Single Cell Expression Profiling & Genomics (10X Genomics, SPLiT-Seq & Plate-based scRNA-Seq)

We are excited to receive your 2021 projects! Make sure you plan your experiment and schedule your cell drop-off in advance. Contact Emily Kumimoto for details: ekumimoto@ucdavis.edu.

We are offering 10X Genomics, SPLit-Seq & plate-based single-cell sequencing services. Please see the bottom of the page for the latter options.

10X Genomics:

We working with the latest 10X Genomics chemistries (‘Next-GEM’ assays):

  • Single Cell Gene Expression (3′ GEX V3.1)
  • Single Cell Immune Profiling (5′ GEX V1.1 and V2 + V(D)J)
  • Single Cell ATAC-seq
  • Visium Library Preparation (slide preparation not included)
  • NEW Single Cell Multiome combined ATAC + GEX

Please schedule any 10X single cell experiment at least a week in advance. Please inquire with our 10X Genomics specialist Emily Kumimoto for further details on products and custom pricing. A consultation is required prior to any experiment scheduling. We offer free joint consultations with the bioinformatics core. We can also connect you with your local 10X sales specialists and scientists for office hour appointments!

************************************************************************UC Davis users with BSL1 samples can access our 10X Chromium controller as part of our shared instruments for customer use. This is advantageous if your group is planning a large number of single-cell experiments. Please contact 10X for training. Due to COVID19 concerns, we have suspended customer instrument use temporarily.
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The 10X Genomics Single Cell suite enables high capture efficiency (of up to 65% of cells loaded) with a flexible workflow, encapsulating 500 to 10,000 cells or nuclei per library together with micro-beads into nano-droplets.  Each bead is loaded with adapters containing one of  750,000 different barcodes for the single cell RNA-seq library preps.  In contrast to other protocols (e.g. Drop-Seq) the 10X controller is capable of loading “all” droplets with micro-beads, enabling single-Poisson distribution loading and thus high capture efficiencies (in contrast to double-Poisson loading of other protocols). The single-cell encapsulating process is significantly faster compared to inDrop or Drop-Seq. Up to eight samples can be processed per batch within minutes. The resulting data can be analyzed with the free Cell Ranger and Loupe Cell Browser software. In addition the Bioinformatics Core has developed a custom single-cell data analysis pipeline for 10X data.

Tsne-plot_single-cell

The principles of the 10X Single-Cell RNA-seq library preparation:

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10X Single-Cell Gene Expression (GEX)

10X Chromium Single Cell Features:

  • Fast workflow from cell suspension to 3′-cDNA or 5′-cDNA library.
  • Captures 100-10,000+ cells per sample and up to 80,000 cells per run in ~18minutes.
  • Recovers up to  ~65% of cells (typically 50%).
  • Low doublet rate (~0.9% per 1,000 cells).
  • Compatible with Illumina NovaSeq6000, HiSeq4000, NextSeq, and MiSeq sequencers.
    The 10X GEX Single-Cell libraries are most  economically sequenced on the Illumina NovaSeq 6000 with paired-end reads. (The assay requires at least a 28 cycle forward read, an 8 bp index read, and a 98 cycle reverse read).
  • For the most applications an average of 50,000 reads per cell should be sequenced (for cell types with complex transcriptomes). For isolated nuclei 25,000 reads each are recommended,
  • It is possible to work with cryo-preserved cells and methanol fixed, enabling safe sample shipping and batching.
  • The cell size limit is comparatively high.  Cells can have a diameter of up to 50 µm.
  • In addition to cell suspension samples also nuclei suspensions can be studied, enabling the analyses of brain tissues.
  • An add-on kit now allows tagging and pooling of human, mouse, and rat cell samples before 10X library prep potentially reducing the costs significantly. This also allows super-loading of a 10X chip channel (with up to 20,000 cells, not supported by 10X Genomics).
  • MULTI-Seq reagents even promise to enable the labeling and pooling of hundreds of cell suspension samples.

10XChromium

Single Cell GEX Resources:

10X Chromium Single Cell suspension sample requirements:

  • Minimum concentration of 100 cells/ul (700 to 1,200 cells/ul optimal range) in a volume of at least 40ul.
  • If at all possible, please provide 70ul of single cell suspension (two attempts at chip loading in case of clog plus additional for cell QC).  We will require 10 ul sample for the cell counter.
  • Maximum concentration of 2000 cells/ul.
  • Single cell suspension should be at least 70% live and free of visible debris and doublets.
  • Recommend cell suspension buffer is PBS/0.5% BSA.  Cell suspension buffers should be free of EDTA and Mg++ as well as free of DNAse to be compatible with single-cell assay.  Up to 2% BSA content is OK.  Please see 10X cell preparation guide.
  • For fresh samples submitting 40K+ cells total is best.
  • For frozen samples, 100,00 cells are the minimum, but 1 million are better.

Our automated cell counters (Luna FL, Logosbio, dual fluorescence, AO/PI)  and Countess II (Life Technologies, brightfield, Trypan blue ) can assist you with the preparation and QC of the cell suspension. The cell counters provide total cell counts, report viability, and measure average cell sizes in as little as 10 seconds. Please see the Luna FL guide and the Countess manual

CountessII-cell counter499x180

10X scATAC-Seq

The Chromium Single Cell ATAC Solution allows users to profile the regulatory landscape of chromatin in thousands of cells. Nuclei are transposed in a bulk solution and then are partitioned into nanoliter-scale Gel Beads in-emulsion (GEMs). Please inquire for QC requirements and loading concentration.

  • Tested on cell lines, primary cells, fresh, and cryopreserved samples.
  • The complete user guide is available here.

10X Multiome

This is the latest product launch by 10X and promises both gene expression data and regulatory landscape profiling in a single cell.  

  • Input: single nuclei.
  • The complete user guide is available here.

SPLiT-Seq Single-Cell Gene Expression

This single-cell sequencing method employs combinatorial indexing of the transcripts to identify the cells of origin. It was initially developed in the Seelig Lab (UW and Allen Institute for Brain Sciences) and is now commercially available through Split Biosciences. It has a lower price per cell than 10X and requires no specialized equipment as all indexing reactions are done in a 96-well plate. The SPLitSeq starting material are fixed samples, which allows fixing and storing samples for some time before running library preparation.

https://sites.google.com/uw.edu/splitseq/home