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恭喜南京医大团队又带着【单细胞+空间转录组】上分10+!思路已就位,大家跟着学起来!

  • 2026-06-13 09:26:43
恭喜南京医大团队又带着【单细胞+空间转录组】上分10+!思路已就位,大家跟着学起来!

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WINTER

想要开展一个新课题,大家觉得的从哪个方向更好上手呢?如果是小羊的话,那咱们当然优选“单基因+生信”方向啊,从生信角度揭示该基因在某个疾病发展中的重要作用,随后以围绕其功能展开课题,可以算是一个很好的研究方向了。

今天就给大家分享一篇南京医大团队发表在J Immunother Cancer(IF 10.2)上的文章,他们是围绕基因KRAS展开,并研究其突变状态下结直肠癌(CRC)免疫抑制空间生态位情况。(KRAS是CRC中最易发生突变的基因,并且与肿瘤发展和耐药性都显著相关,临床意义很高啊。从突变这个角度找目标基因,这个点大家也可以利用起来

思路上,文章则是主要利用了单细胞分析结合空间转录组作为前期研究框架,不仅系统绘制了一个KRAS突变型CRC关键细胞的空间分布情况,还揭示了一个潜在的通讯轴。

文章整体的设计思路是比较容易理解的,如果你对这个分析角度和联合思路感兴趣,想复现或者定制个性化分析思路的宝子只需要把你的研究方向告诉我,剩下的就交给小羊了,专业团队主打一个省心满意~

担心学不会?不存在的! 我们奉行 “一对一,教到会” 的保姆级服务,从设计到分析,手把手带你通关

中文题目:单细胞和空间转录组分析识别了KRAS突变结直肠癌中的免疫抑制空间生态位

发表期刊:J Immunother Cancer

发表时间:2025年12月

研究背景

 KRAS是结直肠癌(CRC)中最常突变的基因之一,在肿瘤发生、进展、免疫逃避和治疗耐药性中起着关键作用。KRAS突变CRC中显著的异质性凸显了对更精准和个性化治疗方法的紧迫需求。

研究思路

研究团队从南京医科大学附属苏州医院收集了4例结直肠癌患者的肿瘤组织样本,并采用10x Genomics Visium空间转录组技术进行测序。
同时,整合了公共数据库中的scRNA-seq数据,共分析27例KRAS野生型和突变型患者样本。使用Scanpy进行数据预处理和聚类,通过Harmony和SCTransform进行批次效应校正和基因表达标准化。
空间细胞类型去卷积采用Cell2location算法,细胞通讯分析使用CellChat、MISTy和stLearn。研究还进行了单细胞GSEA分析、CNV分析、多重免疫组化验证以及小鼠模型构建,包括KRASG12D/+; Villin-Cre转基因小鼠,通过AOM/DSS诱导肿瘤并进行scRNA-seq分析。

研究结果

1

ScRNA-seq识别KRAS突变相关上皮细胞

    我们整合了来自27个KRAS野生型和KRAS突变CRC样本的scRNA-seq数据,这些样本来自公开scRNA-seq数据库。随后我们使用Scrublet去除潜在双重蛋白,随后过滤掉UMI <200或线粒体和核糖体基因含量超过50%的低质量细胞。最终得到136,890个高质量细胞。我们进行了标准化和归一化,挑选了5,000个高度变异基因,并对线粒体和核糖体基因含量进行了线性回归。
    对细胞组成的进一步分析显示,Epi_01亚群在KRAS突变体与KRAS野生型组之间的比例相似。这一观察使设KRAS突变可能主要通过重塑TME发挥其生物学效应,而非该上皮亚克隆的内在扩展。

    2

    Fib_CTHRC1和Mono_S100A8在KRAS突变CRC中发挥关键作用

    Fib_CTHRC1成纤维细胞分泌胶原蛋白,与KRAS突变上皮细胞上的整合素受体相互作用,形成物理屏障,排斥淋巴细胞浸润。

    3

    空间分析显示KRAS突变CRC的异质性更高

    肿瘤异质性被广泛认为是驱动治疗耐药性的关键因素之一。肿瘤的异质性越大,药物治疗的效果就越差。为分析肿瘤异质性,采用推理CNV方法评估每个部位的CNV状态。我们选择了表达高水平免疫细胞标志物(如PTPRC、CD3D和CD3E)的点点,作为计算每个点CNV分数的参考点。

    基于每个点的CNV评分进行莱顿聚类分析,观察到KRAS突变组中的CRC_MUT_A1和CRC_MUT_B1均表现出五个不同的CNV状态亚组。相比之下,野生型组的CRC_WT_C1和CRC_WT_D1亚组仅有四个CNV状态亚组。

    这表明KRAS突变肿瘤表现出更多突变状态,反映出更高的异质性。这种异质性可能与KRAS突变肿瘤中观察到的治疗耐药性有关。

    4

    KRAS突变CRC的空间架构

    空间分析揭示KRAS突变型肿瘤具有更高的拷贝数变异(CNV)异质性,与治疗耐药性相关。

    文章小结

    本研究为KRAS突变型结直肠癌的免疫治疗提供了新的空间框架,揭示了MDK_SDC4和胶原-整合素信号轴在免疫抑制微环境形成中的关键作用。研究中鉴定的分子特征(CEACAM1、CTHRC1、S100A8)可用于开发多重免疫组化分层系统,实现KRAS突变患者的精准治疗。未来研究应进一步采用更高分辨率的空间技术及功能验证,探索针对该生态位的治疗策略,以克服KRAS突变型肿瘤的治疗耐药性。

    别让繁琐的数据分析拖慢科研进度!专业团队,懂你所需、解你所难:转录组、单细胞、肠道菌群…… 无论哪个领域,机器学习、孟德尔随机化等工具信手拈来感兴趣的小伙伴可以滴滴小羊,方案设计、生信分析,高速服务器,应有尽有哦! 

    END

    往期推荐

    1

    IF:93.6!恭喜中国医科大学,两个月纯生信轻松拿下top刊!我要向全世界安利GBD数据库!

    2

    23.5/Q1,中山大学团队:从“棕榈酰化”研究铁死亡,再加上“分子对接+虚拟筛选+SPR”,轻松拿下水刊“之王”NC!

    3

    14.7/Q1,山东大学团队:单细胞测序+分析泛素化和巨噬细胞直接拿下“水刊之王”NC!

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    1. CONNECT:[ UseTime:0.000513s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000862s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000361s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000417s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000644s ]
    6. SELECT * FROM `set` [ RunTime:0.000249s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000787s ]
    8. SELECT * FROM `article` WHERE `id` = 559921 LIMIT 1 [ RunTime:0.000526s ]
    9. UPDATE `article` SET `lasttime` = 1781356533 WHERE `id` = 559921 [ RunTime:0.018917s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000320s ]
    11. SELECT * FROM `article` WHERE `id` < 559921 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000594s ]
    12. SELECT * FROM `article` WHERE `id` > 559921 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000397s ]
    13. SELECT * FROM `article` WHERE `id` < 559921 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002300s ]
    14. SELECT * FROM `article` WHERE `id` < 559921 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003802s ]
    15. SELECT * FROM `article` WHERE `id` < 559921 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009306s ]
    0.139903s