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使用Python处理单细胞数据

  • 2026-07-01 14:11:24
使用Python处理单细胞数据

前言

上一期使用R语言对GSE189357单细胞数据集进行了基础的分析,有同学留言有没有python相关的教程。近年来,随着单细胞测序技术的快速发展和测序成本的不断下降,越来越多的研究开始纳入大规模样本甚至百万级细胞的数据分析。在这种背景下,Python 生态中的 Scanpy、AnnData 和Omicverse等工具凭借其较高的计算效率及良好的扩展性,逐渐成为单细胞数据分析的重要选择。虽然目前 Seurat仍然是最受欢迎的单细胞分析工具之一,但对于大规模数据集Python也展现出了独特的优势。今天基于GSE189357数据集对Scanpy处理单细胞流程进行简单的整理。

我之前也是学习技能树曾老师他们的分析脚本,感兴趣的朋友也可以关注他们学习更多相关的知识。

数据选择

使用上期整理好的单细胞数据数据读入Python处理,没有整理的大家根据上期内容整理就行。单细胞转录组下游分析流程整理

数据读取

导入相应的python包

import scanpy as scimport numpy as npimport pandas as pdimport scipy.sparse as spsc.set_figure_params(figsize=(55))

查看我们的数据文件夹

import osos.listdir('./GSE189357_RAW/')

批量读取数据

inputdir = "./data/raw/GSE189357_RAW"samples = sorted(os.listdir(inputdir))adata = {}for sample in samples:    path = os.path.join(inputdir, sample)    data = sc.read_10x_mtx(        path,        var_names="gene_symbols",        cache=True    )    data.var_names_make_unique()    data.obs["sample"] = sample    name = sample    adata[name] = data    print(name)

数据合并

adata = sc.concat(adata,label='sampleid')adata.obs_names_make_unique()adata

计算质控指标:线粒体基因比例;核糖体基因比例和红血细胞基因比例

# 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()

这时候发现各个指标已经添加到了我们的obs当中。

可视化细胞的上述比例情况

from matplotlib.pyplot import rc_contextwith rc_context({"figure.figsize": (64)}):    sc.pl.violin(        adata,        ['n_genes_by_counts','total_counts','pct_counts_mt'],        groupby="sampleid",        jitter=0.3,rotation=90,multi_panel=True,        stripplot=False# remove the internal dots        inner="box"    )

过滤细胞

# 基本过滤sc.pp.filter_genes(adata, min_cells=3)## 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'] > 300) &     (adata.obs['n_genes_by_counts'] < 5000) &    (adata.obs['total_counts'] > 250) & #    (adata.obs['total_counts'] < 3000000) &    (adata.obs['pct_counts_mt'] < 20), :].copy()## 过滤后的数据adata.shape

质控后再看看

from matplotlib.pyplot import rc_contextwith rc_context({"figure.figsize": (64)}):    sc.pl.violin(        adata,        ['n_genes_by_counts','total_counts','pct_counts_mt'],        groupby="sampleid",        jitter=0.4,rotation=90,multi_panel=True,        stripplot=False,          inner="box"    )

降维聚类

保存数据

adata.write('./data/processed/adata_raw.h5ad')

这里去批次效应还是用harmony

# 首先将数据矩阵标准化(校正文库大小):adata.layers["counts"] = adata.X.copy()adata.raw = adata.copy()sc.pp.normalize_total(adata,target_sum=1e4)# 对数据进行logsc.pp.log1p(adata)# 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,'sampleid') # 这里用自己的样本名就行,我的是sampleid## 我发现我运行这个函数会报错,原因是sc.external.pp.harmony_integrate运行完的数据不符合adata.obsm中的数据储存形式,正好是反过来的,可能是软件版本问题,所以用了以下方法#--------------------------------------------------------------------import harmonypy as hmho = hm.run_harmony(    adata.obsm["X_pca"],    adata.obs,"sample")adata.obsm["X_pca_harmony"] = ho.Z_corr#--------------------------------------------------------------------# 聚类sc.pp.neighbors(adata,use_rep='X_pca_harmony',n_pcs=50)# sc.pp.neighbors(adata,use_rep='X_pca',n_pcs=30)sc.tl.umap(adata)sc.tl.tsne(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)
# umap图from matplotlib.pyplot import rc_contextwith rc_context({"figure.figsize": (6.56)}):    sc.pl.umap(adata, color=["leiden"], legend_loc="on data", size=7)
with rc_context({"figure.figsize": (6.56)}):    sc.pl.umap(adata, color=['sample'],size=7)

细胞注释

marker = {"T cell": ["CD3D""CD3E"],"NK": ["NKG7""GNLY"],"B cells": ["CD79A""CD79B""CD19"],"Plasma": ["MZB1""IGHG1"],"Myeloid": ["LYZ""TPSB2""AIF1""HLA-DRA""HLA-DRB1""CPA3"],"Epithelial": ["EPCAM""SCGB1A1"],"Endothelial": ["CLDN5""PECAM1"]}sc.pl.dotplot(adata,               marker,              groupby="leiden"              standard_scale="var",              show =False# save = '2.png'             )

这里我注释的比较草率,大家自己的数据要认真注释

adata.obs["celltype"] = "unknown"adata.obs.loc[adata.obs["leiden"].isin(["0""1","2","7"]), "celltype"] = "T&NK"adata.obs.loc[adata.obs["leiden"].isin(["12"]), "celltype"] = "B cell"adata.obs.loc[adata.obs["leiden"].isin(["8"]), "celltype"] = "Plasma"adata.obs.loc[adata.obs["leiden"].isin(["5""9""10""11""13""14""15","16","18","19","20"]), "celltype"] = "Myeloid"adata.obs.loc[adata.obs["leiden"].isin(["3""6""10"]), "celltype"] = "Epithelial"adata.obs.loc[adata.obs["leiden"].isin(["4""17"]), "celltype"] = "Endothelial"

按细胞类型画一下marker基因的dotplot

marker = {"T cell": ["CD3D""CD3E"],"NK": ["NKG7""GNLY"],"B cells": ["CD79A""CD79B""CD19"],"Plasma": ["MZB1""IGHG1"],"Myeloid": ["LYZ""TPSB2""AIF1""HLA-DRA""HLA-DRB1""CPA3"],"Epithelial": ["EPCAM""SCGB1A1"],"Endothelial": ["CLDN5""PECAM1"]}sc.pl.dotplot(adata,               marker,              groupby="celltype"              standard_scale="var",              show =False# save = '2.png'             )

保存数据

adata.write('./data/processed/adata_anno.h5ad')

画细胞比例图

import matplotlib.pyplot as pltfrom matplotlib.pyplot import rc_contextwith rc_context({"figure.figsize": (75)}):    ax = pd.crosstab(        adata.obs['sample'],        adata.obs['celltype'],        normalize='index'    ).plot(        kind='bar',        stacked=True,        xlabel=''    )    plt.legend(        bbox_to_anchor=(1.051),        loc='upper left',        frameon=False    )    plt.tight_layout()

写在最后

本次内容分享了scanpy是最基础的分析,对于单细胞的一些高级分析后续再分享,欢迎大家持续关注与交流。

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  1. CONNECT:[ UseTime:0.000617s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000804s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000707s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000288s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000628s ]
  6. SELECT * FROM `set` [ RunTime:0.000276s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000634s ]
  8. SELECT * FROM `article` WHERE `id` = 497985 LIMIT 1 [ RunTime:0.005266s ]
  9. UPDATE `article` SET `lasttime` = 1783042492 WHERE `id` = 497985 [ RunTime:0.001062s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000331s ]
  11. SELECT * FROM `article` WHERE `id` < 497985 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000478s ]
  12. SELECT * FROM `article` WHERE `id` > 497985 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000775s ]
  13. SELECT * FROM `article` WHERE `id` < 497985 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008663s ]
  14. SELECT * FROM `article` WHERE `id` < 497985 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004659s ]
  15. SELECT * FROM `article` WHERE `id` < 497985 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014409s ]
0.111614s