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What is HT (High Throughput)?

What is HT (High Throughput)?

The Chromium Next GEM Single Cell 3’ and 5' HT kits (referred to as high throughput or HT) are high throughput, cost-effective solutions for profiling gene expression at the single cell level. In combination with Feature Barcode technology, the 3' and 5' HT assays also enable simultaneous cell surface protein detection and CRISPR profiling in single cells. The HT kits offer 16 channels per chip, and allow more cells to be recovered per channel compared to the standard assay and LT kits:

  • HT: 2,000-20,000 cells per channel (3' and 5') or 2,000-60,000 cells per channel with CellPlex (3' only).
  • LT: 100-1,000 cells per channel (3' only).
  • Standard assay: 500-10,000 cells per channel (3' and 5') or 500-30,000 cells per channel with CellPlex (3' only).

The Chromium X Series is the next generation of 10x Genomics instrumentation, purposefully designed to enable high-throughput experiments, offering a highly optimized approach to single cell studies. The Chromium X Series is one instrument, available in two firmware options (Chromium X and Chromium iX). All 10x Genomics single cell dual index assays are supported on Chromium X Series instruments, but the HT kits can only be run on the Chromium X, not iX.

Cell Ranger v6.1 or later is required to analyze HT data. After demultiplexing the BCL files, run cellranger count or cellranger multi on the FASTQ data to obtain output files. The pipeline should autodetect HT libraries for 3' CellPlex samples, in which case the chemistry tab in the web_summary.html will show HT appended. One can also use the chemistry=SC3Pv3HT option in the multi CSV file (this is only recommended if there is an error in automatic detection).

The Chromium X enables million-cell experiments to be run on a single HT chip. To aggregate data from multiple GEM wells requires running cellranger aggr on the molecule_info.h5 files output by cellranger count or cellranger multi.

Cell Ranger processes HT libraries similarly to standard libraries except for minor adjustments to certain parameters in the cell calling algorithm. Starting with Cell Ranger v7.0, the expected number of cells can be auto-estimated or specified with --expect-cells (see Gene Expression algorithm overview).

Loupe Browser v6.0 or later is recommended for the analysis of datasets with over 100k cells and performs well on HT datasets of over one million cells.