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1 Gene therapy uses sections of DNA (usually genes) to treat or prevent disease. 2  The DNA is carefully selected to correct the effect of a mutated gene that is causing disease.3  The technique was first developed in 1972 but has, so far, had limited success in treating human diseases. A section of DNA/gene containing instructions for making a useful protein is packaged within a vector, usually a virus, bacterium or plasmid. 2  The vector acts as a vehicle to carry the new DNA into the cells of a patient with a genetic disease.
Therefore, Cis-gene is gene (part of DNA or RNA) which regulate (means control) the expression (means function) of genes which are on same DNA (on which cis gene itself is located) and cannot control genes expresion of genes which are on another DNA (which is another concept known as trans gene regulation).hese genes are adjacent to each other (hint: means on same part of its own DNA-Cis gene) and has single point control (so called as operon) These are called as lacZ, lac Y and lac A respectively & together constitutes lac operon (Cis-gene).