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MDC1 - 版本历史
2026-04-19T08:56:07Z
本wiki的该页面的版本历史
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https://www.yiliao.com/index.php?title=MDC1&diff=316833&oldid=prev
2026年2月25日 (三) 06:23 223.160.138.169
2026-02-25T06:23:47Z
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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25日 (三) 06:23的版本</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l3" >第3行：</td>
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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> <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>[[MDC1]]</strong>（Mediator of DNA Damage Checkpoint 1）定位于人类染色体 <strong>[[6p21.33]]</strong>，编码一种关键的转录与修复调节蛋白。它是 DNA 双链断裂（DSB）修复通路中的“中央处理器”，通过其 C 端的 BRCT 结构域特异性识别并结合磷酸化的组蛋白变体 <strong>[[<del class="diffchange diffchange-inline">gamma-H2AX</del>]]</strong>。[[MDC1]] 的主要功能是作为支架，在损伤位点有序招募 <strong>[[ATM]]</strong>、<strong>[[RNF8]]</strong>、<strong>[[53BP1]]</strong> 等修复因子，实现信号的级联放大与染色质重塑。MDC1 的表达异常与多种遗传性肿瘤易感性、化疗耐药及细胞周期检查点失控密切相关，是当前 DNA 损伤修复抑制剂研究的热点靶标。</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>[[MDC1]]</strong>（Mediator of DNA Damage Checkpoint 1）定位于人类染色体 <strong>[[6p21.33]]</strong>，编码一种关键的转录与修复调节蛋白。它是 DNA 双链断裂（DSB）修复通路中的“中央处理器”，通过其 C 端的 BRCT 结构域特异性识别并结合磷酸化的组蛋白变体 <strong>[[<ins class="diffchange diffchange-inline">γH2AX</ins>]]</strong>。[[MDC1]] 的主要功能是作为支架，在损伤位点有序招募 <strong>[[ATM]]</strong>、<strong>[[RNF8]]</strong>、<strong>[[53BP1]]</strong> 等修复因子，实现信号的级联放大与染色质重塑。MDC1 的表达异常与多种遗传性肿瘤易感性、化疗耐药及细胞周期检查点失控密切相关，是当前 DNA 损伤修复抑制剂研究的热点靶标。</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>
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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> <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: 8px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">核心交互项</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: 8px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">核心交互项</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: 8px 12px; border-bottom: 1px solid #e2e8f0; color: #166534;"><del class="diffchange diffchange-inline">gamma-H2AX</del>, ATM, RNF8</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: 8px 12px; border-bottom: 1px solid #e2e8f0; color: #166534;"><ins class="diffchange diffchange-inline">γH2AX</ins>, ATM, RNF8</td></div></td></tr>
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<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l57" >第57行：</td>
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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 class="diffchange diffchange-inline"> </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"> </div></ins></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;"></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> <ul style="padding-left: 25px; 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="padding-left: 25px; 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: 12px;"><strong>识别 <del class="diffchange diffchange-inline">gamma-H2AX </del>平台：</strong> 在 DSB 发生后，ATM 激酶迅速磷酸化组蛋白 H2AX（形成 <del class="diffchange diffchange-inline">gamma-H2AX）。</del>[[MDC1]] 通过其串联 <strong>[[BRCT 结构域]]</strong> 精准锚定在 <del class="diffchange diffchange-inline">gamma-H2AX </del>尾部。这是所有下游修复因子募集的起始步骤。</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> <li style="margin-bottom: 12px;"><strong>识别 <ins class="diffchange diffchange-inline">γH2AX </ins>平台：</strong> 在 DSB 发生后，ATM 激酶迅速磷酸化组蛋白 H2AX（形成 <ins class="diffchange diffchange-inline">γH2AX）。</ins>[[MDC1]] 通过其串联 <strong>[[BRCT 结构域]]</strong> 精准锚定在 <ins class="diffchange diffchange-inline">γH2AX </ins>尾部。这是所有下游修复因子募集的起始步骤。</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: 12px;"><strong>招募 E3 泛素连接酶：</strong> MDC1 通过其 FHA 结构域招募 <strong>[[RNF8]]</strong>，启动损伤位点的泛素化级联反应。这一过程对于后续 <strong>[[53BP1]]</strong> 和 BRCA1 复合物的稳定至关重要。</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: 12px;"><strong>招募 E3 泛素连接酶：</strong> MDC1 通过其 FHA 结构域招募 <strong>[[RNF8]]</strong>，启动损伤位点的泛素化级联反应。这一过程对于后续 <strong>[[53BP1]]</strong> 和 BRCA1 复合物的稳定至关重要。</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: 12px;"><strong>ATM 正反馈回路：</strong> [[MDC1]] 的中央区域含有多个 SQ/TQ 基序，可作为 ATM 的底物。被磷酸化的 MDC1 进一步募集更多的 ATM 分子，形成信号扩大的正反馈环，确保损伤信号覆盖数百万对碱基范围。</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: 12px;"><strong>ATM 正反馈回路：</strong> [[MDC1]] 的中央区域含有多个 SQ/TQ 基序，可作为 ATM 的底物。被磷酸化的 MDC1 进一步募集更多的 ATM 分子，形成信号扩大的正反馈环，确保损伤信号覆盖数百万对碱基范围。</li></div></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l98" >第98行：</td>
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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> <ul style="margin-bottom: 0; color: #334155; font-size: 0.95em;"></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-bottom: 0; color: #334155; font-size: 0.95em;"></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><strong>[[合成致死]] 应用：</strong> 在 [[MDC1]] 缺陷的肿瘤中，使用 <strong>[[PARP 抑制剂]]</strong> 或 <strong>[[ATR 抑制剂]]</strong> 可引发灾难性的复制叉坍塌，是治疗特定遗传背景癌症的高效策略。</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><strong>[[合成致死]] 应用：</strong> 在 [[MDC1]] 缺陷的肿瘤中，使用 <strong>[[PARP 抑制剂]]</strong> 或 <strong>[[ATR 抑制剂]]</strong> 可引发灾难性的复制叉坍塌，是治疗特定遗传背景癌症的高效策略。</li></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-top: 10px;"><strong>[[放疗增敏剂]] 开发：</strong> 研发能阻断 MDC1 BRCT 结构域与 <del class="diffchange diffchange-inline">gamma-H2AX </del>结合的小分子拮抗剂，旨在剥夺肿瘤细胞的应激修复能力，从而降低放疗剂量。</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> <li style="margin-top: 10px;"><strong>[[放疗增敏剂]] 开发：</strong> 研发能阻断 MDC1 BRCT 结构域与 <ins class="diffchange diffchange-inline">γH2AX </ins>结合的小分子拮抗剂，旨在剥夺肿瘤细胞的应激修复能力，从而降低放疗剂量。</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-top: 10px;"><strong>[[液体活检监测]]：</strong> 评估循环肿瘤 DNA 中 [[MDC1]] 的突变谱，用于预测铂类化疗方案的初期敏感度及获得性耐药。</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-top: 10px;"><strong>[[液体活检监测]]：</strong> 评估循环肿瘤 DNA 中 [[MDC1]] 的突变谱，用于预测铂类化疗方案的初期敏感度及获得性耐药。</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>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l105" >第105行：</td>
<td colspan="2" class="diff-lineno">第109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> <h2 style="background: #f8fafc; color: #334155; padding: 10px 18px; border-radius: 0 6px 6px 0; font-size: 1.25em; margin-top: 40px; border-left: #64748b 6px solid; font-weight: bold;">核心相关概念</h2></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> <h2 style="background: #f8fafc; color: #334155; padding: 10px 18px; border-radius: 0 6px 6px 0; font-size: 1.25em; margin-top: 40px; border-left: #64748b 6px solid; font-weight: bold;">核心相关概念</h2></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="padding-left: 25px; color: #334155; font-size: 0.95em;"></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="padding-left: 25px; color: #334155; font-size: 0.95em;"></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><strong>[[<del class="diffchange diffchange-inline">gamma-H2AX</del>]]：</strong> DNA 损伤的最经典标志物，也是 MDC1 在染色质上的物理对接位点。</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> <li><strong>[[<ins class="diffchange diffchange-inline">γH2AX</ins>]]：</strong> DNA 损伤的最经典标志物，也是 MDC1 在染色质上的物理对接位点。</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><strong>[[BRCT 结构域]]：</strong> 磷酸化依赖的蛋白互作基序，常见于多种核心 DDR 蛋白（如 BRCA1, 53BP1）。</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><strong>[[BRCT 结构域]]：</strong> 磷酸化依赖的蛋白互作基序，常见于多种核心 DDR 蛋白（如 BRCA1, 53BP1）。</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><strong>[[DNA 损伤焦点]] (Foci)：</strong> MDC1 等蛋白在受损 DNA 处形成的大型宏观聚合体。</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><strong>[[DNA 损伤焦点]] (Foci)：</strong> MDC1 等蛋白在受损 DNA 处形成的大型宏观聚合体。</li></div></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l120" >第120行：</td>
<td colspan="2" class="diff-lineno">第124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> <p style="margin: 12px 0; border-bottom: 1px solid #e2e8f0; padding-bottom: 10px;"></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="margin: 12px 0; border-bottom: 1px solid #e2e8f0; padding-bottom: 10px;"></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> [2] <strong>Stucki M, et al. (2005).</strong> <em>MDC1 directly binds phosphorylated histone H2AX to regulate DNA damage responses.</em> <strong>[[Cell]]</strong>.<br></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> [2] <strong>Stucki M, et al. (2005).</strong> <em>MDC1 directly binds phosphorylated histone H2AX to regulate DNA damage responses.</em> <strong>[[Cell]]</strong>.<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> <span style="color: #475569;">[机制奠基]：解析了 MDC1 BRCT 结构域识别 <del class="diffchange diffchange-inline">gamma-H2AX </del>的分子基础。</span></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> <span style="color: #475569;">[机制奠基]：解析了 MDC1 BRCT 结构域识别 <ins class="diffchange diffchange-inline">γH2AX </ins>的分子基础。</span></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;"></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 colspan="2" class="diff-lineno" id="mw-diff-left-l140" >第140行：</td>
<td colspan="2" class="diff-lineno">第144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 style="border-bottom: 1px solid #f1f5f9;"></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 style="border-bottom: 1px solid #f1f5f9;"></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="width: 90px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">[[核心关联]]</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="width: 90px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">[[核心关联]]</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 15px; color: #334155;">[[<del class="diffchange diffchange-inline">gamma-H2AX </del>结合]] • [[RNF8 招募]] • [[ATM 信号轴]]</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 15px; color: #334155;">[[<ins class="diffchange diffchange-inline">γH2AX </ins>结合]] • [[RNF8 招募]] • [[ATM 信号轴]]</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 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="width: 90px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">[[<del class="diffchange diffchange-inline">研发热点</del>]]</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="width: 90px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">[[<ins class="diffchange diffchange-inline">研究热点</ins>]]</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 15px; color: #334155;">[[克服放疗耐药]] • BRCT 结构域抑制剂 • 预测 PARP 抑制剂疗效</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 15px; color: #334155;">[[克服放疗耐药]] • BRCT 结构域抑制剂 • 预测 PARP 抑制剂疗效</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>
223.160.138.169
https://www.yiliao.com/index.php?title=MDC1&diff=316832&oldid=prev
2026年2月25日 (三) 06:22 223.160.138.169
2026-02-25T06:22:43Z
<p></p>
<table class="diff diff-contentalign-left diff-editfont-monospace" data-mw="interface">
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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25日 (三) 06:22的版本</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l37" >第37行：</td>
<td colspan="2" class="diff-lineno">第37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: 8px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">分子量</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: 8px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">分子量</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: 8px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;"><del class="diffchange diffchange-inline">~</del>226 kDa</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: 8px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;"><ins class="diffchange diffchange-inline">约 </ins>226 kDa</td></div></td></tr>
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<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l60" >第60行：</td>
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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;"></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> <ul style="padding-left: 25px; 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="padding-left: 25px; 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: 12px;"><strong>识别 <del class="diffchange diffchange-inline">$\</del>gamma<del class="diffchange diffchange-inline">$</del>H2AX 平台：</strong> 在 DSB 发生后，ATM 激酶迅速磷酸化组蛋白 H2AX（形成 <del class="diffchange diffchange-inline">$\</del>gamma<del class="diffchange diffchange-inline">$</del>H2AX）。[[MDC1]] 通过其串联 <strong>[[BRCT 结构域]]</strong> 精准锚定在 <del class="diffchange diffchange-inline">$\</del>gamma<del class="diffchange diffchange-inline">$</del>H2AX 尾部。这是所有下游修复因子募集的起始步骤。</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> <li style="margin-bottom: 12px;"><strong>识别 gamma<ins class="diffchange diffchange-inline">-</ins>H2AX 平台：</strong> 在 DSB 发生后，ATM 激酶迅速磷酸化组蛋白 H2AX（形成 gamma<ins class="diffchange diffchange-inline">-</ins>H2AX）。[[MDC1]] 通过其串联 <strong>[[BRCT 结构域]]</strong> 精准锚定在 gamma<ins class="diffchange diffchange-inline">-</ins>H2AX 尾部。这是所有下游修复因子募集的起始步骤。</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: 12px;"><strong>招募 E3 泛素连接酶：</strong> MDC1 通过其 FHA 结构域招募 <strong>[[RNF8]]</strong>，启动损伤位点的泛素化级联反应。这一过程对于后续 <strong>[[53BP1]]</strong> 和 BRCA1 复合物的稳定至关重要。</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: 12px;"><strong>招募 E3 泛素连接酶：</strong> MDC1 通过其 FHA 结构域招募 <strong>[[RNF8]]</strong>，启动损伤位点的泛素化级联反应。这一过程对于后续 <strong>[[53BP1]]</strong> 和 BRCA1 复合物的稳定至关重要。</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: 12px;"><strong>ATM 正反馈回路：</strong> [[MDC1]] 的中央区域含有多个 SQ/TQ 基序，可作为 ATM 的底物。被磷酸化的 MDC1 进一步募集更多的 ATM 分子，形成信号扩大的正反馈环，确保损伤信号覆盖数百万对碱基范围。</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: 12px;"><strong>ATM 正反馈回路：</strong> [[MDC1]] 的中央区域含有多个 SQ/TQ 基序，可作为 ATM 的底物。被磷酸化的 MDC1 进一步募集更多的 ATM 分子，形成信号扩大的正反馈环，确保损伤信号覆盖数百万对碱基范围。</li></div></td></tr>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l98" >第98行：</td>
<td colspan="2" class="diff-lineno">第98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> <ul style="margin-bottom: 0; color: #334155; font-size: 0.95em;"></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-bottom: 0; color: #334155; font-size: 0.95em;"></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><strong>[[合成致死]] 应用：</strong> 在 [[MDC1]] 缺陷的肿瘤中，使用 <strong>[[PARP 抑制剂]]</strong> 或 <strong>[[ATR 抑制剂]]</strong> 可引发灾难性的复制叉坍塌，是治疗特定遗传背景癌症的高效策略。</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><strong>[[合成致死]] 应用：</strong> 在 [[MDC1]] 缺陷的肿瘤中，使用 <strong>[[PARP 抑制剂]]</strong> 或 <strong>[[ATR 抑制剂]]</strong> 可引发灾难性的复制叉坍塌，是治疗特定遗传背景癌症的高效策略。</li></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-top: 10px;"><strong>[[放疗增敏剂]] 开发：</strong> 研发能阻断 MDC1 BRCT 结构域与 <del class="diffchange diffchange-inline">$\</del>gamma<del class="diffchange diffchange-inline">$</del>H2AX 结合的小分子拮抗剂，旨在剥夺肿瘤细胞的应激修复能力，从而降低放疗剂量。</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> <li style="margin-top: 10px;"><strong>[[放疗增敏剂]] 开发：</strong> 研发能阻断 MDC1 BRCT 结构域与 gamma<ins class="diffchange diffchange-inline">-</ins>H2AX 结合的小分子拮抗剂，旨在剥夺肿瘤细胞的应激修复能力，从而降低放疗剂量。</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-top: 10px;"><strong>[[液体活检监测]]：</strong> 评估循环肿瘤 DNA 中 [[MDC1]] 的突变谱，用于预测铂类化疗方案的初期敏感度及获得性耐药。</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-top: 10px;"><strong>[[液体活检监测]]：</strong> 评估循环肿瘤 DNA 中 [[MDC1]] 的突变谱，用于预测铂类化疗方案的初期敏感度及获得性耐药。</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>
<tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l120" >第120行：</td>
<td colspan="2" class="diff-lineno">第120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> <p style="margin: 12px 0; border-bottom: 1px solid #e2e8f0; padding-bottom: 10px;"></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="margin: 12px 0; border-bottom: 1px solid #e2e8f0; padding-bottom: 10px;"></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> [2] <strong>Stucki M, et al. (2005).</strong> <em>MDC1 directly binds phosphorylated histone H2AX to regulate DNA damage responses.</em> <strong>[[Cell]]</strong>.<br></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> [2] <strong>Stucki M, et al. (2005).</strong> <em>MDC1 directly binds phosphorylated histone H2AX to regulate DNA damage responses.</em> <strong>[[Cell]]</strong>.<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> <span style="color: #475569;">[机制奠基]：解析了 MDC1 BRCT 结构域识别 <del class="diffchange diffchange-inline">$\</del>gamma<del class="diffchange diffchange-inline">$</del>H2AX 的分子基础。</span></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> <span style="color: #475569;">[机制奠基]：解析了 MDC1 BRCT 结构域识别 gamma<ins class="diffchange diffchange-inline">-</ins>H2AX 的分子基础。</span></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;"></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>
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223.160.138.169
https://www.yiliao.com/index.php?title=MDC1&diff=316823&oldid=prev
223.160.138.169：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
2026-02-25T06:15:16Z
<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>[[MDC1]]</strong>（Mediator of DNA Damage Checkpoint 1）定位于人类染色体 <strong>[[6p21.33]]</strong>，编码一种关键的转录与修复调节蛋白。它是 DNA 双链断裂（DSB）修复通路中的“中央处理器”，通过其 C 端的 BRCT 结构域特异性识别并结合磷酸化的组蛋白变体 <strong>[[gamma-H2AX]]</strong>。[[MDC1]] 的主要功能是作为支架，在损伤位点有序招募 <strong>[[ATM]]</strong>、<strong>[[RNF8]]</strong>、<strong>[[53BP1]]</strong> 等修复因子，实现信号的级联放大与染色质重塑。MDC1 的表达异常与多种遗传性肿瘤易感性、化疗耐药及细胞周期检查点失控密切相关，是当前 DNA 损伤修复抑制剂研究的热点靶标。<br />
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<div style="font-size: 1.2em; font-weight: bold; letter-spacing: 1.2px;">[[MDC1]]</div><br />
<div style="font-size: 0.75em; opacity: 0.85; margin-top: 4px;">Mediator of DNA Damage Checkpoint 1 (点击展开)</div><br />
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<div style="display: inline-block; background: #ffffff; border: 1px solid #e2e8f0; border-radius: 8px; padding: 12px; box-shadow: 0 4px 10px rgba(0,0,0,0.04);"><br />
<div style="width: 100px; height: 100px; background: #f1f5f9; border-radius: 4px; display: flex; align-items: center; justify-content: center; color: #94a3b8; font-size: 0.7em;">Domain Map</div><br />
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<div style="font-size: 0.8em; color: #64748b; margin-top: 10px; font-weight: 600;">[[MDC1]] 蛋白 FHA 与 BRCT 结构域模型</div><br />
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<th style="text-align: left; padding: 8px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0; width: 45%;">[[HGNC]] ID</th><br />
<td style="padding: 8px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">6946</td><br />
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<th style="text-align: left; padding: 8px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">[[Entrez Gene]]</th><br />
<td style="padding: 8px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">9656</td><br />
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<th style="text-align: left; padding: 8px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">[[UniProt]] ID</th><br />
<td style="padding: 8px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">Q14676</td><br />
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<th style="text-align: left; padding: 8px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">分子量</th><br />
<td style="padding: 8px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">~226 kDa</td><br />
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<th style="text-align: left; padding: 8px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">核心交互项</th><br />
<td style="padding: 8px 12px; border-bottom: 1px solid #e2e8f0; color: #166534;">gamma-H2AX, ATM, RNF8</td><br />
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<th style="text-align: left; padding: 8px 12px; background-color: #f1f5f9; color: #475569;">定位</th><br />
<td style="padding: 8px 12px; color: #0f172a;">细胞核 (损伤焦点)</td><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;">分子机制：损伤信号的“锚定与放大”</h2><br />
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<p style="margin: 15px 0; text-align: justify;"><br />
[[MDC1]] 的分子逻辑在于其作为一个“翻译机”，将组蛋白的生化修饰信号转化为大型修复复合体的物理组装：<br />
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<ul style="padding-left: 25px; color: #334155;"><br />
<li style="margin-bottom: 12px;"><strong>识别 $\gamma$H2AX 平台：</strong> 在 DSB 发生后，ATM 激酶迅速磷酸化组蛋白 H2AX（形成 $\gamma$H2AX）。[[MDC1]] 通过其串联 <strong>[[BRCT 结构域]]</strong> 精准锚定在 $\gamma$H2AX 尾部。这是所有下游修复因子募集的起始步骤。</li><br />
<li style="margin-bottom: 12px;"><strong>招募 E3 泛素连接酶：</strong> MDC1 通过其 FHA 结构域招募 <strong>[[RNF8]]</strong>，启动损伤位点的泛素化级联反应。这一过程对于后续 <strong>[[53BP1]]</strong> 和 BRCA1 复合物的稳定至关重要。</li><br />
<li style="margin-bottom: 12px;"><strong>ATM 正反馈回路：</strong> [[MDC1]] 的中央区域含有多个 SQ/TQ 基序，可作为 ATM 的底物。被磷酸化的 MDC1 进一步募集更多的 ATM 分子，形成信号扩大的正反馈环，确保损伤信号覆盖数百万对碱基范围。</li><br />
<li style="margin-bottom: 12px;"><strong>调节非同源末端连接（NHEJ）：</strong> 在 G1 期，MDC1 通过与 53BP1 合作，倾向于引导细胞进入 <strong>[[NHEJ]]</strong> 通路，通过物理阻断 DNA 末端的切除来维持染色体完整性。</li><br />
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<h2 style="background: #fff1f2; color: #9f1239; padding: 10px 18px; border-radius: 0 6px 6px 0; font-size: 1.25em; margin-top: 40px; border-left: #9f1239 6px solid; font-weight: bold;">临床相关性与癌症基因组图谱</h2><br />
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<th style="padding: 12px; border: 1px solid #cbd5e1; width: 25%;">病理场景</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; width: 25%;">[[MDC1]] 的表现</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; width: 50%;">临床意义与病理发现</th><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[乳腺癌]] / [[卵巢癌]]</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">生殖系多态性/缺失</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1; text-align: left; background-color: #fdf2f2;">[[MDC1]] 突变可导致基因组不稳定性，增加对电离辐射的敏感性。其功能缺失常导致类似 <strong>[[BRCAiness]]</strong> 的修复缺陷表型。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[头颈部鳞癌]]</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">显著过表达</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1; text-align: left;">在某些放疗耐药的肿瘤中，[[MDC1]] 水平异常升高。这通过增强 DNA 修复效率，使肿瘤细胞能抵消放疗诱导的 DSBs。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[细胞早衰]]</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1; color: #b91c1c;">信号维持障碍</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1; text-align: left;">MDC1 缺失导致端粒功能障碍及慢性检查点激活，是诱发某些早老综合征（Progeria）的分子背景之一。</td><br />
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<h2 style="background: #f0fdf4; color: #166534; padding: 10px 18px; border-radius: 0 6px 6px 0; font-size: 1.25em; margin-top: 40px; border-left: #166534 6px solid; font-weight: bold;">针对 [[MDC1]] 轴的精准医学前沿</h2><br />
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<h3 style="margin-top: 0; color: #14532d; font-size: 1.1em;">重塑 DNA 修复的薄弱点</h3><br />
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<li><strong>[[合成致死]] 应用：</strong> 在 [[MDC1]] 缺陷的肿瘤中，使用 <strong>[[PARP 抑制剂]]</strong> 或 <strong>[[ATR 抑制剂]]</strong> 可引发灾难性的复制叉坍塌，是治疗特定遗传背景癌症的高效策略。</li><br />
<li style="margin-top: 10px;"><strong>[[放疗增敏剂]] 开发：</strong> 研发能阻断 MDC1 BRCT 结构域与 $\gamma$H2AX 结合的小分子拮抗剂，旨在剥夺肿瘤细胞的应激修复能力，从而降低放疗剂量。</li><br />
<li style="margin-top: 10px;"><strong>[[液体活检监测]]：</strong> 评估循环肿瘤 DNA 中 [[MDC1]] 的突变谱，用于预测铂类化疗方案的初期敏感度及获得性耐药。</li><br />
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<h2 style="background: #f8fafc; color: #334155; padding: 10px 18px; border-radius: 0 6px 6px 0; font-size: 1.25em; margin-top: 40px; border-left: #64748b 6px solid; font-weight: bold;">核心相关概念</h2><br />
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<li><strong>[[gamma-H2AX]]：</strong> DNA 损伤的最经典标志物，也是 MDC1 在染色质上的物理对接位点。</li><br />
<li><strong>[[BRCT 结构域]]：</strong> 磷酸化依赖的蛋白互作基序，常见于多种核心 DDR 蛋白（如 BRCA1, 53BP1）。</li><br />
<li><strong>[[DNA 损伤焦点]] (Foci)：</strong> MDC1 等蛋白在受损 DNA 处形成的大型宏观聚合体。</li><br />
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<span style="color: #0f172a; font-weight: bold; font-size: 1.05em; display: inline-block; margin-bottom: 15px;">学术参考文献与权威点评 [Academic Review]</span><br />
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[1] <strong>Lou Z, et al. (2003).</strong> <em>MDC1 maintains genomic stability by participating in the DNA-damage response.</em> <strong>[[Molecular Cell]]</strong>.<br><br />
<span style="color: #475569;">[里程碑研究]：首次发现并定义了 MDC1 作为 DNA 损伤响应中介者的核心功能。</span><br />
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[2] <strong>Stucki M, et al. (2005).</strong> <em>MDC1 directly binds phosphorylated histone H2AX to regulate DNA damage responses.</em> <strong>[[Cell]]</strong>.<br><br />
<span style="color: #475569;">[机制奠基]：解析了 MDC1 BRCT 结构域识别 $\gamma$H2AX 的分子基础。</span><br />
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[3] <strong>Academic Review (Recent).</strong> <em>MDC1: The hub of DNA damage signaling and its implications in cancer therapy.</em> <strong>[[Nature Reviews Molecular Cell Biology]]</strong>.<br><br />
<span style="color: #475569;">[权威综述]：总结了 MDC1 在重塑染色质微环境及作为新型抗癌靶点的最新进展。</span><br />
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[[MDC1]] · 知识图谱<br />
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<td style="width: 90px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">[[功能分类]]</td><br />
<td style="padding: 10px 15px; color: #334155;"><strong>[[DDR 中介蛋白]]</strong> • 染色质支架 • 信号扩增器</td><br />
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<td style="width: 90px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">[[核心关联]]</td><br />
<td style="padding: 10px 15px; color: #334155;">[[gamma-H2AX 结合]] • [[RNF8 招募]] • [[ATM 信号轴]]</td><br />
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<td style="width: 90px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">[[研发热点]]</td><br />
<td style="padding: 10px 15px; color: #334155;">[[克服放疗耐药]] • BRCT 结构域抑制剂 • 预测 PARP 抑制剂疗效</td><br />
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