TCGA 数据获取

本笔记的目的为记录获取 TCGA 中乳腺癌的转录组测序数据,为后续的分析做准备。

载入所需包

library(TCGAbiolinks)
library(dplyr)

Attaching package: 'dplyr'
The following objects are masked from 'package:stats':

    filter, lag
The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union
library(DT)

使用getGDCprojects()$project_id得到各个癌种的项目id。

getGDCprojects()$project_id
 [1] "CGCI-HTMCP-CC"             "TARGET-AML"               
 [3] "GENIE-JHU"                 "GENIE-MSK"                
 [5] "GENIE-VICC"                "GENIE-MDA"                
 [7] "TCGA-MESO"                 "TARGET-ALL-P3"            
 [9] "TCGA-UVM"                  "TCGA-KICH"                
[11] "TARGET-WT"                 "TARGET-OS"                
[13] "TCGA-DLBC"                 "GENIE-UHN"                
[15] "APOLLO-LUAD"               "CDDP_EAGLE-1"             
[17] "EXCEPTIONAL_RESPONDERS-ER" "MP2PRT-WT"                
[19] "CGCI-HTMCP-DLBCL"          "CMI-MPC"                  
[21] "WCDT-MCRPC"                "TCGA-CHOL"                
[23] "TCGA-UCS"                  "TCGA-PCPG"                
[25] "CPTAC-2"                   "TCGA-CESC"                
[27] "TCGA-LIHC"                 "TCGA-ACC"                 
[29] "CMI-MBC"                   "TCGA-BRCA"                
[31] "CPTAC-3"                   "TCGA-COAD"                
[33] "TCGA-GBM"                  "TCGA-TGCT"                
[35] "NCICCR-DLBCL"              "TCGA-LGG"                 
[37] "FM-AD"                     "GENIE-GRCC"               
[39] "CTSP-DLBCL1"               "TARGET-CCSK"              
[41] "GENIE-NKI"                 "TARGET-ALL-P1"            
[43] "MATCH-N"                   "TRIO-CRU"                 
[45] "CMI-ASC"                   "TARGET-RT"                
[47] "ORGANOID-PANCREATIC"       "MATCH-Z1D"                
[49] "MATCH-B"                   "VAREPOP-APOLLO"           
[51] "MATCH-Q"                   "BEATAML1.0-CRENOLANIB"    
[53] "MATCH-Y"                   "OHSU-CNL"                 
[55] "CGCI-HTMCP-LC"             "TARGET-NBL"               
[57] "TCGA-SARC"                 "TCGA-PAAD"                
[59] "TCGA-LUAD"                 "TCGA-PRAD"                
[61] "MP2PRT-ALL"                "TCGA-LUSC"                
[63] "TCGA-LAML"                 "TCGA-SKCM"                
[65] "HCMI-CMDC"                 "BEATAML1.0-COHORT"        
[67] "TCGA-BLCA"                 "TCGA-READ"                
[69] "TCGA-UCEC"                 "TCGA-THCA"                
[71] "TCGA-OV"                   "TCGA-KIRC"                
[73] "MMRF-COMMPASS"             "GENIE-DFCI"               
[75] "TCGA-HNSC"                 "TCGA-ESCA"                
[77] "CGCI-BLGSP"                "TARGET-ALL-P2"            
[79] "TCGA-STAD"                 "REBC-THYR"                
[81] "TCGA-KIRP"                 "TCGA-THYM"                

TCGA 的数据种类有以下几种:

  • Simple Nucleotide Variation

  • Transcriptome Profiling

  • Biospecimen

  • Sequencing Reads

  • Copy Number Variation

  • Clinical

  • DNA Methylation

  • Combined Nucleotide Variation

  • ……

可以使用TCGAbiolinks:::getProjectSummary(project)查看project中有哪些数据类型,如查询 “TCGA-LIHC”,有7种数据类型,case_count为病人数,file_count为对应的文件数。要下载表达谱,可以设置data.category="Transcriptome Profiling"

TCGAbiolinks:::getProjectSummary("TCGA-BRCA")
$file_count
[1] 58776

$data_categories
  file_count case_count               data_category
1       7562       1098            Sequencing Reads
2       5316       1098                 Biospecimen
3      12066       1098       Copy Number Variation
4      17111       1098 Simple Nucleotide Variation
5       4876       1097     Transcriptome Profiling
6       3714       1097             DNA Methylation
7       2288       1098                    Clinical
8       4924       1095        Structural Variation
9        919        881          Proteome Profiling

$case_count
[1] 1098

$file_size
[1] 1.813754e+14

仅查看 TCGA 癌症的名称:

projects <- TCGAbiolinks::getGDCprojects()$project_id
projects <- projects[grepl('^TCGA', projects, perl=TRUE)]

projects
 [1] "TCGA-MESO" "TCGA-UVM"  "TCGA-KICH" "TCGA-DLBC" "TCGA-CHOL" "TCGA-UCS" 
 [7] "TCGA-PCPG" "TCGA-CESC" "TCGA-LIHC" "TCGA-ACC"  "TCGA-BRCA" "TCGA-COAD"
[13] "TCGA-GBM"  "TCGA-TGCT" "TCGA-LGG"  "TCGA-SARC" "TCGA-PAAD" "TCGA-LUAD"
[19] "TCGA-PRAD" "TCGA-LUSC" "TCGA-LAML" "TCGA-SKCM" "TCGA-BLCA" "TCGA-READ"
[25] "TCGA-UCEC" "TCGA-THCA" "TCGA-OV"   "TCGA-KIRC" "TCGA-HNSC" "TCGA-ESCA"
[31] "TCGA-STAD" "TCGA-KIRP" "TCGA-THYM"

数据下载

查询所需数据

GDCquery()筛选我们需要的数据,TCGAbiolinks包下载 TCGA 数据进行表达差异分析-乳腺癌案例

query <- GDCquery(project = "TCGA-BRCA",
                  data.category = "Transcriptome Profiling",
                  data.type = "Gene Expression Quantification", 
                  workflow.type = "STAR - Counts")
--------------------------------------
o GDCquery: Searching in GDC database
--------------------------------------
Genome of reference: hg38
--------------------------------------------
oo Accessing GDC. This might take a while...
--------------------------------------------
ooo Project: TCGA-BRCA
--------------------
oo Filtering results
--------------------
ooo By data.type
ooo By workflow.type
----------------
oo Checking data
----------------
ooo Checking if there are duplicated cases
ooo Checking if there are results for the query
-------------------
o Preparing output
-------------------
# 获取样本的 barcode
samplesDown <- getResults(query,cols=c("cases"))

根据组织类型筛选数据

# 从samplesDown中筛选出TP(实体肿瘤)样本的barcodes
# TCGAquery_SampleTypes(barcode, typesample)
# TP代表PRIMARY SOLID TUMOR;NT-代表Solid Tissue Normal
##此处共检索出371个TP样本barcodes
dataSmTP <- TCGAquery_SampleTypes(barcode = samplesDown,
                                  typesample = "TP")

# 从samplesDown中筛选出NT(正常组织)样本的barcode
#此处共检索出50个NT样本barcodes
dataSmNT <- TCGAquery_SampleTypes(barcode = samplesDown,
                                  typesample = "NT")

TCGA 样本类型及其缩写:

TP PRIMARY SOLID TUMOR TM Metastatic
TR RECURRENT SOLID TUMOR TAM Additional Metastatic
TB Primary Blood Derived Cancer-Peripheral Blood THOC Human Tumor Original Cells
TRBM Recurrent Blood Derived Cancer-Bone Marrow TBM Primary Blood Derived Cancer-Bone Marrow
TAP Additional-New Primary NB Blood Derived Normal
NT Solid Tissue Normal NBC Buccal Cell Normal‍‍‍
NEBV EBV Immortalized Normal NBM Bone Marrow Normal

设置barcodes参数,筛选符合要求的 371 个肿瘤样本数据和50正常组织数据:

queryDown <- GDCquery(project = "TCGA-BRCA",
                      data.category = "Transcriptome Profiling",
                      data.type = "Gene Expression Quantification", 
                      workflow.type = "STAR - Counts",
                      barcode = c(dataSmTP, dataSmNT))
--------------------------------------
o GDCquery: Searching in GDC database
--------------------------------------
Genome of reference: hg38
--------------------------------------------
oo Accessing GDC. This might take a while...
--------------------------------------------
ooo Project: TCGA-BRCA
--------------------
oo Filtering results
--------------------
ooo By data.type
ooo By workflow.type
ooo By barcode
----------------
oo Checking data
----------------
ooo Checking if there are duplicated cases
ooo Checking if there are results for the query
-------------------
o Preparing output
-------------------

下载数据

GDCdownload(queryDown,method = "api", directory = "GDCdata",
            files.per.chunk = 100)
Downloading data for project TCGA-BRCA
Of the 1224 files for download 1224 already exist.
All samples have been already downloaded

数据准备与保存

GDCprepare()将前面GDCquery()的结果准备成R语言可处理的SE(SummarizedExperiment)文件:

dataPrep <- GDCprepare(
  query = queryDown, 
  save = TRUE, 
  save.filename = "BRCA.rds"
)

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|====================================================|100%                      Completed after 1 m 
Starting to add information to samples
 => Add clinical information to samples
 => Adding TCGA molecular information from marker papers
 => Information will have prefix 'paper_' 
brca subtype information from:doi.org/10.1016/j.ccell.2018.03.014
Available assays in SummarizedExperiment : 
  => unstranded
  => stranded_first
  => stranded_second
  => tpm_unstrand
  => fpkm_unstrand
  => fpkm_uq_unstrand
=> Saving file: BRCA.rds
=> File saved

GDCprepare()中的参数:

参数 用法
query 来自GDCquery的结果
save 是否将结果保存为RData object,默认为TRUE
save.filename 文件名,如果没有设置,系统将默认设置
directory 文件数据的文件夹,默认为"GDCdata"
summarizedExperiment 是否生成summarizedExperiment对象,默认TRUE

至此已经保存好了乳腺癌的转录组数据,以用于下游的处理与分析。