title: Enrichment for auxotrophic and heat-sensitive mutants of Neurospora crassa by tritium suicide.
abstract: Tritium suicide is shown to be an effective technique for mutant enrichment in Neurospora crassa. When mutagenized conidia were labelled to a high specific radioactivity either with a tritiated amino acid mixture or with [5-3H]uridine at a non-permissive temperature and stored at 4 degrees C to accumulate decays, there was a 13-15 fold enrichment for temperature-sensitive mutants relative to the original mutagenized cultures. For a wild type culture of Neurospora crassa labelled with [5-3H]uridine at 35 degrees C the probability of cell killing per tritium decay was calculated to be 3.64 X 10(-5).
mesh_terms: D004305:Dose-Response Relationship, Drug; D006358:Hot Temperature; D009154:Mutation; D009491:Neurospora / Q000528:radiation effects; D009492:Neurospora crassa / Q000528:radiation effects*; D011831:Radiation Genetics; D014316:Tritium; D014529:Uridine / Q000494:pharmacology
chemical_list: D014316:Tritium; D014529:Uridine