{
 "meta": {
  "title": "酶功能需求 — 热点突变证据图谱",
  "version": "20261031_V01",
  "date": "2026-10-31",
  "scope": "Taq / Tth / M-MLV RT / Bst / Pfu；诊断原料与科研酶工程",
  "method": "Europe PMC 检索 + 摘要/开放全文逐条抽取 + 厂商产品页对照；每条突变给 PMID/DOI 或明确标“未公开”。",
  "rules": [
   "只有摘要/全文直接支持的结论才进“突变”条目；间接推断降级为“候选/缺口”。",
   "同一 codon 不同氨基酸替换可能方向相反（如 Taq E708D 冷敏感 vs E708K 耐抑制）。",
   "商业酶（Bst 3.0、Omni Klentaq 等）公开的是性能，不是突变位点；不反推序列。",
   "厂商页只证明“产品宣称”，不是独立同行评审证据。",
   "不能用文献中的加标样本性能直接承诺临床样本 LoD/Ct。"
  ],
  "counts": {
   "requirements": 13,
   "mutations": 20,
   "citations": 33,
   "market": 6
  }
 },
 "requirements": [
  {
   "id": "blood",
   "group": "耐抑制",
   "name": "全血来源抑制物",
   "short": "全血",
   "inhibitors": "IgG、血红蛋白/血红素、乳铁蛋白、蛋白酶、白细胞组分",
   "readouts": "Ct 漂移、LOD、扩增效率、直接扩增允许血液比例",
   "question": "全血直接扩增时，酶要耐住哪些抑制物？有没有单点突变证据？",
   "evidence": "Taq codon 708 突变体在 KlenTaq1 或 Taq E626K/I707L 背景下，可耐 10–25% 全血；KlenTaq1 本身比全长 Taq 耐血 10–100 倍。",
   "status": "strong",
   "refs": [
    "kermekchiev2009",
    "igg2000",
    "blood2001",
    "nine1998"
   ],
   "muts": [
    "taq_E708K",
    "klenTaq_del"
   ]
  },
  {
   "id": "urine",
   "group": "耐抑制",
   "name": "尿液抑制物",
   "short": "尿液",
   "inhibitors": "尿素（>50 mM）、有机酸、盐、代谢产物、肠外营养代谢物",
   "readouts": "Ct 漂移、内标回收、尿素浓度分层",
   "question": "尿液直接扩增的主要抑制物是什么？是否有突变体能耐受？",
   "evidence": "尿素是尿液主要抑制成分，>50 mM 可抑制 PCR；透析/超滤可去除。未检索到针对尿液的 Taq 单点突变证据。",
   "status": "moderate",
   "refs": [
    "urine1991",
    "inhib2008"
   ],
   "muts": []
  },
  {
   "id": "ffpe",
   "group": "耐抑制",
   "name": "FFPE 包埋抑制物",
   "short": "FFPE",
   "inhibitors": "甲醛交联、片段化 DNA、二甲苯/乙醇残留、石蜡",
   "readouts": "短扩增子回收、Ct、DNA 完整性",
   "question": "FFPE DNA 的抑制是交联、片段化还是酶被抑制？",
   "evidence": "FFPE DNA 可抑制 DNA 聚合酶；抑制不只来自模板完整性不足。未检索到 FFPE 特异的聚合酶单点突变。",
   "status": "moderate",
   "refs": [
    "ffpe2013"
   ],
   "muts": []
  },
  {
   "id": "extraction",
   "group": "耐抑制",
   "name": "提取试剂残留抑制物",
   "short": "提取残留",
   "inhibitors": "SDS、胍盐、酚、乙醇、EDTA、高盐、Triton X-100",
   "readouts": "Mg²⁺ 可用性、pH、离子强度、Ct",
   "question": "哪些提取试剂会抑制 PCR？BSA/gp32 能救哪些？",
   "evidence": "BSA/gp32 可缓解 FeCl₃、血红素、腐殖酸、单宁酸、粪便提取物；对胆汁盐、胆红素、EDTA、NaCl、SDS、Triton X-100 无明显缓解。",
   "status": "moderate",
   "refs": [
    "bsa1996",
    "review2013"
   ],
   "muts": []
  },
  {
   "id": "stool",
   "group": "耐抑制",
   "name": "粪便抑制物",
   "short": "粪便",
   "inhibitors": "复杂多糖、胆汁盐、胆红素、植物来源多酚",
   "readouts": "Ct、内标、稀释线性",
   "question": "粪便直扩的抑制物类型与可用策略？",
   "evidence": "粪便中的抑制物为复杂多糖，可能来自膳食植物材料；BSA/gp32 对粪便提取物有缓解，但对胆汁盐无效。",
   "status": "moderate",
   "refs": [
    "stool1997",
    "bsa1996"
   ],
   "muts": []
  },
  {
   "id": "swab",
   "group": "耐抑制",
   "name": "样品拭子抑制物",
   "short": "拭子",
   "inhibitors": "黏液、血红蛋白、上皮细胞、保存液、提取残留",
   "readouts": "内标、Ct、采样基质分层",
   "question": "拭子样本的抑制物如何去除？",
   "evidence": "肛拭子/组织样本用 2 M NaCl + 2 mM EDTA 高盐洗涤可显著去除抑制剂；没有聚合酶突变层面的直接证据。",
   "status": "moderate",
   "refs": [
    "swab2009"
   ],
   "muts": []
  },
  {
   "id": "buffer",
   "group": "耐抑制",
   "name": "PBS / Tris / HEPES 残留",
   "short": "缓冲液",
   "inhibitors": "PBS 磷酸盐结合 Mg²⁺；Tris/HEPES 残留改变 pH/离子强度；高盐",
   "readouts": "Mg²⁺ 滴定、pH、空白对照、Ct",
   "question": "PBS/Tris/HEPES 残留为什么会抑制？",
   "evidence": "PBS 的磷酸盐可结合游离 Mg²⁺；Tris/HEPES 本身不是强抑制物，但残留会改变 pH/离子强度。此类问题优先靠缓冲液置换/稀释，不是靠突变。",
   "status": "gap",
   "refs": [
    "review2013"
   ],
   "muts": []
  },
  {
   "id": "speed",
   "group": "性能",
   "name": "快速扩增",
   "short": "快速",
   "inhibitors": "—",
   "readouts": "kb/5 min、延伸时间、Ct、长片段产量",
   "question": "哪些突变能提高延伸速度？代价是什么？",
   "evidence": "Taq E742/A743 正电荷突变体延伸 >8 kb/5 min（WT 0.7 kb/5 min），但 DNA 结合过紧可能带来非特异结合。",
   "status": "strong",
   "refs": [
    "yamagami2014"
   ],
   "muts": [
    "taq_E742R_A743R",
    "taq_E742K_A743K",
    "taq_SD"
   ]
  },
  {
   "id": "gcat",
   "group": "性能",
   "name": "高 GC / 高 AT 兼容",
   "short": "GC/AT",
   "inhibitors": "高 GC 二级结构、AT 富集低 Tm、引物错配",
   "readouts": "GC/AT 梯度模板、Ct、产量、特异性",
   "question": "高 GC/AT 模板的酶工程证据有哪些？",
   "evidence": "Taq S543N 可减少高 GC/强二级结构导致的 pausing；SD Taq 突变体改善 GC-rich 扩增；商业端以 PrimeSTAR GXL、Platinum II 为代表。高 AT 的直接突变证据较弱。",
   "status": "moderate",
   "refs": [
    "s543n1999",
    "sd2014",
    "inhib2008"
   ],
   "muts": [
    "taq_S543N",
    "taq_SD"
   ]
  },
  {
   "id": "exo",
   "group": "性能",
   "name": "外切酶活性提升",
   "short": "外切酶",
   "inhibitors": "—",
   "readouts": "5'→3' 核酸酶切割；3'→5' 校对活性；错误率",
   "question": "外切酶活性提升是指 5′ 核酸酶还是 3′→5′ 校对？",
   "evidence": "Taq 天然有 5′→3′ 核酸酶、缺 3′→5′ 校对；N 端缺失会移除 5′ 核酸酶。1997 年工程化 Taq 活性位点使 3′→5′ 外切活性约为 WT 的 2 倍；Pfu 天然有 3′→5′ 外切，D215A 可使其失活。",
   "status": "moderate",
   "refs": [
    "exo1997",
    "klentaq1992",
    "pfu2009",
    "pfu1996"
   ],
   "muts": [
    "taq_exo_engineered",
    "pfu_D215A",
    "klenTaq_del"
   ]
  },
  {
   "id": "specificity",
   "group": "性能",
   "name": "特异性 / 热启动",
   "short": "特异性",
   "inhibitors": "低温错配延伸、引物二聚体、非特异扩增",
   "readouts": "NTC、熔解曲线、非特异条带、Ct 差异",
   "question": "提高特异性的突变/机制有哪些？",
   "evidence": "冷敏感 Taq 突变（E626K、I707L、E708D、W706R）在 37℃ 活性下降、68℃ 保持活性；抗体热启动是另一条成熟路线。",
   "status": "strong",
   "refs": [
    "kermekchiev2003",
    "i707l2015",
    "taqstart1994"
   ],
   "muts": [
    "taq_cold_E626K",
    "taq_cold_I707L",
    "taq_cold_E708D",
    "taq_cold_W706R",
    "taq_hotstart_ab"
   ]
  },
  {
   "id": "rt_heat",
   "group": "性能",
   "name": "逆转录酶耐热 / 持续合成",
   "short": "RT 耐热",
   "inhibitors": "RNA 二级结构、高温失活、RNase H 降解",
   "readouts": "55℃ 半衰期、最长 cDNA、RT-PCR Ct",
   "question": "MMLV RT 的耐热与持续合成有哪些突变？",
   "evidence": "M5（E69K/E302R/W313F/L435G/N454K）把 55℃ 半衰期从 <5 min 提到约 30 min；D200N/L603W/T330P/L139P/E607K 组合把持续合成提到 1500 nt、7.5 kb 全长 cDNA 合成温度提到 62℃。",
   "status": "strong",
   "refs": [
    "arezi2009",
    "baranauskas2012",
    "mmulv2021"
   ],
   "muts": [
    "mmlv_M5",
    "mmlv_processive",
    "mmlv_RNaseH"
   ]
  },
  {
   "id": "salt_lamp",
   "group": "性能",
   "name": "耐盐 / LAMP 等温扩增",
   "short": "耐盐/LAMP",
   "inhibitors": "高盐、链置换障碍、逆转录步骤",
   "readouts": "LAMP 起峰时间、耐盐浓度、RT-LAMP 单酶性能",
   "question": "Bst 耐盐与 RT-LAMP 有哪些突变/产品证据？",
   "evidence": "Bst 3.0 在高中度抑制物与全血中可做 RT-LAMP，并具显著 RT 活性；Bst 2.0 厂商称其耐盐性高于 WT Bst；具体商业变体突变位点未公开。",
   "status": "moderate",
   "refs": [
    "bst32016",
    "bst2023",
    "bst2025review"
   ],
   "muts": [
    "bst_3_0",
    "bst_ML_variants"
   ]
  }
 ],
 "mutations": [
  {
   "id": "taq_E708K",
   "enzyme": "Taq",
   "family": "Taq DNA 聚合酶",
   "mutation": "E708K（及 E708L/N/I/Q/W）",
   "context": "KlenTaq1 或 Taq E626K/I707L 冷敏感背景",
   "domain": "P domain（704–717，手指域表面）",
   "reqs": [
    "blood",
    "extraction"
   ],
   "effect": "与冷敏感背景组合后，全血/血浆/血红蛋白/乳铁蛋白/IgG/土壤腐殖酸耐受显著提高；全长 Taq 10/12 可耐 10–15% 全血，KlenTaq 10 可耐 20%。",
   "evidence": "strong",
   "refs": [
    "kermekchiev2009"
   ],
   "baorui": "Taq 族 E02/E03/E07/E09/E15/E20；不代表宝锐货号含该突变。",
   "caveat": "不是单点在野生型 Taq 背景下的独立效果；不同突变组合与缓冲体系差异大。"
  },
  {
   "id": "klenTaq_del",
   "enzyme": "Taq",
   "family": "Taq DNA 聚合酶",
   "mutation": "N 端缺失（KlenTaq1，起始 Met236）",
   "context": "缺失 5′→3′ 核酸酶域",
   "domain": "N 端 5′ 核酸酶域（1–290）",
   "reqs": [
    "blood",
    "extraction",
    "exo"
   ],
   "effect": "对全血抑制的耐受比全长 WT Taq 高 10–100 倍；同时缺失 5′ 核酸酶活性，PCR 保真度约提高 2 倍。",
   "evidence": "strong",
   "refs": [
    "kermekchiev2009",
    "klentaq1992"
   ],
   "baorui": "Taq 族；不适用于需要 5′ 核酸酶切割的 TaqMan 探针体系。",
   "caveat": "不是点突变；会牺牲 5′ 核酸酶功能，TaqMan 探针切割型体系需谨慎。"
  },
  {
   "id": "taq_cold_E626K",
   "enzyme": "Taq",
   "family": "Taq DNA 聚合酶",
   "mutation": "E626K",
   "context": "KlenTaq1 单突变",
   "domain": "手指域铰链区表面",
   "reqs": [
    "specificity"
   ],
   "effect": "37℃ 活性显著降低，68℃ 保持接近正常活性；提供热启动效果。",
   "evidence": "strong",
   "refs": [
    "kermekchiev2003"
   ],
   "baorui": "Taq 族；宝锐 HS/热启动产品为独立配方，不能等同。",
   "caveat": "单点冷敏感；对 95℃ 耐受与 WT 无显著差异。"
  },
  {
   "id": "taq_cold_I707L",
   "enzyme": "Taq",
   "family": "Taq DNA 聚合酶",
   "mutation": "I707L",
   "context": "KlenTaq1 单突变；Cs3C",
   "domain": "手指域铰链区，距活性位点 >20 Å",
   "reqs": [
    "specificity"
   ],
   "effect": "室温活性下降而不影响扩增能力；结构上通过 F749 旋转与模板 5′ 突出碱基堆叠阻断低温活性位点。",
   "evidence": "strong",
   "refs": [
    "kermekchiev2003",
    "i707l2015"
   ],
   "baorui": "Taq 族；可对照 HS Taq 的冷启动/热启动差异。",
   "caveat": "机制研究为 KlenTaq1 背景；全长 Taq 需实测。"
  },
  {
   "id": "taq_cold_E708D",
   "enzyme": "Taq",
   "family": "Taq DNA 聚合酶",
   "mutation": "E708D",
   "context": "KlenTaq1 单突变",
   "domain": "P domain 表面",
   "reqs": [
    "specificity"
   ],
   "effect": "冷敏感，37℃ 活性降低；与 E708K/L 的耐抑制方向不同。",
   "evidence": "strong",
   "refs": [
    "kermekchiev2003"
   ],
   "baorui": "Taq 族；仅作位点知识，不推荐直接照搬。",
   "caveat": "同一 codon 不同替换方向不同：D 偏冷敏感，K/L/N/I/Q 偏耐抑制。"
  },
  {
   "id": "taq_cold_W706R",
   "enzyme": "Taq",
   "family": "Taq DNA 聚合酶",
   "mutation": "W706R",
   "context": "KlenTaq1 单突变",
   "domain": "P domain 表面",
   "reqs": [
    "specificity"
   ],
   "effect": "冷敏感，降低低温非特异延伸；属于 706–708 热点簇。",
   "evidence": "strong",
   "refs": [
    "kermekchiev2003"
   ],
   "baorui": "Taq 族；用于理解 706–708 热点。",
   "caveat": "与 E708 突变可能存在上位效应，不能简单叠加。"
  },
  {
   "id": "taq_hotstart_ab",
   "enzyme": "Taq",
   "family": "Taq DNA 聚合酶",
   "mutation": "抗体/适配体热启动（非共价）",
   "context": "TaqStart 单抗；适配体热启动",
   "domain": "酶表面/活性位点遮蔽",
   "reqs": [
    "specificity"
   ],
   "effect": "室温抑制聚合酶，70℃ 以上释放；减少引物二聚体与非特异延伸。",
   "evidence": "peer-reviewed",
   "refs": [
    "taqstart1994"
   ],
   "baorui": "宝锐 HS Taq / Hyperstart 系列为热启动配方，具体机制按产品说明书。",
   "caveat": "不是基因突变；不同抗体/适配体的释放温度与可逆性不同。"
  },
  {
   "id": "taq_E742R_A743R",
   "enzyme": "Taq",
   "family": "Taq DNA 聚合酶",
   "mutation": "E742R / A743R",
   "context": "TaqRR，手指域 742/743 正电荷工程",
   "domain": "手指域 O-helix 附近",
   "reqs": [
    "speed",
    "gcat"
   ],
   "effect": "延伸 >8 kb/5 min（WT 0.7 kb/5 min），DNA 结合 KD 约 9 nM（WT 400 nM）；PCR 性能提高。",
   "evidence": "strong",
   "refs": [
    "yamagami2014"
   ],
   "baorui": "Taq 族 E02/E03 等；宝锐现有货号未声明携带该突变。",
   "caveat": "DNA 结合过紧可能增加非特异结合；酶活比活下降，需按体系重新优化。"
  },
  {
   "id": "taq_E742K_A743K",
   "enzyme": "Taq",
   "family": "Taq DNA 聚合酶",
   "mutation": "E742K / A743K",
   "context": "TaqKK，正电荷工程",
   "domain": "手指域 O-helix 附近",
   "reqs": [
    "speed",
    "gcat"
   ],
   "effect": "延伸 >8 kb/5 min；与 RR 类似的 DNA 高亲和与快速延伸。",
   "evidence": "strong",
   "refs": [
    "yamagami2014"
   ],
   "baorui": "Taq 族；可对照快速 PCR 需求。",
   "caveat": "不同正电荷组合的比活/非特异平衡不同，需实测。"
  },
  {
   "id": "taq_S543N",
   "enzyme": "Taq",
   "family": "Taq DNA 聚合酶",
   "mutation": "S543N",
   "context": "KlentaqN（large fragment）",
   "domain": "拇指域",
   "reqs": [
    "gcat"
   ],
   "effect": "减少模板结构导致的 pausing；可扩增高 GC/强二级结构模板。",
   "evidence": "moderate",
   "refs": [
    "s543n1999"
   ],
   "baorui": "Taq 族；高 GC 体系可对照 E15/E20 等。",
   "caveat": "摘要级证据；具体 GC 上限与缓冲体系需查原文/实测。"
  },
  {
   "id": "taq_SD",
   "enzyme": "Taq",
   "family": "Taq DNA 聚合酶",
   "mutation": "SD DNA polymerase（具体突变未公开）",
   "context": "商业/专利化突变体",
   "domain": "未公开",
   "reqs": [
    "gcat",
    "speed"
   ],
   "effect": "强链置换活性；改善 GC-rich、复杂二级结构、长片段与 LAMP/PCDR。",
   "evidence": "low",
   "refs": [
    "sd2014"
   ],
   "baorui": "Taq 族；仅作竞品/技术路线参考。",
   "caveat": "摘要未披露具体突变位点；不能直接复现。"
  },
  {
   "id": "taq_exo_engineered",
   "enzyme": "Taq",
   "family": "Taq DNA 聚合酶",
   "mutation": "活性位点羧基工程（残基未在摘要披露）",
   "context": "1997 年蛋白工程",
   "domain": "3′→5′ 外切酶活性位点（292–423）",
   "reqs": [
    "exo"
   ],
   "effect": "构建双金属离子催化模块后，3′→5′ 外切活性约为 WT 的 2 倍。",
   "evidence": "low",
   "refs": [
    "exo1997"
   ],
   "baorui": "Taq 族；若要做校对型 Taq，需另行验证。",
   "caveat": "摘要未给具体残基；未检索到后续独立复现；不能据此承诺纠错率。"
  },
  {
   "id": "pfu_D215A",
   "enzyme": "Pfu",
   "family": "Pfu DNA 聚合酶",
   "mutation": "D215A",
   "context": "Pfu 3′→5′ 外切酶失活突变",
   "domain": "3′→5′ 外切酶活性位点",
   "reqs": [
    "exo"
   ],
   "effect": "3′→5′ 外切酶活性被禁用；常作为 exo- 对照。Pfu WT 错误率约 1.3×10⁻⁶，exo- Pfu 约 5×10⁻⁵。",
   "evidence": "strong",
   "refs": [
    "pfu2009",
    "pfu1996"
   ],
   "baorui": "Pfu 族 E32；宝锐 Pfu 为天然校对酶，不等于 D215A。",
   "caveat": "这是“失活”证据，不是“提升”突变；提升校对应选天然 B 族酶或定向进化。"
  },
  {
   "id": "mmlv_M5",
   "enzyme": "MMLV",
   "family": "M-MLV 逆转录酶",
   "mutation": "E69K / E302R / W313F / L435G / N454K",
   "context": "M5 五重突变",
   "domain": "连接域/RNase H 附近",
   "reqs": [
    "rt_heat"
   ],
   "effect": "55℃ 半衰期由 <5 min 提升到约 30 min；25–70℃ 比活提高；高二级结构 RNA 的 cDNA 产量与 RT-PCR 性能提高。",
   "evidence": "strong",
   "refs": [
    "arezi2009"
   ],
   "baorui": "RT 族 E12/E13/E29/E42/E43；不代表宝锐货号含 M5。",
   "caveat": "不同 RT 模板/引物体系差异大；更耐热不等于耐抑制。"
  },
  {
   "id": "mmlv_processive",
   "enzyme": "MMLV",
   "family": "M-MLV 逆转录酶",
   "mutation": "D200N / L603W / T330P / L139P / E607K",
   "context": "五重突变体",
   "domain": "聚合酶域/连接域",
   "reqs": [
    "rt_heat"
   ],
   "effect": "持续合成提高到 1500 nt（约 65×）；7.5 kb 全长 cDNA 合成温度提高到 62℃。",
   "evidence": "strong",
   "refs": [
    "baranauskas2012"
   ],
   "baorui": "RT 族 E12/E13/E29/E42/E43；不代表宝锐货号含该组合。",
   "caveat": "组合突变体；单点贡献与背景相关。"
  },
  {
   "id": "mmlv_RNaseH",
   "enzyme": "MMLV",
   "family": "M-MLV 逆转录酶",
   "mutation": "D524G / E562Q / D583N（RNase H 失活）",
   "context": "RNase H- 商业变体（如 SuperScript II/III 路线）",
   "domain": "RNase H 域",
   "reqs": [
    "rt_heat"
   ],
   "effect": "降低 RNase H 对 RNA/DNA 杂交链的降解，提高 cDNA 产量与高温合成能力；RNase H- 在高温下更稳定。",
   "evidence": "strong",
   "refs": [
    "rnaseh1989",
    "rnaseh2002",
    "mmulv2021"
   ],
   "baorui": "RT 族；宝锐 Neoscript 系列的具体 RNase H 状态按说明书。",
   "caveat": "RNase H 失活可能改变 cDNA 末端与长链合成表现；不是所有体系都受益。"
  },
  {
   "id": "bst_3_0",
   "enzyme": "Bst",
   "family": "Bst DNA 聚合酶",
   "mutation": "商业工程化变体（具体突变未公开）",
   "context": "Bst 3.0",
   "domain": "未公开",
   "reqs": [
    "salt_lamp"
   ],
   "effect": "耐高浓度扩增抑制物；可在纯水与全血中做 RT-LAMP；具显著 RT 活性（可达 72℃）。",
   "evidence": "moderate",
   "refs": [
    "bst32016"
   ],
   "baorui": "Bst 族 E101/E102/E103/E105；宝锐 Bst 3.0 HS 为同类定位，具体突变未公开。",
   "caveat": "商业酶性能证据不等于突变位点公开；不能反推氨基酸替换。"
  },
  {
   "id": "bst_ML_variants",
   "enzyme": "Bst",
   "family": "Bst DNA 聚合酶",
   "mutation": "机器学习预测的多点组合（摘要未列位点）",
   "context": "Bst ML variants + villin 融合域",
   "domain": "全酶/多结构域",
   "reqs": [
    "salt_lamp",
    "speed"
   ],
   "effect": "热变性温度最高 +2.5℃；可在 73℃ 做 LAMP，而 Bst 2.0 在该温度失活。",
   "evidence": "moderate",
   "refs": [
    "bst2023",
    "bst2025review"
   ],
   "baorui": "Bst 族 E101–E105；仅作工程路线参考。",
   "caveat": "摘要未列具体突变；融合域与突变叠加，不能拆成单点结论。"
  },
  {
   "id": "tth_phenol",
   "enzyme": "Tth",
   "family": "Tth DNA 聚合酶",
   "mutation": "无（天然酶特性）",
   "context": "Tth 野生型",
   "domain": "全酶",
   "reqs": [
    "extraction"
   ],
   "effect": "在 2–5% 酚饱和 PBS 中保持 DNA/RNA 依赖的聚合酶活性；Taq 在相同条件下失活。",
   "evidence": "moderate",
   "refs": [
    "tthphenol1994"
   ],
   "baorui": "Tth 族 E06/E10/E17；可对照酚/胍残留场景。",
   "caveat": "不是突变；酚耐受机制未在摘要中说明；不能推导其他提取试剂。"
  },
  {
   "id": "tth_rt",
   "enzyme": "Tth",
   "family": "Tth DNA 聚合酶",
   "mutation": "无（天然酶特性）",
   "context": "Tth + Mn²⁺",
   "domain": "聚合酶域",
   "reqs": [
    "rt_heat"
   ],
   "effect": "Mn²⁺ 条件下具高效 RT 活性；可单酶完成 RT-PCR，对 RNA 二级结构容忍度较高。",
   "evidence": "strong",
   "refs": [
    "tthrt1991"
   ],
   "baorui": "Tth 族 E06/E10/E17；宝锐 Tth 的 RT 应用按说明书。",
   "caveat": "需要 Mn²⁺，与 Mg²⁺ 体系不直接互换；扩增特异性/保真度需实测。"
  }
 ],
 "citations": {
  "kermekchiev2009": {
   "pmid": "19208643",
   "doi": "10.1093/nar/gkn1055",
   "title": "Mutants of Taq DNA polymerase resistant to PCR inhibitors allow DNA amplification from whole blood and crude soil samples",
   "journal": "Nucleic Acids Research",
   "year": 2009,
   "quote": "Further mutations at codon 708, both in Klentaq 1 and Taq, confer enhanced resistance to various inhibitors ... whole blood, plasma, hemoglobin, lactoferrin, serum IgG, soil extracts and humic acid.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/19208643/"
  },
  "kermekchiev2003": {
   "pmid": "14576300",
   "doi": "10.1093/nar/gkg813",
   "title": "Cold-sensitive mutants of Taq DNA polymerase provide a hot start for PCR",
   "journal": "Nucleic Acids Research",
   "year": 2003,
   "quote": "Mutations of Klentaq ... markedly reduced activity at 37°C yet retain apparently normal activity at 68°C ... can provide a hot start for PCR and exhibit slightly improved fidelity.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/14576300/"
  },
  "i707l2015": {
   "pmid": "25537790",
   "doi": "10.1021/bi501198f",
   "title": "A conservative isoleucine to leucine mutation causes major rearrangements and cold sensitivity in KlenTaq1 DNA polymerase",
   "journal": "Biochemistry",
   "year": 2015,
   "quote": "Mutation of isoleucine 707 to leucine ... substantially decreases its activity at room temperature without compromising its ability to amplify DNA.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/25537790/"
  },
  "yamagami2014": {
   "pmid": "25232352",
   "doi": "10.3389/fmicb.2014.00461",
   "title": "Mutant Taq DNA polymerases with improved elongation ability as a useful reagent for genetic engineering",
   "journal": "Frontiers in Microbiology",
   "year": 2014,
   "quote": "Two residues, E742 and A743, in Taq polymerase were found to be critical for its elongation ability ... higher DNA affinity and faster primer extension ability.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/25232352/"
  },
  "s543n1999": {
   "pmid": "10217428",
   "doi": "10.1016/s0014-5793(99)00353-1",
   "title": "Mutation S543N in the thumb subdomain of the Taq DNA polymerase large fragment suppresses pausing associated with the template structure",
   "journal": "FEBS Letters",
   "year": 1999,
   "quote": "The mutant enzyme (KlentaqN DNA polymerase) provides specific PCR amplification and sequencing of difficult templates, e.g. those with a high GC% content or strong secondary structure.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/10217428/"
  },
  "sd2014": {
   "pmid": "25109293",
   "doi": "10.2144/000114198",
   "title": "A strong strand displacement activity of thermostable DNA polymerase markedly improves the results of DNA amplification",
   "journal": "BioTechniques",
   "year": 2014,
   "quote": "A novel Taq DNA polymerase mutant (SD DNA polymerase), which has a strong strand displacement activity ... improvement in ... GC-rich and complex secondary structure templates.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/25109293/"
  },
  "exo1997": {
   "pmid": "9264032",
   "doi": "10.1016/s1016-8478(23)13315-2",
   "title": "Improvement of the 3'-5' exonuclease activity of Taq DNA polymerase by protein engineering in the active site",
   "journal": "Molecules and Cells",
   "year": 1997,
   "quote": "The mutant Taq DNA polymerase shows twice as much the 3'-5' exonuclease activity as that of wild-type DNA polymerase.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/9264032/"
  },
  "klentaq1992": {
   "pmid": "1551596",
   "doi": "10.1016/0378-1119(92)90299-5",
   "title": "The fidelity of Taq polymerase catalyzing PCR is improved by an N-terminal deletion",
   "journal": "Gene",
   "year": 1992,
   "quote": "The measured relative mutation rate was twofold lower for KlenTaq as compared to the full-length Taq DNA polymerase.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/1551596/"
  },
  "taqstart1994": {
   "pmid": "8074881",
   "doi": "",
   "title": "TaqStart Antibody: \"hot start\" PCR facilitated by a neutralizing monoclonal antibody directed against Taq DNA polymerase",
   "journal": "BioTechniques",
   "year": 1994,
   "quote": "Monoclonal antibodies (MAbs) raised in mice to the purified DNA polymerase of Thermus aquaticus (Taq) were selected for their ability to reversibly block polymerase activity.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/8074881/"
  },
  "arezi2009": {
   "pmid": "19056821",
   "doi": "10.1093/nar/gkn952",
   "title": "Novel mutations in Moloney Murine Leukemia Virus reverse transcriptase increase thermostability through tighter binding to template-primer",
   "journal": "Nucleic Acids Research",
   "year": 2009,
   "quote": "Five mutations E69K, E302R, W313F, L435G and N454K ... increase the half-life of MMLV RT at 55°C from less than 5 min to approximately 30 min.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/19056821/"
  },
  "baranauskas2012": {
   "pmid": "22691702",
   "doi": "10.1093/protein/gzs034",
   "title": "Generation and characterization of new highly thermostable and processive M-MuLV reverse transcriptase variants",
   "journal": "Protein Engineering, Design and Selection",
   "year": 2012,
   "quote": "Combining D200N, L603W, T330P, L139P and E607K ... processivity ... 1500 nt (65-fold improvement) ... full-length 7.5-kb cDNA synthesis was raised to 62°C.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/22691702/"
  },
  "rnaseh1989": {
   "pmid": "2464706",
   "doi": "10.1128/jvi.63.3.1460-1464.1989",
   "title": "Inhibition of RNase H activity and viral replication by single mutations in the 3-prime region of Moloney murine leukemia virus reverse transcriptase",
   "journal": "Journal of Virology",
   "year": 1989,
   "quote": "Substitution of either of two conserved aspartic acid residues ... depressed RT-associated RNase H activity by more than 25-fold with little or no effect on polymerase activity.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/2464706/"
  },
  "rnaseh2002": {
   "pmid": "12136094",
   "doi": "10.1093/nar/gkf417",
   "title": "The role of template-primer in protection of reverse transcriptase from thermal inactivation",
   "journal": "Nucleic Acids Research",
   "year": 2002,
   "quote": "RNase H-minus RTs retained the ability to efficiently synthesize cDNA at much higher temperatures.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/12136094/"
  },
  "mmulv2021": {
   "pmid": "34900141",
   "doi": "10.1016/j.csbj.2021.11.030",
   "title": "M-MuLV reverse transcriptase: Selected properties and improved mutants",
   "journal": "Computational and Structural Biotechnology Journal",
   "year": 2021,
   "quote": "Superscript III harbors mutations H204R, T306K, F309N, V223H, D524G, E562Q, and D583N.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/34900141/"
  },
  "rnaseh2014": {
   "pmid": "25450388",
   "doi": "10.1016/j.bbrc.2014.10.044",
   "title": "Amino acid substitutions away from the RNase H catalytic site increase the thermal stability of Moloney murine leukemia virus reverse transcriptase through RNase H inactivation",
   "journal": "Biochemical and Biophysical Research Communications",
   "year": 2014,
   "quote": "An RNase H-deficient MMLV RT carrying the RNase H-inactivating mutation D524A ... was devoid of RNase H activity.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/25450388/"
  },
  "pfu2009": {
   "pmid": "19783818",
   "doi": "10.1093/nar/gkp800",
   "title": "The 3'-5' proofreading exonuclease of archaeal family-B DNA polymerase hinders the copying of template strand deaminated bases",
   "journal": "Nucleic Acids Research",
   "year": 2009,
   "quote": "D215A point mutant ... disabled in 3-5 exonuclease activity.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/19783818/"
  },
  "pfu1996": {
   "pmid": "8836181",
   "doi": "10.1093/nar/24.18.3546",
   "title": "PCR fidelity of pfu DNA polymerase and other thermostable DNA polymerases",
   "journal": "Nucleic Acids Research",
   "year": 1996,
   "quote": "Pfu (1.3 x 10(-6)) < ... Taq (8.0 x 10(-6)); exo- Pfu approximately 5 x 10(-5).",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/8836181/"
  },
  "bst2023": {
   "pmid": "34762799",
   "doi": "10.1021/acs.biochem.1c00451",
   "title": "Improved Bst DNA Polymerase Variants Derived via a Machine Learning Approach",
   "journal": "Biochemistry",
   "year": 2023,
   "quote": "Top predicted variants had greatly improved thermotolerance ... denaturation temperatures up to 2.5°C higher ... faster LAMP assays at 73°C.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/34762799/"
  },
  "bst32016": {
   "pmid": "28193014",
   "doi": "10.1021/acs.analchem.6b03460",
   "title": "Simple and Highly Sensitive Molecular Diagnosis of Zika Virus by Lateral Flow Assays",
   "journal": "Analytical Chemistry",
   "year": 2016,
   "quote": "Bst 3.0 polymerase ... robust and fast isothermal amplification performance even in the presence of high concentrations of inhibitors ... amplification of ZIKV RNA in pure water and human whole blood.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/28193014/"
  },
  "bst2025review": {
   "pmid": "41177494",
   "doi": "10.1016/j.ijbiomac.2025.148691",
   "title": "Engineering and enhancement of Bst DNA polymerase variants toward improved diagnostic applications: A review",
   "journal": "International Journal of Biological Macromolecules",
   "year": 2025,
   "quote": "Key mutation sites ... thermostability, strand displacement efficiency, fidelity, inhibitor tolerance, and nucleotide selectivity; fusion strategies ... salt tolerance.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/41177494/"
  },
  "inhib2008": {
   "pmid": "18755023",
   "doi": "10.1186/1756-0500-1-70",
   "title": "Differential susceptibility of PCR reactions to inhibitors: an important and unrecognised phenomenon",
   "journal": "BMC Research Notes",
   "year": 2008,
   "quote": "Susceptibility to inhibition was highly variable between reactions ... possible association with amplicon GC content.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/18755023/"
  },
  "urine1991": {
   "pmid": "1646235",
   "doi": "10.1136/jcp.44.5.360",
   "title": "Inhibitory effects of urine on the polymerase chain reaction for cytomegalovirus DNA",
   "journal": "Journal of Clinical Pathology",
   "year": 1991,
   "quote": "Urea was the major inhibitory component of urine and inhibited the PCR at a concentration of more than 50 mM.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/1646235/"
  },
  "ffpe2013": {
   "pmid": "24155973",
   "doi": "10.1371/journal.pone.0077771",
   "title": "Improved PCR performance using template DNA from formalin-fixed and paraffin-embedded tissues by overcoming PCR inhibition",
   "journal": "PLoS ONE",
   "year": 2013,
   "quote": "Poor PCR amplification was partly caused by inhibition of the DNA polymerase by fragmented DNA from FFPE tissue and not only due to the absence of intact template molecules.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/24155973/"
  },
  "stool1997": {
   "pmid": "9157172",
   "doi": "10.1128/jcm.35.4.995-998.1997",
   "title": "Complex polysaccharides as PCR inhibitors in feces: Helicobacter pylori model",
   "journal": "Journal of Clinical Microbiology",
   "year": 1997,
   "quote": "Inhibitors in feces are complex polysaccharides possibly originating from vegetable material in the diet.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/9157172/"
  },
  "bsa1996": {
   "pmid": "8975603",
   "doi": "10.1128/aem.62.3.1102-1106.1996",
   "title": "Relief of amplification inhibition in PCR with bovine serum albumin or T4 gene 32 protein",
   "journal": "Applied and Environmental Microbiology",
   "year": 1996,
   "quote": "BSA or gp32 relieved FeCl3, hemin, fulvic acids, humic acids, tannic acids, or extracts from feces; neither relieved bile salts, bilirubin, EDTA, NaCl, SDS, or Triton X-100.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/8975603/"
  },
  "swab2009": {
   "pmid": "19901277",
   "doi": "10.1177/104063870902100603",
   "title": "Removal of real-time reverse transcription polymerase chain reaction (RT-PCR) inhibitors associated with cloacal swab samples and tissues for improved diagnosis of Avian influenza virus by RT-PCR",
   "journal": "Journal of Veterinary Diagnostic Investigation",
   "year": 2009,
   "quote": "A modified protocol with an added high-salt wash of 2 M NaCl and 2 mM EDTA improved the ability to remove inhibitors from cloacal swabs.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/19901277/"
  },
  "igg2000": {
   "pmid": "10618113",
   "doi": "10.1128/jcm.38.1.345-350.2000",
   "title": "Identification and characterization of immunoglobulin G in blood as a major inhibitor of diagnostic PCR",
   "journal": "Journal of Clinical Microbiology",
   "year": 2000,
   "quote": "The major inhibitor in human plasma ... was found to be immunoglobulin G (IgG).",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/10618113/"
  },
  "blood2001": {
   "pmid": "11158094",
   "doi": "10.1128/jcm.39.2.485-493.2001",
   "title": "Purification and characterization of PCR-inhibitory components in blood cells",
   "journal": "Journal of Clinical Microbiology",
   "year": 2001,
   "quote": "Hemoglobin and lactoferrin were identified as PCR-inhibitor components in erythrocytes and leukocytes, respectively.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/11158094/"
  },
  "nine1998": {
   "pmid": "9758794",
   "doi": "10.1128/aem.64.10.3748-3753.1998",
   "title": "Capacity of nine thermostable DNA polymerases To mediate DNA amplification in the presence of PCR-inhibiting samples",
   "journal": "Applied and Environmental Microbiology",
   "year": 1998,
   "quote": "AmpliTaq Gold and Taq were totally inhibited in 0.004% blood, while HotTub, Pwo, rTth, and Tfl amplified in 20% blood without reduced sensitivity.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/9758794/"
  },
  "tthphenol1994": {
   "pmid": "8136148",
   "doi": "",
   "title": "A distinctive property of Tth DNA polymerase: enzymatic amplification in the presence of phenol",
   "journal": "PCR Methods and Applications",
   "year": 1994,
   "quote": "Tth DNA polymerase maintained DNA- and RNA-dependent DNA polymerase activities in 2%-5% phenol-saturated PBS; Taq was inactive.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/8136148/"
  },
  "tthrt1991": {
   "pmid": "1714296",
   "doi": "10.1021/bi00245a001",
   "title": "Reverse transcription and DNA amplification by a Thermus thermophilus DNA polymerase",
   "journal": "Biochemistry",
   "year": 1991,
   "quote": "Tth pol possesses efficient reverse transcriptase activity in the presence of MnCl2; greater than 100-fold more efficient in coupled RT/PCR than Taq pol.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/1714296/"
  },
  "direct2013": {
   "pmid": "24040090",
   "doi": "10.1371/journal.pone.0073845",
   "title": "Evaluation of inhibitor-resistant real-time PCR methods for diagnostics in clinical and environmental samples",
   "journal": "PLoS ONE",
   "year": 2013,
   "quote": "Nine inhibitor-resistant PCR reagents ... Omni Klentaq can amplify target DNA samples of up to 20% whole blood or soil ... no single chemistry performed best across all matrices.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/24040090/"
  },
  "review2013": {
   "pmid": "23104280",
   "doi": "10.1007/978-1-60327-353-4_2",
   "title": "Overcoming inhibition in real-time diagnostic PCR",
   "journal": "Methods in Molecular Biology",
   "year": 2013,
   "quote": "Thermostable DNA polymerases and buffer systems used in PCR are affected differently by inhibitors; sample treatment and chemistry must be optimized per sample type.",
   "kind": "peer-reviewed",
   "url": "https://pubmed.ncbi.nlm.nih.gov/23104280/"
  }
 },
 "market": [
  {
   "product": "Platinum II Taq Hot-Start DNA Polymerase",
   "vendor": "Thermo Fisher",
   "tag": "热启动 / 快速 / 耐抑制 / GC-AT",
   "claim": "抗体热启动；约 4× 于常规 Taq（15 s/kb）；厂商称对常见 PCR 抑制物有耐受；单 60℃ 退火；GC-rich 与 AT-rich 均覆盖。",
   "url": "https://www.thermofisher.com/us/en/home/life-science/pcr/pcr-enzymes-master-mixes/platinum-hot-start-pcr-enzyme.html",
   "kind": "vendor"
  },
  {
   "product": "PrimeSTAR GXL DNA Polymerase",
   "vendor": "Takara Bio",
   "tag": "高 GC / 高 AT / 长片段 / 高保真",
   "claim": "改造 B 族酶 + 延伸因子；GC/AT-rich、30 kb、FFPE/cfDNA；Premix Fast 10 s/kb。",
   "url": "https://www.takarabio.com/products/pcr/all-enzymes-and-accessories/primestar-series/primestar-gxl-dna-polymerase",
   "kind": "vendor"
  },
  {
   "product": "Phire / Phusion Direct PCR",
   "vendor": "Thermo Fisher",
   "tag": "直接扩增 / 耐抑制 / 快速",
   "claim": "Phire/Phusion 与小型 DNA 结合蛋白融合；耐未纯化样本抑制物；全血可达 40%；部分流程 <30 min。",
   "url": "https://www.thermofisher.com/us/en/home/brands/thermo-scientific/molecular-biology/thermo-scientific-pcr/direct-pcr-master-mixes-thermo-scientific.html",
   "kind": "vendor"
  },
  {
   "product": "KAPA3G HotStart DNA Polymerase",
   "vendor": "Roche / KAPA",
   "tag": "耐抑制 / GC-AT / 冻干 / 快速",
   "claim": "厂商称对粗血、组织、植物提取物耐抑制；GC/AT 均适用；lyo-ready；延伸可短至 1 s，PCR 时间最多降 75%。",
   "url": "https://custombiotech.roche.com/global/en/portfolio/kapa-dna-polymerases.html",
   "kind": "vendor"
  },
  {
   "product": "Bst 3.0 DNA Polymerase",
   "vendor": "NEB",
   "tag": "LAMP / 耐抑制 / RT 活性 / 快速",
   "claim": "厂商称高浓度扩增抑制物下仍稳健；RT 活性显著高于 Bst DNA Polymerase；推荐单酶 RT-LAMP。",
   "url": "https://www.neb.com/en/products/m0374-bst-3-0-dna-polymerase",
   "kind": "vendor"
  },
  {
   "product": "Omni Klentaq",
   "vendor": "DNA Polymerase Technology",
   "tag": "耐抑制 / 直接 PCR",
   "claim": "独立评价中可扩增最高 20% 全血或土壤提取物；但不同样本基质没有单一试剂全能。",
   "url": "https://pubmed.ncbi.nlm.nih.gov/24040090/",
   "kind": "peer-reviewed"
  }
 ],
 "gaps": [
  {
   "id": "gap_matrix",
   "title": "尿液/FFPE/粪便/拭子的“突变级”证据不足",
   "detail": "现有文献主要证明样本基质抑制与前处理/缓冲策略；没有可复核的“单点突变→该基质耐受”因果链。",
   "impact": "不能把全血 E708K 的结果外推到尿液/FFPE/粪便。",
   "action": "按基质做加标回收，至少 3 个浓度 × 3 批酶；先建立内标与稀释线性。",
   "owner": "研发/应用部"
  },
  {
   "id": "gap_exo5",
   "title": "Taq 5′→3′ 外切酶“提升”缺少单点突变",
   "detail": "Taq 的 5′ 核酸酶用于 TaqMan 切割；N 端缺失会移除该域。未检索到公开单点突变提升 5′ 核酸酶活性的强证据。",
   "impact": "若目标是 TaqMan 信号，不应通过 KlenTaq 化实现；若目标是校对，应走 3′→5′ 工程或 B 族酶。",
   "action": "先明确“外切酶”指 5′ 核酸酶还是 3′→5′ 校对，再立项。",
   "owner": "产品/研发"
  },
  {
   "id": "gap_bst",
   "title": "Bst 商业变体突变位点不公开",
   "detail": "Bst 3.0/2.0 仅有性能与厂商宣称，具体氨基酸替换未公开；2025 综述可提供工程路线但需全文。",
   "impact": "不能根据竞品性能反推突变；只能做性能对标。",
   "action": "购买/索取 Bst 3.0 说明书与质控数据；用同一 LAMP 体系做头对头。",
   "owner": "产品/采购"
  },
  {
   "id": "gap_at",
   "title": "高 AT 的直接酶突变证据弱",
   "detail": "高 GC 有 S543N、SD、PrimeSTAR GXL 等证据；高 AT 主要靠缓冲/添加剂/引物设计，缺少突变级证据。",
   "impact": "高 AT 模板不能简单归因于酶；先排查引物 Tm、Mg²⁺、添加剂。",
   "action": "建立 AT-rich 梯度模板 panel，区分酶与缓冲贡献。",
   "owner": "应用部"
  },
  {
   "id": "gap_clinical",
   "title": "缺临床样本大样本验证",
   "detail": "多数突变研究为加标/培养物/小样本；没有按病种、采样管、保存时间分层的临床性能。",
   "impact": "文献倍数不能直接变成产品规格或对客承诺。",
   "action": "与客户共建样本 panel；记录采样基质、保存时长、Ct、内标。",
   "owner": "大客户部/研发"
  },
  {
   "id": "gap_epistasis",
   "title": "突变组合存在上位效应",
   "detail": "Taq E708K 依赖 E626K/I707L 冷敏感背景；MMLV 多为五重突变；Bst 叠加融合域。单点结果不能线性相加。",
   "impact": "照搬文献组合可能不工作，甚至牺牲比活/特异性。",
   "action": "任何组合先在宝锐底盘酶上做单点回补，再测比活、热稳定、抑制物耐受。",
   "owner": "研发"
  },
  {
   "id": "gap_market",
   "title": "未写市场规模金额",
   "detail": "没有可核验的中国 PCR/RT 酶原料市场规模口径；本页只做产品与功能定位扫描，不写金额、份额。",
   "impact": "不能用本页做市场容量或预算依据。",
   "action": "如要市场金额，另立调研并明确全球/中国、出厂/终端、试剂/原料口径。",
   "owner": "市场部"
  }
 ]
}