1162-生发中心抗体亲和力成熟的演化景观与选择动力学 episode artwork

EPISODE · Jun 21, 2026 · 18 MIN

1162-生发中心抗体亲和力成熟的演化景观与选择动力学

from 聊聊Sci

这篇文章通过对生发中心(GC)内B细胞受体的演化轨迹进行“平行复盘”实验,定量揭示了抗体亲和力成熟的动力学机制。研究团队结合深层突变扫描(DMS)技术与系统发育分析,构建了一个完整的“基因型—表型—适应度”景观模型,证明了突变偏好如何约束演化方向。实验发现,尽管单体演化路径各异,但持续且不完美的筛选压力确保了表型结果的高度可预测性。研究还指出,生发中心对低亲和力谱系的所谓“容忍度”以及成熟后期的平台期,很大程度上源于存活偏倚导致的系统发育观测偏差。最终,该成果深化了对免疫系统如何在高噪声环境下优化抗体效能的理解,为疫苗设计提供了理论支撑。References:DeWitt WS, Vora AA, Araki T, Galloway JG, Alkutkar T, Bortolatto J, Castro TBR, Dumm W, Jennings-Shaffer C, Jia T, Mesin L, Ozorowski G, Pae J, Ralph DK, Bloom JD, Nourmohammad A, Song YS, Ward AB, Starr TN, Matsen FA 4th, Victora GD. Replaying germinal center evolution on a quantified affinity landscape. Cell. 2026 Jun 5:S0092-8674(26)00572-6. doi: 10.1016/j.cell.2026.05.013. Epub ahead of print. PMID: 42248140.前往小宇宙评论区与主播互动

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1162-生发中心抗体亲和力成熟的演化景观与选择动力学

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