PMID- 17703973 OWN - NLM STAT- MEDLINE DCOM- 20080306 LR - 20240104 IS - 1096-0937 (Electronic) IS - 1087-1845 (Linking) VI - 45 IP - 3 DP - 2008 Mar TI - Transient disruption of non-homologous end-joining facilitates targeted genome manipulations in the filamentous fungus Aspergillus nidulans. PG - 165-70 AB - We have developed a transiently disrupted nkuA system in Aspergillus nidulans for efficient gene targeting. The nkuA disruption was made by inserting a counter-selectable marker flanked by a direct repeat (DR) composed of nkuA sequences. In the disrupted state, the non-homologous end-joining (NHEJ) activity is abolished and gene targeting can be performed with success rates identical to those obtained with permanent nkuA knock-out strains. When gene targeting is complete, the functional nkuA allele can be re-established via a simple selection step, thereby eliminating the risk that defective NHEJ influences subsequent analyses of the manipulated strain. Our system will facilitate construction of large numbers of defined mutations in A. nidulans. Moreover, as the system can likely be adapted to other filamentous fungi, we expect it will be particularly beneficial in species where NHEJ cannot be restored by sexual crossing. FAU - Nielsen, Jakob B AU - Nielsen JB AD - Center for Microbial Biotechnology, BioCentrum-DTU, Technical University of Denmark, Building 223, DK-2800 Kgs. Lyngby, Denmark. FAU - Nielsen, Michael L AU - Nielsen ML FAU - Mortensen, Uffe H AU - Mortensen UH LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20070720 PL - United States TA - Fungal Genet Biol JT - Fungal genetics and biology : FG & B JID - 9607601 SB - IM MH - Aspergillus nidulans/*genetics MH - Blotting, Southern MH - Fungi/*genetics MH - Gene Targeting/methods MH - Genes, Fungal/*genetics MH - Genetic Vectors/genetics MH - *Genome, Fungal MH - Mutation MH - Polymerase Chain Reaction MH - Recombination, Genetic MH - Transformation, Genetic EDAT- 2007/08/21 09:00 MHDA- 2008/03/07 09:00 CRDT- 2007/08/21 09:00 PHST- 2007/05/24 00:00 [received] PHST- 2007/06/15 00:00 [revised] PHST- 2007/07/09 00:00 [accepted] PHST- 2007/08/21 09:00 [pubmed] PHST- 2008/03/07 09:00 [medline] PHST- 2007/08/21 09:00 [entrez] AID - S1087-1845(07)00120-X [pii] AID - 10.1016/j.fgb.2007.07.003 [doi] PST - ppublish SO - Fungal Genet Biol. 2008 Mar;45(3):165-70. doi: 10.1016/j.fgb.2007.07.003. Epub 2007 Jul 20.