
Nonradioactive Labeling of Large DNA Fragments for Genome Walking, RFLP and Northern Blot Analysis
Author(s) -
Farzaneh Adhami,
Sabine Müller,
Marie-Therès Hauser
Publication year - 1999
Publication title -
biotechniques/biotechniques
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.617
H-Index - 131
eISSN - 1940-9818
pISSN - 0736-6205
DOI - 10.2144/99272st02
Subject(s) - southern blot , dna , nucleic acid , microbiology and biotechnology , digoxigenin , biology , genomic dna , dot blot , hybridization probe , nucleic acid thermodynamics , genome , gene , chemistry , biochemistry , rna , messenger rna , in situ hybridization
In this report, we present a simple nonradioactive labeling procedure for DNA fragments of high specific labeling density that can be used for a variety of applications. The protocol is based on the universal mono-functional platinium reagent for chemical digoxigenin (DIG) labeling of nucleic acids. The labeling protocol was optimized for large DNA templates as complete bacterial artificial chromosomes (BAC). Variations of incubation time and temperature improved the labeling density such that about 30% of the nucleotides were DIGmodified within 30 min. Furthermore, the refined procedure generates in a single-tube reaction and without prior digestion-labeled DNA fragments of 0.5—4.0 kb from a 130-kb template. Hybridization experiments were performed on Southern and northern blots and allowed the detection of single copy genes in 2.5 mg genomic DNA from Arabidopsis thaliana, which has a haploid genome size of 0.13 pg (ca. 120 Mb) and medium expressed transcripts from 0.8 ìg poly(A) + RNA, respectively. The extremely high specific labeling density, the stability and the universal application of the probe generated with the platinium reagent makes this method a useful alternative to classical radioactive nuclei acids labeling techniques.