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Genetics, Vol 132, 553-566, Copyright © 1992
INVESTIGATIONS |
Somatic and Germinal Recombination of a Direct Repeat in Arabidopsis
F. F. Assaad and E. R. Signer
Present address: University of Munich, Institute of Genetics and Microbiology, Maria-Ward Strasse 1A, D-8000 Munich 19, Germany.
Homologous recombination between a pair of directly repeated transgenes was studied in Arabidopsis. The test construct included two different internal, non-overlapping deletion alleles of npt (neomycin phosphotransferase) flanking an active HPT (hygromycin phosphotransferase) gene. This construct was introduced into Arabidopsis by agrobacterium-mediated transformation with selection for resistance to hygromycin, and two independent single-insert lines were analyzed. Selection for active NPT by resistance to kanamycin gave both fully and partly (chimeric) recombinant seedlings. Rates for one transgenic line were estimated at <2 X 10(-5) events per division for germinal and >10(-6) events per division for somatic recombination, a much smaller difference than between meiotic and mitotic recombination in yeast. Southern analysis showed that recombinants could be formed by either crossing over or gene conversion. A surprisingly high fraction (at least 2/17) of the recombinants, however, appeared to result from the concerted action of two or more independent simple events. Some evolutionary implications are discussed.
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