目的探讨INSIG1基因的单核苷酸多态性(SNP)与成年人肥胖的相关性。方法本研究为病例对照研究,包括516名肥胖受试者(病例组)和463名年龄和性别匹配的正常体重对照者(对照组)。使用TaqManSNP基因分型分析对rs2721进行基因分型。结果rs272...目的探讨INSIG1基因的单核苷酸多态性(SNP)与成年人肥胖的相关性。方法本研究为病例对照研究,包括516名肥胖受试者(病例组)和463名年龄和性别匹配的正常体重对照者(对照组)。使用TaqManSNP基因分型分析对rs2721进行基因分型。结果rs2721基因型分布,显性模型(GT/TT vs GG),隐性模型(TT vs GT/TT)在病例组和对照组之间的差异有统计学意义(分别为P=0.008,P=0.005和P=0.035)。校正混杂因素后,rs2721 GT基因型的显性模型(GT/TT vs GG)仍与肥胖明显相关(OR=1.393,95%CI=1.047~1.853,P=0.023)。rs2721 GT/TT基因型的TG水平明显高于GG基因型(P<0.05)。结论新疆成年人INSIG1基因rs2721位点与肥胖相关。rs2721的GT/TT基因型或T等位基因明显增加肥胖风险。展开更多
Background:Starch is an important substance that supplies energy to ruminants.To provide sufficient energy for high-yielding dairy ruminants,they are typically fed starch-enriched diets.However,starch-enriched diets h...Background:Starch is an important substance that supplies energy to ruminants.To provide sufficient energy for high-yielding dairy ruminants,they are typically fed starch-enriched diets.However,starch-enriched diets have been proven to increase the risk of milk fat depression(MFD)in dairy cows.The starch present in ruminant diets could be divided into rumen-degradable starch(RDS)and rumen escaped starch(RES)according to their different degradation sites(rumen or intestine).Goats and cows have different sensitivities to MFD.Data regarding the potential roles of RDS in milk fat synthesis in the mammary tissue of dairy goats and in regulating the occurrence of MFD are limited.Results:Eighteen Guanzhong dairy goats(day in milk=185±12 d)with similar parity,weight,and milk yield were selected and randomly assigned to one of three groups(n=6),which were fed an LRDS diet(Low RDS=20.52%),MRDS diet(Medium RDS=22.15%),or HRDS diet(High RDS=24.88%)for 5 weeks.Compared with that of the LRDS group,the milk fat contents in the MRDS and HRDS groups significantly decreased.The yields of short-,mediumand long-chain fatty acids decreased in the HRDS group.Furthermore,increased RDS significantly decreased ruminal B.fibrisolvens and Pseudobutyrivibrio abundances and increased the trans-10,cis-12 conjugated linoleic acid(CLA)and trans-10 C18:1 contents in the rumen fluid.A multiomics study revealed that the HRDS diet affected mammary lipid metabolism down-regulation of ACSS2,MVD,AGPS,SCD5,FADS2,CERCAM,SC5D,HSD17B7,HSD17B12,ATM,TP53RK,GDF1 and LOC102177400.Remarkably,the significant decrease of INSIG1,whose expression was depressed by trans-10,cis-12 CLA,could reduce the activity of SREBP and,consequently,downregulate the downstream gene expression of SREBF1.Conclusions:HRDS-induced goat MFD resulted from the downregulation of genes involved in lipogenesis,particularly,INSIG1.Specifically,even though the total starch content and the concentrate-to-fiber ratio were the same as those of the high-RDS diet,the low and medium RDS diets did not cause MFD in lactating goats.展开更多
文摘目的探讨INSIG1基因的单核苷酸多态性(SNP)与成年人肥胖的相关性。方法本研究为病例对照研究,包括516名肥胖受试者(病例组)和463名年龄和性别匹配的正常体重对照者(对照组)。使用TaqManSNP基因分型分析对rs2721进行基因分型。结果rs2721基因型分布,显性模型(GT/TT vs GG),隐性模型(TT vs GT/TT)在病例组和对照组之间的差异有统计学意义(分别为P=0.008,P=0.005和P=0.035)。校正混杂因素后,rs2721 GT基因型的显性模型(GT/TT vs GG)仍与肥胖明显相关(OR=1.393,95%CI=1.047~1.853,P=0.023)。rs2721 GT/TT基因型的TG水平明显高于GG基因型(P<0.05)。结论新疆成年人INSIG1基因rs2721位点与肥胖相关。rs2721的GT/TT基因型或T等位基因明显增加肥胖风险。
基金This research was financially supported by the National Key Research and Development Program of China(award number:2017YFD0500500)the Science&Technological Project of Shaanxi Province,China(award number:2017 TSCXL-NY-04-01).
文摘Background:Starch is an important substance that supplies energy to ruminants.To provide sufficient energy for high-yielding dairy ruminants,they are typically fed starch-enriched diets.However,starch-enriched diets have been proven to increase the risk of milk fat depression(MFD)in dairy cows.The starch present in ruminant diets could be divided into rumen-degradable starch(RDS)and rumen escaped starch(RES)according to their different degradation sites(rumen or intestine).Goats and cows have different sensitivities to MFD.Data regarding the potential roles of RDS in milk fat synthesis in the mammary tissue of dairy goats and in regulating the occurrence of MFD are limited.Results:Eighteen Guanzhong dairy goats(day in milk=185±12 d)with similar parity,weight,and milk yield were selected and randomly assigned to one of three groups(n=6),which were fed an LRDS diet(Low RDS=20.52%),MRDS diet(Medium RDS=22.15%),or HRDS diet(High RDS=24.88%)for 5 weeks.Compared with that of the LRDS group,the milk fat contents in the MRDS and HRDS groups significantly decreased.The yields of short-,mediumand long-chain fatty acids decreased in the HRDS group.Furthermore,increased RDS significantly decreased ruminal B.fibrisolvens and Pseudobutyrivibrio abundances and increased the trans-10,cis-12 conjugated linoleic acid(CLA)and trans-10 C18:1 contents in the rumen fluid.A multiomics study revealed that the HRDS diet affected mammary lipid metabolism down-regulation of ACSS2,MVD,AGPS,SCD5,FADS2,CERCAM,SC5D,HSD17B7,HSD17B12,ATM,TP53RK,GDF1 and LOC102177400.Remarkably,the significant decrease of INSIG1,whose expression was depressed by trans-10,cis-12 CLA,could reduce the activity of SREBP and,consequently,downregulate the downstream gene expression of SREBF1.Conclusions:HRDS-induced goat MFD resulted from the downregulation of genes involved in lipogenesis,particularly,INSIG1.Specifically,even though the total starch content and the concentrate-to-fiber ratio were the same as those of the high-RDS diet,the low and medium RDS diets did not cause MFD in lactating goats.
