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python实战直播学习:顶刊杂志的单细胞数据(GSE154826)分析

  • 2026-03-13 07:27:46
python实战直播学习:顶刊杂志的单细胞数据(GSE154826)分析

python基本部分学完了之后,见专辑《python生信笔记》,就需要开始进行大量的数据分析实战练习进行掌握了。今天来学习一篇顶刊杂志的单细胞数据处理,使用python!

note:这个数据主要来自最近开一个直播进行实战训练,详细情况以及进群方式见:python单细胞数据分析实战直播交流群

整个直播计划见文档:https://www.yuque.com/xinnigegui-uqv7c/nneog4/ecg5ec5hscuiudqq

此外,我们生信技能树每月都有一期0基础的生信入门培训班,对新手超级友好,有超贴心的各种答疑服务,3月份的在这里:生信入门&数据挖掘线上直播课2026年3月班。快来添加小助手报名咨询吧。

数据背景

今天分析直播的那篇文献里面里面提到的 Maier, Merad et al. 数据,来自文献 10.1016/j.ccell.2021.10.009。文献标题为《Single-cell analysis of human non-small cell lung cancer lesions refines tumor classification and patient stratification》。2021 年12月13号发表在 Cancer Cell 杂志(IF=38.585/Q1)上。

数据集为:data/12_input_adatas/maier_merad_2020_nsclc.h5ad,在文献里面的下载地址为 :https://zenodo.org/records/7227571,在里面的压缩包 input_data.tar.xz 中。

直播文献里面的数据全部在文献的table S1中:

Maier_Merad_2020_NSCLC 简介

本文对 35 例早期 NSCLC 病灶的 361,929 个细胞进行单细胞 RNA 测序,鉴定出一个由 PDCD1+CXCL13+ 活化 T 细胞、IgG+ 浆细胞和 SPP1+ 巨噬细胞构成的细胞模块,命名为肺癌活化模块(LCAMhi)。并在多个 NSCLC 队列中验证了 LCAMhi 的富集特征,并通过配对 CITE-seq 技术建立了识别 LCAMhi 病灶的抗体组合。研究发现 LCAM 的存在与总体免疫细胞含量无关,但与 TMB、癌睾抗原及 TP53 突变显著相关。即使在 TMB 高于中位值的患者中,高基线 LCAM 评分仍与 NSCLC免疫治疗增强应答相关,提示免疫细胞组成虽与 TMB 相关,但可能作为免疫治疗应答的非冗余生物标志物。

代码:https://github.com/effiken/Leader_et_al

本文数据:https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE154826

此外,看了下 CITE-seq 与 scRNA-seq的区别。

这个研究的数据用的比较复杂,每个图用了哪几个样本可以参考文献的 Table S7.

这里我就直接用直播的那篇图谱文献里面的h5ad文件了:maier_merad_2020_nsclc.h5ad

数据的百度链接可以在语雀文档里面找到:https://www.yuque.com/xinnigegui-uqv7c/nneog4/ecg5ec5hscuiudqq

0.加载python模块

还是老环境 conda 小环境sc2,缺啥在里面安装就好了:

# %%# %load_ext autoreload# %autoreload 2import scanpy as scimport numpy as npimport pandas as pdimport scipy.sparse as spfrom scanpy_helpers.annotation import AnnotationHelperfrom nxfvars import nxfvarssc.set_figure_params(figsize=(5, 5))

1.数据读取

读取上面的h5ad文件,查看里面的各种信息:

../data/12_input_adatas/maier_merad_2020_nsclc.h5ad

# 加载数据adata = sc.read_h5ad(filename="../data/12_input_adatas/maier_merad_2020_nsclc.h5ad" )adata

AnnData object with n_obs × n_vars = 6506 × 33660 obs: 'sample', 'annot', 'tissue', 'patient', 'condition', 'origin'

看一下数据其他的信息:

# 看列名adata.obs.columns.to_list()# ['sample', 'annot', 'tissue', 'patient', 'condition', 'origin']adata.obs

样本数,注释信息:这里看着只用的DC亚群的数据。

adata.obs['sample'].value_counts()adata.obs['annot'].value_counts()adata.obs['tissue'].value_counts()adata.obs['patient'].value_counts()adata.obs['condition'].value_counts()adata.obs['origin'].value_counts()

看一些简单的信息:

#表达矩阵里的数值范围np.min(adata.X),np.max(adata.X)#过滤前adata.X.shapeadata[0:6, ['CD3D','TCL1A','MS4A1']].to_df()adata.var.head()# 查看细胞名adata.obs_names[:10]

2.数据过滤

首先还是计算每个细胞中线粒体基因,核糖体基因,红血细胞基因表达比例:

# 计算线粒体基因比例adata.var['mt']=adata.var_names.str.startswith('MT-')# 计算核糖体基因比例adata.var['ribo']=adata.var_names.str.match('^RP[SL]')# 计算红血细胞基因比例adata.var['hb']=adata.var_names.str.match('^HB[^(P)]')# 计算sc.pp.calculate_qc_metrics(adata,qc_vars=['mt','ribo','hb'],percent_top=None,log1p=False,inplace=True)# 质控adata.obs.head()# 每个基因在多少个细胞中表达adata.var.head()# 绘制小提琴图from matplotlib.pyplot import rc_contextwith rc_context({"figure.figsize": (11, 10)}):    sc.pl.violin(        adata,        ['n_genes_by_counts','total_counts','pct_counts_mt'],        groupby="sample",        jitter=0.4,rotation=90,multi_panel=True,#stripplot=False,  # remove the internal dots#inner="box",  # adds a boxplot inside violins    )

过滤前的小提琴信息如下:

直播文献里面给的过滤参数:

这个过滤指标我每次看到都觉得很随意和主观!!!

按照文献里面给的看看:

## 过滤前的数据adata.shape# (6506, 33660)## 过滤# 方法2:一次性过滤所有条件(更高效)adata = adata[    (adata.obs['n_genes_by_counts'] > 400) &     (adata.obs['n_genes_by_counts'] < 10000) &    (adata.obs['total_counts'] > 1000) &     (adata.obs['total_counts'] < 30000) &    (adata.obs['pct_counts_mt'] < 15), :].copy()## 过滤后的数据adata.shape# (6387, 33660)

一共过滤掉了 119个细胞。

过滤后的小提琴图如下:

from matplotlib.pyplot import rc_contextwith rc_context({"figure.figsize": (9, 10)}):    sc.pl.violin(        adata,        ['n_genes_by_counts','total_counts','pct_counts_mt'],        groupby="sample",        jitter=0.4,rotation=90,multi_panel=True,#stripplot=False,  # remove the internal dots#inner="box",  # adds a boxplot inside violins    )

3.降维聚类

基本上都是scanpy的标准流程了:这里细胞数不多跑起来比较快。

# 首先将数据矩阵标准化(校正文库大小):sc.pp.normalize_total(adata,target_sum=1e4)# 对数据进行logsc.pp.log1p(adata)adata.raw = adata.copy()# 高变基因sc.pp.highly_variable_genes(adata)# 归一化sc.pp.scale(adata)# pca分析sc.tl.pca(adata,use_highly_variable=True)# harmony整合sc.external.pp.harmony_integrate(adata,'sample')# 聚类sc.pp.neighbors(adata,use_rep='X_pca_harmony',n_pcs=50)sc.tl.umap(adata)# Using the igraph implementation and a fixed number of iterations can be significantly faster, especially for larger datasetssc.tl.leiden(adata, flavor="igraph", n_iterations=2,resolution=0.5)adata

跑完了后可以看到anndata里面多了很多信息,如果你对这个数据结构还不熟悉,看看这个帖子:做单细胞和空转必须了解的AnnData数据结构

看下umap图

群里经常看到有人问:怎么判断自己的整合效果好不好?问下自己看看。

下面是聚类结果umap:

# umap图from matplotlib.pyplot import rc_contextwith rc_context({"figure.figsize": (6.5, 6.2)}):    sc.pl.umap(adata, color=["leiden"], legend_loc="on data", size=10)

下面是sample上色的聚类结果umap:不同样本均匀分散在各大群里。

# umap图from matplotlib.pyplot import rc_contextwith rc_context({"figure.figsize": (8, 7)}):    sc.pl.umap(adata, color=["sample"], size=10) # 样本太多了所以是灰色?

下面是不同组织来源的聚类结果umap:结果也比较均匀

# umap图from matplotlib.pyplot import rc_contextwith rc_context({"figure.figsize": (8, 7)}):    sc.pl.umap(adata, color=["origin"], legend_loc="on data", size=12) 

下面是作者的注释信息:可以看到分类结果跟作者的注释信息一致。

# umap图from matplotlib.pyplot import rc_contextwith rc_context({"figure.figsize": (8, 7)}):    sc.pl.umap(adata, color=["annot"], legend_loc="on data", size=12) 

发问:

上面的harmony整合效果如何?

如果你判断不出来,来学习我们这个python单细胞直播系列吧,3月份准备续接起来啦,每周至少一期直播。

添加新叶的微信Biotree123,报暗号python直播学习进群。

今天分享到这里~

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  1. CONNECT:[ UseTime:0.000620s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000749s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001471s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001068s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000500s ]
  6. SELECT * FROM `set` [ RunTime:0.002466s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000559s ]
  8. SELECT * FROM `article` WHERE `id` = 479015 LIMIT 1 [ RunTime:0.000420s ]
  9. UPDATE `article` SET `lasttime` = 1774594448 WHERE `id` = 479015 [ RunTime:0.003402s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000296s ]
  11. SELECT * FROM `article` WHERE `id` < 479015 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000660s ]
  12. SELECT * FROM `article` WHERE `id` > 479015 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000447s ]
  13. SELECT * FROM `article` WHERE `id` < 479015 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.013001s ]
  14. SELECT * FROM `article` WHERE `id` < 479015 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005158s ]
  15. SELECT * FROM `article` WHERE `id` < 479015 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002047s ]
0.159551s