Background Clock circadian regulator(CLOCK)is a core factor of the mammalian biological clock system in regulat-ing female fertility and ovarian physiology.However,CLOCK’s specific function and molecular mechanism in...Background Clock circadian regulator(CLOCK)is a core factor of the mammalian biological clock system in regulat-ing female fertility and ovarian physiology.However,CLOCK’s specific function and molecular mechanism in porcine granulosa cells(GCs)remain unclear.In this study,we focused on CLOCK’s effects on GC proliferation.Results CLOCK significantly inhibited cell proliferation in porcine GCs.CLOCK decreased the expression of cell cycle-related genes,including CCNB1,CCNE1,and CDK4 at the mRNA and protein levels.CDKN1A levels were upregulated by CLOCK.ASB9 is a newly-identified target of CLOCK that inhibits GC proliferation;CLOCK binds to the E-box element in the ASB9 promoter.Conclusions These findings suggest that CLOCK inhibits the proliferation of porcine ovarian GCs by increasing ASB9 level.展开更多
本研究旨在克隆猪锚蛋白重复序列和细胞信号抑制因子盒蛋白2(ankyrin repeat and suppressor of cytokine signalling box containing protein 2,ASB2)基因完整CDS区序列,通过生物信息学方法分析CDS序列和蛋白质基本特性,探讨其在晋汾...本研究旨在克隆猪锚蛋白重复序列和细胞信号抑制因子盒蛋白2(ankyrin repeat and suppressor of cytokine signalling box containing protein 2,ASB2)基因完整CDS区序列,通过生物信息学方法分析CDS序列和蛋白质基本特性,探讨其在晋汾白猪不同组织及卫星细胞诱导成肌过程中的表达规律。选取1日龄晋汾白猪为研究对象,依据GenBank中猪ASB2基因预测核苷酸序列设计引物,以背最长肌组织cDNA为模板,采用分段扩增法进行猪ASB2基因的克隆。利用生物信息学软件分析ASB2氨基酸序列及编码蛋白质的结构和功能,利用实时荧光定量PCR技术检测ASB2基因在猪不同组织及卫星细胞诱导成肌过程中的表达水平。结果显示,猪ASB2基因完整CDS区序列长1824 bp,共编码607个氨基酸。猪ASB2基因核苷酸序列与山羊和牛的相似性最高。生物信息学分析发现,ASB2蛋白为亲水性蛋白,共有54个磷酸化位点,11个O-糖基化位点,1个N-糖基化位点,没有信号肽。保守结构域分析结果表明存在11个ANK基序和1个SOCS基序。猪ASB2蛋白二级结构中无规则卷曲、α-螺旋、β-转角和延伸链分别占43.99%、40.36%、10.05%和5.60%。实时荧光定量PCR结果显示,ASB2基因在猪腰大肌组织中表达量最高,其次为背最长肌和心脏,且与其他组织中表达量具有极显著差异(P<0.01);在诱导卫星细胞成肌过程中发现该基因表达量呈先升高后降低趋势,提示其可能参与调控肌肉生长过程。本研究结果可为进一步探讨猪ASB2基因功能及作用机制提供参考依据。展开更多
基金supported by National Natural Science Foundation of China (32272849)China Agriculture Research System of MOF and MARA
文摘Background Clock circadian regulator(CLOCK)is a core factor of the mammalian biological clock system in regulat-ing female fertility and ovarian physiology.However,CLOCK’s specific function and molecular mechanism in porcine granulosa cells(GCs)remain unclear.In this study,we focused on CLOCK’s effects on GC proliferation.Results CLOCK significantly inhibited cell proliferation in porcine GCs.CLOCK decreased the expression of cell cycle-related genes,including CCNB1,CCNE1,and CDK4 at the mRNA and protein levels.CDKN1A levels were upregulated by CLOCK.ASB9 is a newly-identified target of CLOCK that inhibits GC proliferation;CLOCK binds to the E-box element in the ASB9 promoter.Conclusions These findings suggest that CLOCK inhibits the proliferation of porcine ovarian GCs by increasing ASB9 level.
文摘本研究旨在克隆猪锚蛋白重复序列和细胞信号抑制因子盒蛋白2(ankyrin repeat and suppressor of cytokine signalling box containing protein 2,ASB2)基因完整CDS区序列,通过生物信息学方法分析CDS序列和蛋白质基本特性,探讨其在晋汾白猪不同组织及卫星细胞诱导成肌过程中的表达规律。选取1日龄晋汾白猪为研究对象,依据GenBank中猪ASB2基因预测核苷酸序列设计引物,以背最长肌组织cDNA为模板,采用分段扩增法进行猪ASB2基因的克隆。利用生物信息学软件分析ASB2氨基酸序列及编码蛋白质的结构和功能,利用实时荧光定量PCR技术检测ASB2基因在猪不同组织及卫星细胞诱导成肌过程中的表达水平。结果显示,猪ASB2基因完整CDS区序列长1824 bp,共编码607个氨基酸。猪ASB2基因核苷酸序列与山羊和牛的相似性最高。生物信息学分析发现,ASB2蛋白为亲水性蛋白,共有54个磷酸化位点,11个O-糖基化位点,1个N-糖基化位点,没有信号肽。保守结构域分析结果表明存在11个ANK基序和1个SOCS基序。猪ASB2蛋白二级结构中无规则卷曲、α-螺旋、β-转角和延伸链分别占43.99%、40.36%、10.05%和5.60%。实时荧光定量PCR结果显示,ASB2基因在猪腰大肌组织中表达量最高,其次为背最长肌和心脏,且与其他组织中表达量具有极显著差异(P<0.01);在诱导卫星细胞成肌过程中发现该基因表达量呈先升高后降低趋势,提示其可能参与调控肌肉生长过程。本研究结果可为进一步探讨猪ASB2基因功能及作用机制提供参考依据。
