GSM9080086: Patient_P4585_MM_Pre_Treatment; Homo sapiens; RNA-Seq
Primary CD138+ MM cells  were obtained from the BM aspirates of MM patients pre- and post- treatment with anti-GPRC5D T cell engagers treatment, using positive selection with CD138 microbeads (Miltenyi Biotech, Auburn, CA) and accordingly to manufacturer's instructions. Single-cell library preparation for RNA-sequencing primary MM CD138+ cells were processed according to 10X Genomics reagent Kits User Guide (CG00052 v2 Chemistry). Cells were partitioned into nanoliter-scale Gel Bead-In-Emulsions (GEMs) using 10X GemCode Technology. Primers containing (i) an Illumina R1 sequence, (ii) a 16 bp 10x barcode, (iii) a 10 bp Unique Molecular Identifier (UMI) and (iv) a poly-dT primer sequence were incubated with partitioned cells resulting in barcoded, full-length cDNA from poly-adenylated mRNA. Silane magnetic beads were used to remove leftover biochemical reagents/primers, then cDNA was amplified by PCR. Enzymatic Fragmentation and Size Selection was used to optimize cDNA amplicon size prior to library construction. R1 (read 1 primer sequence) were added during GEM incubation, whereas P5, P7, a sample index (i7), and R2 (read 2 primer sequence) were added during library construction via End Repair, A-tailing, Adaptor Ligation and PCR.