GSM6300486: Blood_Platelets_Vumc-HD-283-2-TR1875; Homo sapiens; RNA-Seq
Blood platelets were isolated from whole blood in purple-cap BD Vacutainers containing the EDTA anti-coagulant. The cells and aggregates were removed by centrifugation at room temperature for 20 minutes at 120g, resulting in platelet-rich plasma. The platelets were isolated from the platelet-rich plasma by centrifugation at room temperature for 20 minutes at 360g. The platelet pellet was collected in 30 μl RNAlater (Life Technologies), incubated overnight at 4°C and frozen at -80°C for further use. Frozen platelets were thawed on ice and total RNA was isolated using the mirVana RNA isolation kit (Life Technologies) according to the manufacturers' protocol. Complementary purification of small RNAs was included in the isolation procedure by addition of miRNA homogenate (Life Technologies). Total RNA was dissolved in 30 μl Elution Buffer (Life Technologies) and RNA quality and quantity was measured using Bioanalyzer 2100 with RNA 6000 Picochip (Agilent). 100-500 pg of platelet total RNA diluted in nuclease free H2O was subjected to cDNA synthesis and amplification using the SMARTer Ultra Low RNA Kit for Illumina Sequencing v3 (Clontech, cat. nr. 634853) according to the manufacturers' protocol. Conversion and efficient amplification of cDNA was quality-controlled using the Bioanalyzer 2100 with DNA High Sensitivity chip (Agilent). Samples with detectable fragments in the 300-7500 bp region were selected for further processing and Covaris shearing by sonication (Covaris Inc). Sample preparation for Illumina sequencing was performed using the Truseq DNA Sample Preparation Kit (Illumina, cat nr. FC-121-2001) or Truseq Nano DNA Sample Preparation Kit (Illumina, cat nr. FC-121-4001). Sample quality and quantity was measured using the DNA 7500 chip or DNA High Sensitivity chip (Agilent). High-quality samples with product sizes between 300-500 bp were pooled in equimolar concentrations and submitted for 100 bp Single Read sequencing on the Hiseq 2500 or 4000 platform (Illumina).