title: Evaluation of DNA extraction from granulocytes discarded in the separation medium after isolation of peripheral blood mononuclear cells and plasma from whole blood.
abstract: BACKGROUND
  Whole blood is generally processed for plasma and peripheral blood mononuclear cells (PBMCs) from granulocytes/erythrocytes using gradient centrifugation of blood with Histopaue-Ficoll. After separation of plasma and PBMCs, the residual erythrocytes/granulocytes, a rich source of DNA, is often discarded along with the separation medium. In order to isolate DNA from the granulocytes, current methods require the removal of the separation medium and subsequent purification of granulocytes. This report provides a method for extracting DNA using the PAXgene Blood DNA kit from granulocytes without purifying them from the separation medium.
  
  
  RESULTS
  Based on 719 erythrocyte/granulocyte samples stored frozen for approximately 10 years in Ficoll-Hypaque separation medium, the mean yield of DNA was 395 μg (median = 281 μg; range = 1.36 to 2077.2 μg), with mean A260/A280 ratio of 1.84 (median = 1.84; range = 1.17 to 2.23). The quality of isolated DNA was sufficient for use as a template for restriction enzyme digestion, real-time PCR, pyrosequencing, and gel based variable number tandem repeats (VNTR) genotyping.
  
  
  CONCLUSIONS
  By demonstrating the extraction of substantial amounts of high quality granulocytes DNA without purifying them from the separation medium, this method offers laboratories and biobanks a flexible and cost-effective approach to obtain plasma, PBMCs, and large amounts of DNA from a single blood collection for a variety of molecular genetics/epidemiologic studies.
authors.forename: Janná R
authors.initials: JR
authors.lastname: Murray
authors.affiliation: Division of High-Consequence Pathogens and Pathology, Centers for Disease Control & Prevention, 1600 Clifton Rd Mailstop G41, Atlanta, GA 30333, USA. mor4@cdc.gov.
authors.forename: Mangalathu S
authors.initials: MS
authors.lastname: Rajeevan
mesh_terms: D002469:Cell Separation; D002498:Centrifugation; D004247:DNA / Q000235:genetics / Q000302:isolation & purification*; D060005:Genotyping Techniques; D006098:Granulocytes / Q000737:chemistry* / Q000166:cytology; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000166:cytology; D018598:Minisatellite Repeats; D011933:Reagent Kits, Diagnostic; D060888:Real-Time Polymerase Chain Reaction; D015183:Restriction Mapping; D017422:Sequence Analysis, DNA
chemical_list: D011933:Reagent Kits, Diagnostic; D004247:DNA