title: Tissue-preserving approach to extracting DNA from paraffin-embedded specimens using tissue microarray technology.
abstract: BACKGROUND
  DNA extracted from tumor cells or normal cells contained in formalin-fixed, paraffin-embedded tissues is widely used in many laboratories. The 2 most common procedures to isolate cells for DNA extraction from paraffin-embedded tissues are scalpel microdissection and laser capture microdissection. A new tissue- and time-conserving method for rapid DNA isolation from small cores taken from paraffin-embedded tissue blocks is described in this report.
  
  
  METHODS
  DNA was extracted from small tissue cores collected from paraffin-embedded tissue blocks at the time of tissue microarray construction. The quality and quantity of the DNA extracted was compared to DNA collected by scalpel microdissection. DNA collected from tissue cores was used in polymerase chain reaction (PCR) and loss of heterozygosity (LOH) analysis.
  
  
  RESULTS
  The quality and quantity of DNA obtained using tissue cores was comparable to DNA obtained by traditional methods. The tissue core method of DNA extraction preserves the tissue blocks from which the cores are extracted for future use. Adequate quantities of DNA can be successfully extracted from small segments of tissue cores and used for PCR. DNA isolated by tissue microdissection and the tissue core method were comparable when used to assess allelic heterozygosity on chromosome arm 18q.
  
  
  CONCLUSIONS
  The tissue core method of DNA isolation is reliable, tissue conserving, and time effective. Tissue cores for DNA extraction can be harvested at the same time as tissue microarray construction. The technique has the advantage of preserving the original tissue blocks for additional study as only tiny cores are removed.
authors.affiliation: Department of Otolaryngology-HNS, University of Michigan, 1500 E. Medical Center Drive, Ann Arbor, MI 48109, USA.
authors.forename: Mark E
authors.initials: ME
authors.lastname: Prince
authors.forename: Mathew L
authors.initials: ML
authors.lastname: Ubell
authors.forename: Jason
authors.initials: J
authors.lastname: Castro
authors.forename: Haruko
authors.initials: H
authors.lastname: Ogawa
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Ogawa
authors.forename: Ajita
authors.initials: A
authors.lastname: Narayan
authors.forename: Augusto
authors.initials: A
authors.lastname: Paulino
authors.forename: Andrew
authors.initials: A
authors.lastname: Cole
authors.forename: Gregory T
authors.initials: GT
authors.lastname: Wolf
authors.forename: Mark A
authors.initials: MA
authors.lastname: Rubin
authors.forename: Robert H
authors.initials: RH
authors.lastname: Lyons
authors.forename: Carol R
authors.initials: CR
authors.lastname: Bradford
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Carey
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000235:genetics / Q000473:pathology; D002887:Chromosomes, Human, Pair 18; D004273:DNA, Neoplasm / Q000302:isolation & purification*; D006801:Humans; D007822:Laryngeal Neoplasms / Q000235:genetics / Q000473:pathology; D019656:Loss of Heterozygosity; D042282:Microdissection; D016612:Paraffin Embedding; D016133:Polymerase Chain Reaction; D046888:Tissue Array Analysis
chemical_list: D004273:DNA, Neoplasm