Article(id=1308841176061534662, tenantId=1146029695717560320, journalId=1189982191388893191, issueId=1308840985296204417, articleNumber=null, orderNo=null, doi=10.16438/j.0513-4870.2025-1342, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1762876800000, receivedDateStr=2025-11-12, revisedDate=1769702400000, revisedDateStr=2026-01-30, acceptedDate=null, acceptedDateStr=null, onlineDate=1789981653465, onlineDateStr=2026-09-21, pubDate=1778515200000, pubDateStr=2026-05-12, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1789981653465, onlineIssueDateStr=2026-09-21, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1789981653465, creator=13701087609, updateTime=1789981653465, updator=13701087609, issue=Issue{id=1308840985296204417, tenantId=1146029695717560320, journalId=1189982191388893191, year='2026', volume='61', issue='5', pageStart='1435', pageEnd='1880', issueExtLink='null', onlineDate='null', pubDate='1778515200000', pubDateStr='2026-05-12', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1789981607984, creator='13701087609', updateTime=1789984207975, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1308851890515968861, tenantId=1146029695717560320, journalId=1189982191388893191, issueId=1308840985296204417, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1308851890515968862, tenantId=1146029695717560320, journalId=1189982191388893191, issueId=1308840985296204417, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=1852, endPage=1860, ext={EN=ArticleExt(id=1308841176237695431, articleId=1308841176061534662, tenantId=1146029695717560320, journalId=1189982191388893191, language=EN, title=Mining the transcriptome for key genes related to polyphyllin biosynthesis, columnId=1190335348761793317, journalTitle=Acta Pharmaceutica Sinica, columnName=Original Articles, runingTitle=null, highlight=null, articleAbstract=

To identify the key genes involved in the synthesis of polyphyllin within downstream pathways, this study employed high-performance liquid chromatography (HPLC) to quantify the content of eight types of polyphyllins in two groups of Paris polyphylla var. yunnanensis rhizomes, followed by transcriptome sequencing analysis. The results revealed significant differences in the content of the eight types of polyphyllins between the two groups. Specifically, the total saponin content in the high saponin content group (HS) was 24.81 mg·g-1, whereas that in the low saponin content group (LS) was 5.99 mg·g-1. Notably, polyphyllin Ⅱ, Ⅲ, and Ⅴ were undetectable in the LS group. The substantial difference in total saponin content between the two groups can be primarily attributed to the considerable accumulation of diosgenin-type saponins in the HS group. A total of 11 399 differentially expressed genes were identified through transcriptome sequencing, the comparison between HS and LS, with 5 708 genes exhibiting upregulation and 5 691 genes exhibiting downregulation. This study successfully screened seven candidate genes involved in the synthesis of polyphyllin and conducted protein structure prediction for these genes. Through interaction network analysis, 80 transcription factors with a correlation coefficient of 0.95 or higher with the candidate genes were identified, among which a total of 8 transcription factors were correlated with two or more candidate genes. The findings provide a theoretical foundation for predicting genes related to polyphyllin synthesis, exploring the biosynthetic pathway of polyphyllin, and understanding their accumulation patterns.

, authors=Mi-mi TIAN1, Ping XU1, 2, Xiao-ye ZHANG1, Jun-zhe ZHOU1, Mao-ying CUI3, *, Guo-wei ZHENG1, *, authorsList=Mi-mi TIAN, Ping XU, Xiao-ye ZHANG, Jun-zhe ZHOU, Mao-ying CUI, Guo-wei ZHENG, authorCompany=null, correspAuthors=Mao-ying CUI, Guo-wei ZHENG, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright ©2026 Acta Pharmaceutica Sinica. All rights reserved., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1308841179702190550, articleId=1308841176061534662, tenantId=1146029695717560320, journalId=1189982191388893191, language=CN, title=基于转录组挖掘重楼皂苷合成关键基因, columnId=1190335348896011050, journalTitle=药学学报, columnName=研究论文, runingTitle=null, highlight=null, articleAbstract=

为挖掘重楼皂苷合成下游通路中的关键基因, 本研究采用HPLC测定了2组滇重楼根茎中8种重楼皂苷含量, 进一步进行转录组测序分析。结果显示, 2组滇重楼根茎中8种重楼皂苷的含量存在显著差异, 其中高皂苷含量组(HS)与低皂苷含量组(LS)的总皂苷含量分别为24.81和5.99 mg·g-1。此外, LS组中未检测到重楼皂苷Ⅱ、Ⅲ和Ⅴ。结合皂苷含量分析, 2组滇重楼总皂苷含量差异显著的主要原因是薯蓣皂苷类皂苷在HS组中大量积累。转录组测序共获得了11 399个差异基因, HS组与LS组相比, 有5 708个基因表达上调, 5 691个为基因表达下调。研究成功筛选出7个参与重楼皂苷合成的候选基因, 并对其进行了蛋白结构预测。通过互作网络分析, 筛选出80个与候选基因的相关系数在0.95或以上的转录因子, 其中与2个或2个以上的候选基因有相关性的转录因子共有8个。本研究为预测重楼皂苷合成的相关基因、探索重楼皂苷生物合成途径及其积累规律提供了理论依据。

, authors=田密密1, 徐萍1, 2, 章晓叶1, 周君哲1, 崔茂应3, *, 郑国伟1, *, authorsList=田密密, 徐萍, 章晓叶, 周君哲, 崔茂应, 郑国伟, authorCompany=null, correspAuthors=崔茂应, 郑国伟, authorNote=

#

共同第一作者.

作者贡献:

田密密与徐萍为共同第一作者, 负责文献调研、数据整理及初稿撰写; 章晓叶与周君哲参与部分数据处理与图表制作; 郑国伟与崔茂应为通讯作者, 负责论文框架设计、修改及最终定稿。所有作者均对论文内容进行了审阅并同意最终版本。

, correspAuthorsNote=
崔茂应, E-mail:
郑国伟, E-mail:
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NameRaw readsClean readsClean base/GbError rate/%Q20/%Q30/%GC content/%
HS-197 163 03294 710 20614.210.0397.6793.3251.12
HS-296 736 86094 180 97014.130.0397.5793.0950.70
HS-396 282 13494 001 21614.100.0397.7693.4951.42
LS-198 512 42289 978 72213.500.0397.7593.6150.58
LS-289 204 03881 879 40212.280.0397.7793.5249.88
LS-390 356 54684 722 64212.710.0397.8093.6649.79
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Sequencing data statistics of two groups of Paris polyphylla Smith var. yunnanensis

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NameRaw readsClean readsClean base/GbError rate/%Q20/%Q30/%GC content/%
HS-197 163 03294 710 20614.210.0397.6793.3251.12
HS-296 736 86094 180 97014.130.0397.5793.0950.70
HS-396 282 13494 001 21614.100.0397.7693.4951.42
LS-198 512 42289 978 72213.500.0397.7593.6150.58
LS-289 204 03881 879 40212.280.0397.7793.5249.88
LS-390 356 54684 722 64212.710.0397.8093.6649.79
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基于转录组挖掘重楼皂苷合成关键基因
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田密密 1 , 徐萍 1, 2 , 章晓叶 1 , 周君哲 1 , 崔茂应 3, * , 郑国伟 1, *
药学学报 | 研究论文 2026,61(5): 1852-1860
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药学学报 |研究论文 2026 , 61 (5) : 1852 -1860
基于转录组挖掘重楼皂苷合成关键基因
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田密密1, 徐萍1, 2, 章晓叶1, 周君哲1, 崔茂应3, * , 郑国伟1, *
作者信息
  • 1云南中医药大学中药学院, 云南省南药可持续利用研究重点实验室, 云南 昆明 650500
  • 2西藏大学生态环境学院, 西藏自治区 拉萨 850000
  • 3云南中医药大学信息学院, 云南 昆明 650500
通讯作者:
崔茂应, E-mail:
郑国伟, E-mail:
作者简介:

#

共同第一作者.

作者贡献:

田密密与徐萍为共同第一作者, 负责文献调研、数据整理及初稿撰写; 章晓叶与周君哲参与部分数据处理与图表制作; 郑国伟与崔茂应为通讯作者, 负责论文框架设计、修改及最终定稿。所有作者均对论文内容进行了审阅并同意最终版本。

Mining the transcriptome for key genes related to polyphyllin biosynthesis
Mi-mi TIAN1, Ping XU1, 2, Xiao-ye ZHANG1, Jun-zhe ZHOU1, Mao-ying CUI3, * , Guo-wei ZHENG1, *
Affiliations
  • 1Yunnan Key Laboratory of Southern Medicinal Utilization, College of Traditional Chinese Medicine, Yunnan University of Chinese Medicine, Kunming 650500, China
  • 2School of Ecology and Environment, Xizang University, Lhasa 850000, China
  • 3Institute of Information of Yunnan University of Chinese Medicine, Kunming 650500, China
出版时间: 2026-05-12 doi: 10.16438/j.0513-4870.2025-1342
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为挖掘重楼皂苷合成下游通路中的关键基因, 本研究采用HPLC测定了2组滇重楼根茎中8种重楼皂苷含量, 进一步进行转录组测序分析。结果显示, 2组滇重楼根茎中8种重楼皂苷的含量存在显著差异, 其中高皂苷含量组(HS)与低皂苷含量组(LS)的总皂苷含量分别为24.81和5.99 mg·g-1。此外, LS组中未检测到重楼皂苷Ⅱ、Ⅲ和Ⅴ。结合皂苷含量分析, 2组滇重楼总皂苷含量差异显著的主要原因是薯蓣皂苷类皂苷在HS组中大量积累。转录组测序共获得了11 399个差异基因, HS组与LS组相比, 有5 708个基因表达上调, 5 691个为基因表达下调。研究成功筛选出7个参与重楼皂苷合成的候选基因, 并对其进行了蛋白结构预测。通过互作网络分析, 筛选出80个与候选基因的相关系数在0.95或以上的转录因子, 其中与2个或2个以上的候选基因有相关性的转录因子共有8个。本研究为预测重楼皂苷合成的相关基因、探索重楼皂苷生物合成途径及其积累规律提供了理论依据。

重楼皂苷  /  滇重楼  /  转录组  /  生物合成途径  /  基因

To identify the key genes involved in the synthesis of polyphyllin within downstream pathways, this study employed high-performance liquid chromatography (HPLC) to quantify the content of eight types of polyphyllins in two groups of Paris polyphylla var. yunnanensis rhizomes, followed by transcriptome sequencing analysis. The results revealed significant differences in the content of the eight types of polyphyllins between the two groups. Specifically, the total saponin content in the high saponin content group (HS) was 24.81 mg·g-1, whereas that in the low saponin content group (LS) was 5.99 mg·g-1. Notably, polyphyllin Ⅱ, Ⅲ, and Ⅴ were undetectable in the LS group. The substantial difference in total saponin content between the two groups can be primarily attributed to the considerable accumulation of diosgenin-type saponins in the HS group. A total of 11 399 differentially expressed genes were identified through transcriptome sequencing, the comparison between HS and LS, with 5 708 genes exhibiting upregulation and 5 691 genes exhibiting downregulation. This study successfully screened seven candidate genes involved in the synthesis of polyphyllin and conducted protein structure prediction for these genes. Through interaction network analysis, 80 transcription factors with a correlation coefficient of 0.95 or higher with the candidate genes were identified, among which a total of 8 transcription factors were correlated with two or more candidate genes. The findings provide a theoretical foundation for predicting genes related to polyphyllin synthesis, exploring the biosynthetic pathway of polyphyllin, and understanding their accumulation patterns.

polyphyllin  /  Paris polyphylla var. yunnanensis  /  transcriptome  /  biosynthetic pathway  /  gene
田密密, 徐萍, 章晓叶, 周君哲, 崔茂应, 郑国伟. 基于转录组挖掘重楼皂苷合成关键基因. 药学学报, 2026 , 61 (5) : 1852 -1860 . DOI: 10.16438/j.0513-4870.2025-1342
Mi-mi TIAN, Ping XU, Xiao-ye ZHANG, Jun-zhe ZHOU, Mao-ying CUI, Guo-wei ZHENG. Mining the transcriptome for key genes related to polyphyllin biosynthesis[J]. Acta Pharmaceutica Sinica, 2026 , 61 (5) : 1852 -1860 . DOI: 10.16438/j.0513-4870.2025-1342
滇重楼Paris polyphylla Smith var. yunnanensis (Franch.) Hand.-Mazz.为藜芦科(Melanthiaceae)重楼属(Paris L.)多年生草本植物, 具有清热解毒、消肿止痛、凉肝定惊的功效, 其主要成分为重楼皂苷。现代研究表明, 重楼皂苷Ⅰ对高转移人乳头状浆液性卵巢癌细胞具有明显的体外抑制生长作用[1], 重楼皂苷Ⅱ在抑制肿瘤血管方面有良好的活性[2], 重楼皂苷Ⅲ可抑制结肠癌细胞HCT116的体外增殖并促进HCT116细胞凋亡[3]; 重楼皂苷Ⅰ~Ⅲ、Ⅴ~Ⅶ对红色毛癣菌、絮状表皮癣菌、石膏小孢子菌以及耐氟康唑白色念珠菌均表现出显著抑制活性[4]; 重楼皂苷Ⅵ可以通过调节炎症和氧化应激反应改善纤维化[5], 重楼皂苷Ⅶ、重楼皂苷H以及纤细薯蓣皂苷对乳腺癌细胞MCF-7和MDA MB-231均有一定的细胞毒活性[6]。据统计, 国内滇重楼的使用量每年超过1 000 t, 约有80%的野生滇重楼资源已被利用[7], 导致野生滇重楼已濒临灭绝。重楼根茎现已成为80种专利药物的主要成分[8]。由于野生资源减少及栽培周期较长, 滇重楼在研究和药用领域的使用受到限制。因此, 通过合成生物学与酶催化技术获取重楼皂苷已成为当前研究热点。
重楼皂苷的上游通路已得到充分研究[9, 10], 目前关于重楼皂苷生物合成的研究聚焦于参与糖基化过程的尿苷二磷酸葡萄糖醛酸转移酶(UGT)与细胞色素P450酶(CYP)。PpCYP90G4与PpCYP94D108、PpCYP94D109或PpCYP72A616等酶形成的协同催化体系, 是胆固醇合成重楼皂苷前体薯蓣皂苷元的关键[11, 12]。
在PpUGT73C1[13]或PpUGT91BP1[14]的继续催化下, 薯蓣皂苷元与偏诺皂苷元的C3-OH糖基化, 分别转化为延龄草苷与偏诺皂苷元-3-O-葡萄糖苷, 同时已有研究报道PpUGT80A40[4]、PpUGT80A49[15]也参与薯蓣皂苷元向延龄草苷的转化, PpUGT80A41[4]与PpUGT6[16]则可促进偏诺皂苷元合成偏诺皂苷元-3-O-葡萄糖苷。当前重楼皂苷Ⅱ、Ⅲ、Ⅴ~Ⅶ的生物合成途径已明确, 然而薯蓣皂苷元的C-17如何发生α-羟基化形成偏诺皂苷元, 以及其他重楼皂苷的下游合成机制尚不清楚, 2′-O-鼠李糖基转移酶PpUGT73CE1[4]分别催化延龄草苷与偏诺皂苷元-3-O-葡萄糖苷转化为重楼皂苷Ⅴ与重楼皂苷Ⅵ, 在PpUGT73YD1与PpUGT738A2[17]的调控下, 重楼皂苷Ⅵ的连续两次糖基化形成重楼皂苷Ⅶ, 在相同酶的催化下, 重楼皂苷Ⅴ首先形成重楼皂苷Ⅲ, 继而转化为重楼皂苷Ⅱ, 另外, 促进重楼皂苷Ⅴ合成重楼皂苷Ⅲ的鼠李糖基转移酶有PpUGT73DY2[18]、PpUGT91T1和PpUGT91T2[19]。
合成重楼皂苷的关键基因与重楼皂苷含量的联系密切相关。转录组反映了基因的表达情况, 是连接基因表达与表型的重要纽带。同种植物不同个体细胞中的转录本存在差异, 这为植物的变异与进化提供了重要依据。本研究对采自云南省保山市与昭通市两地的滇重楼样本, 进行了8种重楼皂苷的含量测定与转录组分析。通过整合皂苷含量与转录组数据, 旨在筛选与重楼皂苷生物合成相关的候选基因。该研究对于揭示滇重楼甾体皂苷的生物合成与积累规律具有重要参考价值。
实验材料   重楼样品分别采自保山市腾冲县北海乡(北纬25.29°, 东经98.48°, 海拔1 765.2 m)和昭通市镇雄县木卓镇(北纬27.68°, 东经104.83°, 海拔1 505.1 m), 每组3个生物学重复, 所采集的材料为种子萌发生长7年的滇重楼(图1)。新鲜滇重楼根茎样品经过洗净、除去须根、切片后, 一部分样品放入液氮中迅速冷冻存入-80 ℃超低温冰箱中, 用于转录组测序; 剩余样品置于45 ℃烘箱烘干至恒重, 粉碎后过三号筛(50目筛), 密封置于阴凉干燥处保存, 用于重楼皂苷含量检测。
试剂与仪器   重楼皂苷Ⅰ (AFCC1451, 纯度为98%)、重楼皂苷Ⅱ (AFBG1350, 纯度为98%)、重楼皂苷Ⅲ (AFCA0455, 纯度为98%)、重楼皂苷Ⅴ (AF20050105, 纯度为98%)、重楼皂苷Ⅵ (AFBH2201, 纯度为98%)、重楼皂苷Ⅶ (AF21121305, 纯度为98%)、重楼皂苷H (AFBJ0816, 纯度为98%)、纤细薯蓣皂苷(AFCC0255, 纯度为98%)均购于成都埃法生物科技有限公司; 乙腈(色谱纯, 纯度≥ 99.7%)购于云南罗德宝生物科技有限公司; 纯净水购于昆明娃哈哈启力饮料有限公司。
高效液相色谱仪(Agilent 1200, 美国安捷伦公司)、电子天平(PTY-224/323, 华志电子科技有限公司)、电热恒温水浴锅(HWS-26, 上海一恒科学仪器有限公司)、超声波清洗仪(CQ-400A, 上海跃进医用光学器械厂)。
对照品溶液的制备   分别称取重楼皂苷Ⅰ~Ⅲ、Ⅴ~Ⅶ、H以及纤细薯蓣皂苷对照品适量, 色谱纯甲醇溶解并定容至2.0 mL, 依次制成各标准品溶液(浓度分别为2.0、2.0、3.0、2.1、2.1、1.6、1.0、2.0 mg·mL-1)。
供试品溶液的制备   精密称取各重楼粉末样品0.5 g, 分别加入5.0 mL甲醇, 并记录各样品初始质量, 55 ℃条件下超声提取1 h后, 对各样品进行补重。5 000 r·min-1的条件下离心2 min后, 经0.22 μm微孔滤膜过滤, 即得。
液相色谱条件   参考文献[20]方法测定, 色谱柱为Agilent SB-C18色谱柱(250 mm × 4.6 mm, 5 μm), HPLC的分析系统为Agilent 1200系统, 流动相为水-乙腈(60∶40), 流速为0.7 mL·min-1, 进样量为10 μL, 柱温25 ℃。
转录组文库构建   按照试剂盒说明书步骤分别提取各样品总RNA, 并对提取的RNA进行完整性检测、RNA浓度测定。确保符合后要求后, 将Oligo(dT)磁珠富集含有PloyA的mRNA反转录为cDNA, 对cDNA进行PCR扩增, 以获得足够的cDNA总量。修复cDNA连接SMRT哑铃头建转录组文库, 经核酸外切酶消化得完整文库。
数据处理及分析   使用CD-HIT对转录组数据进行去冗余与数据校正, 利用GO、KOG、与KEGG平台对数据进行注释与差异分析, 并使用iTAK结合hmmscan鉴定转录因子。为探究候选基因与各重楼皂苷的合成以及与转录因子间的关系, 利用迈维云平台(https://cloud.metware.cn)分析各重楼皂苷与对应候选基因的相关性, 使用SWISS-MODEL (https://swissmodel.expasy.org/)对候选基因进行蛋白同源建模, 再将筛选的候选基因与其相关性阈值达到0.95或以上且P < 0.05的转录因子进行交互网络分析。
HPLC检测结果显示, 采自保山市的滇重楼样品中, 8种皂苷的平均总含量为24.81 mg·g-1, 是昭通样品(5.99 mg·g-1)的4.1倍(图2)。据此显著差异, 本研究将保山市的样品定义为高皂苷含量组(high saponin, HS), 而将昭通市的样品定义为低皂苷含量组(low saponin, LS)。其中重楼皂苷Ⅰ、Ⅱ、Ⅶ是中国药典规定的重楼质控成分[21], HS与LS中重楼皂苷Ⅰ、Ⅱ和Ⅶ的总含量分别为20.19、0.62 mg·g-1。HS的重楼皂苷Ⅰ、Ⅱ和Ⅶ总含量比LS高19.57 mg·g-1。HS中的重楼皂苷Ⅰ~Ⅲ和Ⅶ比LS分别高8.05、9.18、0.93、2.34 mg·g-1, 重楼皂苷Ⅴ、Ⅵ、H与纤细薯蓣皂苷在两组样品中的含量无显著差异。另外, LS中不含薯蓣皂苷类重楼皂苷Ⅱ、Ⅲ和Ⅴ。结果表明, 薯蓣皂苷类重楼皂苷在HS中大量累积导致总皂苷含量高于LS。
为进一步分析导致重楼根茎中重楼皂苷差异累积的分子机制以及筛选关键候选基因, 对两组样品进行转录组测序, 每组3个生物学重复, 共6个转录组文库。具体信息如表1所示, 6个重楼样品的原始测序读段(raw reads)数量分布在89 204 038~98 512 422条之间, 高质量测序读段(clean reads)数量分布在81 879 402~94 710 206条之间, 高质量碱基(clean base)在12.28~14.21 Gb之间, 且所有样品的Q30均在93.09%以上, 错误率均不超过0.03%, 说明所有样品得到了高质量的原始测序读段, 数据可靠, 满足分析要求。
PCA分析结果显示, PC1和PC2分别解释了43.11%与16.86%的样品变异, 合计解释度为59.97% (图3A)。HS与LS在PC1与PC2方向上呈明显分离趋势, 表明两组样品存在显著差异。对两个组别的样品进行高层聚类分析(图3B), 发现各基因在两组样品的表达差异明显, 表明两组样品可能存在明显差异。
通过差异基因分析, HS与LS比较, 共有11 399个差异基因(DEGs), 其中5 708个上调, 5 691个下调(图4A)。为了验证这些差异基因的功能, 分别对这些基因进行了GO、KOG、KEGG富集分析。GO富集分析结果显示(图4B), 3 963个单基因在GO数据库得到了注释, 一共涉及43项, 图中列出32项, 生物学过程方面, DEGs主要聚集于“cellular process”, 共7 539个单基因; 细胞组分方面, “cellular anatomical entity”富集的DEGs最多; 分子功能方面, 富集最多基因的项为“binding”, 共6 821个单基因, 0.035%的单基因富集在“biological process involved in intraspecies interaction between organisms”, 仅4个转录本。
KOG富集分析结果显示(图4C), 共有12 007条unigenes得到注释, “仅一般功能预测(R)”项富集了1 723个滇重楼转录本, 数量最多, 其次为“信号转导机制(T)”, 转录本数量为902个, 最少为“细胞运动(N)”, 仅8个转录本。
经KEGG富集分析, 14 921个被注释的高质量转录本被归类为139条通路中(图4D), 涉及代谢、遗传信息处理、有机系统、环境信息处理和细胞过程等5个领域, 其中富集明显的通路有“次生代谢物的生物合成”和“淀粉和蔗糖代谢”。KEGG富集结果显示, 与重楼皂苷生物合成密切的通路有萜类骨架生物合成途径(ko00900)和甾体生物合成途径(ko00100), 进一步分析, 发现63条unigenes参与萜类骨架生物合成途径, 55条unigenes参与甾体生物合成途径。
基于重楼皂苷下游合成通路中相关酶的文献[4, 11-13]报道, 对比本地转录组数据库, 本研究共鉴定出26个CYP基因和20个UGT基因, 包括9条PpCYP90G4、2条PpCYP94D108、7条PpCYP94D109、8条PpCYP72A616、15条PpUGT73C1和5条PpUGT80A40。另外, 两组样品的表达量水平结果显示PacBio_transcript_47741、PacBio_transcript_47840、PacBio_transcript_47945、PacBio_transcript_47736、PacBio_transcript_48072、PacBio_transcript_48081、PacBio_transcript_48462、PacBio_transcript_48495、PacBio_transcript_45627均在HS中上调, 在LS中下调(图5A)。
通过对8种重楼皂苷含量与候选基因进行相关性分析, 保留相关系数绝对值大于0.8的结果, 共得到27个候选基因, 与重楼皂苷呈现显著正相关的基因共有14个(图5B)。多数候选基因与重楼皂苷Ⅰ、Ⅱ、Ⅲ和Ⅶ呈现显著相关性, 均与之呈现显著正相关的基因共有7个。与重楼皂苷Ⅰ~Ⅲ、Ⅴ~Ⅶ和纤细薯蓣皂苷分别呈现显著正相关的基因依次为8、8、9、3、2、9和1个。
PpCYP90G4是调控胆固醇向16, 22-羟基胆固醇转化的重要酶, PpCYP94D108、PpCYP94D109和PpCYP72A616参与催化16, 22-羟基胆固醇合成薯蓣皂苷元(图5C), 本研究中1条PpCYP90G4 (PacBio_transcript_47247)与重楼皂苷Ⅵ呈现显著正相关, 但PacBio_transcript_47247和其余4条PpCYP90G4 (PacBio_transcript_46319、PacBio_transcript_46952、PacBio_transcript_47018、PacBio_transcript_47605)均与重楼皂苷Ⅰ、Ⅱ、Ⅲ、Ⅶ呈现负相关。1条PpCYP94D108 (PacBio_transcript_38108)与纤细薯蓣皂苷呈现显著正相关; 1条PpCYP94D109 (PacBio_transcript_47741)与重楼皂苷Ⅰ、Ⅱ、Ⅲ、Ⅴ均呈现显著正相关, 2条PpCYP94D109 (PacBio_transcript_47840、PacBio_transcript_47945)与重楼皂苷Ⅰ、Ⅱ、Ⅲ、Ⅶ均呈现显著正相关。1条PpCYP72A616 (PacBio_transcript_19726)与重楼皂苷Ⅴ的含量呈现显著正相关; 1条PpCYP72A616 (PacBio_transcript_47674)与重楼皂苷Ⅵ呈现显著正相关。PpUGT73C1参与合成偏诺皂苷元-3-O-葡萄糖苷与延龄草苷(图5C), 本研究共鉴定了9条与重楼皂苷有显著相关性的PpUGT73C1, 其中5条(PacBio_transcript_47736、PacBio_transcript_48072、PacBio_transcript_48081、PacBio_transcript_48462、PacBio_transcript_48495)与重楼皂苷Ⅰ、Ⅱ、Ⅲ、Ⅶ呈现显著正相关; 2条PpUGT80A40与重楼皂苷合成具有相关性的基因中, 1条(PacBio_transcript_45627)与重楼皂苷Ⅶ呈现显著正相关, 另1条(PacBio_transcript_41795)与重楼皂苷Ⅲ、Ⅶ均呈现显著正相关(图5B)。
为了提高候选基因的功能可信度与筛选效率, 减少非功能基因或低可信度序列的干扰, 本研究排除上述与重楼皂苷含量呈显著正相关但开放阅读框(ORF)长度不足1 000 bp的基因后, 最终获得7个基因的蛋白质结构预测图(图6)。这些基因被确定为重楼皂苷合成的关键候选基因。
为了挖掘滇重楼中可能参与甾体皂苷合成调控的转录因子, 使用了转录因子预测生物信息学方法。HS与LS比较, 共鉴定了737个转录因子(图7A), 其中SNF2占比较大, 一共85个, 其次是FAR1 (51个)、C3H (43个)、PHD (42个)、SET (38个)、B3-ARF (32个)、GRAS (28个)、MYB-related (26个)和Jumonji (24个)。另外, 共鉴定到14个MYB、10个AP2/ERF、10个bHLH、6个WRKY和9个bZIP。与上述7个基因呈正相关且相关阈值在0.95或以上, P < 0.05的转录因子共有80个, 分别来自40个家族, 其中2个转录因子未被归属。与2个及以上的候选基因呈正相关且相关阈值在0.95或以上的转录因子共有8个(图7B), 分别来自GRAS、FAR1、SNF2、bZIP、AP2/ERF-ERF、TUB和Pseudo ARR-B家族, 其中1个转录因子未被归属。此外, 与候选基因PacBio_transcript_45627呈正相关且相关阈值在0.95或以上, P < 0.05的转录因子仅有1个(PacBio_ transcript_34220), 来自LUG家族。
根据苷元C-17位是否含有氧取代基, 重楼皂苷可分为薯蓣皂苷类和偏诺皂苷类。其中, 重楼皂苷Ⅵ、Ⅶ、H属于偏诺皂苷类, 而重楼皂苷Ⅰ~Ⅲ、Ⅴ和纤细薯蓣皂苷属于薯蓣皂苷类[22]。通过对HS与LS中8种重楼皂苷含量的测定, 结果显示两组样本中偏诺皂苷类皂苷含量分别为4.23和2.03 mg·g-1, 差异不显著, 而HS与LS中薯蓣皂苷类皂苷含量分别为20.58和3.90 mg·g-1, 分别占总皂苷含量的83%和65%。这表明两组总皂苷含量显著差异的主要源于薯蓣皂苷类皂苷在HS中大量累积, 其中重楼皂苷Ⅰ~Ⅲ的含量差异尤为突出。
由于滇重楼基因组的复杂性与资源匮乏[23], 探索重楼皂苷的生物合成途径面临诸多困难, 转录组测序成为研究重楼皂苷生物合成途径的重要方法。挖掘重楼皂苷下游合成通路中负责前体皂苷元糖基化的基因, 仍是该研究的重点。近年来重楼基因挖掘的报道中, Wang等[24]筛选出一个参与重楼皂苷生物合成的基因PpUGT2, Zhang等[25]发现2种共生菌能显著促进重楼皂苷的合成, 通过将内生菌接种到重楼根部, 后期运用转录组分析筛选出17个促进重楼皂苷合成的CYPs和2个UGTs, 曲别阿香等[26]筛选到17条unigenes参与薯蓣皂苷元的合成, 其中2条CYP90G4、1条CYP94D108、1条CYP94D109和1条CYP72A616; Xu等[27]研究中筛选到4条PpCYP90G4、1条PpCYP94D108、6条PpCYP94D109和10条PpUGT73C1。本研究筛选出3条PpCYP94D109 (PacBio_transcript_47741、PacBio_ transcript_47840、PacBio_transcript_47945)和5条PpUGT73C1 (PacBio_transcript_47736、PacBio_transcript_48072、PacBio_transcript_47081、PacBio_transcript_48462、PacBio_transcript_48495), 这些基因在HS中均呈现上调趋势, 且与重楼皂苷Ⅰ~Ⅲ、Ⅴ、Ⅶ呈正相关, 表明这8条转录本可能参与重楼皂苷Ⅰ~Ⅲ、Ⅴ、Ⅶ的生物合成, 另外, 1条PpCYP94D108 (PacBio_ transcript_38108)可能参与了纤细薯蓣皂苷的合成; PacBio_transcript_47247 (PpCYP90G4)、PacBio_transcript_47674 (PpCYP72A616)可能参与重楼皂苷Ⅵ的合成; PacBio_transcript_19726 (PpCYP72A616)可能参与重楼皂苷Ⅴ的合成; 1条PpUGT80A40 (PacBio_transcript_45627)可能参与重楼皂苷Ⅶ的合成, 另1条PpUGT80A40 (PacBio_transcript_41795)可能参与重楼皂苷Ⅲ、Ⅶ的合成。通过表达量分析和相关性分析, 并排除ORF较短的基因后, 对候选基因进行了蛋白结构预测, 最终筛选出7条关键候选基因。结果表明, 这7条候选基因与重楼皂苷的生物合成高度相关。
转录因子在调节植物生理生化过程中发挥着重要作用, 本研究鉴定的转录因子大多数来自SNF2、FAR1、C3H、PHD、B3-ARF、GRAS与MYB-related等家族。已有研究表明AP2/ERF、bHLH、MYB、WRKY和bZIP等转录因子可能参与甾体皂苷的合成[28-30], HD-ZIP Ⅰ亚家族的转录因子DZHDZ32可能是调控薯蓣皂苷元生物合成的重要潜在因子[31], bZIP家族转录因子PpTGA3在重楼中表达后, 重楼皂苷Ⅱ和重楼皂苷Ⅵ的含量显著增加[32]。本研究共鉴定到了14个MYB、10个AP2/ERF、10个bHLH、6个WRKY和9个bZIP, 7个候选基因与转录因子的互作网络分析结果显示, 80个转录因子与候选基因呈现正相关关系且相关系数在0.95或以上(P < 0.05), 8个转录因子与2个及以上的候选基因都呈现显著正相关(相关阈值≥ 0.95, P < 0.05), 这8个转录因子极可能参与了重楼皂苷的合成, 排除未被归类的转录因子, 分别来自7个家族, 其中1个属于bZIP家族、1个属于AP2/ERF-ERF。

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doi: 10.16438/j.0513-4870.2025-1342
  • 接收时间:2025-11-12
  • 首发时间:2026-09-21
  • 出版时间:2026-05-12
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  • 收稿日期:2025-11-12
  • 修回日期:2026-01-30
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    1云南中医药大学中药学院, 云南省南药可持续利用研究重点实验室, 云南 昆明 650500
    2西藏大学生态环境学院, 西藏自治区 拉萨 850000
    3云南中医药大学信息学院, 云南 昆明 650500

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2种不同金属材料的力学参数
科
Family
属数
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genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)
属
Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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