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DROSHA - 版本历史
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<strong>DROSHA</strong>（Ribonuclease III），全称为 Drosha 核糖核酸酶 III，是真核生物 microRNA (miRNA) 生物合成途径中的起始酶。作为一种核内 <strong>[[RNase III]]</strong> 家族成员，DROSHA 与其核心辅因子 <strong>[[DGCR8]]</strong>（DiGeorge Syndrome Critical Region 8）共同组装成名为“<strong>微处理器</strong>” (Microprocessor) 的巨型蛋白复合物。该复合物负责在细胞核内精确识别并切割初级 miRNA 转录本 (<strong>[[pri-miRNA]]</strong>)，将其加工成发夹状的前体 miRNA (<strong>[[pre-miRNA]]</strong>)。DROSHA 的功能异常会导致全球性 miRNA 表达谱失调，在临床上与多种恶性肿瘤（特别是<strong>[[肾母细胞瘤]]</strong>）的发生密切相关。<br />
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<div style="font-size: 1.2em; font-weight: bold; letter-spacing: 1.2px;">DROSHA</div><br />
<div style="font-size: 0.7em; opacity: 0.85; margin-top: 4px; white-space: nowrap;">Nuclear RNase III (点击展开)</div><br />
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[[Image:Drosha_DGCR8_complex_structure.png|100px|Microprocessor复合物结构]]<br />
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<div style="font-size: 0.8em; color: #64748b; margin-top: 12px; font-weight: 600;">miRNA 生物合成起始</div><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0; width: 40%;">基因符号</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">DROSHA</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">别名</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">RNASEN, RN3</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">染色体位置</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">5p13.2</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">Entrez Gene</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">29102</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">UniProt ID</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">Q9NRR4</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">OMIM 编号</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">605988</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">酶类别</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">核糖核酸内切酶</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">氨基酸数</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #b91c1c;"><strong>1374 aa</strong></td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">分子量</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">159.3 kDa</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">辅因子</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;"><strong>Mg2+</strong>, DGCR8</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569;">临床意义</th><br />
<td style="padding: 6px 12px; color: #b91c1c;">肾母细胞瘤, 肿瘤发生</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：微处理器的“分子尺”</h2><br />
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DROSHA 在细胞核中执行其功能，它是 miRNA 生成过程的“看门人”。<br />
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<li style="margin-bottom: 12px;"><strong>复合物组装 (The Microprocessor)：</strong><br />
<br>DROSHA 自身缺乏对 RNA 底物的精确识别能力，必须结合辅因子 <strong>[[DGCR8]]</strong>。DGCR8 通过其 RNA 结合域识别 pri-miRNA 的 ssRNA-dsRNA 交界处，作为“分子尺”辅助 DROSHA 定位切割位点。</li><br />
<li style="margin-bottom: 12px;"><strong>双催化中心切割 (Dual Catalytic Center Cleavage)：</strong><br />
<br>DROSHA 拥有两个串联的 <strong>RNase III 结构域</strong> (RIIIDa 和 RIIIDb)。这两个结构域形成一个分子内二聚体，分别切割 RNA 发夹结构的 3' 臂和 5' 臂。这种交错切割产生具有 2nt 3' 突出端的 <strong>[[pre-miRNA]]</strong>，这是后续被 [[Exportin-5]] 识别并转运出核的关键特征。</li><br />
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[[Image:Pri-miRNA_processing_by_Drosha_DGCR8.png|100px|Microprocessor 切割 pri-miRNA 的机制]]<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: 6px solid #9f1239; font-weight: bold;">临床警示：肾母细胞瘤的关键驱动者</h2><br />
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<h3 style="margin-top: 0; color: #be123c; font-size: 1.1em;">突变热点与 miRNA 缺陷</h3><br />
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DROSHA 突变在儿童<strong>[[肾母细胞瘤]]</strong> (Wilms Tumor) 中高度富集，约 12% 的病例携带该基因突变。<br />
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<strong>金属离子结合位点突变：</strong><br><br />
最常见的体细胞突变发生在 RNase IIIb 结构域中保守的金属离子结合残基（如 <strong>E1147K</strong>）。这种突变是一个显性负效应突变 (Dominant-negative)，它破坏了 DROSHA 结合 Mg2+ 的能力，导致酶活性丧失。<br />
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<strong>后果：</strong> miRNA 生物合成的广泛受阻，特别是肿瘤抑制性 miRNA（如 let-7家族）的表达下调。这导致癌基因（如 [[MYCN]], [[IGF2]]）过表达，驱动未分化肾元前体细胞的恶性转化。<br />
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<th style="padding: 12px; border: 1px solid #cbd5e1; color: #0f172a; width: 25%;">疾病类型</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #475569;">变异形式</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #1e40af;">临床效应 / 机制</th><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[肾母细胞瘤]]</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">错义突变 (E1147K 等)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">RNase IIIb 结构域失活，导致全局性 miRNA 生成受损，驱动肿瘤发生。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[乳腺癌]]</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">表达下调 / 拷贝数丢失</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">DROSHA 低表达与肿瘤侵袭性增加、预后不良及转移风险升高相关。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">[[肺癌]]</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">表达水平异常</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">DROSHA 表达水平可作为预后标志物，低表达通常预示生存期缩短。</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;">治疗策略与前景</h2><br />
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目前尚无直接靶向 DROSHA 酶活性的临床药物，但针对 DROSHA 功能缺失导致的 miRNA 缺陷是研究热点。<br />
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<li style="margin-bottom: 12px;"><strong>miRNA 替代疗法 (miRNA Replacement)：</strong><br />
<br>对于 DROSHA 突变的肿瘤，通过导入合成的 <strong>miRNA mimics</strong>（如 [[let-7]] 模拟物）来恢复抑癌功能，绕过上游的加工缺陷。</li><br />
<li style="margin-bottom: 12px;"><strong>非经典功能靶向：</strong><br />
<br>DROSHA 还具有不依赖 miRNA 的功能（如维持基因组稳定性、抗病毒防御）。研究其在 DNA 损伤反应中的角色可能提供新的合成致死靶点。</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</span><br />
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[1] <strong>Lee Y, Ahn C, Han J, et al. (2003).</strong> <em>The nuclear RNase III Drosha initiates microRNA processing.</em> <strong>[[Nature]]</strong>. 2003;425(6956):415-419.<br><br />
<span style="color: #475569;">[学术点评]：发现之源。Kim 实验室的开创性工作，首次鉴定 DROSHA 为初级 miRNA 的核心加工酶，定义了 miRNA 生物合成的核内步骤。</span><br />
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[2] <strong>Walz AL, Ooms A, Gadd S, et al. (2015).</strong> <em>Recurrent DGCR8, DROSHA, and SIX homeodomain mutations in favorable histology Wilms tumors.</em> <strong>[[Cancer Cell]]</strong>. 2015;27(2):286-297.<br><br />
<span style="color: #475569;">[学术点评]：临床突破。利用全基因组测序在肾母细胞瘤中发现了复发性的 DROSHA 和 DGCR8 热点突变，揭示了 miRNA 加工缺陷在该肿瘤发生中的驱动作用。</span><br />
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[3] <strong>Han J, Lee Y, Yeom KH, et al. (2004).</strong> <em>The Drosha-DGCR8 complex in primary microRNA processing.</em> <strong>[[Genes & Development]]</strong>. 2004;18(24):3016-3027.<br><br />
<span style="color: #475569;">[学术点评]：机制解析。阐明了 Microprocessor 复合物的构成，确立了 DGCR8 作为分子尺辅助 DROSHA 精确切割底物的分子机制。</span><br />
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DROSHA · 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; white-space: nowrap;">黄金搭档</td><br />
<td style="padding: 10px 15px; color: #334155;">[[DGCR8]] (Microprocessor) • [[p68]] (DDX5) • [[p72]]</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; white-space: nowrap;">上下游</td><br />
<td style="padding: 10px 15px; color: #334155;">底物: [[pri-miRNA]] • 产物: [[pre-miRNA]] • 接力: [[Exportin-5]] / [[DICER]]</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; white-space: nowrap;">相关疾病</td><br />
<td style="padding: 10px 15px; color: #334155;">[[肾母细胞瘤]] • [[卵巢癌]] • [[家族性骨髓增生异常综合征]]</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; white-space: nowrap;">酶学特征</td><br />
<td style="padding: 10px 15px; color: #334155;">[[RNase III]] • [[dsRNA结合域]] • [[Mg2+依赖]] • 核定位</td><br />
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</table><br />
</div><br />
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