title: Single-cell RNA-seq of peripheral blood mononuclear cells from Huntington's disease patients and controls
design: Single-cell RNA-seq of peripheral blood mononuclear cells from Huntington's disease patients and controls
library_construction_protocol: Human volunteers were recruited through the Service of Neurology of the Hospital General Universitario Dr. Balmis (HGUDrB), and consisted on 4 controls (without the HD mutation) and 4 HD symptomatic patients, with equal representation of both sexes in each condition (2 women and 2 men) and balanced age. Human blood samples were collected in EDTA-K2 Vaccutainer tubes (BD) for isolation of peripheral blood mononuclear cells (PBMC) after a density gradient centrifugation using Pancoll human, 1.077 g/mL (PAN-Biotech) following this procedure: 1,300xg 15min, followed by a wash with 0.1M PBS 1,000xg 5min. Cells were immediately cryopreserved in two aliquotes per donor using the Demonstrated Protocol CG00039 RevD “Fresh Frozen Human PBMC for scRNA-seq” (10xGenomics).  For the first assay (SC1), we created two pools (CTRL and HD) from samples; briefly, an aliquot of each cryopreserved sample was thawed and washed following the Demonstrated Protocol CG00039 RevD “Fresh Frozen Human PBMC for scRNA-seq” (10xGenomics), and subsequently sorted in a FACSAria III (Becton Dickinson) to remove cell debris and platelets and to collect equal number of cellular events (~4,500). For the second assay (SC2), we repeated the same procedure with the same samples with the exception of including a prior labelling procedure for each individual sample using Cell Multiplexing Oligo (CMO) tags linked to cell-associated barcodes. Next, CTRL and HD pools were processed with the Chromium Next GEM Single Cell 3ʹ Reagent Kits v3.1 (Dual Index) protocol to obtain single cell barcodes. We followed the Chromium Next GEM Single Cell 3ʹ Reagent Kits v3.1 (Dual Index) protocol 