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Gene identification with sequenced T-DNA tags generated by transformation of Arabidopsis cell suspension.

A protocol for establishment and high-frequency Agrobacterium-mediated transformation of morphogenic Arabidopsis cell suspensions was developed to facilitate saturation mutagenesis and identification of plant genes by sequenced T-DNA tags. Thirty-two self-circularized T-DNA tagged chromosomal loci were isolated from 21 transgenic plants by plasmid rescue and long-range inverse polymerase chain reaction (LR-iPCR). By bidirectional sequencing of the ends of T-DNA-linked plant DNA segments, nine T-DNA inserts were thus localized in genes coding for the Arabidopsis ASK1 kinase, cyclin 3b, J-domain protein, farnesyl diphosphate synthase, ORF02, an unknown EST, and homologues of a copper amine oxidase, a peripheral Golgi protein and a maize pollen-specific transcript. In addition, 16 genes were identified in the vicinity of sequenced T-DNA tags illustrating the efficiency of genome analysis by insertional mutagenesis.