Methods for producing a complex transgenic trait locus
Methods for producing in a plant a complex transgenic trait locus comprising at least two altered target sequences in a genomic region of interest are disclosed. The methods involve the use of two or more double-strand-break-inducing agents, each of which can cause a double-strand break in a target sequence in the genomic region of interest which results in an alteration in the target sequence. Also disclosed are complex transgenic trait loci in plants. A complex transgenic trait locus comprises at least two altered target sequences that are genetically linked to a polynucleotide of interest. Plants, plant cells, plant parts, and seeds comprising one or more complex transgenic trait loci are also disclosed.
1. A method to produce a maize plant comprising a complex transgenic trait locus in the maize plant, the trait locus comprising at least first and second altered target sequences, wherein the first altered target sequence originated from a first endogenous target sequence that is recognized and cleaved by a first engineered double-strand-break-inducing agent and the second altered target sequence originated from a second endogenous target sequence that is recognized and cleaved by a second engineered double-strand-break-inducing agent, wherein each of said altered target sequences differ from their corresponding endogenous target sequence, wherein the first and second endogenous target sequences are located on the same arm of the same chromosome, wherein each of the alterations comprises a heterologous polynucleotide, and wherein at least one of the engineered doubled-strand-break-inducing agents cleaves SEQ ID NO:75.
2. The method of claim 1 , wherein the heterologous polynucleotide is selected from the group consisting of: DNA for gene silencing, DNA encoding a phenotypic marker, and DNA encoding a protein providing an agronomic advantage.
3. The method of claim 1 , the method comprising obtaining a seed from the maize plant comprising said complex transgenic trait locus of claim 1 .