目的:阐明HB s、HBx基因与HBVM的相关性及临床意义。方法:以HCC s、LC ir、SeCH、CHB以及A SC s作为研究对象,应用EL ISA法检测研究对象血清中HB sA g、HB sA b、HB eA g、HB eA b、HB cA b;应用PCR技术、探针杂交法及免疫化学自显影法...目的:阐明HB s、HBx基因与HBVM的相关性及临床意义。方法:以HCC s、LC ir、SeCH、CHB以及A SC s作为研究对象,应用EL ISA法检测研究对象血清中HB sA g、HB sA b、HB eA g、HB eA b、HB cA b;应用PCR技术、探针杂交法及免疫化学自显影法定性检测HB s、HBx基因。结果:在研究对象中,HB sA g+HB eA b+HB cA b、HB sA g+HB eA g+HB cA b和HB sA g+HB cA b模式阳性率分别为:53.3%、27.0%和11.8%;除A SC s组外,各临床类型肝病HB sA g+HB eA b+HB cA b模式阳性率均高于HB sA g+HB eA g+HB cA b模式的阳性率,但差别无统计学意义(P>0.05);与A SC s组比较,HCC s组的HBx基因阳性率明显高于A SC s组(P<0.05),其余各组均无明显差别(P>0.05)。与A SC s组比较,LC ir和SeCH组病人中的HB s基因阳性率显著高于A SC s组(P<0.025),其余各组无明显差异(P>0.05);以HB sA g模式作为对照时,各HBVM模式的HB s、HBx基因阳性率与HB sA g模式的阳性率无明显差别(P>0.05);但在HB sA g+HB eA g+HB cA b模式中阳性率显著高于HB sA g+HB eA b+HB cA b模式的阳性率(P<0.001);HB sA g+HB cA b模式中的HBx基因阳性率也显著高于HB sA g+HB eA b+HB cA b模式的阳性率(P<0.001)。结论:HB sA g+HB eA b+HB cA b模式与肝病的发病关系似乎比HB sA g+HB eA g+HB cA b模式更为密切;HBx基因与HCC s的发生存在密切关系,而HB s基因与LC ir、SeCH的发生关系密切。HB s、HBx基因与HB sA g+HB eA g+HB cA b模式关系密切,而HBx基因还与HB sA g+HB cA b模式存在密切关系。展开更多
Alfalfa(Medicago sativa L.) is a legume forage that is widely cultivated owing to its high biomass yield and favorable nutrient values. However, alfalfa contains relatively high lignin, which limits its utilization.Do...Alfalfa(Medicago sativa L.) is a legume forage that is widely cultivated owing to its high biomass yield and favorable nutrient values. However, alfalfa contains relatively high lignin, which limits its utilization.Downregulation of two transcriptional factors, Transparent Testa8(TT8) and Homeobox12(HB12), has been proposed to reduce lignin content in alfalfa. Therefore, silencing of TT8(TT8i) and HB12(HB12i) in alfalfa was achieved by RNAi technology. The objective of this project was to determine effect of gene modification through silencing of TT8 and HB12 genes in alfalfa plants on lignin and phenolic content,bioenergic value, nutrient supply from rumen degradable and undegradable fractions, and in vitro ammonia production in response to the silencing of TT8 and HB12 genes in alfalfa. All gene silenced alfalfa plants(5 TT8i and 11 HB12i) were grown under greenhouse conditions with wild type as a control.Samples were analyzed for bioactive compounds, degradation fractions, truly digestible nutrients, energetic values and in vitro ammonia productions in ruminant systems. Furthermore, relationships between physiochemical, metabolic and fermentation characteristics and molecular spectral parameters were determined using vibrational molecular spectroscopy. Results showed that the HB12i had higher lignin, while TT8i had higher phenolics. Both silenced genotypes had higher rumen slowly degraded carbohydrate fractions and truly digestible neutral detergent fiber, but lower rumen degradable protein fractions. Moreover, the HB12i had lower truly digestible crude protein, energetic values and ammonia production compared with other silenced genotypes. In addition, in relation to the nutritive values of alfalfa, structural carbohydrate parameters were negatively correlated, whereas alpha/beta ratio in protein structure was positively correlated. Furthermore, good predictions were obtained for degradation of protein and carbohydrate fractions and energy values from molecular spectral parameters. In conclusion, silencing of the TT8 and HB12 genes decreased protein availability and increased fiber availability. Silencing of the HB12 gene also increased lignin and decreased energy and rumen ammonia production. Moreover, nutritional alterations were closely correlated with molecular spectral parameters. Therefore, gene modification through silencing the TT8 and HB12 genes in alfalfa influenced physiochemical, metabolic and fermentation characteristics.展开更多
文摘目的:阐明HB s、HBx基因与HBVM的相关性及临床意义。方法:以HCC s、LC ir、SeCH、CHB以及A SC s作为研究对象,应用EL ISA法检测研究对象血清中HB sA g、HB sA b、HB eA g、HB eA b、HB cA b;应用PCR技术、探针杂交法及免疫化学自显影法定性检测HB s、HBx基因。结果:在研究对象中,HB sA g+HB eA b+HB cA b、HB sA g+HB eA g+HB cA b和HB sA g+HB cA b模式阳性率分别为:53.3%、27.0%和11.8%;除A SC s组外,各临床类型肝病HB sA g+HB eA b+HB cA b模式阳性率均高于HB sA g+HB eA g+HB cA b模式的阳性率,但差别无统计学意义(P>0.05);与A SC s组比较,HCC s组的HBx基因阳性率明显高于A SC s组(P<0.05),其余各组均无明显差别(P>0.05)。与A SC s组比较,LC ir和SeCH组病人中的HB s基因阳性率显著高于A SC s组(P<0.025),其余各组无明显差异(P>0.05);以HB sA g模式作为对照时,各HBVM模式的HB s、HBx基因阳性率与HB sA g模式的阳性率无明显差别(P>0.05);但在HB sA g+HB eA g+HB cA b模式中阳性率显著高于HB sA g+HB eA b+HB cA b模式的阳性率(P<0.001);HB sA g+HB cA b模式中的HBx基因阳性率也显著高于HB sA g+HB eA b+HB cA b模式的阳性率(P<0.001)。结论:HB sA g+HB eA b+HB cA b模式与肝病的发病关系似乎比HB sA g+HB eA g+HB cA b模式更为密切;HBx基因与HCC s的发生存在密切关系,而HB s基因与LC ir、SeCH的发生关系密切。HB s、HBx基因与HB sA g+HB eA g+HB cA b模式关系密切,而HBx基因还与HB sA g+HB cA b模式存在密切关系。
文摘Alfalfa(Medicago sativa L.) is a legume forage that is widely cultivated owing to its high biomass yield and favorable nutrient values. However, alfalfa contains relatively high lignin, which limits its utilization.Downregulation of two transcriptional factors, Transparent Testa8(TT8) and Homeobox12(HB12), has been proposed to reduce lignin content in alfalfa. Therefore, silencing of TT8(TT8i) and HB12(HB12i) in alfalfa was achieved by RNAi technology. The objective of this project was to determine effect of gene modification through silencing of TT8 and HB12 genes in alfalfa plants on lignin and phenolic content,bioenergic value, nutrient supply from rumen degradable and undegradable fractions, and in vitro ammonia production in response to the silencing of TT8 and HB12 genes in alfalfa. All gene silenced alfalfa plants(5 TT8i and 11 HB12i) were grown under greenhouse conditions with wild type as a control.Samples were analyzed for bioactive compounds, degradation fractions, truly digestible nutrients, energetic values and in vitro ammonia productions in ruminant systems. Furthermore, relationships between physiochemical, metabolic and fermentation characteristics and molecular spectral parameters were determined using vibrational molecular spectroscopy. Results showed that the HB12i had higher lignin, while TT8i had higher phenolics. Both silenced genotypes had higher rumen slowly degraded carbohydrate fractions and truly digestible neutral detergent fiber, but lower rumen degradable protein fractions. Moreover, the HB12i had lower truly digestible crude protein, energetic values and ammonia production compared with other silenced genotypes. In addition, in relation to the nutritive values of alfalfa, structural carbohydrate parameters were negatively correlated, whereas alpha/beta ratio in protein structure was positively correlated. Furthermore, good predictions were obtained for degradation of protein and carbohydrate fractions and energy values from molecular spectral parameters. In conclusion, silencing of the TT8 and HB12 genes decreased protein availability and increased fiber availability. Silencing of the HB12 gene also increased lignin and decreased energy and rumen ammonia production. Moreover, nutritional alterations were closely correlated with molecular spectral parameters. Therefore, gene modification through silencing the TT8 and HB12 genes in alfalfa influenced physiochemical, metabolic and fermentation characteristics.
