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<table class="diff diff-contentalign-left diff-editfont-monospace" data-mw="interface">
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77921020：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
2026-01-22T09:42:15Z
<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 />
<br />
```<br />
<div style="margin-bottom: 30px; border-bottom: 1.2px solid #e2e8f0; padding-bottom: 25px;"><br />
<p style="font-size: 1.1em; margin: 10px 0; color: #334155; text-align: justify;"><br />
<strong>ATXN1</strong>（Ataxin-1），是导致<strong>[[脊髓小脑共济失调1型]]</strong>（SCA1）的致病基因。该基因编码一种定位于细胞核的染色质结合蛋白，主要作为转录抑制因子参与基因表达调控。ATXN1 的致病机制属于典型的<strong>[[多聚谷氨酰胺]]</strong>（PolyQ）扩增疾病：基因编码区的 CAG 三核苷酸重复序列异常扩增，导致蛋白中形成过长的 PolyQ 链。突变的 ATXN1 蛋白不仅容易发生错误折叠和聚集，形成<strong>[[核内包涵体]]</strong>（Nuclear Inclusions），更重要的是获得了“毒性功能”（Toxic Gain-of-Function），通过异常增强与 <strong>[[CIC]]</strong> 或 [[RBM17]] 的相互作用，破坏小脑浦肯野细胞的转录稳态，最终导致神经元退行性死亡。<br />
</p><br />
</div><br />
<br />
<div class="medical-infobox mw-collapsible mw-collapsed" style="width: 100%; max-width: 320px; margin: 0 auto 35px auto; border: 1.2px solid #bae6fd; border-radius: 12px; background-color: #ffffff; box-shadow: 0 8px 20px rgba(0,0,0,0.05); overflow: hidden;"><br />
<br />
<div style="padding: 15px; color: #1e40af; background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%); text-align: center; cursor: pointer;"><br />
<div style="font-size: 1.2em; font-weight: bold; letter-spacing: 1.2px;">ATXN1 / Ataxin-1</div><br />
<div style="font-size: 0.7em; opacity: 0.85; margin-top: 4px; white-space: nowrap;">SCA1 Causative Gene (点击展开)</div><br />
</div><br />
<br />
<div class="mw-collapsible-content"><br />
<div style="padding: 25px; text-align: center; background-color: #f8fafc;"><br />
<div style="display: inline-block; background: #ffffff; border: 1px solid #e2e8f0; border-radius: 12px; padding: 20px; box-shadow: 0 4px 10px rgba(0,0,0,0.04);"><br />
[[Image:ATXN1_structure_polyQ.png|100px|ATXN1 蛋白结构与 AXH 域]]<br />
</div><br />
<div style="font-size: 0.8em; color: #64748b; margin-top: 12px; font-weight: 600;">PolyQ 神经毒性 / 转录抑制</div><br />
</div><br />
<br />
<table style="width: 100%; border-spacing: 0; border-collapse: collapse; font-size: 0.85em;"><br />
<tr><br />
<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;">ATXN1</td><br />
</tr><br />
<tr><br />
<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;">SCA1, ATX1</td><br />
</tr><br />
<tr><br />
<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;">6p22.3</td><br />
</tr><br />
<tr><br />
<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;">6310</td><br />
</tr><br />
<tr><br />
<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;">P54253</td><br />
</tr><br />
<tr><br />
<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;">601556</td><br />
</tr><br />
<tr><br />
<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">突变类型</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">CAG 三核苷酸扩增</td><br />
</tr><br />
<tr><br />
<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>~816 aa</strong> (可变)</td><br />
</tr><br />
<tr><br />
<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;">86.9 kDa</td><br />
</tr><br />
<tr><br />
<th style="text-align: left; padding: 6px 12px; background-color: #f1f5f9; color: #475569; border-bottom: 1px solid #e2e8f0;">关键互作</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;"><strong>[[CIC]]</strong>, [[RBM17]], 14-3-3</td><br />
</tr><br />
<tr><br />
<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;">SCA1, 神经退行性变</td><br />
</tr><br />
</table><br />
</div><br />
</div><br />
<br />
<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：多聚谷氨酰胺的毒性陷阱</h2><br />
<br />
<p style="margin: 15px 0; text-align: justify;"><br />
ATXN1 的致病核心在于其 N 端的 <strong>PolyQ 扩增</strong>，这改变了蛋白的物理化学性质和互作网络，触发了复杂的级联反应。<br />
</p><br />
<br />
<ul style="padding-left: 25px; color: #334155;"><br />
<li style="margin-bottom: 12px;"><strong>毒性功能获得 (Toxic Gain-of-Function)：</strong><br />
<br>突变的 ATXN1 并不仅仅是失去功能，更主要的是获得了毒性。它能过度稳定 <strong>[[CIC]]</strong> (Capicua) 复合物，导致对 CIC 靶基因（如参与神经保护的基因）的过度抑制。此外，它还会与 RNA 结合蛋白 [[RBM17]] 形成异常复合物，干扰 RNA 剪接。</li><br />
<li style="margin-bottom: 12px;"><strong>关键磷酸化位点 (Ser776)：</strong><br />
<br>ATXN1 在 <strong>Ser776</strong> 位点的磷酸化是其致病性的“分子开关”。该位点的磷酸化促进 ATXN1 与 <strong>[[14-3-3]]</strong> 蛋白结合，这种结合稳定了 ATXN1 蛋白，防止其被降解，从而导致其在细胞内过度积累。研究表明，即使存在 PolyQ 扩增，如果将 Ser776 突变为不可磷酸化的丙氨酸，也能显著减轻神经毒性。</li><br />
</ul><br />
[[Image:ATXN1_S776_phosphorylation_toxicity.png|100px|Ser776 磷酸化调控 ATXN1 稳定性与毒性]]<br />
<br />
<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：遗传早现与阈值</h2><br />
<div style="background-color: #fff5f5; border-left: 5px solid #e11d48; padding: 15px 20px; margin: 20px 0; border-radius: 4px;"><br />
<h3 style="margin-top: 0; color: #be123c; font-size: 1.1em;">致命的重复序列</h3><br />
<p style="margin-bottom: 0; text-align: justify; font-size: 0.95em; color: #334155;"><br />
SCA1 表现出显著的<strong>[[遗传早现]]</strong> (Anticipation) 现象，即随着代际传递，CAG 重复数倾向于增加，导致发病年龄提前，症状加重。<br />
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<strong>CAG 重复数阈值与 CAT 中断：</strong><br><br />
正常人群的 CAG 重复数通常在 6-44 之间。致病性扩增通常大于 <strong>39 次</strong>。<br />
<br><strong>关键细节：</strong> 在正常长重复序列（如 36-44 次）中，通常含有 1-2 个 <strong>CAT</strong>（编码组氨酸）中断。这些 CAT 中断能稳定 DNA 结构，防止扩增。如果缺乏 CAT 中断，即使是 39 次重复也可能导致疾病。因此，基因检测时不仅要看重复数，还要看是否有<strong>[[CAT中断]]</strong>。<br />
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<th style="padding: 12px; border: 1px solid #cbd5e1; color: #0f172a; width: 25%;">特征</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #475569;">数值 / 状态</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #1e40af;">临床意义</th><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">正常等位基因</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">6 - 35 CAG 重复</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">无致病风险，通常含有 CAT 中断。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">致病性扩增</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;"><strong>> 39 CAG 重复</strong></td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">导致 SCA1。重复次数越多，发病越早，进展越快（特别是无 CAT 中断时）。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">病理特征</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">核内包涵体 (NIs)</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">突变 ATXN1、泛素和伴侣蛋白形成的聚合物，是浦肯野细胞退化的标志。</td><br />
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目前尚无治愈 SCA1 的方法，但针对 ATXN1 分子机制的疗法正在快速发展。<br />
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<li style="margin-bottom: 12px;"><strong>反义寡核苷酸 (ASO)：</strong><br />
<br>通过特异性结合 ATXN1 mRNA，诱导 RNase H 介导的降解，从而降低总 ATXN1 蛋白水平。这是目前最有希望进入临床的策略。</li><br />
<li style="margin-bottom: 12px;"><strong>分子竞争 (ATXN1L)：</strong><br />
<br>如前所述，过表达 <strong>[[ATXN1L]]</strong> 可以置换出结合在 CIC 上的毒性 ATXN1，恢复转录平衡。</li><br />
<li style="margin-bottom: 12px;"><strong>抑制 Ser776 磷酸化：</strong><br />
<br>开发针对 [[MSK1]] 或 [[PKA]] 等激酶的抑制剂，或阻断 14-3-3 结合，以促进毒性 ATXN1 的降解。</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>Orr HT, Chung MY, Banfi S, et al. (1993).</strong> <em>Expansion of an unstable trinucleotide CAG repeat in spinocerebellar ataxia type 1.</em> <strong>[[Nature Genetics]]</strong>. 1993;4(3):221-226.<br><br />
<span style="color: #475569;">[学术点评]：发现之源。Zoghbi 和 Orr 实验室合作，首次定位并克隆了 SCA1 致病基因 ATXN1，确认了 CAG 动态突变机制，是神经遗传学领域的里程碑。</span><br />
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[2] <strong>Emamian ES, Kaytor MD, Duvick HA, et al. (2003).</strong> <em>Serine 776 phosphorylation of ataxin-1 is critical for protein stabilization, accumulation, and toxicity.</em> <strong>[[Neuron]]</strong>. 2003;38(3):375-387.<br><br />
<span style="color: #475569;">[学术点评]：机制突破。揭示了 Ser776 磷酸化在 ATXN1 毒性中的核心地位，证明了通过修饰特定氨基酸位点可逆转 PolyQ 毒性，为药物开发提供了新靶点。</span><br />
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[3] <strong>Lam YC, Bowman AB, Jafar-Nejad P, et al. (2006).</strong> <em>Ataxin-1 interaction with the repressor Capicua mediates its neurotoxicity.</em> <strong>[[Cell]]</strong>. 2006;127(7):1335-1347.<br><br />
<span style="color: #475569;">[学术点评]：互作网络。阐明了 ATXN1 与 CIC 的相互作用是导致小脑病变的关键分子事件，定义了“毒性功能获得”的具体生化途径。</span><br />
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ATXN1 · 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;">家族成员</td><br />
<td style="padding: 10px 15px; color: #334155;">[[ATXN1L]] (Boat, 保护因子) • [[PolyQ家族]] (HD, SCA3等)</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;">调控因子</td><br />
<td style="padding: 10px 15px; color: #334155;">[[Ser776]] (磷酸化位点) • [[14-3-3]] (稳定性) • [[Akt]] (激酶)</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;">关键结构</td><br />
<td style="padding: 10px 15px; color: #334155;">[[CAG重复]] • [[CAT中断]] • [[AXH结构域]] • [[NLS]]</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;">病理标志</td><br />
<td style="padding: 10px 15px; color: #334155;">[[小脑萎缩]] • [[浦肯野细胞]]丢失 • [[核内包涵体]] • [[共济失调]]</td><br />
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