F-actin)status while attenuates wheat responses to multiple phytohormones,including brassinosteroids,auxin,and gibberellin.Together,these findings not only define a new semi-dwarfing gene resource that can be potentially used to design plant height and grain shape of bread wheat but also establish a direct link between actin structure modulation and phytohormone signal transduction.展开更多
Objective:The purpose of this study was to analyze the economic burden of inpatients with hepatitis B virus(HBV)-related diseases and the influencing factors so as to provide an effective basis for the development of ...Objective:The purpose of this study was to analyze the economic burden of inpatients with hepatitis B virus(HBV)-related diseases and the influencing factors so as to provide an effective basis for the development of health prevention and control strategies.Methods:The patients were selected by means of successive sampling in the period between August and December 2012 from those who were diagnosed with HBV-related diseases and hospitalized in countylevel medical institutions of Jiangsu Province.One hundred ninety-six patients were studied,including 3 patients with acute HBV,141 with chronic HBV,18 with compensatory cirrhosis,22 with decompensated cirrhosis,and 12 with liver cancer.This study adopted a questionnaire method to investigate and calculate the direct and indirect economic burden of the subjects according to disease economic burden theories and methods.Multiple linear stepwise regression was used for analysis of the influencing factors for economic burden of inpatients with HBV-related diseases.Results:The average economic burden for the 196 inpatients investigated was RMB 28,971.The direct economic burden was RMB 19,916(68.7%),including direct medical costs(RMB 19,087;95.8%)and direct non-medical costs(RMB 829;4.2%).The indirect economic burden was RMB 9055(31.3%),including patient-related expenses(RMB 6348;70.1%)and nursing expenses(RMB 2707;29.9%).According to the multiple linear stepwise regression analysis results,the hospital stay,proportion of medicine,age,and disease type affected the economic burden of the patients(P<0.05).Conclusion:Patients with HBV-related diseases undertake a heavy economic burden for hospitalization,especially the direct economic burden.Therefore,the inpatients’economic burden can be reduced by shortening the hospital stay,reducing the medical expenses reasonably,and delaying the progression of disease as far as possible according to medical standards.展开更多
基金This work was supported by grants from the National Natural Science Foundation of China(32072055,31991210,and 91935304).
文摘Polish wheat (Triticum polonicum) is a unique tetraploid wheat species characterized by an elongated outer glume. The genetic control of the long-glume trait by a single semi-dominant locus, P1 (from Polish wheat), was established more than 100 years ago, but the underlying causal gene and molecular nature remain elusive. Here, we report the isolation of VRT-A2, encoding an SVP-clade MADS-box transcription factor, as the P1 candidate gene. Genetic evidence suggests that in T. polonicum, a naturally occurring sequence rearrangement in the intron-1 region of VRT-A2 leads to ectopic expression of VRT-A2 in floral organs where the long-glume phenotype appears. Interestingly, we found that the intron-1 region is a key ON/OFF molecular switch for VRT-A2 expression, not only because it recruits transcriptional repressors, but also because it confers intron-mediated transcriptional enhancement. Genotypic analyses using wheat accessions indicated that the P1 locus is likely derived from a single natural mutation in tetraploid wheat, which was subsequently inherited by hexaploid T. petropavlovskyi. Taken together, our findings highlight the promoter-proximal intron variation as a molecular basis for phenotypic differentiation, and thus species formation in Triticum plants.
基金supported by the grants from National Key Research and Development Program of China(2022YFF1003401 to Jie Liu)Hainan Yazhou Bay Seed Laboratory(B21HJ0111 to Zhongfu Ni)the National Natural Science Foundation of China(31991210 to Qixin Sun and 32072055 to Jie Liu).
文摘Exploitation of new gene resources and genetic networks contributing to the control of crop yield-related traits,such as plant height,grain size,and shape,may enable us to breed modern high-yielding wheat varieties through molecular methods.In this study,via ethylmethanesulfonate mutagenesis,we identify a wheat mutant plant,mu-597,that shows semi-dwarf plant architecture and round grain shape.Through bulked segregant RNA-seq and map-based cloning,the causal gene for the semi-dwarf phenotype of mu-597 is located.We find that a single-base mutation in the coding region of TaACTIN7-D(TaACT7-D),leading to a Gly-to-Ser(G65S)amino acid mutation at the 65th residue of the deduced TaACT7-D protein,can explain the semi-dwarfism and round grain shape of mu-597.Further evidence shows that the G65S mutation in TaACT7-D hinders the polymerization of actin from monomeric(G-actin)to filamentous(F-actin)status while attenuates wheat responses to multiple phytohormones,including brassinosteroids,auxin,and gibberellin.Together,these findings not only define a new semi-dwarfing gene resource that can be potentially used to design plant height and grain shape of bread wheat but also establish a direct link between actin structure modulation and phytohormone signal transduction.
基金National Science and Technology Major Project-Study on Large-scale Field epidemiology and Interventions for AIDS Prevention,Virus Hepatitis,Tuberculosis and other Major Infectious Diseases[2011ZX10004902]。
文摘Objective:The purpose of this study was to analyze the economic burden of inpatients with hepatitis B virus(HBV)-related diseases and the influencing factors so as to provide an effective basis for the development of health prevention and control strategies.Methods:The patients were selected by means of successive sampling in the period between August and December 2012 from those who were diagnosed with HBV-related diseases and hospitalized in countylevel medical institutions of Jiangsu Province.One hundred ninety-six patients were studied,including 3 patients with acute HBV,141 with chronic HBV,18 with compensatory cirrhosis,22 with decompensated cirrhosis,and 12 with liver cancer.This study adopted a questionnaire method to investigate and calculate the direct and indirect economic burden of the subjects according to disease economic burden theories and methods.Multiple linear stepwise regression was used for analysis of the influencing factors for economic burden of inpatients with HBV-related diseases.Results:The average economic burden for the 196 inpatients investigated was RMB 28,971.The direct economic burden was RMB 19,916(68.7%),including direct medical costs(RMB 19,087;95.8%)and direct non-medical costs(RMB 829;4.2%).The indirect economic burden was RMB 9055(31.3%),including patient-related expenses(RMB 6348;70.1%)and nursing expenses(RMB 2707;29.9%).According to the multiple linear stepwise regression analysis results,the hospital stay,proportion of medicine,age,and disease type affected the economic burden of the patients(P<0.05).Conclusion:Patients with HBV-related diseases undertake a heavy economic burden for hospitalization,especially the direct economic burden.Therefore,the inpatients’economic burden can be reduced by shortening the hospital stay,reducing the medical expenses reasonably,and delaying the progression of disease as far as possible according to medical standards.
