Get Expression Pca

Find gene expression PCA data.

• Returns gene expression PCA (principal component analysis) in tissues.

• Results may be filtered by tissue, sample, or dataset.

By default, the service queries the latest GTEx release.

GTEx Portal API documentation

Usage

get_expression_pca(
  tissueSiteDetailIds,
  datasetId = "gtex_v8",
  sampleId = NULL,
  page = 0,
  itemsPerPage = 250
)

Arguments

tissueSiteDetailIds

Character vector of IDs for tissues of interest. Can be GTEx specific IDs (e.g. "Whole_Blood"; use get_tissue_site_detail() to see valid values) or Ontology IDs.

datasetId

String. Unique identifier of a dataset. Usually includes a data source and data release. Options: "gtex_v8", "gtex_snrnaseq_pilot".

sampleId

String. ^GTEX-[A-Z0-9]{5}-[0-9]{4}-SM-[A-Z0-9]{5}$

page

Integer (default = 0).

itemsPerPage

Integer (default = 250).

Value

A tibble.

See also

Other Expression Data Endpoints: get_clustered_median_exon_expression(), get_clustered_median_gene_expression(), get_clustered_median_junction_expression(), get_clustered_median_transcript_expression(), get_gene_expression(), get_median_exon_expression(), get_median_gene_expression(), get_median_junction_expression(), get_median_transcript_expression(), get_single_nucleus_gex(), get_single_nucleus_gex_summary(), get_top_expressed_genes()

Examples

# \dontrun{
get_expression_pca(tissueSiteDetailIds = c("Adipose_Subcutaneous",
                                           "Whole_Blood"))
#> Warning: ! Total number of items (1418) exceeds maximum page size (250).
#> ℹ Try increasing `itemsPerPage`.
#> 
#> ── Paging info ─────────────────────────────────────────────────────────────────
#> • numberOfPages = 6
#> • page = 0
#> • maxItemsPerPage = 250
#> • totalNumberOfItems = 1418
#> # A tibble: 250 × 7
#>        pc1      pc2      pc3 sampleId    tissueSiteDetailId ontologyId datasetId
#>      <dbl>    <dbl>    <dbl> <chr>       <chr>              <chr>      <chr>    
#>  1  0.0385 -0.0178   0.0769  GTEX-1117F… Adipose_Subcutane… UBERON:00… gtex_v8  
#>  2 -0.0585  0.00809  0.00492 GTEX-111CU… Adipose_Subcutane… UBERON:00… gtex_v8  
#>  3  0.140  -0.0308  -0.0368  GTEX-111FC… Adipose_Subcutane… UBERON:00… gtex_v8  
#>  4  0.0597  0.140    0.0294  GTEX-111VG… Adipose_Subcutane… UBERON:00… gtex_v8  
#>  5 -0.0968  0.00233 -0.0174  GTEX-111YS… Adipose_Subcutane… UBERON:00… gtex_v8  
#>  6 -0.120   0.0195  -0.0594  GTEX-1122O… Adipose_Subcutane… UBERON:00… gtex_v8  
#>  7 -0.102   0.0652   0.00344 GTEX-1128S… Adipose_Subcutane… UBERON:00… gtex_v8  
#>  8  0.105   0.0174  -0.0568  GTEX-113IC… Adipose_Subcutane… UBERON:00… gtex_v8  
#>  9 -0.109  -0.0543   0.00594 GTEX-117YX… Adipose_Subcutane… UBERON:00… gtex_v8  
#> 10  0.132  -0.0335  -0.0350  GTEX-11DXW… Adipose_Subcutane… UBERON:00… gtex_v8  
#> # ℹ 240 more rows

get_expression_pca(tissueSiteDetailIds = "Adipose_Subcutaneous",
                   sampleId = "GTEX-1117F-0226-SM-5GZZ7")
#> 
#> ── Paging info ─────────────────────────────────────────────────────────────────
#> • numberOfPages = 1
#> • page = 0
#> • maxItemsPerPage = 250
#> • totalNumberOfItems = 1
#> # A tibble: 1 × 7
#>      pc1     pc2    pc3 sampleId         tissueSiteDetailId ontologyId datasetId
#>    <dbl>   <dbl>  <dbl> <chr>            <chr>              <chr>      <chr>    
#> 1 0.0385 -0.0178 0.0769 GTEX-1117F-0226… Adipose_Subcutane… UBERON:00… gtex_v8  
# }