title: Analysis of LINE-1 Retrotransposition at the Single Nucleus Level.
abstract: Long interspersed nuclear element-1 (Line-1 or L1) accounts for approximately 17% of the DNA present in the human genome. While the majority of L1s are inactive due to 5' truncations, ~80-100 of these elements remain retrotransposition competent and propagate to different locations throughout the genome via RNA intermediates. While older L1s are believed to target AT rich regions of the genome, the chromosomal targets of newer, more active L1s remain poorly defined. Here we describe fluorescence in situ hybridization (FISH) methodology that can be used to track patterns of L1 insertion and rates of ectopic L1 incorporation at the single nucleus level. In these experiments, fluorescein isothiocyanate/cyanine-3 (FITC/CY3) labeled neomycin probes were employed to track L1 retrotransposition in vitro in HepG2 cells stably expressing ectopic L1. This methodology prevents errors in the estimation of rates of retrotransposition posed by toxicity and account for the occurrence of multiple insertions into a single nucleus.
authors.affiliation: Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, University of Arizona College of Medicine; pbojang@email.arizona.edu.
authors.forename: Pasano
authors.initials: P
authors.lastname: Bojang
authors.affiliation: Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, University of Arizona College of Medicine; Center for Applied Genetics and Genomic Medicine, University of Arizona College of Medicine; ksramos@email.arizona.edu.
authors.forename: Kenneth S
authors.initials: KS
authors.lastname: Ramos
mesh_terms: D002467:Cell Nucleus / Q000235:genetics*; D004247:DNA / Q000235:genetics; D015894:Genome, Human; D056945:Hep G2 Cells; D006801:Humans; D017404:In Situ Hybridization, Fluorescence / Q000379:methods; D020084:Long Interspersed Nucleotide Elements
chemical_list: D004247:DNA