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体细胞核移植 - 版本历史
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<strong>体细胞核移植</strong>（Somatic Cell Nuclear Transfer, SCNT）是指将供体体细胞的细胞核移入去核的卵母细胞中，使其在细胞质因子的诱导下发生[[表观遗传重编程]]，重新获得全能性并自发发育为[[囊胚]]的技术。SCNT 是克隆生物学与治疗性克隆的核心，为[[再生医学]]中定制患者特异性[[胚胎干细胞]]（NT-ESCs）提供了重要路径。<br />
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<div style="font-size: 1.25em; font-weight: bold; letter-spacing: 1px; text-decoration: none !important;">SCNT · 重编程技术</div><br />
<div style="font-size: 0.75em; opacity: 0.8; margin-top: 4px; white-space: nowrap; text-decoration: none !important;">Somatic Cell Nuclear Transfer (点击展开)</div><br />
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[[文件:SCNT_Process_Icon.png|120px|体细胞核移植工艺图]]<br />
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<div style="font-size: 0.85em; color: #64748b; margin-top: 15px; font-weight: 600;">微操作下的核移植技术示意</div><br />
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<td style="padding: 10px 18px; border-bottom: 1px solid #f1f5f9; color: #1e293b;">去核、注核、电融合、激活</td><br />
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<th style="text-align: left; padding: 10px 18px; border-bottom: 1px solid #f1f5f9; color: #64748b; font-weight: 600; background-color: #fcfdfe;">生物里程碑</th><br />
<td style="padding: 10px 18px; border-bottom: 1px solid #f1f5f9; color: #1e293b;">克隆羊多莉 (Dolly)</td><br />
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<th style="text-align: left; padding: 10px 18px; color: #64748b; font-weight: 600; background-color: #fcfdfe;">主要挑战</th><br />
<td style="padding: 10px 18px; color: #1e293b; font-weight: bold;">重编程效率低下 / 表观遗传缺陷</td><br />
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[Image of somatic cell nuclear transfer process]<br />
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体细胞核移植是一项精密显微操作技术，其成功依赖于对受体卵母细胞状态的精准掌控：<br />
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<li style="margin-bottom: 10px;"><strong>受体卵母细胞去核：</strong> 通常在减数分裂第二次中期（MII期）去除纺锤体-染色体复合物，为外源核腾出物理空间。</li><br />
<li style="margin-bottom: 10px;"><strong>供体核注入与融合：</strong> 利用电融合或灭活病毒将体细胞核送入卵子周隙。</li><br />
<li style="margin-bottom: 10px;"><strong>人工激活：</strong> 通过离子霉素或电脉冲模拟受精时的[[钙离子波动]]，重启动细胞周期。</li><br />
<li style="margin-bottom: 10px;"><strong>表观遗传重置：</strong> 细胞质因子开始清除体细胞的[[DNA甲基化]]及组蛋白修饰，将其强制推回全能性状态。</li><br />
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<h3 style="color: #1e40af; border-bottom: 2px solid #dbeafe; display: inline-block; padding-bottom: 3px; margin-top: 20px;">1. 治疗性克隆 (Therapeutic Cloning)</h3><br />
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通过 SCNT 技术获取与患者基因组完全一致的[[胚胎干细胞]]。相比于 [[iPSCs]]，SCNT 衍生的干细胞在表观遗传图谱上更接近天然胚胎，具有更低的免疫排斥风险和更高的分化潜能。<br />
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<h3 style="color: #1e40af; border-bottom: 2px solid #dbeafe; display: inline-block; padding-bottom: 3px; margin-top: 20px;">2. 疾病模型与机理研究</h3><br />
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<li style="margin-bottom: 8px;"><strong>精准建模：</strong> 利用患者皮肤细胞进行 SCNT，可建立高度仿真的人类疾病[[体外模型]]。</li><br />
<li style="margin-bottom: 8px;"><strong>线粒体替代：</strong> SCNT 是解决[[线粒体遗传病]]的重要技术储备。</li><br />
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<th style="padding: 12px; border: 1px solid #e2e8f0; color: #1e3a8a;">技术对比项</th><br />
<th style="padding: 12px; border: 1px solid #e2e8f0; color: #1e3a8a;">体细胞核移植 (SCNT)</th><br />
<th style="padding: 12px; border: 1px solid #e2e8f0; color: #1e3a8a;">诱导多能性 (iPSC)</th><br />
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<td style="padding: 10px; border: 1px solid #e2e8f0; background: #fcfdfe; font-weight: bold;">重编程介导</td><br />
<td style="padding: 10px; border: 1px solid #e2e8f0;">卵子细胞质因子</td><br />
<td style="padding: 10px; border: 1px solid #e2e8f0;">外源转录因子 (Oct4等)</td><br />
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<td style="padding: 10px; border: 1px solid #e2e8f0; background: #fcfdfe; font-weight: bold;">细胞来源</td><br />
<td style="padding: 10px; border: 1px solid #e2e8f0;">体细胞核 + 卵子</td><br />
<td style="padding: 10px; border: 1px solid #e2e8f0;">纯体细胞</td><br />
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<td style="padding: 10px; border: 1px solid #e2e8f0; background: #fcfdfe; font-weight: bold;">伦理争议</td><br />
<td style="padding: 10px; border: 1px solid #e2e8f0;">较高 (涉及卵子来源)</td><br />
<td style="padding: 10px; border: 1px solid #e2e8f0;">低</td><br />
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尽管 SCNT 展示了惊人的重编程能力，但其临床转化仍面临巨大挑战：<br />
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<li style="margin-bottom: 10px;"><strong>线粒体异质性：</strong> 供体核携带极少量体细胞线粒体，与受体卵子线粒体可能发生竞争或不兼容。</li><br />
<li style="margin-bottom: 10px;"><strong>印迹基因表达：</strong> SCNT 胚胎常出现[[印迹基因]]（Imprinted Genes）的异常表达，导致发育异常。</li><br />
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[1] Wilmut I, et al. "Viable offspring derived from fetal and adult mammalian cells." <em>Nature</em>. 1997. <br />
<span style="color: #64748b;">(点评：克隆羊“多莉”诞生的开山之作，彻底打破了体细胞不可逆分化的学术信条。)</span><br />
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[2] Gurdon JB. "The developmental capacity of nuclei taken from intestinal epithelium cells of feeding tadpoles." <em>J Embryol Exp Morphol</em>. 1962. <br />
<span style="color: #64748b;">(点评：诺贝尔奖获奖研究，证明了发育中的细胞核遗传信息具有全能性，是 SCNT 的理论基石。)</span><br />
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[3] Tachibana M, et al. "Human embryonic stem cells derived by somatic cell nuclear transfer." <em>Cell</em>. 2013. <br />
<span style="color: #64748b;">(点评：首次成功从人类体细胞核移植胚胎中获取胚胎干细胞，实现了治疗性克隆的关键性突破。)</span><br />
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<div style="background-color: #1e3a8a; color: #ffffff; text-align: center; font-weight: bold; padding: 12px; text-decoration: none !important;">SCNT 知识导航</div><br />
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[[治疗性克隆]] • [[表观遗传重编程]] • [[去核卵母细胞]] • [[线粒体替代疗法]] • [[胚胎干细胞]]<br />
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