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Ion Torrent - 版本历史
2026-04-09T20:52:06Z
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2026年2月4日 (三) 00:19 77921020
2026-02-04T00:19:31Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">←上一版本</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">2026年2月4日 (三) 00:19的版本</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l3" >第3行：</td>
<td colspan="2" class="diff-lineno">第3行：</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <div style="margin-bottom: 30px; border-bottom: 1.2px solid #e2e8f0; padding-bottom: 25px;"></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <div style="margin-bottom: 30px; border-bottom: 1.2px solid #e2e8f0; padding-bottom: 25px;"></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <p style="font-size: 1.1em; margin: 10px 0; color: #334155; text-align: justify;"></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <p style="font-size: 1.1em; margin: 10px 0; color: #334155; text-align: justify;"></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> <strong>Ion Torrent</strong> 是全球首款商业化的基于<strong>[[半导体芯片]]</strong>技术的<strong>[[二代测序]] (NGS)</strong> 平台，由 Jonathan Rothberg 团队发明，现归属于 <strong>[[Thermo Fisher Scientific]]</strong>（赛默飞世尔）。与 Illumina 和 PacBio 等依赖光学信号（荧光）的测序技术本质不同，Ion Torrent 摒弃了复杂的光学系统（激光、相机、酶标），通过密布于芯片上的 <strong>[[ISFET]]</strong>（离子敏场效应晶体管）传感器，直接检测 DNA 聚合过程中释放的 <strong>[[氢离子]] (<del class="diffchange diffchange-inline">$</del>H<del class="diffchange diffchange-inline">^</del>+<del class="diffchange diffchange-inline">$</del>)</strong> 引起的 pH 值变化来判读碱基序列。这一“将化学信号转化为数字信号”的机制，赋予了其测序速度快、仪器成本低的优势，但<strong>[[均聚物]] (Homopolymer)</strong> 测序误差是其主要的固有缺陷。</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> <strong>Ion Torrent</strong> 是全球首款商业化的基于<strong>[[半导体芯片]]</strong>技术的<strong>[[二代测序]] (NGS)</strong> 平台，由 Jonathan Rothberg 团队发明，现归属于 <strong>[[Thermo Fisher Scientific]]</strong>（赛默飞世尔）。与 Illumina 和 PacBio 等依赖光学信号（荧光）的测序技术本质不同，Ion Torrent 摒弃了复杂的光学系统（激光、相机、酶标），通过密布于芯片上的 <strong>[[ISFET]]</strong>（离子敏场效应晶体管）传感器，直接检测 DNA 聚合过程中释放的 <strong>[[氢离子]] (H<ins class="diffchange diffchange-inline"><sup></ins>+<ins class="diffchange diffchange-inline"></sup></ins>)</strong> 引起的 pH 值变化来判读碱基序列。这一“将化学信号转化为数字信号”的机制，赋予了其测序速度快、仪器成本低的优势，但<strong>[[均聚物]] (Homopolymer)</strong> 测序误差是其主要的固有缺陷。</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> </p></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> </p></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> </div></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> </div></div></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l28" >第28行：</td>
<td colspan="2" class="diff-lineno">第28行：</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <tr></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <tr></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0; width: 40%;">核心原理</th></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0; width: 40%;">核心原理</th></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">检测 <del class="diffchange diffchange-inline">$</del>H<del class="diffchange diffchange-inline">^</del>+<del class="diffchange diffchange-inline">$ </del>(pH变化)</td></div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">检测 H<ins class="diffchange diffchange-inline"><sup></ins>+<ins class="diffchange diffchange-inline"></sup> </ins>(pH变化)</td></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> </tr></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> </tr></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <tr></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <tr></div></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l71" >第71行：</td>
<td colspan="2" class="diff-lineno">第71行：</td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> Ion Torrent 的核心理念是将测序视为一种“pH 计”的测量过程。其芯片结构类似于数码相机的 CMOS 传感器，但底层的像素点不是感光二极管，而是对离子敏感的 ISFET。</div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> Ion Torrent 的核心理念是将测序视为一种“pH 计”的测量过程。其芯片结构类似于数码相机的 CMOS 传感器，但底层的像素点不是感光二极管，而是对离子敏感的 ISFET。</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> </p></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> </p></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"></del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;"> </del></div></td><td colspan="2"> </td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <div style="background-color: #f0f9ff; border-left: 5px solid #1e40af; padding: 15px 20px; margin: 20px 0; border-radius: 4px;"></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <div style="background-color: #f0f9ff; border-left: 5px solid #1e40af; padding: 15px 20px; margin: 20px 0; border-radius: 4px;"></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <ul style="margin: 0; padding-left: 20px; color: #334155;"></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <ul style="margin: 0; padding-left: 20px; color: #334155;"></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> <li style="margin-bottom: <del class="diffchange diffchange-inline">8px</del>;"><strong>1. 生化反应：</strong> 当 DNA 聚合酶将一个核苷酸（dNTP）添加到生长链的 3' 末端时，会形成一个磷酸二酯键，并释放出一个焦磷酸基团（PPi）和一个<strong>氢离子 (<del class="diffchange diffchange-inline">$</del>H<del class="diffchange diffchange-inline">^</del>+<del class="diffchange diffchange-inline">$</del>)</strong>。</div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> <li style="margin-bottom: <ins class="diffchange diffchange-inline">12px</ins>;"><strong>1. 生化反应：</strong> 当 DNA 聚合酶将一个核苷酸（dNTP）添加到生长链的 3' 末端时，会形成一个磷酸二酯键，并释放出一个焦磷酸基团（PPi）和一个<strong>氢离子 (H<ins class="diffchange diffchange-inline"><sup></ins>+<ins class="diffchange diffchange-inline"></sup></ins>)</strong>。</div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> <br><del class="diffchange diffchange-inline">$$ \</del>text<del class="diffchange diffchange-inline">{</del>DNA<del class="diffchange diffchange-inline">}_n </del>+ <del class="diffchange diffchange-inline">\text{</del>dNTP<del class="diffchange diffchange-inline">} \rightarrow \text{</del>DNA<del class="diffchange diffchange-inline">}_{</del>n+1<del class="diffchange diffchange-inline">} </del>+ <del class="diffchange diffchange-inline">\text{</del>PPi<del class="diffchange diffchange-inline">} </del>+ H<del class="diffchange diffchange-inline">^</del>+ <del class="diffchange diffchange-inline">$$</del></li></div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> <br></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> <li style="margin-bottom: <del class="diffchange diffchange-inline">8px</del>;"><strong>2. 信号检测：</strong> 芯片上的微孔（Well）底部是 ISFET 传感器。释放的 <del class="diffchange diffchange-inline">$</del>H<del class="diffchange diffchange-inline">^</del>+<del class="diffchange diffchange-inline">$ </del>导致微孔内的 pH 值发生微小变化（通常 <del class="diffchange diffchange-inline">$\Delta pH \approx </del>0.02<del class="diffchange diffchange-inline">$</del>），这一化学信号被 ISFET 瞬间转化为电压信号 <del class="diffchange diffchange-inline">$\Delta V$</del>。</li></div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline"> <div style="margin: 8px 0; font-family: 'Times New Roman', serif; font-weight: bold; </ins>text<ins class="diffchange diffchange-inline">-align: center;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline"> </ins>DNA<ins class="diffchange diffchange-inline"><sub>n</sub> </ins>+ dNTP <ins class="diffchange diffchange-inline">→ </ins>DNA<ins class="diffchange diffchange-inline"><sub></ins>n+1<ins class="diffchange diffchange-inline"></sub> </ins>+ PPi + H<ins class="diffchange diffchange-inline"><sup></ins>+<ins class="diffchange diffchange-inline"></sup></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline"> </div></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline"> </ins></li></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> <li style="margin-bottom: <ins class="diffchange diffchange-inline">12px</ins>;"><strong>2. 信号检测：</strong> 芯片上的微孔（Well）底部是 ISFET 传感器。释放的 H<ins class="diffchange diffchange-inline"><sup></ins>+<ins class="diffchange diffchange-inline"></sup> </ins>导致微孔内的 pH 值发生微小变化（通常 <ins class="diffchange diffchange-inline"><strong>ΔpH ≈ </ins>0.02<ins class="diffchange diffchange-inline"></strong></ins>），这一化学信号被 ISFET 瞬间转化为电压信号 <ins class="diffchange diffchange-inline"><strong>ΔV</strong></ins>。</li></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <li style="margin-bottom: 0;"><strong>3. 序列判读：</strong> 测序仪按顺序依次向流动池中通入 A、C、G、T 四种 dNTP。如果电压发生跳变，说明有碱基掺入；如果没有变化，说明不匹配。</li></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <li style="margin-bottom: 0;"><strong>3. 序列判读：</strong> 测序仪按顺序依次向流动池中通入 A、C、G、T 四种 dNTP。如果电压发生跳变，说明有碱基掺入；如果没有变化，说明不匹配。</li></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> </ul></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> </ul></div></td></tr>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> </ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"> </ins></div></td></tr>
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<td colspan="2" class="diff-lineno">第107行：</td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">双碱基 (AA)</td></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">双碱基 (AA)</td></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 10px; border: 1px solid #cbd5e1;">一次性掺入两个 A，释放两倍 <del class="diffchange diffchange-inline">$</del>H<del class="diffchange diffchange-inline">^</del>+<del class="diffchange diffchange-inline">$</del>，产生 2x 电压。</td></div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 10px; border: 1px solid #cbd5e1;">一次性掺入两个 A，释放两倍 H<ins class="diffchange diffchange-inline"><sup></ins>+<ins class="diffchange diffchange-inline"></sup></ins>，产生 2x 电压。</td></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 10px; border: 1px solid #cbd5e1;">准确读出 "AA"。</td></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 10px; border: 1px solid #cbd5e1;">准确读出 "AA"。</td></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> </tr></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> </tr></div></td></tr>
</table>
77921020
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2026-02-04T00:17:23Z
<p>建立内容为“<div style="padding: 0 4%; line-height: 1.8; color: #1e293b; font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', Arial, sans-serif; background-color: #ffffff…”的新页面</p>
<p><b>新页面</b></p><div><div style="padding: 0 4%; line-height: 1.8; color: #1e293b; font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', Arial, sans-serif; background-color: #ffffff; max-width: 1200px; margin: auto;"><br />
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<strong>Ion Torrent</strong> 是全球首款商业化的基于<strong>[[半导体芯片]]</strong>技术的<strong>[[二代测序]] (NGS)</strong> 平台，由 Jonathan Rothberg 团队发明，现归属于 <strong>[[Thermo Fisher Scientific]]</strong>（赛默飞世尔）。与 Illumina 和 PacBio 等依赖光学信号（荧光）的测序技术本质不同，Ion Torrent 摒弃了复杂的光学系统（激光、相机、酶标），通过密布于芯片上的 <strong>[[ISFET]]</strong>（离子敏场效应晶体管）传感器，直接检测 DNA 聚合过程中释放的 <strong>[[氢离子]] ($H^+$)</strong> 引起的 pH 值变化来判读碱基序列。这一“将化学信号转化为数字信号”的机制，赋予了其测序速度快、仪器成本低的优势，但<strong>[[均聚物]] (Homopolymer)</strong> 测序误差是其主要的固有缺陷。<br />
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<div style="font-size: 1.2em; font-weight: bold; letter-spacing: 1.2px;">Ion Torrent</div><br />
<div style="font-size: 0.7em; opacity: 0.85; margin-top: 4px; white-space: nowrap;">半导体测序技术 (点击展开)</div><br />
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<div style="font-size: 0.8em; color: #64748b; margin-top: 12px; font-weight: 600;">连接微电子与生物学的桥梁</div><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0; width: 40%;">核心原理</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">检测 $H^+$ (pH变化)</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">关键组件</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">[[ISFET]] 传感器</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">核苷酸</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #16a34a;">天然 dNTP (无标记)</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">发明者</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">Jonathan Rothberg</td><br />
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<th colspan="2" style="padding: 8px 12px; background-color: #e0f2fe; color: #1e40af; text-align: left; font-size: 0.9em; border-top: 1px solid #bae6fd;">应用与性能</th><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">代表机型</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">Ion GeneStudio S5</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">最大优势</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">速度快 (2-4小时)</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">核心缺陷</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #e11d48;">[[Indel]] 错误率高</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569;">临床应用</th><br />
<td style="padding: 6px 12px; color: #1e40af;">[[Oncomine]] (肿瘤靶向)</td><br />
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Ion Torrent 的核心理念是将测序视为一种“pH 计”的测量过程。其芯片结构类似于数码相机的 CMOS 传感器，但底层的像素点不是感光二极管，而是对离子敏感的 ISFET。<br />
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<li style="margin-bottom: 8px;"><strong>1. 生化反应：</strong> 当 DNA 聚合酶将一个核苷酸（dNTP）添加到生长链的 3' 末端时，会形成一个磷酸二酯键，并释放出一个焦磷酸基团（PPi）和一个<strong>氢离子 ($H^+$)</strong>。<br />
<br>$$ \text{DNA}_n + \text{dNTP} \rightarrow \text{DNA}_{n+1} + \text{PPi} + H^+ $$</li><br />
<li style="margin-bottom: 8px;"><strong>2. 信号检测：</strong> 芯片上的微孔（Well）底部是 ISFET 传感器。释放的 $H^+$ 导致微孔内的 pH 值发生微小变化（通常 $\Delta pH \approx 0.02$），这一化学信号被 ISFET 瞬间转化为电压信号 $\Delta V$。</li><br />
<li style="margin-bottom: 0;"><strong>3. 序列判读：</strong> 测序仪按顺序依次向流动池中通入 A、C、G、T 四种 dNTP。如果电压发生跳变，说明有碱基掺入；如果没有变化，说明不匹配。</li><br />
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<h2 style="background: #f1f5f9; color: #0f172a; padding: 10px 18px; border-radius: 0 6px 6px 0; font-size: 1.25em; margin-top: 40px; border-left: 6px solid #0f172a; font-weight: bold;">技术瓶颈：均聚物的噩梦</h2><br />
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Ion Torrent 最大的技术挑战在于处理<strong>[[均聚物]] (Homopolymer)</strong>，即连续相同的碱基序列（如 AAAAA）。<br />
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<th style="padding: 12px; border: 1px solid #cbd5e1; color: #0f172a; width: 25%;">现象</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #1e40af; width: 35%;">信号表现</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #475569; width: 40%;">结果</th><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">单碱基 (A)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">产生标准电压脉冲 (1x Voltage)。</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">准确读出 "A"。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">双碱基 (AA)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">一次性掺入两个 A，释放两倍 $H^+$，产生 2x 电压。</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">准确读出 "AA"。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">长均聚物 (AAAAAA)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">信号强度线性增加，但信噪比下降。</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;"><strong>难以区分</strong> 6个A 和 7个A 的电压微小差异。导致插入/缺失错误 (<strong>[[Indel]]</strong>)。</td><br />
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<strong>对比：</strong> Illumina 使用<strong>[[可逆终止子]]</strong>，强制每次只延伸一个碱基，因此不存在均聚物问题；而 Ion Torrent 使用天然 dNTP，无法物理阻断连续延伸。<br />
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<h2 style="background: #f1f5f9; color: #0f172a; padding: 10px 18px; border-radius: 0 6px 6px 0; font-size: 1.25em; margin-top: 40px; border-left: 6px solid #0f172a; font-weight: bold;">临床应用：唯快不破</h2><br />
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尽管存在 Indel 缺陷，Ion Torrent 在临床特定领域（特别是肿瘤伴随诊断）仍占有一席之地：<br />
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● <strong>速度极快：</strong> 由于没有光学扫描和复杂的化学循环，测序时间仅需 2-4 小时（Illumina 通常需 20+ 小时）。这对急需用药指导的晚期癌症患者至关重要。<br />
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● <strong>Oncomine 解决方案：</strong> Thermo Fisher 围绕 Ion Torrent 打造了强大的 <strong>[[Oncomine]]</strong> 试剂盒生态，是 FDA 批准的首个 NGS 伴随诊断产品，广泛用于检测 EGFR, BRAF, ALK 等靶点。<br />
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● <strong>样本量灵活：</strong> 芯片通量设计灵活，更适合医院内部（In-hospital）的小批量样本检测，无需凑样。<br />
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<span style="color: #0f172a; font-weight: bold; font-size: 1.05em; display: inline-block; margin-bottom: 15px;">学术参考文献 [Academic Review]</span><br />
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[1] <strong>Rothberg JM, et al. (2011).</strong> <em>An integrated semiconductor device enabling non-optical genome sequencing.</em> <strong>[[Nature]]</strong>. <br><br />
<span style="color: #475569;">[点评]：Ion Torrent 的奠基之作。Jonathan Rothberg 继 454 测序后再次登上 Nature 封面，证明了半导体技术与生物学的完美融合。</span><br />
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[2] <strong>Merriman B, et al. (2012).</strong> <em>Progress in Ion Torrent semiconductor chip based sequencing.</em> <strong>[[Electrophoresis]]</strong>. <br><br />
<span style="color: #475569;">[点评]：详细讨论了 Ion Torrent 芯片的迭代升级（从 314 到 318 芯片），以及针对均聚物误差的算法改进。</span><br />
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[3] <strong>Loman NJ, et al. (2012).</strong> <em>Performance comparison of benchtop high-throughput sequencing platforms.</em> <strong>[[Nature Biotechnology]]</strong>. <br><br />
<span style="color: #475569;">[点评]：早期的第三方评测，对比了 MiSeq (Illumina) 和 PGM (Ion Torrent)，指出了 Ion Torrent 在 Indel 错误率上的劣势和在速度上的优势。</span><br />
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测序技术分支 · 知识图谱<br />
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<td style="width: 85px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">上级技术</td><br />
<td style="padding: 10px 15px; color: #334155;">[[二代测序]] (NGS) • [[SBS]] (非荧光)</td><br />
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<td style="width: 85px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">核心硬件</td><br />
<td style="padding: 10px 15px; color: #334155;">[[ISFET]] • CMOS 芯片 • 乳液PCR (EmPCR)</td><br />
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<td style="width: 85px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">竞品对比</td><br />
<td style="padding: 10px 15px; color: #334155;">vs [[Illumina]] (更准但慢) • vs [[华大智造]] (更便宜)</td><br />
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